I have a question for the PV and EV people with a home-automation kink 
More specifically, I'm thinking about a good power/charge distribution strategy between generated power, house battery, ev battery and some switchable power consuming devices. Are there any examples and good ideas to follow? I need a few inputs to get started.
Surely someone must have done this before.
FYI, I'm using OpenHab, but that is not the point. General strategies would be fine.
teilten dies erneut
toddmedema
Als Antwort auf AndiS 🌞🍷🇪🇺 • • •I have a very automated house w/ Tesla solar + powerwall + model Y, but since we're hooked straight up to the grid, haven't had enough of a need to set up any direct automations.
We do have Time of Use rates, though, and I have posted signs saying to run async energy hog appliances (dishwasher, clothes washer and dryer, EV charger) at non peak hours. Might be a bit hard to automate those directly unless you had smart appliances with an API to start them.
Also heard an interesting point that HVAC is basically a battery, storing energy as heating/cooling in the house. So another automation could be to crank up the heating/cooling when there's abundant power.
AndiS 🌞🍷🇪🇺
Als Antwort auf toddmedema • •@toddmedema
Heating/cooling is pretty straightforward, especially since there is some lag in the system and you "can" for the most part run it when solar power is available. In that respect you can really look at it as a sort of storage, with the difference that you cannot use the stored power later and for something else.
Complexity arises when you have energy production and multiple "sinks" to chose from. House battery, EV battery, selling electricity to the grid...
In my case I want to maximize self-use of energy and only put into the grid whats left. But it is still a hard problem to solve. I do have many Ideas on how to tackle this, but seeing an already implemented strategy or thoughts of others would still be tremendously helpful!
Dishwashers etc. I have set-up as you describe. Just turn them on manually when appropriate.
#solarpunk #ev #pv #energy #homeautomation
rawe
Als Antwort auf AndiS 🌞🍷🇪🇺 • • •there are services like https://forecast.solar/ to obtain a forecast so its possible to use this to decide if it makes sense to store the excess energy to a battery (can be used for something else tomorrow) or to use it for something else directly.
Im interested in this as well, as I manually implemented some control loops. I got switched outlets that turn on in case of excess power with things like a pedelec battery charger or a small heater or dehumidifier connected. Prioritizing those outlets and avoiding switching them on and off every few minutes is not straightforward.
Right now I dump excess energy in "would be used anyway" appliances like the pedelec battery charger, dishwasher, (and the base load that is there anyway) ... Next level is to buffer the energy for later use in a battery. If there is still some excess energy it goes to "nice to have" applicances lile a dehumidifier. All thats left goes to the grid.
Forecast.Solar
forecast.solarAndiS 🌞🍷🇪🇺
Als Antwort auf rawe • •Thanks, I have already been looking into forecasts too but decided against using them at the moment.
It would make sense for sure, but complicate things even more. So this has to wait. But if anyone has a good solution there too, I wouldn't complain
#solarpunk #pv #ev #energy
Paul Barnfather
Als Antwort auf AndiS 🌞🍷🇪🇺 • • •AndiS 🌞🍷🇪🇺
Als Antwort auf Paul Barnfather • •No, automating that will make it exponentially more complicated.
I'm fine (for the moment) to manually select an appropriate charging strategy. What I'm looking for are examples of such strategies that people are already using!
Like: "On a Sunny day first charge the house battery to 70%, then ramp up car charging as excess power permits..."
#solarpunk #ev #pv #energy