We recently had two Tesla Powerwall2 batteries installed under a program with Green Mountain Power (GMP) in Vermont. GMP (heavily) subsidizes the batteries, but retains the right to discharge the batteries to generate power for the grid (e.g., at peak times).
Last Tuesday and Wednesday, our batteries were discharged by GMP for the first time. On Tuesday, our gas furnace went out – the flame sensor (wrongly) indicated there was a flame when there was no flame, which leads to the furnace to shut down (the furnace provides heat and hot water for us).
I think this sensor glitch in the furnace may have been caused by fluctuation in power in the home when the discharge started. I cannot be sure that this was the cause, because I don’t know exactly when the furnace went out. (The clocks and other appliances in the house were apparently unaffected.) We had a technician check the furnace and he found no problems that would explain the sensor glitch.
Are power fluctuations normal when discharging the battery like this? Or is this perhaps a symptom of a problem in the installation?
Is there anything we should do to monitor this issue? Or do I need to buy a power conditioner for the furnace?