Smar solar mppt for solar on campervan

Hello everyone! I'm looking into a solar array for may campervan and I'm trying to understand the capacity of the smartsolar 75/15 Vs 100/20. I would like to install mounted orizontal on my rooftop 3x 430w (Vop 38,30 Impp 13,52 Isc 14,29) panels each with a dedicated mppt to charge a 560Ah 12v lifepo4 battery bank.
Now my question is should I go with 3x 100/20 or am I good enough with 3x 75/15? It's my understanding that under 75v of open circuit I should be ok, right?

75/15 means:

75Voc maximum array voltage even in the coldest conditions.
15A output to battery.

The datasheet gives the maximum power output for 12 and 24V systems and should be about:

14.4V * 15A = 216W
28.8 * 15A = 432W

To fully utilize your array, you would need 3 * 430W / 14.4V = 89.6A of charger output.

So you would need 3X 100/30 if you want to fully utilize your array.

sunshine_eggo said:

75/15 means:

75Voc maximum array voltage even in the coldest conditions.
15A output to battery.

The datasheet gives the maximum power output for 12 and 24V systems and should be about:

14.4V * 15A = 216W
28.8 * 15A = 432W

To fully utilize your array, you would need 3 * 430W / 14.4V = 89.6A of charger output.

So you would need 3X 100/30 if you want to fully utilize your array.

Click to expand...

Thank you! This makes now a lot more sense to me.