2x SP120's in series will not charge AC200

I am pretty sure I used to charge my AC200 w/ 2 SP120’s because 2 have Vmp with max sun 39.6V and the AC200 needs 35V. But today in full beautiful (but hot) sun I am getting 31.x V. The AC200 is acting like it’s charging but it’s only increased 1%. Thoughts, or anything I could test? And I’m surprised if it wants 35 and it’s not getting it that it is doing anything at al. Thanks!

Hi @Lee , The VOC of two SP120 solar panels connected in series is 47V, which can be charged if it matches the VOC range of AC200.
There are many factors that affect the solar input. Is your solar panel covered? Is there dirt on the surface? What is the length of your connection cable please?

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It would be helpful if you stated how many watts of incoming charging you are receiving and a picture of your panels showing the conditions.

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