Export Settings

jjb

Hi. I have tried to set up the export settings in wonder watt to maximise export from the battery at peak time with the following settings:

From: 16:00
To: 19:00
Export to Grid: Ticked
Battery at least: 40%
Solar forecast at least: 2 kWh
Stop export at 40%

The setting seems to be kicking in and correctly exporting until the battery hits 40%. However once the battery is at 40% it does not return to powering the house. It looks like we start importing electricity until 19:00 when the battery kicks in again.

I am not sure if my settings are incorrect or if this is expected behaviour.

Any thoughts appreciated.

MartynK

Yes this is expected behaviour (assuming Growatt). Once the battery is discharged to your chosen SoC, the time window will result in Grid First mode being maintained until the time window ends.

jjb

Thanks for confirming. One possibly for the wonder watt team to add to the wish list for future development. I would have thought most people would want to discharge the battery to the given % and when reached to go back to battery first. As it is I have just reduced the export period to 1 hour which should do the trick.

Gazzagreen

We don't have the stop at a certain % for my Giv energy inverter on Wonder Watt. So My ingenious solution is to start the export at 5pm and allow it exports at full power for 2 hours until the 7pm end time. That generally exports between 50 and 60% of the battery. I set the charge level to begin at 95% or higher so that the battery has to be almost full before the export will happen.

This all worked very well in the summer, but now it's starting to use more battery on heating the house, and there is less solar, it doesn't export as often. But in winter you don't want it to export anyway, do you?

nbullus

I had the same issue with GivEnergy battery. It stopped exporting from the battery, but then immediately started drawing it back from the grid at a higher price than what I'd just exported it it. If this is how the automation is meant to work then I won't bother using it as it ends up costing you more money instead of saving you money. There should be a second automation that kicks in when either the reserve SOC is reached or the end time is reached (which happens first) and then restore the settings. Or at least give the user the option of doing this.