If the battery system depletes sufficiently thereby triggering the Multiplus to switch to grid and start charging, and providing agreeable sunlight, the MPPT will equally try and charge.
from a safety aspect, it would make sense to ‘say split’ the maximum charge currents 50% each, but at night this would be waste.
I there any way of implementing a rules-based system that would allow the maximum charge current to increase / decrease depending on current MPPT output?
Many thanks
Are you using the ESS Assistant?
When you enable feedin from dc, the mppts will always work at their maximum power.
So, if you configure a CCL (Charge Current Limit) in DVCC then, the multiplus will give precedence to the mppts, and only charge the missing amount to reach CCL.
If you disable dc feedin, the mppts can be throttled to obey the setup CCL in total (multi + mppt)
I didn’t test this, but I would guess that solar takes precedence over the multis in this scenario as well.
Correct it obeys battery charge limits and will produce to cover loads as well when the battery is full with ESS assistant.
I do this for my 12v system. It supports my 5000 multiplus with 1200va. I let it run down to 50% SOC I have 2x 12v 340ah batteries. The max charge current of the multiplus is 50amps and I have about 900w peak of solar which charges at 65amps max. I have used node red to get the battery soc and adjust the charge current from 70 amps down to 20amps using DVCC. The DVCC does not do anything to solar charge current. The Multiplus will charge if there is not enough current from solar, for example, if the battery is at 55% and there is only 25amps of solar because it’s cloudy then it will take power from the grid tie system and increase the current. It works really well.
Many thanks!
May I ask which device you use to administer the parameters: Color Control GX or Cerbo GX?
It’s a Cerbo GX with the large image installed to get access to node-red.
