$22K ($22.8 actually) for 16kWh was just the hardware purchase price. You then have to pay shipping via freight (which isn't much in comparison) and then have someone licensed/certified by Sonnen install it. I was quoted $1500 for installation. So you're basically looking at ~25K for 16kWh installed. LG dropped their prices to be more competitive about a month ago it seems. Sonnen needs to do the same.
The good news is that I've found a source for the LG batteries. Apparently LG is now only supplying these to resellers on an as needed basis (no shelf stock basically) to be installed as part of LG approved systems. Basically, the reseller designs a system and LG approves it before sending the battery. The good news for me is that a few DIY shops were stocking the batteries before this change. A couple still have stock left and have no problem selling them.
@doubleohwhat did you get the LG chem and storedge system? I currently have the storedge inverter for my Solar and the LG chem batteries seem to be more available now. Also the certification process is very easy (20 question). Tesla doesn't have any certified installers in Michigan, and Tesla is complacent about getting installers certified, so LG chem may be the fastest route. I'm getting tired of power outages.