Today, the battery voltage is dropping. The RV is plugged in and the 120v Christmas lights are on. I dont think i hear the normal hum/buzz of the battery charger...
Circuit breaker... When I came home last night, the indoor/outdoor led Christmas lights were out. Rained all evening here. Guessing it was the light string.
Check the battery for fluid level, excess heat or 'boiling'. Assuming the battery looks fine, disconnect one cable and check voltage of the 12v system and check battery voltage after a few hours or next day. Post the results.
If it's a three stage converter/charger, the voltage will indeed change from day to day. To know what's going on, you need more than just to hear the hum from it, You need a volt meter. We also need more information like what RV you have etc.
