hi,
Im setting up a new ESS and have what i believe is a slightly non standard setup and wondering if there is a program or matrix or smart calculator to allow me to achieve what i want without all the trial and error or reinventing the wheel.
1. What i want to achieve is to minimise grid usage (i.e. my monthly electricity bill), maximise grid feedback (monthly rebate) and never be completely without battery power in case of a power outage which does happen a couple of times a year.
2. my setup is 6kw wind turbine in a very windy location
20kwh lithium batteries (hope to double capacity soon)
quattro 15kva inverter, cerbo gx, bms etc (will add a small generator for backup eventually)
solar coming soon but i'm in ireland so i'm not expecting solar to be fantastic!
2 houses running everything on electricity ie hot water, heating etc, a polytunnel, a 9KW sauna and an electric car
3. where it gets complicated and where i get stuck is on the configuration. Here's why:
our day rate to purchase electricity from the grid is 0.40c/kwh
11-2am and 4-8am its 0.178c/kwh
2-4am its 0.10c/kwh
feedback rate earned 24/7 is 0.21c/kwh
So the q is - how do i optimise the ESS so that it automatically gives the best bang for my buck? For example i know that the best time to charge the batteries is from 2-4am and then run them down during the day when the rate is high. But the ESS will naturally take power from the wind first, which i don't want between 11-2, 2-4, and 4-8, because i make more money selling back my wind power during those hours. and if the batteries go below my threshold of say 15% at 7pm and there's no wind, they will start charging up from the grid, which is not really necessary and it would be better to wait until 2am for the cheap rate, although it might be good to just charge them a little, say 10%, in case the grid goes down. And then there are capacity limitations. I only have a 63a main fuse, so it may not always be possible to charge my whole battery bank in 2 hours for example if the car charge is also in use.
Lots of options, lots of possibilities, but surely someone has already done this and theres a config file i can copy paste or an excel sheet to enter all my variables and have it spit out the answer?
thanks!
