Hi There,
In my motorhome I have a Multiplus Compact 12/2000/80-30 230V running on a 300Ah Lithium battery.Also a Buckboost (50A) to charge the lithium while engine is running.
Starter battery is a "normal" one that was already in the car. (I think lead-acid, or AGM)
When I connect the TR-Charge output of the Multiplus, I can measure a small current even if the charger in the Multi is not connected to shore power grid.
Even if the multi is switched completely off, there are e few milli amps floating to starter batt.
Is that normal? I thought the two cicuits (starter and leisure batt) are isolated? Normally it should only load the starter, when shore power is connected and the charger in the Multi is running?
When I measure the output voltage of the TR pin there are about 13V.
Could it also be possible that current flows back from starter batt, when the voltage is higher there, than in leisure batt?
thanks for your help!