[RE-wrenches] Charging a 108V battery bank

[Lloyd Hoffstatter]

Dave, this forum discussion should be helpful https://www.cruisersforum.com/forums/f14/differences-in-marine-and-rv-inverters-chargers-38195.html

Best regards,
Lloyd

Lloyd Hoffstatter
Sunstruck Consulting
945-657-8132

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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Dave Tedeyan <dave at sungineersolar.com>
Sent: Wednesday, June 30, 2021 3:50:15 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] Charging a 108V battery bank

Hi All,

I am going to be working with someone who plans to completely electrify a boat. The electric motor is meant to run on nine 12V batteries, or 108V. The motor manufacturer recommends a charger that can run on 120V or 240V. But has anyone seen a charger that can take solar power and directly charge a battery bank of 108V? The alternative that I see here is to have two separate battery banks, one for the motor, and one for house loads. Then we would have the solar charge a 48V battery bank, and then use an inverter to charge the 108V battery bank. It seems inefficient, although that may be the only choice.

A separate but related question: what is special about a marine inverter? If there is a 5kw charger for the battery bank, we will need a large inverter to handle this plus other AC loads, and I am not sure if there are "marine" inverters this large. And so other than concerns about getting wet, is there harm to putting a Radian, or a Sol-Ark on a boat?

Cheers,
Dave

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