Interesting. I have four 100Ah LiFePO's in series running my motor. My no-load voltage after charging is around 53.8 volts. I believe that to be normal. If you read your meter correctly, I am at a loss as to where the extra 4.5 volts would come from. Maybe your batteries have an extra cell in them?
Pat
From: electricboats@groups.io <electricboats@groups.io> On Behalf Of James Jones
Sent: Tuesday, September 13, 2022 12:55 PM
To: electricboats@groups.io
Subject: [electricboats] Maximum input voltage for outboard?
Hi all,
I've just completed building an electric-powered boat, and upon wiring up the batteries found that the voltage at the end of the line (electric outboard power plug) is higher than expected.
My battery bank is four (4) 24v / 75 Ah lithium ion (LiFePO) batteries, wired with two pairs of batts each wired in parallel, and then series connecting the pairs, which should produce a nominal 48 volts output. The meter however reads 58.3 volts, which is higher than the combined "fully charged" voltage "should"(?) be. Since my outboard (Karvin 6800) has a maximum input voltage of 55 volts, this creates a puzzle. Am I missing something? Do I need to add a component to reduce the output voltage of the batteries? Etc...
Any advice much appreciated,
Jim
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