Customer system:
15kWh BAE 48V GEL 2V cell battery bank
MultiPlus-II 48/5000/70-48
16Kw PV
We are running Dynamic ESS
I am seeing the loads periodically swing from “AC Loads” to showing as a negative value on the “Grid” this is NOT the PV feeding excess into the grid, when it does feed excess this does show as expected as a -ve on the “Grid”. What I am seeing is the actual AC loads swinging over and showing as a -ve grid value as opposed to displaying as a load.
In the attached image, over the displayed time period only 1.2kWh was exported to the grid. Looking at the widgets for “Input current” it is displaying as -ve as well.
Struggling to understand why, any insights appreciated.
Hi @ChiefSolar, no this is a domestic household, just the standard fare, its a large place, so three heat pumps, but only one in use during this time, several fridge freezers, several 2Kw fan heaters, and hot water. Cooking is all gas.
I’ve only seen this with inductive and/or capacitive loads, resulting in a lot of reactive power. However. My Enphase PV system with micro-inverter does something similar every morning when it tries to start up (I think that Victron measures the RMS). Seems unrelated since yours does this apparently at mid day..
@nickdb only in terms of being confident in the shunt data re the DC to inverter, and PV data looking correct, we will have someone visiting the site next week so will be able to confirm measured results then. Just baffling as to why the +ve to -ve load swings.
You can see in the VRM overview graph, where consumption columns are missing, they were recording in the -ve. It is worth noting, any true PV excess sent to the grid is being recorded accurately.
