{"title":"Boat Electrical \u0026 Power Systems","description":"\u003cp\u003eEverything between the charge source and the load: what stores the energy, what generates it, and what spends it. A DC bank is the one system aboard that is expensive to get wrong and impossible to judge by eye.\u003c\/p\u003e\u003cp\u003eEach record works the same way. You transcribe the figures for your own installation — your cell manufacturer's charge voltages and cutoffs, your BMS thresholds, your panel's temperature coefficient — onto a reference page, once. From then on, every reading you log is measured against your own equipment rather than against a number written for somebody else's boat.\u003c\/p\u003e\u003cp\u003eNone of these documents publishes a voltage, a current or a limit of its own, and none instructs you to fit a fuse, size a cable or program a battery management system. Those decisions belong to a qualified marine electrician. These records capture what was fitted, what it was set to, what it measured on day one, and how far it has drifted since.\u003c\/p\u003e","products":[{"product_id":"lithium-dc-system-record-pdf","title":"Lithium \u0026 DC System Record PDF — Configuration, Commissioning \u0026 Cell Balance Log","description":"\u003cp style=\"font-size:1.05em;line-height:1.7;\"\u003e\u003cstrong\u003eThe cell spread is the most useful number in a lithium bank, and no dashboard shows it to you.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eYour monitor shows a state of charge and a pack voltage. Both look healthy right up to the day one cell runs away from the others and the BMS starts disconnecting under load. The gap between your highest and lowest cell, read at the top of a charge where imbalance is widest, is what tells you that months in advance.\u003c\/p\u003e\n\n\u003cp\u003eThis record holds that number over time, alongside the configuration it belongs to: what cells, what BMS, what fuse, what each charge source is actually set to, and who signed the installation off.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#0A3F5C;border-left:4px solid #C5A059;border-radius:4px;padding:22px 24px;margin:26px 0;color:#F7F9FA;\"\u003e\n  \u003cp style=\"margin:0 0 4px;font-size:0.72em;letter-spacing:0.14em;text-transform:uppercase;color:#C5A059;font-weight:700;\"\u003eWhat you receive\u003c\/p\u003e\n  \u003cp style=\"margin:0 0 14px;font-size:1.25em;line-height:1.35;color:#FFFFFF;\"\u003eA seven-part record for the life of the bank\u003c\/p\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;color:#DCE6EC;\"\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 24-line reference page\u003c\/strong\u003e for the cell, BMS, charger and inverter figures you transcribe, with the source and page beside each\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 20-line as-installed record\u003c\/strong\u003e — fuse, disconnect, cable sizes, sensor positions, and what every charge source is actually set to\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003ePer-cell commissioning readings\u003c\/strong\u003e for up to sixteen cells in series, with the meter recorded\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e16 balance entries\u003c\/strong\u003e tracking cell spread, pack-versus-sum and temperature over time\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA BMS event register\u003c\/strong\u003e including the warnings that cleared themselves\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e6 calculation models\u003c\/strong\u003e for spread, connection loss, deviation, surge sizing, delivered capacity and equivalent cycles\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eThe gap between the drawing and the boat\u003c\/h3\u003e\n\u003cp\u003ePart I is what your documentation says. Part II is what is actually fitted — the fuse body you read with a torch, the cable marking, the charger set point measured at the terminals rather than assumed from the menu. Most lithium problems live in the gap between those two pages, and nobody writes either of them down.\u003c\/p\u003e\n\u003cp\u003eModel E2 is the sleeper in this record: pack voltage minus the sum of the cells. A discrepancy there is not a battery problem at all. It is a connection problem, and it is measuring the resistance of a joint that is about to get hot.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#F7F9FA;border:1px solid #E1E8EC;border-left:4px solid #A2803C;border-radius:4px;padding:20px 22px;margin:26px 0;\"\u003e\n  \u003cp style=\"margin:0 0 6px;color:#0A3F5C;font-weight:700;\"\u003eNot one published voltage. Deliberately.