po3mah,
@po3mah@mastodon.social avatar

After 2 weeks of using #balkonsolar (#plugin #pv):

  • Currently it is providing around 5% to my daily consumption, which is not much. It's December and the heatpump is running hard.
  • The biggest challenge is to prevent export to the grid. The sun is shining when the consumption of the house is the lowest. Currently I am preventing it with some #homeassistant automations, which turn on dehumidifier (which I use for drying clothes) in a laundry room or a boiler.

How do you prevent el. export?

PattaFeuFeu,
@PattaFeuFeu@chaos.social avatar

@po3mah I don’t. I optimise for usage in times of yield to a reasonable level* but if some power is exported, so be it.

*dish washer, washing machine, charging devices I would have charged that day anyway. But no unnecessary consumption just to not export anything.

po3mah,
@po3mah@mastodon.social avatar

@PattaFeuFeu Thanks! Excatly, I'm looking for ideas what else to shift to sunny time.

Andrew,

@po3mah do you have an electric hot water tank? I've heard of strategically running it more/hotter when you have surplus power. Almost works like a battery.

po3mah,
@po3mah@mastodon.social avatar

@Andrew Yes.
If HA detects el. export and if temp<45C, then turn on heatpump, which heats the water.

But sometimes the temp of water is too high to trigger it ('energy battery full').

Therefore I'm looking for additional ideas.

po3mah,
@po3mah@mastodon.social avatar

@Andrew BTW it's not much 'leakage', I already consume 90% of produced electricity. But now it's winter and in summer it will be worse (less consumption and more production).

Andrew,

@po3mah oh ok that's cool! I wonder if you could do something similar with a refrigerator. Maybe have it powered off for an hour or 2 before solar kicks in to save grid usage, then it would "catch up" on cooling with solar. Would have to watch fridge temperature of course.

BlueTurtleAI,
@BlueTurtleAI@hachyderm.io avatar

@po3mah I’m not an expert, but I assume you can’t prevent it. When you don’t consume electricity it will be exported. You could use a battery to minimize exports.

po3mah,
@po3mah@mastodon.social avatar

@BlueTurtleAI Thanks, I didn't mean 'prevent' literally.
I meant 'how do you automate - increase consumption' to avoid export (without batteries).

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