Hi! I have a Victron BSC 12/10 charger connected to the starter battery in my Ducato. Is it normal that during charging the status keeps jumping: bulk - absorption - bulk …?
To rule out any issues with your cabling;
Get your multimeter, put the negative probe on the negative battery terminal, and then check the voltages from the charger down towards the battery, i.e
- The charger + terminal
- The busbar + if you have one
- The battery breaker terminal on the charger side
- The battery breaker terminal on the battery side
- The battery positive.
Even with the charger cranking, these voltages should all read within about 0.1v if you don’t have much wiring, your cables are the right guage, and connections are tight.
Now repeat with your positive probe on the battery positive terminal, and your negative probe on the negative versions of the list above.
This will rule in/out any cabling issues between charger and battery.
An charger or mppt that jumps to float sometime indicates that the battery is disconnected, or at least has a lot of resistance between charger and battery.