Quote:
Originally Posted by Bob Denman
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I wonder how long you'd need to run the engine; in order to fully charge a couple of those big suckers? 
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As usual the Devil is in the details, and fortunately in this case it’s simple math so shouldn’t surprise too many buyers.
“IF” it is indeed 11,000 Watt-hours of useable capacity, and you drained them down completely (and that’s a lot of battery energy), it would be approximately 800 Amp-hours (estimated at the assumed 13.2/12 Volts). Therefore, it would take at least 4 hours of driving to recharge at approximately 200 Amps from alternator. Hopefully, it’s a beefy unit to keep it from overheating over such a long period.
If charging from converter (or inverter/charger) at 160 Amps as marketing guy stated, it would take at least 5 hours to do the same. One concern would be that that requires over 20 Amps from shore power, so there isn’t much left for other items (unless charging rate is reduced).
Finally, if charging depleted batteries with 190 Watts of solar, which would make about 600 Watt-hours daily, it would take over 18 day’s provided nothing was being used in motorhome.
The bright side is that if using very little electricity while boondocking, it may be very easy to go for a week or two without having to charge batteries. I’d guess that other than air conditioning, battery capacity would be something one doesn’t have much to think about (again, assuming it’s actually 11,000 Watt-hours).
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