carl2591 wrote:
they say one thing and other places say other things.. who is correct??
It is tricky...at first.
Notice in the specs it says "Nominal system voltage" of 12,24, 36 or 48. That's important.
1200w of solar @ 24v = 50amps, but, maximum battery amps is 45. How they can say that? It is because 1200w of solar will almost never put out 1200w, it will be somewhere around 1000 on a really good day. So that equates to 1000/24 or 41.6 amps AT 24 VOLTS to the batteries.
1200w of solar @ 12v = 100 amps (ok, maybe 80). You can't put that on 12v batteries unless you want to lose half your amps to heat and possibly destroying the controller, hence the 600w rating AT 12 VOLTS.
This is why, when you start getting up in power you need to look at running higher voltages. Myself I run 100+v of panels and I have a 48vdc battery bank. Higher voltage and lower amperage perform more efficiently and don't require thumb-sized wire.
If what I just said went over your head, spend some time with this:
12v side of life.Someone may correct anything I've said here, but this is my understanding of it.
