Hi I have a problem with an axpert 5k mksii, it works fine without batteries, but when I connect the batteries I have fault 52. What can I check Mosfet and resitor like on KS model?

Does anyone have a service manual to send me?

Thank you

Edited October 15, 20205 yr by Fenner

Fault code 52 (error 52) is bus voltage too low. You could start by getting what the inverter thinks the bus voltage is, and compare that with a multimeter. The bus voltage appears in the response to commands such as QPIGS. It might also be available from Watchpower or other monitoring software.

Edit: I don't have an MKS II service manual in my collection.

Edited October 15, 20205 yr by Coulomb