So i was finally able to get a refund of the $1125 that Tesla charged me as sales tax on the 3 powerwalls. the State DOR confirmed that there should be no tax on powerwalls installed as a part of a solar system, but can do nothing to refund the tax as Tesla is the taxpayer in this case. I contacted Tesla explaining the problem. First I got crickets, then I got a “we are looking into it” email. The next email said sorry, we can’t refund that. After I sent another “powerwalls are not taxable according to the state DOR” email, they escalated it and came back with, sign these forms and we will refund you in the manner you paid. One form was a copy of the original purchase agreement with the tax removed. The other form was a MA state tax exemption form with the “solar system” box checked. I got my credit card refund a couple of days later (today).
Bottom line: if you’ve paid sales tax in MA to Tesla, ask for a refund and don’t take no for an answer. If you haven’t paid yet, get it adjusted before you do.
Thanks
@TORQU3 for pointing this out.