question

johanr avatar image
johanr asked

What mppt to get?

Can you please assist on what size mppt controller I should get:

Solar panel specs

2x 120 w in parallel

Pm 120w per panel

Voc 24.2v

Isc 6.46a

Imp 6.07a

Temp coefficient Voc -0.33%/C

Temp coefficient Isc 0.06%/C

Normal operating cell temp -45 to 80C

Battery specs

13v 108ah lifepo4 lithium 1400wh

Float charge 13.6v


MPPT SmartSolarmppt charging
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1 Answer
Elimac avatar image
Elimac answered ·

A 75/15 will do. Choose lithium profile.

But keep in mind that you may need more pannels, depending or your load.

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Ingo avatar image Ingo commented ·
I wonder about that, rather use the Victron MPPT Calc spreadsheet to verify the best selection. The charge current will be clamped at 15A when using a 75/15. I would use a 100/30 to be on the safe side as you can get 23A out of it during peak conditions.
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Elimac avatar image Elimac Ingo commented ·
If one is worried about that, then the /20 would be a perfect fit for those pannels. And I would connect them in series.
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Related Resources

MPPT product page

VictronConnect manual

PWM or MPPT

MPPT calculator

MPPT codes

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