@Stinson McElhinney
Property value increases will be marginal at best. The first thing we typically look at when buying / selling are the best comparables in the market.
Solar is often looked at as a "bonus"
The main thing homeowners baulk at when considering purchasing a home with solar is: Are the panels owned / leased? Is there an annual escalator in payment? Both of these "objections" can be explained via an agent who understands solar.
re: Solar will of course offset increases from SDGE as kwh rates have risen every substantially every year since the deregulation of electricity in 2001.
If it were me (and I used to be in the solar industry years ago) I'd either:
1) look at a $0 down option, preferably a purchase-to-own finance option. Most people prefer that over a PPA/Lease, or
2) Do nothing at all as your tenants will be paying electricity like you mentioned.
Regarding resale value, going solar won't have much of an effect.