Bigger inverter. Indeed. I downsized due to inavailable stock on a 1600VA inverter from another brand. 800VA from Victron will do 800VA until it overheats and then it will drop the voltage ... if the load responds by increasing current, it trips. The cheap 1600VA, reviews see trips outs frequently for half of that. Victron 800VA is thermal, but "realistic temps" and smooth derate. cheap brands, a 1600VA will probably not even run 800W for longer than 5 minutes before it overheats and trips. (Small/multi transformers, dozens of mosfets and parallel inverter sections).
So I got the right brand, or rather I spent the right amount. Half the VA, same price, thus better quality.
i 'should' have put the purchase off a month and bought the bigger victron 1600VA Only £250 more..
the most annoying thing ... I cannot run the coffee machine on it! In fact, outside of the office and the multitude of small consumers ... all my loads are momentary, short term and 1.5-3kW.
I am weighing between, going self "project funded/managed" and source my own parts and labour to extend this system onto the main roof for solar panels ~3kW and into 10kWh+ of DIY lithium + 4kW hybrid inverter.... then try to get that "notified" by an expensive spark (Like andy's off grid garage)... or... put a normal "package deal with finnace" grid tie system up there with 0% finance (hopefully) and ... keep the two separate... although ican run the battery charger on the "off grid" system when there is "house solar" available. An anti export cross feed if you will.