Immediate battery depletion

[kernnowkarmann]

Just parked up and put heater on. When I turned the control unit on it it read battery at 100%. I haven't plugged the van in for a couple of months as not camping and so it charges from driving about.

I put the heater on level 4 for about 5 minutes and it said drawing about 11amps. Now switched it to level 2 and draw has dropped but after only a few minutes the battery is showing 60%

Is thus normal? Thanks all. Still learning lots!

 

[kernnowkarmann]

Few minutes later, turned heater off, gone up to 70%

 

[WelshGas]

Just parked up and put heater on. When I turned the control unit on it it read battery at 100%. I haven't plugged the van in for a couple of months as not camping and so it charges from driving about.

I put the heater on level 4 for about 5 minutes and it said drawing about 11amps. Now switched it to level 2 and draw has dropped but after only a few minutes the battery is showing 60%

Is thus normal? Thanks all. Still learning lots!View attachment 102846

The % readout is an “iffy” calculation based on current draw. If you leave it running on Level 2 the voltage will probably climb and the % change.
It is the Voltage you should rely on and only take notice of that when it has been in a steady state for at least 30 minutes or so.