From: hardy71uk <p0054107@brookes.
To: electricboats@
Sent: Sat, July 10, 2010 5:28:23 PM
Subject: [Electric Boats] Re: Battery charging time
Well I estimate on the back of an evelope as follows-> takes about 1.2kw hours per battery . so 4.8kwh total . if you had a 100% efficient charger that would take about 6 hours for an average input of 800watts. Say 8 to 10 hours for a reasonably efficient real charger. I'm guessing that the honda 1000 could probly provide 800watts continuous.
Efficiency wise I think we are talking around 6.5KWH input for about 4KWH to the motor.
Chris S
--- In electricboats@
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> If I had a 48 volt system with 4 12 volt 100 amp hour batteries how fast could they be charged. If I had a 10 kw generator how much would be wasted.
> What I am wondering is if one of the Honda 1000 gen sets is more than adequate?
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> --- On Fri, 7/9/10, hardy71uk <p0054107@...> wrote:
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> From: hardy71uk <p0054107@...>
> Subject: [Electric Boats] Re: Anyone have experience with 144 volt motor systems?
> To: electricboats@
> Date: Friday, July 9, 2010, 2:38 PM
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> Good points . but usually the greatest efficiency loss comes from using a gen to charge batteries . Best practice might be to charge from shore power and run the motor some of the time from the generator to conserve the battery power. DC motors can be run from an ac supply via a simple rectifier.
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