Why is my Victron MPPT Solar Charge Controller showing 0w (Zero Watts) output.

If your battery is fully charged as shown in the image above (13.55v Lithium) the solar charger will stop charging or will greatly reduce the charge current.

This is especially the case when at the same time the DC loads in the system are not consuming any power from the battery.

To find out what the state of charge (SoC) of the battery is, check the battery monitor (if present), or alternatively check what charge stage the controller is in. In this case Float.

Be aware that it can also be possible that the Victron solar charge controller thinks the battery is full, while in reality the battery is not full. This can occur when the charge voltages have been set too low, causing the solar charger to prematurely switch to the absorption or float stage. Refer to the user manual on pre-defined and user defined battery settings.

The only time you will see a Watt and Amp value within the Victron Connect App is if the batteries are in need of charging and being charged, or you have a load on the system.

In simple terms there is no place for the power to go, when you launch the App you will see zero. The small amount you might see is the small amount needed to keep the batteries at their float level much like a trickle charger.

If you put a load on the batteries, you will see the Watts and Amps increase as the charger converts more solar power to cover the load while maintaining your bank voltage.