[RE-wrenches] Charging a 108V battery bank

[Dave Tedeyan]

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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Dave Tedeyan, P.E.
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