If you want to have the rent from your tenant contribute towards paying off installation costs, then there are a few ways that it can be done. One way would involve charging them a monthly fee based on their electricity usage which would offset the cost of installing solar panels on your commercial property. Another option could include amortizing your total anticipated cost with taxes over 15-25 years while asking tenants for some extra cash up front before you decide to install solar panels—consider this when calculating a reasonable monthly bill for your tenants.