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edge avatar image
edge asked

Is 21.7 Voc and 17.5 Vmp to low for 100/20 mppt

Hi, i have a 250 w panel on my caravan with a 21.7 Voc and 17.5 Vmp. Is this panel suitable for a 100/20 mppt.

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JohnC answered ·

Hi Edge. Yes, that would be fine. Note that the mppt won't kick off until it sees a 5V difference between Vbat and Voc, but once started Vmp comes into play and 1V diff will keep it going.

That shouldn't be a worry except in v poor light conditions like at dawn, etc. Yeh, you've picked the right one.

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boekel avatar image boekel ♦ commented ·

it is on the edge...but he has the user name for that so ;)

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