My system is used solely for timeshifting electricity, no PV. I want to ensure that during scheduled charging of the batteries, that AC loads on the grid do not exceed my grid connection fuse rating of 100A. During cheap rate I can have a very large load on the system - ESS battery charging, car charging, water heating, washer/dryers operating + normal household use such as heating. When loads are not close to the limit, I don't want the ESS system limiting its charging rate, when loads are approaching the limit I want the ESS to moderate its charging rate to ensure the 100A limit is not breached.
I have an ESS configured using 2x Multiplus II 48/5000/70-50 in parallel and a Pylontech stack with an ET112 energy meter. Most household loads are on AC1 In. I have the grid set point at zero to minimise feed-in during the day. My input current limit is set to 50 to ensure the feed cable rating to the Multiplus is not exceeded.
What I would like, but do not see a control for (ideally I'd really like to avoid complexity of having to employ external control with ESS mode 2/3 or node red et al), is a "grid limit while charging" parameter in the schedule charge settings.
I have looked through other previous questions and don't see and obvious straightforward way to achieve this. I'm a bit baffled why such a seemingly important feature for safety and reliable operation for timeshifting is not available as standard. Perhaps i'm missing something fundamental, or my understanding of some of the settings is wrong?
What can I do to set a maximum grid limit without compromising charging performance when safely under that limit?
Cheers, Paul.
