question

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jlportman3 asked

Large solar arrray, want to convert from enphase to MPPT RS

I have 60 (soon to be 80) Sunpower 350 watt panels, each with an enphase microinverter, ac coupled to a pair of Quattro 10KVA/120/48s.

The enphase have become extremely unstable and very frustrating. I used to routinely see 14-16KVA from them but now they 'bounce' up and down all day, throwing 'grid errors' in the log and producing diddly squat. :)

I see Victron has a new MPPT 450/100 or MPPT 450/200 solar charger.

My question is, can I run 6 strings of 10 panels (43.5 volts, 8 amps) or must I break them into smaller groups? If I can run strings of 10, I will only need three of the 450/100 or 2 of the 450/200 chargers.

I realize my array is nominally 18.5 KVA and 480 amps!!! I have plans for that power!!!


Any and all help appreciated, especially from Victron.

MPPT Controllersenphase
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1 Answer
Paul B avatar image
Paul B answered ·

You need to be very carfull that you DONT exceed the 450 volt limit, and note its the OCV thats important 43.5 x 10 panels in series is 435 volts this in my opinion is VERY close to the 450 max limits, so if the panels over product especially at colder times you could have a issue. so measure the OCV carefully and make sure the max Regulator volage of 450v CAN never be excxeeded.

OCV = open circuit voltage

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