I notice that the battery charges from the grid above the minimum SOC with a KWH quantity that is about the expected consumption (minus expected solar charging) .
In case the consumption is more then expected, the system starts charging from grid immediately resulting in expensive charging tarifs.
I would suggest to change the algorithm so that the charging from grid could be more than min. SOC + expected consumption so that a reserve charge is maintained.
If this already possible I am interested to hear how this possibility can be set.
Are you using ESS? It seems what you are describing is what ESS optimized without battery life does?
Hi Fideri, Thanks for your response.
Yes i am using ESS, and without optimized battery life. If you have suggestions to optimize this situation Please let me know.
Greetings
Onno
I might have misunderstood what you are saying. With ESS optimized without battery life, I think normal behavior is:
1 - Batteries will only charge from AC below minimum SOC, say 20%
2 - Batteries will not discharge below min SOC, unless grid fails. All loads will simply be cut off.
3 - If there is PV power left over after powering loads, the batteries will charge from PV up to 100% SOC. If there is no PV power left over, batteries will charge from AC power until 5% above min SOC, so 25% SOC in my example. During this time, loads will be powered from the grid, since the Multi/Quattro can’t invert and charge at the same time. Above the min SOC + 5%, the batteries will start discharging again to power the loads.
4 - At night time or when grid is unavailable, the batteries will naturally power the loads. (When present) available PV power will go to power the loads and any left over to charge the batteries.
5 - On your issue specifically, only batteries and PV power will serve the loads above min SOC. If batteries have dropped below min SOC (there was no grid) and there isn’t PV power left over to recharge the batteries, the batteries will be charged from grid as an emergency until min SOC + 5%
If you don’t want the above, have you tried scheduled charging? As you can imagine, it has disadvantages.
Also, I assume you are using both AC out 1 and AC out 2 and you have power from batteries “all system loads” in ESS selected?
I must say I don’t have ESS at the moment but I’m actively designing such a system so my understanding could be inaccurate.