Re: [electricboats] Replacing FLA Batteries with Lithium in Duffy Electric Boat

I didn't see a mention of maximum controller input voltage supported in that document,

but I would think that a 48V-nominal lead-acid battery would be charged at well over 56V

before getting to the float stage.  You could throw a voltmeter on it during charging to see

that, then maybe try to fire it up when the voltage is more than the 54.6V you're wondering

about, to confirm that the controller is happy with that much voltage.

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From: electricboats@groups.io <electricboats@groups.io> on behalf of Roland Kruijer <martine_roland@hotmail.com>
Sent: Wednesday, May 11, 2022 6:13 AM
To: electricboats@groups.io <electricboats@groups.io>
Subject: Re: [electricboats] Replacing FLA Batteries with Lithium in Duffy Electric Boat

 

Hi,

Maybe this helps? https://www.zapiinc.com/sites/default/files/ZAPI%20SEM-1.pdf 

I think the ability has more to do with maximium Amperage the controler can take, but tell me if I am wrong! 

I have a Duffy 18, on 36V Lifepo4 and the original Curtis controller which is only suited for 36V.

Roland

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Van: electricboats@groups.io <electricboats@groups.io> namens Rob Houston, W0WKO <rahouston@gmail.com>
Verzonden: dinsdag 10 mei 2022 12:55
Aan: electricboats@groups.io <electricboats@groups.io>
Onderwerp: [electricboats] Replacing FLA Batteries with Lithium in Duffy Electric Boat

 

Hello, All,

I have an older 16-foot M160 Duffy Electric Boat, which is a somewhat rare model with a hull similar to a tri-cat.  The lead acid batteries in the boat (8 220 Ah 6V GC2's) are nearing end of life, and I'm considering upgrading to a 48V 150Ah lithium ion battery, specifically NMC chemistry (13S @ 4.2V=54.6V max).  

The boat has a 5hp motor connected to a Zapi SEM-1 controller.  Should I be at all concerned that the NMC battery will provide 54.6V to controller? Are controllers generally able to handle this level of over-voltage?

Thanks in advance for any helpful comments or perspectives you can provide!