Recently purchased and installed MultiPlus-II 48/8000/110-100 with Freedom Won 5.5 kWh battery all connected by a Cerbo. All Victron firmware is latest, v2.94 and 502. (I don't yet know how to check/update the Freedom Won firmware; I'm in communication with the company.) Settings as given on https://www.victronenergy.com/live/battery_compatibility:freedomwon, except that for a while I had the ESS mode as Keep batteries charged rather than Optimized (with BatteryLife).
When set to ZA grid, the Multi correctly acts as a UPS when I kill the AC in at the breaker. However, the Multi shuts down and restarts during a loadshedding event. This behavior seems to be seen elsewhere, https://community.victronenergy.com/questions/61136/how-quickly-should-ess-switch-to-batteryinverter-w.html and https://community.victronenergy.com/questions/157619/victron-multiplus-ii-not-switching-correctly-to-in.html and https://community.victronenergy.com/questions/77975/slow-ups-on-multi-ii-5.html; people seem to say that the problem is that the grid fails too slowly, more of a brownout where the voltage drops, but not very quickly.
Following the suggestion of some of the above links, I changed the grid to Other and manually set the AC low cutoff to 215V. For the most recent loadshedding event, the Multi shutdown and threw a Low Voltage battery alarm (at 55.84V (?)). Prior to the loadshedding event, AC out draw was low--max could've been 2kW but was likely more like 250W.
I have two questions: 1) in https://community.victronenergy.com/questions/61136/how-quickly-should-ess-switch-to-batteryinverter-w.html, @Daniël Boekel (Victron Energy Staff) suggested changing the grid code to None (and thus no ESS). Since https://www.victronenergy.com/live/battery_compatibility:freedomwon tells me explicitly to use ESS, should I change settings to try grid None and no ESS? 2) are there other idea(s) for thing(s) I can do to get the Multi + battery to work as a UPS during a loadshedding event here?
Thank you very much for your help!
EDIT: I see that when loadshedding hits, I get simultaneously a Low Battery L1 and High DC Ripple warning/alarm. Also, adding from a comment below, the system shuts down even on very low loads, most recently when the load was only 108W.