Originally posted by Sunking
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Originally posted by SunEagle View Post
I would get a 30amp unit. There are a number of good ones but none are really cheap. Midnite and Blue Sky make then. Possible the cheapest is made by Victron. Some people swear by Renogy but I think they are at the bottom of the quality scale.
Output Current Rating 30 Amp maximum, automatic 30 Amp current limit Nominal Battery Voltage 12 / 24VDC PV Input Voltage 57VDC maximum2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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Originally posted by littleharbor View Post
Watch out for the low max voc. of Blue Sky charge controllers. There's no practical way to series wire panels in a 24 volt system for max MPPT input voltage without going over their 57 volt max voc. Ex. 2-72 cell (24 volt) panels. Approx. 90 voc. 3 -36 cell (12 volt) panels, approx. 63 voc. 2-60 cell panels, approx. 72 voc. This low voc. limit on these controllers never made sense to me. They are fine for using 24 volt panels for a 12 volt system but even the model number, "Solar Boost 3024i" indicates it's intended for a 24 volt system. They do seem to be well built quality units otherwise.
Output Current Rating 30 Amp maximum, automatic 30 Amp current limit Nominal Battery Voltage 12 / 24VDC PV Input Voltage 57VDC maximumComment
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Originally posted by littleharbor View PostWatch out for the low max voc. of Blue Sky charge controllers. There's no practical way to series wire panels in a 24 volt system for max MPPT input voltage without going over their 57 volt max voc.
Answer, it is Chi-Com junk not made to work in a real world.MSEE, PEComment
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Originally posted by Sunking View PostWhat does that tell an informed consumer?
Answer, it is Chi-Com junk not made to work in a real world.
Blue sky controllers..jpg2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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Ok, I’m a little confused. Should I be wiring up my panels in series to provide a higher voltage to the charge controller if I’m going to get an mppt? Also, I see you are calling blue sky chargers junk and some think the Renogy is junk.... so what would be my best bang for my buck for around 400 watts of panels?Comment
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Originally posted by georgia088 View PostOk, I’m a little confused. Should I be wiring up my panels in series to provide a higher voltage to the charge controller if I’m going to get an mppt? Also, I see you are calling blue sky chargers junk and some think the Renogy is junk.... so what would be my best bang for my buck for around 400 watts of panels?Comment
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MSEE, PEComment
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Originally posted by Sunking View PostOK my bad, point is the input voltage is not practical.2.2kw Suntech mono, Classic 200, NEW Trace SW4024Comment
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Originally posted by scrambler View Post300W at 18V is 16.7Amp, so you would need at least a 20Amp MPPT charge controller.
If you want to have some margin or go to 400W solar, then 30Amp would be better.
Some will support a single battery type, some will support different ones, Consider that if you want to future proof your system.Comment
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