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timo-1 asked

8 Panels (east / west)

Hi,

I have 8 panels (200W, VoC 20,25V, Vmp 18V,Isc 12,68A). 4 Panels are facing south, 4 Panels west.

What is the correct way of "plugging" them together?

  1. All 8 in a row, with one MPPT 250/60 (or would i loose Ampere during morning times, as 4 panels are in shadow)?
  2. 4x2 (4 in a row) with one MPPT 150/30 connected via Y cable (or is the MPPT not able to find the maximum / best MPPT point for those two strings?)
  3. 4x2 (4 in a row) with two MPPT 150/30

As option (2) is of course the cheapest option, I would of course prefer that one..

Thanks a lot!

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2 Answers
marekp avatar image
marekp answered ·

@timo

The best way is to install two MPPT chargers. One for each direction.

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timo-1 avatar image timo-1 commented ·
@MarekP thanks for the answer. That is ofc also a pretty expensive one :-)

How will option (2) behave comparing to option (3)? Much worse (like 20% less power) or only a little worse?

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tom4x answered ·

Use MC4 plugs with diodes to prevent a current into the shadowed panels.

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