Most likely a MagTec brand converter
Something like maybe a 6130
The model number will be listed on the paper stuck on the inside of the flip down door where the fuses are
This will be 30 amps max, and may only have a 6 amp trickle charge, depends on model version
This must have a good battery properly connected to work correctly
The battery connections up front on the battery, will fool you
White is negative/ground , black is positive/hot
Your inside lights won't care, but the water pump well run backwards, when on battery only no shore power, the converter won't work correctly with the battery connected wrong, it will damage the battery