Kodemonkey
Member
Unfortunately, I suspect most inverters already in place don't scale back their production using FSPC, but just shutdown for a bit and then try again, and I am sure you know that! That is certainly my situation. As to dumping solar energy, the object is not to "waste" that energy but to use every precious bit of it during a power failure. In my case I have a resistance heater in one of my water tanks, that are normally heated by my geothermal system. I typically turn off the geo during a power failure, although, given the installed soft start device, it will run off of the Powerwalls, just not for long. The resistance heater allows my to use excess solar energy more gently, e.g. at 5 kW rather than 8-10 kW. Heating water is not wasted energy, but even 5 kW is too granular for managing solar over production. The Tesla coordinated charging scheme is perfect for keeping the batteries at 90 or 95% as long as the sun is shining and not allowing solar energy to be wasted or not used. Of course when the car hits 100% SOC that is another matter.
I have a friend with LG panels with micro inverters and 2 Powerwalls. His scale back production. One sunny day where he should have been producing over 10KW, he was only showing 1 or 2 KW. He was without power and his 2 PW were at 99%. So there are systems that scale back power. This is a brand new install (3 months old) from Sunrun. He has the Telsa TEG and 2 powerwalls. My Telsa install with a SE string inverter just shuts down completely.