Nice looking boat! I would not put a stepdown converter into it. Can you maybe get a charger that can be set to charge at 55V instead? That will be better for the LFP cells anyway, you don't get much more capacity by charging them higher than that anyway and it will make them last longer if you limit the charge voltage. Also in my experience you can run motors at slightly higher voltages without damaging them - just don't run at full speed when the batteries are fully charged - it will very quickly go below the 55V as soon as you start powering the motor, I would guess that within the first 10min or so they will be down under 55V.
On Tue, Sep 13, 2022 at 7:55 PM James Jones <jgjones252@gmail.com> wrote:
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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