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diy solar

Voltage question, probably simple

dudeinthewoods

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Apr 7, 2020
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Ok, so I've got sets of 6 24v panels which is 144v total.
SCC says 160v (I forget but around there it's a bit above 144v)
Now when I check the panels my volt meter shows 32v or something like that.
Obviously 6 panels at 32v is more than my SCC can handle but is that the right way to determine how much voltage they're receiving?
Is it fair to call these 24v panels and say 6 of them is within my SCC spec? Not sure what voltage matters.

It's a makeskyblue controller and so far has been great.

Thanks!
 
I've got sets of 6 24v panels which is 144v total.
You need to look at the Voc listed on the panel. Your voltage limitations should be based off of that number. And even then, that is at 25 deg C. So at colder temps, the voltage will increase more at the rate of the panel's temperature coefficient (i think its around .2v per degree).

Yesterday someone had a hideously named 24v panel that had a Voc of 45v.
On the same thought, use Isc for the amps of the panel.

If you provide Voc and your SCC spec we can provide informed help.
 
Awesome, thanks! I've got 3 makeskyblue 60a SCC's.
Can't remember the Voc off the top of my head but I'll check.

How much room is there to play with on the SCC normally? I had designed it for 6 in series but Now I'm thinking I might only get away with 5.
I guess I can add another SCC and have 4 with 5 on each instead of 3 with 6.

Are these things safe as in they just shut down or add resistance etc or do they turn in to fireball 5V past the limit?
 
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