Technical Support

I am about to set up a 5.5kW inverter with a 14.5kWh battery (no solar) to take advantage of a 7 hour cheap rate night tariff in a domestic environment. I just want to confirm the setup will operate as I want it to before committing money.

During the day there should be no issues, the inverter will be set to power the house with zero export  to grid. The estimated the usage will be 8-9kWh for the day. The only grid power being needed when the shower (9kW) is in use.

At 00:30 when the low rate period starts I see I can set the inverter to start charging the battery from the grid. Am I correct in thinking this will automatically stop the unit from providing power to the grid so the house is now grid powered ?

I intend to limit the charge power to about 2 kW. I assume I can do this by setting the maximum charge current to 38A. The battery should be charged within 5 hours and I also assume it will stop charging then. What I am not sure about is what happens at this point. I would not want the inverter to resume powering the grid output from the battery as the washing machine may still be on and the car will almost certainly still be charging as I limit that rate to around 5kW. Do I simply set the charge time to go off at 07:30 or do I need to specify when the inverter is to supply power and when not to?

Also, how accurate is the clock / timer on the inverter? I do need it to stay in sync with the economy 7 time period, long term. Has anyone found a way to externally control the inverter functions?