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48V Batteries

A 48V battery moves four times the energy of a 12V pack at the same current, which is why nearly every electric marine system above about 3 kW is built around one. In lithium iron phosphate form, the class runs at 51.2 volts nominal, sixteen cells in series, and that is the figure you will see on the spec sheets below.

M-Oceans stocks 48-volt LiFePO4 batteries in Canada from Epoch, RIM Drive, WaterWorld, and ePropulsion, along with solid-state packs, in capacities from 30Ah to 210Ah. Most are marine deep-cycle batteries for outboards, pod drives, and trolling motors. The golf cart and equipment kits here share the same chemistry and the same charging rules.

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Reading the Specs: Ah, Wh and What Matters in a Canadian Season

Two packs in this collection can look impossible to compare because manufacturers label them differently. One is rated 200 Ah; the next is 13,600 Wh, and they describe the same property in different units. Divide watt-hours by nominal voltage to get amp-hours: 13,600 Wh at 51.2 volts works out to roughly 266 Ah. Use watt-hours when you are estimating runtime against a motor’s power draw, and amp-hours when you are sizing cable and fusing.

Temperature is the second question, and in Canada it is the one that costs people money. LiFePO4 discharges in the cold without complaint, but charging a pack below freezing damages the cells, and a decent battery management system will refuse to try. For a boat that stays in the water into November or a cottage bank that sees a full winter, a self-heating pack solves this at the cell level instead of asking you to heat the locker. Several Epoch batteries in this collection are built that way, and some add Bluetooth monitoring or Victron communication if the boat already runs a Victron system.

Last, check what the battery has to talk to. Some motors expect a matched pack and will not report state of charge from anything else. If you are not certain what pairs with your setup, send us the motor model and we will confirm it before you order.


FAQs on 48V Marine Batteries

What is a 48V marine battery?

A 48V marine battery is a deep cycle pack built to run electric propulsion and house loads on a boat, wired as a 48 volt system. In lithium iron phosphate form it operates at 51.2 volts nominal. Compared with a 12V bank of the same energy it carries a quarter of the current, which means thinner cable, lower losses and less heat.

Can I wire four 12V batteries in series to make 48V?

With some batteries, yes; with many lithium packs, no. Series wiring is only safe when the manufacturer states the model supports it, because each pack’s management system has to tolerate the arrangement. Several batteries in this collection are parallel-only by design. Check the specification before you buy four of anything, and never mix models, ages or capacities in the same string.

Will a 48V lithium battery survive a Canadian winter?

Stored properly, yes. Bring removable packs indoors at haul-out and leave them at roughly half charge rather than full. Fixed banks that stay aboard need either a heated space or a self-heating battery, since the risk is not the cold itself but charging while the cells are below freezing.