EG4 6500ex PV input limitation

[scottmag]

I've got a single 6500ex with 6kw of pv feeding into it. I'd like to max out the input of the 6500ex, which is stated as 8kw. What would happen I installed closer to 9kw of panels (because I have extra laying around)? Would it cause problems with the 6500ex or would the 6500ex just throttle the input down to 8kw? My thinking is, if I add extra panels above the stated limit, on days when there's clouds I'll have "access" to more because of the oversized panel strings.

Am I on the right track or should I definitely not install more than a total of 8kw of panels?

 

[wpns]

As long as you never exceed Voc you’re fine, it’ll only draw up to the power limit.

 

[Adam De Lay]

8kW is the max it can utilize. You can over-panel a little bit and it will throttle down to the 8kW.

Make sure you don't go over the Voc. That's a hard limit. You can go over in current but there is a limit before even that could start causing damage. I can't recall what that is though.

 

[scottmag]

Ok thanks that really helps. So the system also has a 500voc limit. Does that mean 500voc per input (it has two pv inputs) or is that 500voc total (so 250voc per input)? If it's 250voc per input, I need to do a serious reconfiguring of my panels. They are currently on two strings of 10 panels each, 300w panels each at 40.1voc....

 

[wpns]

500Voc on each input.

 

[Adam De Lay]

Each input is maxed at 4kW each within the constraints of 500v and 18a. Actual working voltage is 90-450v but it really doesn't start till you get near 100-120v if I recall.

 

[scottmag]

That's really helpful yall, thank you. I had chatGPT draw me up a wiring diagram for my setup on each pv input. This is what it gave me. (screenshot attached)...

I'll need a couple parallel connectors...will this do? https://signaturesolar.com/flexible-branch-pair-mc4-style/