export/import automation to maximize the cost efectiveness #282
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Hi, the basics are quite simple. I'm not claiming it is 100% what you want, but this should give you an idea you can pivot from... 1 + 2. Discharge to grid: I'm only looking at spot price for any given day (no look ahead yet). I have a few other values to check - PV forecast, spot price values to make it worth and dates of interest. You then wait for the spot price to go below certain value and repeat the steps in reverse. It is handy to set up some notifications for the major steps.
You need to set the inverted to discharge mode, set 'Eco mode power' to at least 1% and set the value 'Grid export limit' to a value your grid operator allows you to. There is one caveat though, if your PV is not able to sustain household load, it will buy from grid (and not from battery), so you might want to built in some other checks. Negative spot price: I'm turning on hot water boilers first (you can tweak it to turn on AC, sauna etc) in order to consume energy in-house and minimize export to grid without setting the grid export limit switch (inverter uses ~0.1kWh by doing if the limit switch is on). And only when battery reaches 94% do I turn on the grid export limit switch.
Conversely, same can be done in winter times... HTH |
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Thanks! problem is, that I wanted to prevent spamming the invertor with settings, therefore I'm checking first the current state, and then I set the new one. I'm also setting the battery export limit/power according spot price and battery charge %. Automation also looks into times, what the user have set up, if it's in the sell times or not... the whole schema is quite wild :D
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oh yeah, it can get complex pretty fast, esp. as you say you don't want to 'bombard' inverter with setting requests and you want to make sure it is robust without many obvious mistakes. Btw, I have an elaborate setup about battery level states based on month of the year (winter only), where I take into account PV forecast and set the dampening values based on weather forecast (factoring in cloudy, rainy, snowy weather), to arrive at a desired battery level so I avoid charging it too much.... The only thing I'm missing so far is some conditional loops to allow to factor in how much I consume in-house/send to the grid so I can turn on devices such as hot water, AC, sauna to shave off the load. I think I will have to look into NodeRed for this... |
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yeah, NR is ideal for this, but it's also complicated in the beginnings to learn it |
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Hi,
I have an idea, but have absolutely no clue, to to create such automation. (in HA or Node Red - doesn't matter)
What I need:
for Summer:
1.) look at the spot prices of today / tomorrow
2.) if there are negative spot prices from ie. 13:00 - 18:00, sent every created energy from panels directly to the network, from early morning - to get best money from it
3.) when the negative spot price at 13:00 occurs (lets say -110eur/MWh), drain energy primary FROM the grid (to charge the battery and for use and to earn money)
4.) if there is only minimal negative spot price (ie. 40 - -40eur/MWh) use energy from panels
and second automation would be
for the winter time:
1.) look at the current and next day, get the lowest spot prices, and charge the battery during those times.
Is anybody here who could help?
Maybe there is already some automation for this out there, but I couldn't find it.
many Thanks
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