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Old 08-19-2015, 02:03 PM   #21
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Yes. The type 27 marine deep cycle $89 battery from tractor supply.

I'm not too worried about whether it lasts beyond a year. I can replace it and the key is its chgeap!
Ah.. Hybrids. That makes sense. I've never seen cranking amps specified for true deep cycle batteries.
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Old 08-19-2015, 10:40 PM   #22
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These are interesting claims.... http://www.irv2.com/forums/f93/solar...ns-146264.html
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Old 08-19-2015, 10:42 PM   #23
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A quick look shows that the people who were successfully running the microwave for minutes have battery banks that are 450Ah or above...
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Old 08-19-2015, 10:52 PM   #24
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Yes. That's just about 4 of the 105ah batteries. Only 30ah short.

Question is how long itd take to charge 420ah using a 700w generator.
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Old 08-19-2015, 10:53 PM   #25
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And of course, we don't know how warm their batteries get
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Old 08-19-2015, 11:13 PM   #26
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Yes. That's just about 4 of the 105ah batteries. Only 30ah short.

Question is how long itd take to charge 420ah using a 700w generator.
It'll take several hours to charge a 420Ah bank. A medium sized battery charger will put in 40 amps. The thing is you can only charge at that high for "bulk charge", then the amps will decrease to finish off the charge, then they will decrease further to float charge. Probably around 5 or 6 hours to charge from 50% to 100%.

A 700w generator should be up to the task, though.

Solar is really the way to go for something this size. You can get 2x 300 watt panels for a reasonable price. They'll put in that 40 amps with no problem and do it silently.
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Old 08-19-2015, 11:40 PM   #27
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I quite like those 700w harbor freight generators!

I'm not really convinced that solar is really such a great bargain. Let's say a $100 generator charges the batteries in 6 hours using a gallon of gas. Heck, even if it uses two gallons, that's $4 - $4.50.

Hmm... 800 watts of solar is $189 for 100w or around $1512 which at current gas prices is about 700 gallons. Or between one and two years of charging batteries.

I can kinda see a point to solar but the economics just aren't attractive.
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Old 08-19-2015, 11:48 PM   #28
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Hmm... 800 watts of solar is $189 for 100w or around $1512 which at current gas prices is about 700 gallons. Or between one and two years of charging batteries.
Holy snikeys! Where are you looking? That's way high.. I bought my 600 watts for ~$680 Canadian dollars. That's $518 US dollars at the current exchange rate.

Either way (solar or generator) you have to buy a charge controller, so that price is irrelevant.

So the equivalent cost would be a $99 generator and $590 worth of gas, which works out to ~160 US gallons. I've been off and on living in my bus since April and I'm almost at the point where a gas generator would have been more expensive.
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Old 08-20-2015, 10:16 AM   #29
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Holy snikeys! Where are you looking? That's way high.. I bought my 600 watts for ~$680 Canadian dollars. That's $518 US dollars at the current exchange rate.

Either way (solar or generator) you have to buy a charge controller, so that price is irrelevant.

So the equivalent cost would be a $99 generator and $590 worth of gas, which works out to ~160 US gallons. I've been off and on living in my bus since April and I'm almost at the point where a gas generator would have been more expensive.
I was looking at the flexible panels on eBay. I see the 100W panels for $189.

I need to keep the profile low because I'm parked under trees. One branch already took out a roof level side marker. Fortunately I found it and was able to glue it back.
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Old 08-20-2015, 10:24 AM   #30
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You could look at a portable kit of solar panels.

Rigid panels, build a trolley and park in the shade. Low heat in the bus, maximum voltage from the panels.
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