I finally got the Growatt 12kw installed. It was supposed to take 2-3 months for it to arrive, but Grace Zhang, the girl I ordered it from kept watch on Growatt and she was able to get one earlier and had it shipped. I found her on Alibaba at Xiamen Sweet Power Tech. They are a Chinese distributor for them that serves Asia, but she sends them to The US and Canada as well. She was easy to work with and easy to understand and checked back with me regularly. They accept Pay Pal and credit cards no extra charge. They offered the 12kw Growatt Split Phase Off Grid inverter for $1700. including shipping. I paid almost $4000. for that stinking Aims that never worked right. This one works great! It was easy to program changes I wanted, I'm not using the built in solar charge controller, I just connected it to all my batteries and left the existing charge controllers in place. It has a setting for battery priority so it only sees the charge of the batteries and works fine that way. It connects to their Shineserver so you can monitor it online and on your phone. So far my experience with the 2 Growatt inverters I have is 100% positive. From now on any new inverters will come from Grace and Growatt. That's about it, the dog