what happen to my Inverter when i connect it to output of UPS

apollo0802

I have made a mistake when i trying the test (simulation) the inveter like that.
- I bought a adapter 220VAC/110VDC 3A to power up the Zeverlution 5000. I connect it with the DC side to power up the inverter.
- Then every thing ok. I connect the inverter to my wifi network. Then use the zever app to see the Inverter connect to the Zever Cloud.
- Then after few hours. I thinks that i should test it with the AC side. So i connect it with the AC power in my office. BUt mistake here that i forgot the AC socket is acttually is the power from the Online 1KVA UPS. 
- What happen is the inverter check the status aboout 2 process, 1st process is pass, 2nd process is "boom". What i think is the Capacitor discharge. Because i have open the board and see --> there are no problem with the board.

What should i do next/

BB.

You connected the AC output of your new inverter to the existing UPS output of your office? If so, then the inverter was damaged.

Most likely, one or more of the MOFSETs (output transistors of the inverter) have been blown. It is possible that you could replace them and get the inverter going again... But usually more than just the transistors themselves are damaged, many times the drive circuits for them are damaged too.

Realistically, it is probably time to purchase a new inverter and start over.

Good luck,
-Bill

apollo0802

https://photos.google.com/share/AF1QipOGjDRblm2aTnk6eO0CZWQppHKmrXTLVfvR5Jlv74wQzfq41z51c3nN9Sjvy4Awmw?key=dDVlU3B5OUltTGNTcUd1LUt4QnJBVGR3Qk9XZHlR
https://photos.google.com/share/AF1QipMqHwJGRHCQsOYXt3hvJCvXsPakId-EwV2UK32u1j2seI1MLQu3C856Jv5ZdRCFYw?key=S3dCamFPU1I2MVVfclRiUS1valBLY3NXaHdma0Zn
Thanks for the reply.
This is picture inside the Inveter. I check carefully but, it seem like nothing blown, it just like the Capacitor discharge.
Buying a new one is the final way.

BB.

On the second photo, heart sinks on the right.

Top one looks like it may have overheated (darker color).

Bottom FET heat sink may have some carbon on the heat sink.

Just guesses.

Bill