Hello
We have bmv 700 battery monitor fitted on our narrowboat it's been situated on the boat for about 3 years without any problems. But just recently the BMV 700 and mppt controller battery voltage readings have differed greatly when using the blootooth to read them both. The bmv 700 does not show the correct battery voltage either when a genny or the engine is running it remains at about 12.80v where before it used to show 14 v or thereabouts. I'm thinking the pcb on the shunt may be at fault for the incorrect readings. Can anyone help please