PWM disables charging battery after heavy load on inverter
You can't charge the battery while drawing power from it at the same time It isn't like a bucket of water where you can dump in on one side and suck out on the other. It is more like a T-intersection on a pipe where water can only flow in the middle pipe in one direction at a time. But you can draw power from the charger to power your load and charge the battery at the same time. Your charger can't supply 1000W to power your load so it shuts down to protect itself and the battery ends up powering your load instead.