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Jan avatar image
Jan asked

Mppt 75/10 maximum amount of solar panels

Can someone please advise on what the maximum amount of solar panels I'm able to connect to a mppt 75/10. The only actual limitation (not considering the 10A maximum charging capability) it seems is the 75V Voc rating if I'm correct?

If a 100W panel with a 22.3v Voc is to be used...

It's my understanding: 75/22.3 = 3.36

Meaning a maximum of ×3 of the above mentioned panels

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seb71 avatar image
seb71 answered ·

You also have to calculate the string voltage in the lowest possible temperature for that place (in cold weather, panel voltage can be higher than Voc). This must remain under 75V (for that 75/10 charger).


Regarding the total power of your PV array, it depends on the battery voltage (higher is better). You can oversize the array (for cloudy weather/winter production), but do not exaggerate.

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Jan avatar image Jan commented ·

Thank you for the quick response


Considering I only have a limited amount of the actual solar panel specifications available, how does one go about doing this?

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