\u003c\/p\u003e\n  \u003cp style=\"margin:0;line-height:1.7;\"\u003eCell voltages, charge currents, balance thresholds and temperature cutoffs differ by chemistry, by cell maker, by BMS and by firmware revision. A charge voltage that is correct for one cell will damage another. A low-temperature lockout that is right for one chemistry permanently plates lithium onto the anodes of the next. So this record publishes none of them — you transcribe yours once, from the documentation that came with your own cells.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eInstallation is qualified work. This is a record of it.\u003c\/h3\u003e\n\u003cp\u003eNo page here tells you to fit a fuse, torque a busbar, program a BMS, size a cable or wire a charge source. High-current DC work on a boat is governed by standards, it belongs to a qualified marine electrician, and a lithium bank is the one system aboard that can take the whole boat with it.\u003c\/p\u003e\n\u003cp\u003ePart VI is sixteen lines recording that a competent person verified the installation — and who that person was, with their qualification and the date. Those are questions to put to your electrician, not a checklist for a Saturday afternoon.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWho it is for\u003c\/h3\u003e\n\u003cul style=\"line-height:1.75;\"\u003e\n  \u003cli\u003eOwners who have just had a lithium bank fitted and want it documented while it is fresh\u003c\/li\u003e\n  \u003cli\u003eOwners who inherited one with no paperwork and need to establish what is actually installed\u003c\/li\u003e\n  \u003cli\u003eAnyone whose insurer or surveyor has asked questions about a lithium installation\u003c\/li\u003e\n  \u003cli\u003eOwners preparing to sell, where an undocumented lithium bank is a discount waiting to happen\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;margin:12px 0 4px;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;width:42%;\"\u003eProduct ID\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAML-ELEC-2026-01\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eExtent\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e24 pages · 7 parts · 6 calculation models\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eRegister lines\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e104 across reference, as-installed, commissioning, trend and verification\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eInteractivity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e543 live PDF form fields — 60 tick boxes and 483 entry fields\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eFormats included\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eA4 and US Letter, both fillable and print-ready\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eSystems\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAny chemistry, up to 16 cells in series — no chemistry-specific data\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eUnits\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eUnit-neutral — you set them and record which you used\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eOffline\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eNo app, no account, no connection required once downloaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWhat it is not\u003c\/h3\u003e\n\u003cp\u003eThis document records, structures and compares figures that you supply. It publishes no voltage, no current limit, no temperature cutoff, no fuse rating and no torque figure, and it reaches no conclusion about any installation. It is not a wiring guide, not an integration manual and not engineering advice.\u003c\/p\u003e\n\u003cp\u003eThose decisions belong to a qualified marine electrician working to the standards that apply where your vessel is flagged and used, and to the documentation supplied with your own cells. A lithium installation that is wrong does not fail gracefully.\u003c\/p\u003e\n\n\u003cp style=\"margin-top:26px;\"\u003e\u003cstrong style=\"color:#0A3F5C;\"\u003eInstant download.\u003c\/strong\u003e Your links appear on screen the moment payment clears, and arrive by email within a minute. They do not expire.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#5C6B75;line-height:1.65;margin-top:22px;border-top:1px solid #E1E8EC;padding-top:16px;\"\u003e\u003cem\u003e2026 Captain's Edition · Revision 1.0 · AML-ELEC-2026-01. Apex Marine Labs designs the organisational process behind good seamanship. Our documents record and organise; they do not replace a certified marine survey, an installation standard, or a qualified marine electrician.\u003c\/em\u003e\u003c\/p\u003e","brand":"Apex Marine Labs","offers":[{"title":"2026 Captain's Edition","offer_id":56014210236584,"sku":"AML-ELEC-2026-01","price":97.