octavgeo

I'll try a higher power bulb. The one in the video already has 250W. I'll probably put another 250W one in parallel. The 20uf 350VAC capacitor right after the last relay is not shorted. GROWAT really looks very similar to Axpert, it only has small differences. I also thought that it's possible that there's something wrong with the charging circuit. On the other hand, maybe that's how the inverter behaves, drawing a higher current at startup before the PWM starts and controls the IGBT from DC-AC. I'll probably try to start it without bulbs, and put a 10A automatic fuse and maybe that fuse will just trip...

Hello. @Coulomb or @BritishRacingGreen I have a question for you if you can help me with an opinion. I have a GROWATT SPF 5000 ES inverter that suffered a failure on the PV side, meaning that it had voltage spikes on the PV and went into failure with error 61. Upon checking, I found that the 7912 voltage regulator was defective and instead of -12VDC I had -13 or -14VDC. The problem is that after I changed this regulator, I somehow managed to drop some solder on one of the drivers that drives one of the IGBTs (L DN or N DN), it shorted out the driver output, and my house fuse tripped and I was left in the dark. After replacing this driver, I found that the inverter works perfectly when I connect a power source instead of the battery, it generates a 230VAC output, but if I connect the inverter to the 230VAC input using a current-limiting bulb, the bulb lights up as if the inverter has a short circuit. I checked everything, I didn't find any short circuit, but that bulb always lights up and the inverter doesn't work. Is it normal for that bulb to light up, and should I risk running the inverter directly on the network, without that bulb? Or does the inverter still have a problem? I'll attach a few links where I filmed how it behaves only on battery or only on AC. On battery, you can clearly see how PWM works, but on AC, PWM only comes into action for a fraction of a second when it switches the relays.