Re: [electricboats] Maximum input voltage for outboard?

Too bad about that 55V limit.  I believe them when they say that the battery is within spec, but I'm thinking that's because it uses NMC cells (7S) as opposed to LFP (8S) .

NMC would explain the stated nominal voltage (7 x 3.7V = 25.9V).  LFP would be 8 x 3.2V = 25.6V.  NMC also explains the light weight.  27 pounds for ~1,940Wh of LFP is significantly better than any other 'packaged' LFP battery I've found, but no problem for NMC.  NMC also explains the staying around 55V for much longer than LFP would.

The only downside to those batteries being NMC instead of LFP, other than (in your case) the slightly-higher resting voltage after fully charging, is the increased chance of thermal runaway.  So something to be mindful of.

As you suspect, you'll get only half the 8hp they'd deliver at full voltage.  Upside is your full-power runtime (without panel assistance) will double, and the panels will fill in for a greater portion of your consumption.  Depending on how happy you are with the resulting speeds, you could consider a 15S LFP battery, as that has a maximum voltage of 54.75V.

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