Solar on a House Hack

[Charles E. Bruckman]

Hello,
I am currently house hacking a four-bedroom house and doing rent by the room for the other 3 bedrooms. The bills/utilities are in my name and I invoice the tenants monthly based on usage.

I am considering getting solar (through a loan) to help lower the electricity bill and cash flow a bit. Does anyone have any advice on how to effectively and fairly pass along the cost of the loan and the savings to the tenants? Are there any logistics regarding splitting costs that I need to be concerned about? The estimated ROI on this is 12%.

Any advice would be greatly appreciated. Thanks!