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/1161\/2072\/files\/apex-lithium-dc-record-01-cover.webp?v=1789749512"},{"product_id":"solar-hydro-yield-record-pdf","title":"Solar \u0026 Hydro Yield Record PDF — Array Configuration, Shading Survey \u0026 Output Log","description":"\u003cp style=\"font-size:1.05em;line-height:1.7;\"\u003e\u003cstrong\u003eThe dangerous number in a solar installation is voltage on a cold morning — not current in the heat.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003ePanel voltage rises as temperature falls. The worst case a charge controller ever sees is a bright, still, freezing morning at the start of a season, and it is precisely the morning nobody is thinking about the array. Exceed the controller's input limit once and the unit is finished.\u003c\/p\u003e\n\n\u003cp\u003eModel Y1 computes that figure from your own panel's temperature coefficient, so you can compare it against your own controller's limit. This record states neither — a coefficient taken from the wrong datasheet is worse than no calculation at all.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#0A3F5C;border-left:4px solid #C5A059;border-radius:4px;padding:22px 24px;margin:26px 0;color:#F7F9FA;\"\u003e\n  \u003cp style=\"margin:0 0 4px;font-size:0.72em;letter-spacing:0.14em;text-transform:uppercase;color:#C5A059;font-weight:700;\"\u003eWhat you receive\u003c\/p\u003e\n  \u003cp style=\"margin:0 0 14px;font-size:1.25em;line-height:1.35;color:#FFFFFF;\"\u003eA seven-part record for the life of the array\u003c\/p\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;color:#DCE6EC;\"\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 24-line reference page\u003c\/strong\u003e for the ratings, coefficients and limits you transcribe from your own panel, controller and generator datasheets\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eAn 18-line as-installed record\u003c\/strong\u003e — strings, tilt, fusing, cable runs, connectors, controller position and ventilation\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 10-observation shading survey\u003c\/strong\u003e across one clear day: what casts the shadow, which panels it covers, and what the output did\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003ePer-string commissioning readings\u003c\/strong\u003e with cell temperature recorded, because one weak string averaged into a healthy array is the fault this page exists to catch\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e24 monthly yield entries\u003c\/strong\u003e — two full seasons of generation beside consumption — and a 12-run hydro log\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e6 calculation models\u003c\/strong\u003e for cold-morning voltage, output ratio, baseline deviation, specific yield, your own hydro constant and passage coverage\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eA shadow the size of a halyard\u003c\/h3\u003e\n\u003cp\u003eDepending on how the panels are wired and what bypass diodes are fitted, one shaded cell can take a whole string with it. The shading survey is a single day of attention — four or five observations between morning and evening, each one photographed — and it explains years of readings that otherwise look like bad luck.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#F7F9FA;border:1px solid #E1E8EC;border-left:4px solid #A2803C;border-radius:4px;padding:20px 22px;margin:26px 0;\"\u003e\n  \u003cp style=\"margin:0 0 6px;color:#0A3F5C;font-weight:700;\"\u003eNot one published output figure. Deliberately.\u003c\/p\u003e\n  \u003cp style=\"margin:0;line-height:1.7;\"\u003ePanel ratings, temperature coefficients, controller limits and expected yield differ by make, by model and by production year — and what an array actually produces further depends on your latitude, your season, your tilt and the shadow your own bimini casts at four in the afternoon. Every figure is on the datasheet that came with your hardware. You transcribe it once; the document does the arithmetic.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eA hydro curve nobody else has\u003c\/h3\u003e\n\u003cp\u003eHydro output rises roughly with the cube of speed, so half a knot matters far more than it feels like it should. Model Y5 derives the constant for \u003cem\u003eyour\u003c\/em\u003e turbine, with \u003cem\u003eyour\u003c\/em\u003e propeller, at \u003cem\u003eyour\u003c\/em\u003e tow depth, behind \u003cem\u003eyour\u003c\/em\u003e hull. Three runs at different speeds and you have a generator curve that exists nowhere else — and a realistic answer to what a night watch actually costs you.