Hello-
I am in the US and have a split phase 240v system that is based on two Multiplus 48v/3000/35-50 120v units. Solar panels only, no windmill, generator, etc. My system is connected to the grid, however I do not want any backfeeding into the public grid.
Question: Should I be using the VM-3P75CT, or the EM-24? Other possible options I am missing?
Thanks in advance.
The Victron grid meter is faster to react than the EM-24.
I use EM-530s with separate CTs, which are also faster.
I can guarantee you with ESS that there will be 1-2 seconds of backfeed to the grid when a heavy load switches off. It isn’t physically possible to be fast enough, regardless of which meter or inverter you use when fully grid-interactive.
Rick is correct. I’m also in the US and there’s no way to use ESS without transient backfeed (unless you only have steady loads that slowly turn on / off).
I appreciate the advice from both of you. Are there any other good sources of practical information regarding deploying Victron equipment in grid connected systems in the US? Thanks.
The only legitimate way to do so is without ESS installed.
Not that I am aware of, but I would be pleased if someone does know.
I’m running ESS only because my utility meter is ancient, so it cannot detect the momentary backfeed with ESS. When the PoCo upgrades the meter, I will have to fill out lots of forms and modify my service agreement, or abandon the ESS assistant.
Victron is no different than any other brand hybrid inverter that synchronizes to the grid and can supplement grid power (or sell it back). They all inadvertently export power because it is impossible to be infinitely fast reacting to load changes.
It comes down to power company rules. If they require UL 1741SA or SB, Victron won’t be in compliance because Victron has not setup a grid code for North America. If they just want UL 1741, there are now multiple Victron devices with that certification.