Re: [electricboats] Maximum input voltage for outboard?

58.4 is a fully charged lifpo4 48v system (16s) I would be pretty surprised if you had anything other than 16s or your case two 24v (8s) in series. 

I don't have any specific knowledge of that motor but I would also be surprised if it was not designed to work with lifepo4 16s. 

Maybe your meter is faulty? maybe there was miscommunication? 

What does concern me is the 58.3 volts. It should only be at that high of a voltage when charging and only for a short period. Resting voltage should be around 53-54 volts. 

Matt Foley 

Sunlight Conversions

Perpetual Energy, LLC

201-914-0466

sunlightconversions.com

instagram.com/sunlightconversions/

youtube/sunlightconversions

On Tuesday, September 13, 2022 at 01:20:50 PM EDT, greenpjs04 <forums@greensdomain.com> wrote:

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