I was originally considering an all-in-one system for off-grid but then began to be concerned about the fact that the inverter and charge controller(s) are all in one unit. Are people going to have to send the entire unit back for repair? In an off-grid situation not having a back up in place is too risky for me so it makes me think having a separate inverter and charge controller(s) may still be a better option to prevent a single point of failure for the entire system. I was interested in the Sol-Ark especially because of it's charge controllers supporting 500V PV arrays but am veering away from this now. Thoughts?