Sizing my Victron solar charge controller

DIY
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1

Im new to solar and could use some help.

I need a solar charge controller that can handle 2 – 250 watt solar panels in series to charge a 25.6 volt 100ah LifwP04 battery? Ax power current VMP 30.3V , IMP 8.27 ISC 8.85 MAX FUSE 15A. HIGHES VOLTAGE i EVER SAW HERE IN CAMP VERDE AZ.86322 WAS 70 VOLTS. LOWEST TEMP 29F HIGHTES TEMP 105 F

2

Victron have a nice tool for this:

But basically 2 x 250W = 500W / 26V =19.2A; so a 20A controller will be fine.
What you don’t give is the Voc from the panel detail, for 30V Vmp, the Voc is going to be 35 - 39V, so 2 panels in series will be <80V, so the 100V 20A controller will do nicely.

3

Thanks for your help.