Hello everyone! Do you know of any way to limit the amount of current the MultiPlus draws from the battery bank to power the loads? Because my battery has a discharge limit that shouldn’t exceed 55Ah (approximately 1350W, my system runs on 24V). I saw the “Inverter power limit” and “Maximum inverter power” options, but I’m not sure if this is exactly what I’m looking for. I can get around 1000W from the MPPT running, which I wouldn’t be interested in limiting, just the power drawn from the battery bank… I hope my question is clear! Thanks!
Supposing you did limit the battery’s contribution, from where would your system draw the additional power demanded by your loads?
The energy needed to power the loads would come from the electrical grid.
I’m considering implementing a function using Node-RED that, based on the energy delivered by the battery (measured by the SmartShunt), increases the “grid point” parameter when a certain power threshold is exceeded. This could work perfectly at night, but the problem is during the day, when the MPPT is operating. I don’t know how to determine what percentage of its capacity the MPPT is currently using, so increasing the “grid point” would reduce the energy demand, and the MPPT wouldn’t be operating at full capacity.
Alternatively, and perhaps simpler, you could get a bigger battery - one that matches the capabilities of your MP?
If you are on-grid use ess and set an inverter output limit.
Getting funky with an undersized battery and nodered is unlikely to provide a stable system.
The sizing guidelines for batteries exist for a reason.
Increasing the capacity of the battery bank would only be a partial solution, since if energy consumption increases, we would have to increase the capacity again, and so on… The only problem I see with implementing the solution using Node-RED is that I can’t find a way to determine whether the inverter is limiting the energy output from the MPPT. I’ve been researching it, but I haven’t found a solution yet.
I’m not arguing that you need more battery (Ah) capacity, I’m saying you need a battery that is capable of supporting the rated power (VA) of the MP system you have.
Why attempt to derate your system?