So, if you you got one of the newer (discontinued now) Sunny Boy inverters (3.8, 5.0, 6.0, 7.7, etc.) and there is a password already set and you don't know it, you need to get a PUK (Personal Unlocking Key) for the inverter. To get the key you need to give SMA the serial number of the CONNECTION UNIT. Now BEWARE - some Sunny Boys have multiple serial numbers. I say some because not all do. Some have only 1 serial number. Others have one S/N for the lower part (the connection unit) and a different S/N for the power unit (the top part). Still others have the same S/N for both the top part and the bottom part. Makes for much confusion. Also, the S/N on the boxes (if new in box units) have the S/N of the connection unit. Anyway, to get the PUK you need the S/N of the lower parts - the connection unit. As mentioned, it could be the same as the power unit, or it could be a different number. I found out the hard way since I have inverters with every S/N variation available it seems. I gave them the wrong S/N and of course the PUK did not work. Hope it helps someone sometime.
Also, if you want to get tech support, you need to give them the S/N of the CONNECTION unit. If you give them the S/N of the power unit, you could get an "invalid S/N error" and not be able to create a "case" as they call it. I had that happen also. I just gave them a S/N of an older unit and that worked. Had I given them the S/N of the connection unit (in cases where the 2 units have different S/N's) the i.e. system would have accepted the S/N as valid and let me file the case (get tech support).
They did respond relatively quickly and I got the puk and am back in business.
This is also important if you buy a USED inverter and it has a password set and the seller did not tell you what the password is.
Also, if you want to get tech support, you need to give them the S/N of the CONNECTION unit. If you give them the S/N of the power unit, you could get an "invalid S/N error" and not be able to create a "case" as they call it. I had that happen also. I just gave them a S/N of an older unit and that worked. Had I given them the S/N of the connection unit (in cases where the 2 units have different S/N's) the i.e. system would have accepted the S/N as valid and let me file the case (get tech support).
They did respond relatively quickly and I got the puk and am back in business.
This is also important if you buy a USED inverter and it has a password set and the seller did not tell you what the password is.
