Paul Posted December 16, 2022 Share Posted December 16, 2022 Well its been a bit of a sad day as I was completing ugrades to our little off-grid home in rural Uganda. I had took a classic PJ 3K 24V - 230V which had worked reliability for us in the uk before I upgraded there to a larger inverter last year. The little inverter worked perfectly until I accidentally dropped a tool when working above it on something else. Foolishly I hadn't got around to insulating the DC terminals and the tool made contact between the +24v terminal and the case. There was a very small spark and the inverter cut out. Now when switching on, the green LED comes on, there is continuous beep for a few seconds, then the fan operates for a few seconds, then it shuts off. There is no drive to the FETs but none appear blown and their green LEDs are on. The only anomalies I can see are the 5v regulator on the control board is extremely hot and the MCU is hotter than I would expect. The 5v regulator (the wonky TO220 package with a small aluminium heatsink) measures 12v on its input pin and 5v on it's output pin. I note that there is an 'earth' terminal on the control board which has a connection to the chassis via the AC outlet (yellow wire), so I guess this is how the damage occurred, my incompetence aside! I have not investigated how or what this earth terminal connects to yet. Anyone have any idea what else I can test to determine whether it is repairable or will have to be consigned to the PJ scrap bin? This would be a real shame as this inverter powers everything we need in this little house and happily sustained continuous loads of 2000w, which is better than the new generation of PJ/upower 6k inverters! Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.