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mark1961 avatar image
mark1961 asked

Is MPPT 250/100 suitable for 8kw 48v pv array?

Hi everyone - first post so hope it’s not too stupid! I’ve just had a home solar system fitted 8 kw, 48 v feeding a 250/100 MPPT into 2 x Li-ion 4.8 kva batteries ( plus 5 kva inverter). The maximum power output I get ( midday, mid summer, high sun, clear sky, clean panels) seems to be c 5.5 - 5.7 kw when I would expect more like 7.5 kw - is this right?

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seb71 answered ·

250/100 can output maximum 100A.

With a 48V (nominal) battery/system that means maximum of about 57.6Vx100A = 5760W. So exactly what you get.


When the sky is not clear, having more than 5760W in PV panels will help.

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mark1961 avatar image mark1961 commented ·
Thanks. Does that mean that to take full advantage of what the array should output, which is 8kw that I have to add another MPPT or swap what I have for one with increased capacity -( if there is one? )
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