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eSpecific yield is the figure that ends arguments\u003c\/h3\u003e\n\u003cp\u003eKilowatt-hours per rated kilowatt is the only measure that lets you compare your array against a bigger one, against last summer, or against a chandler's claim about what a fourth panel will add. Model Y4 gives it to you in one division, and the 24-month log gives you two seasons of it.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eInstallation is qualified work. This is a record of it.\u003c\/h3\u003e\n\u003cp\u003eNo page here tells you to fit a fuse, size a cable, wire a string, program a controller or mount a generator. Part VI is fourteen lines recording that a competent person verified the installation — with their qualification and the date. Those are questions to put to your electrician, not a checklist for a Saturday afternoon.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWho it is for\u003c\/h3\u003e\n\u003cul style=\"line-height:1.75;\"\u003e\n  \u003cli\u003eOwners who have just had an array fitted and want it documented while the datasheets are still to hand\u003c\/li\u003e\n  \u003cli\u003eOwners considering more panels who want the actual numbers before spending\u003c\/li\u003e\n  \u003cli\u003eLiveaboards and long-distance cruisers deciding whether the installation meets the way they sail\u003c\/li\u003e\n  \u003cli\u003eAnyone whose controller has failed once and who does not know why\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eHow it relates to the Lithium \u0026amp; DC System Record\u003c\/h3\u003e\n\u003cp\u003eThe Lithium record covers what stores the energy and how the bank is ageing. This one covers what generates it and whether there is enough. Together they are the complete paper history of a modern DC installation — the one system aboard a surveyor cannot assess from an afternoon's inspection.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;margin:12px 0 4px;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;width:42%;\"\u003eProduct ID\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAML-ELEC-2026-02\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eExtent\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e25 pages · 7 parts · 6 calculation models\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eRegister lines\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e196 across reference, as-installed, shading, strings, yield and hydro\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eInteractivity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e746 live PDF form fields — 56 tick boxes and 690 entry fields\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eFormats included\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eA4 and US Letter, both fillable and print-ready, 25 pages each\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eSystems\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAny panel, any controller, up to 8 strings — no hardware-specific data\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eUnits\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eUnit-neutral — you set them and record which you used\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eOffline\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eNo app, no account, no connection required once downloaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWhat it is not\u003c\/h3\u003e\n\u003cp\u003eThis document records, structures and compares figures that you supply. It publishes no panel rating, no temperature coefficient, no controller limit and no expected yield, and it reaches no conclusion about any installation.\u003c\/p\u003e\n\u003cp\u003eModel Y1 is a calculation performed on figures you supply; it is not a determination that any installation is safe. Array and charge-controller work belongs to a qualified marine electrician working to the standards that apply where your vessel is flagged and used.\u003c\/p\u003e\n\n\u003cp style=\"margin-top:26px;\"\u003e\u003cstrong style=\"color:#0A3F5C;\"\u003eInstant download.\u003c\/strong\u003e Your links appear on screen the moment payment clears, and arrive by email within a minute. They do not expire.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#5C6B75;line-height:1.65;margin-top:22px;border-top:1px solid #E1E8EC;padding-top:16px;\"\u003e\u003cem\u003e2026 Captain's Edition · Revision 1.0 · AML-ELEC-2026-02. Apex Marine Labs designs the organisational process behind good seamanship. Our documents record and organise; they do not replace a certified marine survey, an installation standard, or a qualified marine electrician.\u003c\/em\u003e\u003c\/p\u003e","brand":"Apex Marine Labs","offers":[{"title":"Default Title","offer_id":56016711221416,"sku":"AML-ELEC-2026-02","price":97.