ESS: Questions about

[cattus]

Thanks @Louisvdw

@Louisvdw

If your inverter can supply 800W of power and anything more will come from the grid, then to longer you can keep your usage to just under 800W the more power will be used from your PV and battery. So if you have a lot of loads using more than the 800W that will all come from the grid even if there is PV or battery available.

I find this to be exactly the opposite in my setup. My 1200VA inverter, when grid tied, rarely kicked out more than 200W, generally peaks at about 150-190W for fridge coming on-running once/hr, then runs for about about 15-20mins at 80W or so. Rest of the time it’s a computer, small load. And yet 58% of consumption came from the grid…hence my head scratching!

In fact, based on discussions had on this thread My Inverter's Capabilities...confused? - #12 by cattus I get the impression the ESS works as a support to the grid supplying the loads. Which leads me to think that if I attach my Installation to a large load (managed during the day eg heating geyser between 10am-3pm) I may then get more out of it. I may have misunderstood though.