Solar: Need help with the offer price

[Yulya Marucya]

Hello, I found an off-market deal and looking for an advice from fellow investors.

It's a 3BR/2BA in Largo, FL, 33774. The seller wants a market price of 320K (however in a hot market like this properties are going for way over the market price), BUT he wants me to also take over the loan for solar with monthly payment of $250, or add that 10K + 10K incentive that he needs to "pay back" to the purchase price. I'm new at investing and solar panels and not sure if I should try to negotiate.

What would you do in my situation?