reading more about issues with unbalanced legs
The unbalanced legs thing was based on a few people that failed to install the firmware updates and I think one guy online hooked a 77A air compressor to it and complained when it wouldn't run it. Another guy failed to follow the instructions, failed to install the updates, and kind of appeared that he was trying to make it throw an error on purpose.
With updated firmware, I think the Sol-Ark 12k can handle something like 4,800 watts imbalance before it throws an error which is an awful lot of imbalance in my opinion. The people that have updated the firmware and used some common sense in wiring their critical loads panel breakers have never had a problem with imbalanced legs. If you think about imbalance in a breaker box, any big load should be using a 240V breaker which rides both rails (bus bars) in the panel box so there's no imbalancing a 240V breaker (overload yes, but imbalance no). If you have 4,800 watts of imbalance it's due to your 120V breakers all loaded up on one side which I don't see occurring unless you're just not thinking when you wire up your breaker box, and/or you throw a lot of load onto as many 120V breakers you can that happen to be on the same side of the breaker box. For 4,800 watts, that would mean 3 toaster ovens running at same time it would handle if they were all 120V and had breakers on same rail. I can speak from experience, Sol-Arks technical support is very strong and willing to help DIY'ers. That alone was worth quite a bit. Anyone out there can correct me if I'm wrong and please do. Not saying you'll regret buying the SunSolar product because I know nothing about that brand, but I can say I have
never regretting buying a Sol-Ark, not once, and that's speaking on the hardware itself, as well as the 10-year warranty and technical support. I run a well pump, a bunch of circuits, and assist (cover 100% if sun is out bright) my main service panel which has 2 deep freezers, 1 fridge ,a 5-ton heat pump with A/C, as well as multiple other circuits in use for computers, TV, range hood, and 2 dehumidifiers all on ONE 12K. My grid connection drops to zero at 8am and stays on zero until about 6pm each day, and I top off 20kwh of batteries by 11am each day that discharge about 11kwh during the night.