12V · marine
Submersible LiFePO4: size the load, then the voltage
People land on a Submersible page because the last bank died early or would not charge. Underwater vehicle power. We start from load, charger, and temperature — then cells.
CAGE 93CZ2
UN38.3 transport docs on request. DUNS 109774429. We do not publish a star rating we cannot source.
This rail: House banks, Group 24/27/31 drop-ins, small inverters
Typical size: Typical 100–400Ah; parallel for more
What actually fails
- A house bank that sags when the inverter kicks the microwave is how weekends get cut short.
- Weight in the stern changes how the boat sits. Lead is a trim problem as much as an electrical one.
How we quote it
- Specify sealed terminals and a case you can actually rinse. IP-rated hardware is the marine line item, not a logo.
- Size usable kWh at 80% depth of discharge, not the sticker Ah on a wet cell you would never empty.
12V on this URL
Sensible up to roughly 2 kW continuous inverter load. After that, step up voltage or parallel with thicker cable.
If you delete the voltage, the Submersible constraints above should still make sense. That is the point.
What to spec for Submersible
Underwater vehicle power If the locker floods, the BMS board is the part that dies first. Ask for conformal coat and sealed glands, not just “marine grade” on a brochure. Voltage overlay on this URL is only there because the equipment rail is real — delete the voltage and the duty-cycle advice should still read as a sentence. Sensible up to roughly 2 kW continuous inverter load. After that, step up voltage or parallel with thicker cable.
12V catalog SKUs
12V 100AH Lithium Ion Battery
100AH
$1,499 listed
12V 10A Lithium Battery Charger
10A
$299 listed
12 Volt Lithium Batteries
12V
$999 listed
Prices are catalog list from our product file. Custom packs are quoted.
Spec note
If the locker floods, the BMS board is the part that dies first. Ask for conformal coat and sealed glands, not just “marine grade” on a brochure.
Questions we actually get
How do I size a Submersible lithium bank?
Start from the load you cannot lose. Everything else is optional capacity. We will convert that into Ah at the voltage you already have.
Can I keep my existing charger?
If it can hold a lithium charge curve (higher absorb, little or no float), maybe. Send the charger model. A lead-acid-only charger is how people cook packs.
What paperwork can you send?
UN38.3 is the usual transport packet. CAGE 93CZ2 and DUNS 109774429 for government bids. Other marks depend on the SKU — we send PDFs we actually have.
Customer marks shown as published by ChargeX. Ask sales for program context; this page does not invent a contract number.