Yes the 15A is max battery charging output.
It's simple. I updated my last post.
To size a SCC take the total wattage then divide by battery voltage.
600w ÷ 12V is 50A
600w ÷ 24V is 25A
A 24V battery would halve your SCC amperage saving money and allowing smaller gauge cheaper wires.
Those small 100 watt panels and 12V battery is going to cost you.
Wire size from panels to SCC.
Vmp total of array
Amps total of array
One way distance.
Under 3% is good.
I doubt if your distance is that much.
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I think I'm now ready to try to understand this better. I'm limited to a 12V battery bank due to the "low temperature" requirements of the Relion batteries I'm using.
I'm under the assumption that I can have regular old MC4 wire from the panels to the SCCs. That's the way I do it with the 1600 watts of panels connected to our two Yeti 3000s. But given that the voltage and amps will be higher with these larger panels, perhaps my assumption is incorrect?
I'm also assuming that with the SCCs mounted just above the 12V battery bank, that while the wires may need to be thicker, it will be a short distance and so not too costly.
I haven't put any thought into the wires obviously, so thanks for any continued education. The longest run from a solar panel to a charge controller will be under 30 feet in our case.