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/1161\/2072\/files\/apex-solar-hydro-yield-01-cover.webp?v=1789773720"},{"product_id":"12v-load-energy-budget-worksheet-pdf","title":"12V Load \u0026 Energy Budget Worksheet PDF — Measured Draw, Duty by Regime \u0026 Autonomy","description":"\u003cp style=\"font-size:1.05em;line-height:1.7;\"\u003e\u003cstrong\u003eThe figure on the data plate and the figure on the shunt are not the same number — and the difference is never in your favour.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe plate figure was measured on a new unit, at a bench voltage, in a laboratory. Yours is ten years old, at the end of a long cable run, through a connection that is not what it was. Across twenty loads that gap is the difference between a bank that lasts three days and one that lasts one.\u003c\/p\u003e\n\n\u003cp\u003eEvery load in this worksheet has a column for what the appliance claims and a column for what it actually drew. It is the single column nobody fills in, and it is why most energy budgets are optimistic fiction.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#0A3F5C;border-left:4px solid #C5A059;border-radius:4px;padding:22px 24px;margin:26px 0;color:#F7F9FA;\"\u003e\n  \u003cp style=\"margin:0 0 4px;font-size:0.72em;letter-spacing:0.14em;text-transform:uppercase;color:#C5A059;font-weight:700;\"\u003eWhat you receive\u003c\/p\u003e\n  \u003cp style=\"margin:0 0 14px;font-size:1.25em;line-height:1.35;color:#FFFFFF;\"\u003eA seven-part worksheet built on measurement\u003c\/p\u003e\n  \u003cul style=\"margin:0;padding-left:18px;line-height:1.75;color:#DCE6EC;\"\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 24-line reference page\u003c\/strong\u003e for the figures you transcribe from your own cells, monitor, inverter and data plates — including usable capacity, which is not rated capacity\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e28 loads measured at the shunt\u003c\/strong\u003e, plate figure beside measured figure, with the gap computed per load\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eA 16-session measurement register\u003c\/strong\u003e recording ambient temperature and bank state, because two readings without them are not comparable\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003eThe same 28 loads across four usage regimes\u003c\/strong\u003e — at sea, at anchor, in harbour, laid up — with a daily total and an autonomy figure for each\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e14 logged days\u003c\/strong\u003e comparing what actually happened against what the budget predicted\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong style=\"color:#FFFFFF;\"\u003e6 calculation models\u003c\/strong\u003e and a parasitic draw register for everything still live with the boat switched off\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eFour regimes, not one average\u003c\/h3\u003e\n\u003cp\u003eA fridge at anchor in thirty degrees and the same fridge under way on a cool passage are different appliances. A single averaged consumption figure is what makes people buy the wrong bank — too small for the Mediterranean in August, too large for a boat that mostly sits on a mooring.\u003c\/p\u003e\n\u003cp\u003eThis worksheet gives you four columns and four autonomy figures. The laid-up column is the one that surprises people: three weeks on a mooring with a bilge float, an alarm and an inverter on standby will flatten a bank that seemed generous all summer. Model B6 exists for exactly that.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#F7F9FA;border:1px solid #E1E8EC;border-left:4px solid #A2803C;border-radius:4px;padding:20px 22px;margin:26px 0;\"\u003e\n  \u003cp style=\"margin:0 0 6px;color:#0A3F5C;font-weight:700;\"\u003eNot one published consumption figure. Deliberately.\u003c\/p\u003e\n  \u003cp style=\"margin:0;line-height:1.7;\"\u003eA table of typical draws copied from a forum is the single commonest reason an energy budget turns out wrong. Appliances differ by make, by age, by how they are installed and by how their owner uses them. You measure yours once, at your own shunt, and every calculation afterwards rests on your own boat.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eHours, not switch positions\u003c\/h3\u003e\n\u003cp\u003eThe trap in an energy budget is never the current — it is the hours. A fridge is not on for twenty-four hours; it cycles, and the honest figure is total running time over a day. A windlass draws an enormous current for ninety seconds, which looks catastrophic expressed hourly and is a rounding error expressed per anchoring. The worksheet is built around getting that column right.