willem12345

@Coulomb, thanks again for the speedy reply.

@Coulomb, Hi, On the topic of these fans. Is there a way that I can switch them on permanently? I'm getting a 51 error on my 5kw-48dc inverter. so I want to see if this makes a difference. And I see this topic is quite old, is there an updated way to upgrade the firmware version, and is there an advantage to updating the fw with regards to the 51 error?

Thanks so much for your response, @Coulomb. I'm an electronic/software engineer, so I can probably fix it on a hardware level. So like most software engineers, I hoped that I could fix it with a firmware update. But the device is still in its warranty so it's going back for them to fix it. Your cracked resistor theory is probably spot on considering that it happened the first time on a very cold morning.

I'm wondering if you can help me, I've go a Axpert 5kva connected to a 2.4kva Shoto battery(50ah, 48v), no solar connected yet. I also got the 03 overvoltage error on my system. So I shutdown the system and did the following. I powered off everything, including the battery(all wires still connected). I powered on the battery, the inverter screen light up and shows the battery symbol, indicating the battery is connected. I then switched on the main breaker that supplies the inverter with AC, the screen then indicated that the AC was connected and within 5 seconds the battery started to charge. Then I switched on the invertor with the little black switch at the bottom, for 10 seconds nothing happened(while the system initializes). The screen then showed the bypass symbols for n split second it disappeared and the alarm buzzer started sounding off and the screen showed the error 03. The battery then shutdown and proceeds to enter into a protection mode. To my understanding and what you have describe, a 03 indicates overvoltage on the battery terminals, so while it was showing this error I used the up/down arrows on the Axpert to navigate to the batt voltage display and the reading showed 120v(I did this whole sequence 4 times, every time it shows exactly 120v). The battery has been tested properly and works as expected indicating there is nothing wrong with the battery, I'm 100% sure of this. This system has been running for 2 to 3 years in this configuration and this problem occurred 3 weeks ago. Any suggestions to what could cause the. This problem occurred randomly, meaning when everything was fine with the mains. The mains did not cut out.