Hello all, I'm troubleshooting an interesting case. It's a DC coupled SMA Sunni Island system with two of the 6048 SI's. I think that the both of the SI's are fried, and I think I know why, but there's a strange twist so I thought I'd ask if anyone here has any insight...
So this is a DC Power system, and whoever was building these at DC power made a mistake on the Main wire that connects to the battery, so the connection came loose. When I looked at it for my client, I saw that there is an internal capacitor in one of the SI's that is blown. I assumed that the loose connection cause voltage spikes from the charge controller to damage the inverter. But then I repaired the wiring, and everything powered up fine, and the SI system was putting out perfect power. Then, two days later, I looked at it again because the customer was going to come pick it up, and the inverters were apparently dead. I tried resetting them, but it seems like there's just nothing. The screen won't come on, it won't make any noise, etc. There is good voltage on the DC in terminals. So my question is why they both came on, and why they both fried after the problem was fixed. I mean, it makes sense that they were damaged from the voltage spikes from loose wiring, but I don't understand why they would come on and then finish frying with no load... Other question, I know that with outback inverters, you can normally repair the inverter by replacing a board that is a fraction of the cost of the inverter. Is this so with SMA SI's? And does anyone have a recommendation on how to troubleshoot at a board level, or where to source the boards? I did already tell the customer that I think his inverters will need to be replaced, but just hoping to make sure I don't overlook something first... Thanks, Kienan Maxfield Solar [email protected]<mailto:[email protected]> (801) 631-5584 (Cell)
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