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eFourteen days that test the arithmetic\u003c\/h3\u003e\n\u003cp\u003ePart IV logs real days against the predicted figures. A budget that survives contact with fourteen days is a budget; anything else is arithmetic. And where the two diverge, the fault is almost always in the hours rather than the current — which is worth knowing before you spend four figures on more battery.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eHow it completes the Electrical \u0026amp; Power set\u003c\/h3\u003e\n\u003cp\u003eThe Lithium \u0026amp; DC System Record covers what stores the energy. The Solar \u0026amp; Hydro Yield Record covers what generates it. This one covers what spends it — and model B5 turns the whole thing into the one number that decides how you live aboard: engine hours per day.\u003c\/p\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWho it is for\u003c\/h3\u003e\n\u003cul style=\"line-height:1.75;\"\u003e\n  \u003cli\u003eOwners sizing a new bank, or being quoted for one, who want measurements rather than assumptions\u003c\/li\u003e\n  \u003cli\u003eLiveaboards and long-distance cruisers planning for passages rather than weekends\u003c\/li\u003e\n  \u003cli\u003eAnyone whose batteries are flat after a few weeks away and who does not know what did it\u003c\/li\u003e\n  \u003cli\u003eOwners adding a watermaker, a freezer or air conditioning who need the real cost first\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eTechnical specification\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.95em;margin:12px 0 4px;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;width:42%;\"\u003eProduct ID\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eAML-ELEC-2026-03\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eExtent\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e23 pages · 7 parts · 6 calculation models\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eRegister lines\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e180 across reference, measurement, regimes, observation and verification\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eInteractivity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e780 live PDF form fields — 38 tick boxes and 742 entry fields\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eFormats included\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eA4 and US Letter, both fillable and print-ready, 23 pages each\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eSystems\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003e12V or 24V, any chemistry, up to 28 loads — four lines unlabelled\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eRequires\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eA battery monitor with a shunt — the measurements depend on it\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;color:#0A3F5C;font-weight:600;\"\u003eOffline\u003c\/td\u003e\n\u003ctd style=\"padding:9px 0;border-bottom:1px solid #E1E8EC;\"\u003eNo app, no account, no connection required once downloaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"color:#0A3F5C;margin:30px 0 8px;\"\u003eWhat it is not\u003c\/h3\u003e\n\u003cp\u003eThis worksheet records, structures and compares figures that you supply. It publishes no current draw, no duty cycle, no depth of discharge and no consumption figure, and it reaches no conclusion about any installation.\u003c\/p\u003e\n\u003cp\u003eSizing a battery bank, a charge source or a circuit is qualified work. An autonomy figure computed here is an estimate built on your own measurements — not an assurance that any bank will last any particular length of time at sea.\u003c\/p\u003e\n\n\u003cp style=\"margin-top:26px;\"\u003e\u003cstrong style=\"color:#0A3F5C;\"\u003eInstant download.\u003c\/strong\u003e Your links appear on screen the moment payment clears, and arrive by email within a minute. They do not expire.\u003c\/p\u003e\n\n\u003cp style=\"font-size:0.9em;color:#5C6B75;line-height:1.65;margin-top:22px;border-top:1px solid #E1E8EC;padding-top:16px;\"\u003e\u003cem\u003e2026 Captain's Edition · Revision 1.0 · AML-ELEC-2026-03. Apex Marine Labs designs the organisational process behind good seamanship. Our documents record and organise; they do not replace a certified marine survey, an installation standard, or a qualified marine electrician.\u003c\/em\u003e\u003c\/p\u003e","brand":"Apex Marine Labs","offers":[{"title":"Default Title","offer_id":56016819159208,"sku":"AML-ELEC-2026-03","price":97.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/1161\/2072\/files\/apex-12v-energy-budget-01-cover_3b6b1f1a-ea9a-46c1-86f8-30646fc3b2f5.webp?v=1789774925"}],"url":"https:\/\/apexmarinelabs.com\/collections\/boat-electrical-power.oembed","provider":"Apex Marine Labs","version":"1.0","type":"link"}