All guides · Batteries and charging
Yes, multiple charging sources can work on the same battery bank when the system is planned for it. I would especially check the total charging current, the battery's charging profile, and how all sources react if the BMS requires a shutdown.
Start by naming the charging sources
Here, the generator refers to the engine's alternator. It can charge the service bank through a suitable charging path, for example, a DC-DC charger. The solar panels use a solar charge controller, while shore power supplies a battery charger. A separate 230 V generator is a different situation: switching between it and shore power must be handled by a suitable transfer switch.
Make a list of the model, maximum output current, and settings for each charger. The battery manufacturer's data is the common starting point. It does not help to choose a suitable charging profile on one device if another is set incorrectly.
Calculation example: three sources at the same time
Assume 30 A from the DC-DC, 20 A from the shore power charger, and 15 A from the solar controller. That provides a maximum of 65 A from the chargers in this example. If the boat is simultaneously using 8 A on the same DC system, the net current to the battery is approximately 57 A.
When the consumption stops, the full 65 A can go to the battery. Therefore, I would check the current limit with low consumption, and not dimension based on the refrigerator or other appliances always being turned on.
Same voltage does not mean same work distribution
You cannot expect all chargers to deliver their rated current at all times. The sun varies, the battery approaches full, and the chargers' regulation can result in an uneven distribution. Use measurements to see what is actually happening, rather than adding up the rating plates as a promise of charging speed.
What can central control do?
Victron DVCC can, in supported systems, coordinate voltage and charging current on compatible, connected equipment. This requires correct setup and compatibility. A charger outside of the control loop will not be automatically limited just because a GX device is installed.
I would have three situations documented: all sources active, full battery, and charging blocked by the BMS. With lithium, the solution must also handle the battery's temperature limits. BMS disconnection should be protection and not the normal way to regulate an oversized charging system.
Sources and manufacturer documentation
Manufacturer documentation checked September 2026. Always follow the manual for the specific model and installation. The calculation examples are simplified examples for planning purposes.
Moving forward with your solution
Send the battery model and the names of your chargers, and I will help you get an overview of the interaction.