In the hope that there are some experienced people here, I am trying to find the reason why and how I killed a UPS.
To make a long story short I attached a car battery to an old MGE Nova AVR 600 (360W/600VA) for testing to see if it can handle a single computer. When I disconnected the line power all transistors blew up as seen on the attached picture. I know it worked before, because first I tried it with an old unused car battery, and with that battery it was running (I could hear that typical noise) for like 5 seconds without load before shutting down.
Is it possible that MGE calculated with the internal resistance of the battery when designing this UPS?
I found some details on this page: https://www.christidis.info/index.php/blog/33-teardown-and-operation-of-an-mge-nova-avr-600
According to this the resistance of the coils have 0,1Ω, so in theory 120Amps is possible with a very low battery resistance.
Does it make sense? Any ideas?
To make a long story short I attached a car battery to an old MGE Nova AVR 600 (360W/600VA) for testing to see if it can handle a single computer. When I disconnected the line power all transistors blew up as seen on the attached picture. I know it worked before, because first I tried it with an old unused car battery, and with that battery it was running (I could hear that typical noise) for like 5 seconds without load before shutting down.
Is it possible that MGE calculated with the internal resistance of the battery when designing this UPS?
I found some details on this page: https://www.christidis.info/index.php/blog/33-teardown-and-operation-of-an-mge-nova-avr-600
According to this the resistance of the coils have 0,1Ω, so in theory 120Amps is possible with a very low battery resistance.
Does it make sense? Any ideas?
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