Export to Grid ignores Battery Setting

chris_m

This is my first day of using Wonder Watt so it may be I have not understood the 'Export to grid' when 'Battery is at least' parameter. I have a GivEnergy system and configured Wonder Watt to Export to Grid during my defined time, setting the battery level to '50' (I assume that's 50%, although no unit is specified on the screen) and solar forecast at least 5kWh.
The export commenced as expected, starting with a 100% charged battery and solar panel generation. However the battery continued to drain below the 50% figure and, once the timeslot completed (7pm), the battery was fully drained. This means I will now be consuming energy from the grid until tomorrow. I'd appreciate advice as to whether I have made a configuration error, or if this is a software problem.

admin

chris_m Thanks for joining Chris. 😃

You can read more about this in the thread here: https://community.wonderwatt.com/d/9-thoughts-on-export-session-and-possible-improvements/2

Long and short of it, GivEnergy currently does not support a stop discharging at % - but as described in the thread above, we will sort out a solution for GivEnergy users.

Does that make sense?

chris_m

Thanks for your reply and the link to the thread. It's a shame GivEnergy lacks this facility. I think, for now, I'll disable the timed export via Wonder Watt as it has led to me using the grid for the first time in several days due to the battery being charged overnight (albeit at the Octopus cheapest Flux rate).

Gazzagreen

chris_m
What I do is just export the battery for 2 hours between 5 and 7pm. Using a 8.2GB battery this exports about 60% of the battery, from 100% it leaves a little over 40% for evening use. You can experiment this way until you get what you need.

The battery level setting tells the software what level the battery has to be at to start the export. I have mine set to 95 which means if the battery is below 95%, it won't export. It's always 100% though at this time of year so NP.

I have temp set at 1 so it always works no matter what the weather. After 7pm there's not much sunlight anyway so it's not important.

Hope all this makes sense.