12 kW is correct for peak electrical measurement, but not when considered as heat energy.
240 VAC is a peak measurement. It occurs 60 times a second. But ability to handle heat is what determines how expensive it is to manufacture a charger, and for that he is correct to use some sort of average kW value rather than peak. I didn't check his numbers; they're based on whatever his assumptions are. But his is the right direction to go when considering heat load.
What we don't know is whether the manufacturer of the charger has already taken that into account or not....and that's critical.
Roger L.
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----- Original Message -----
From: hanSent: Sunday, December 01, 2013 5:09 AMSubject: Re: [Electric Boats] RE: Pearson 10M electric power?240 V x 50 Amps = 12 kW.
No ?
On 30/11/2013 22:04, dfwmcse@yahoo.com wrote:
> Chances are, the bottleneck for this whole system is going to be the
> charger. Shore power in the best circumstances: 240vac at 50 amps,
> 240vac is around 152vdc, and the charger is not going to actually pull
> all 50 amps or it risks tipping the circuit breaker. 45 amps is
> closer to the max current on a charger connected to shore power.
> That's around 6800 watts, give or take. A 7kw charger would be the
> ideal fit. I chose a 6kw charger because stepping up to an 8kw charger
> added another 30 percent to that component cost.
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