I talked to a Sol-ARK vendor and they are unsure if the SOL-ARK has the ability to power the loads from the battery on a schedule (I.e. set loads to get power from Batteries only from 2am-7am). Do you happen to know?I can run my whole home with the 12K Grid tied and my bill was really high as Irun a salt water aquarium is alone consuming about 20KWh per day. I have 16KWh of batteries and 10.4Kw of Panels hooked up to the Sol-Ark. If I had 30KWh of batteries like you I would have probably gone off grid.
It's a thing of beauty to watch the Sol-Ark in action, it uses just PV as long as the sun is shinning, if clouds come over it will use the batteries along with the lower PV output to jointly power the house. When the clouds pass it will use the excess PV power to charge back the batteries first and then sell to the grid second (if that option is selected). If the power goes down it will transfer to Solar/Batteries within 4ms so its almost impossible to tell when there is an outage. The only way I know is that the phone App sends me a push notification.
At night I can schedule battery usage times and the max KW it can draw during each period, anything over that max and it will supplement it with grid power. So if by chance three compressors kick on at the same time and it needs more than the 2.5KW that I set and lets say it needs 4.5KW it will draw 2KW from the grid for as long as needed. You can also set it to Grid charge the batteries during certain periods or if the batteries reach down to a certain level. During a power outage the limitations in scheduling will be bypassed and it will use what you set as the maximum draw from the batteries as the limit. If for some reason the unit trips and I have only had this happen once when I was testing the limits, the unit will reset itself in a minute and go back to normal operation.
I am still using Grid power for about five hours in the evening using the scheduling feature but the remaining 20% of the bill is reducing rapidly as we change a few of our habits to get more things done in the daytime. If for some reason you need more power I understand that Sol-Ark will be releasing a 15K unit in a couple of months. I don't really agree with some of the posts saying to get a low freq inverter with a big transformer. Yes they are really good at starting heavy loads but they are also very inefficient when compared to transformless models.
I am an EE and designed the wiring and layout plus installed most of my system myself. I am not into DIY solar as a hobby as I have lots of hobbies already. What I needed was reliable power and just wanted a system that is straight forward yet extremely customizable.
Sol-Ark pretty much ticked all the right boxes for me.