Last stupid question. If the 20v nominal panels are not supplying enough current to charge my batteries correctly, should the PWM CC be maxed out at 30V? I have to use what I've got until I can replace the batteries and get an MPPT CC. That could be a month or more. Thx
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Voltage isn't what charges your batteries, current is. If you series wire your panels the voltage will increase but the current will remain the same. End result you wont get any more charging than you would from a single panel with a PWM controller. In the meantime you need to keep the panels in parallel. Once you get an MPPT controller , then series wire the panels.Last edited by littleharbor; 05-25-2018, 12:11 PM.2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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Originally posted by littleharbor View PostVoltage isn't what charges your batteries, current is. If you series wire your panels the voltage will increase but the current will remain the same.
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Originally posted by jflorey2 View PostThe current will drop. For example, if he goes from 9P to 2S4P his current will drop by 60%.
Now that I read back my first statement is a bit confusing, unless you were reading my MIND as well. Oops! My bad.,
Thanks for the catch.2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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OK Suprasoup.. I'm obviously looking for the best controller at the best price.. Ebay has a few in the $200-$400 range. Anyone used the Mablestar from Amazon. I could afford that and it doesn't look like junk....
https://www.ebay.com/itm/40A-50A-60A...pAfOXhFqfIrCxw
https://www.ebay.com/itm/80A-MPPT-So...MAAOSw9gRZ~AGc
https://www.amazon.com/Mabelstar-Sol...rge+controllerComment
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Originally posted by douglasjett View PostAnyone used the Mablestar 80A MPPT from Amazon?
I would be careful to determine if it is a true MPPT type CC before you purchase it.Comment
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Originally posted by douglasjett View PostBecause Sunking... Someone sold me all this garbage as a kit, a guy in Phoenix. I had no idea what I was getting and trusted the dude.. ooops
But, in his defense his name was Budget and the price was right. I just had no idea that meant the whole thing would be toast in 6 months... again ooops
Next get rid of that nightmare foolish 9 panels in parallel to 3S3P arrangement.
As for batteries use 8 x 6-volt 400 to 500 AH batteries.MSEE, PEComment
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Originally posted by SunEagle View PostI have never heard of a Mablestar CC before.
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Quick math of Sunking's recommendation of 48v system 400ah bats looks like about $4K, I'm not sure how this helps when the budget is closer to $1100.. So, my idea at this point is try and find a midnite solar 150 for less than $500, buy 8 new batteries, wire the panels in 3S3P. Then stick with 24v until I have more money. Hopefully I can get 3 years out of the 24v system.Comment
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