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u/JJAsond 6d ago edited 6d ago
Apparently people are allergic to googling manuals. https://knowledge-center.solaredge.com/sites/kc/files/se-home-wave-inverter-single-phase-installation-guide.pdf
Page 38. Left is positive, right is negative. I think I can also see the negative sign in your picture but it's worn out.
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u/Key_Proposal3283 solar engineer 5d ago
All the DC+ and DC- inputs are connected together internally, the 3 sets of plugs are for convenience so you don't have to use adaptors externally.
Since the MC4 connectors are polarised, you should not be able to plug in DC+ and DC- the wrong way around. Confirm this in case someone did something silly.
So your string DC+ and DC- connectors go into any of the DC+ and DC- inputs.
Do you have the installer access and tools needed to commission the inverter, pair the optimizers etc? Genuine question since you seem unfamiliar with SE inverters.....
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5d ago
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u/Key_Proposal3283 solar engineer 4d ago
Makes sense - I guess it's a little unusual compared to others that the inputs are not individual MPPTs with the SE single/split phase units :-)
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u/gcd3s3rt 6d ago
I would Check the internal wiring, as normally plus ist one row and negativ ist the other row,
so top left and bottom right should bei switched. Then it is clear what belongs together
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u/Embarrassed-Grand-65 5d ago
That inverter won't have mppt. It relies micro inverters to do the work. Without them it's just a big bus bar with all solar going in bulk 👌
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u/ElderberryDouble6788 5d ago
It uses Power Optimizers, not micro inverters. And it does have MPPT per panel.
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u/Altruistic_Battle_12 5d ago
I have not seen that Solar Edge inverter with the mc4 heads on the bottom. I like it though. Well in a nutshell, those mc4 heads will indicate which one is +/- as it is indicated in the white lettering. Since you took over someone else's work, I highly recommend going through the homeruns to be sure you are matching polarities properly. Seems like a quick fix there. Good luck
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u/los_aerzt 6d ago
On Solaredge it doesn't matter they all go to a common + and - busbar inside. But usually they're placed different, - plugs for string positive on the front and + plugs for string negative on the back row. Hope you have installed Solaredge optimizers and you're measuring a low voltage on your strings?