PWM controller question

BFL13 wrote:

jrnymn7 wrote:
BFL,

As for the calibration issue, is that something that would put those +.5v settings back in line?

No it is not something you can change. Just set it to something and then wait till the battery stops rising and see what it stops at. Try it at a couple different settings to be sure, then use that as an index error to correct for. It's no bother once you know what to allow for.

I have no idea if they all have an error like that, but just hope any one you get does not have the error in the other direction so it can't do its 15. It is encouraging that Niner's was high. I don't know if his second, new one is too.

Not to be confused with the difference you might also get between controller and battery due to voltage drop on the wires

--If you get two controllers, then with the two panels you could also do the split bank trick if ever wanted to again, and have one solar set for each bank

Second new one is identical to the first... 5 feet of 12 gauge stranded from charge controller to battery yields 15.3V with 15.0 on the charge controller showing, with my digital hand held meter. It's not a problem, go with thinner gauge wire to the battery and engineer in the V drop you need to get them to match, for length of wire and voltage drop. The chinese were probably counting on you being a cheap skate with thin inexpensive smaller gauge copper wire anyways! I'd rather have 15.3V and not need it, than need it, and not have it.

Any time you work with electrical on this type of stuff, Trust, but Verify with a DMM... Always. Never assume that assembling a bunch of components together, this is what you are going to get.