I have many cases, where the customers complain about grid voltage fluctuations. In these place I would like to find a solution to use Victron as a regulator instead of a bigger standart voltage regulator.
Attached an example of a design, which I think should work.
In this design Multiplus No:2 is the main inverter, which supplies the loads.
It is AC and DC coupled and ESS will run on it.
However No:2 will only accept 'AC in' between tight boundaries (e.g. between 210 - 230 V)
Hence if there is voltage fluctuation for a longer time, and no sun, the batteries will go below minimum SOC level. Therefore another Multiplus is needed:
Multiplus No: 1 , this will accept weak AC and charge the batteries, which is enabled by No:2 with a relay signal, closing the relay K1. No2 will open K1 as soon as minimum SOC is reached.
My questions :
1. Do you see any problems with this setup ?
2. How does ESS react on such a case ? It will not know about the Multiplus No:1 but see that the battery voltage is increasing. Probably it will not do anything, as long as the SOC is at minimum ?
awaiting your comments.