Battery Backup & Solar in San Marcos, CA
The federal tax credit expired at the end of 2025. SDG&E's rates did not. Here is what battery backup and solar actually cost in San Marcos in 2026, backed by 10 completed local jobs.
10 completed jobs in San Marcos and counting
San Marcos is inland North County: hotter summers than the coast, heavier air conditioning loads, and the same SDG&E rates as everyone else in the county. When the AC is running hardest, 4pm to 9pm, is exactly when SDG&E charges the most. That mismatch is why battery backup keeps coming up in our San Marcos quotes.
RCH Renewables has completed 10 jobs in San Marcos covering solar, battery backup, and EV charger installation, from San Elijo Hills to Lake San Marcos to Twin Oaks Valley. We prepare the plans, submit the permit to the City of San Marcos, handle SDG&E interconnection, and schedule the inspection.
The work is not all residential. In 2025, the facilities team of a national grocery chain dispatched RCH to one of its San Marcos locations for an AC-disconnect relocation. Commercial dispatch work runs on tight scheduling and documentation, and it is part of how we keep our electrical work sharp.
Notable San Marcos install: 9.24 kW solar paired with a 13.5 kWh Powerwall, completed October 2025.
10
Completed San Marcos jobs
20-25 min
Drive from Fallbrook HQ
5.0
Google rating
C-10
Licensed, #1108682
What we do for San Marcos homeowners
Battery backup
Tesla Powerwall 3 for San Marcos homeowners who want outage power and NEM 3.0 bill relief. Inland summer afternoons push air conditioning hard through the exact 4-9pm window when SDG&E rates peak, which is where a battery earns its keep. Standalone from approximately $13,729 installed. Bundle with solar from approximately $23,724. Financing from approximately $123/mo via GoGreen. Payment options depend on FICO, term, and lender.
Notable San Marcos install: 9.24 kW solar paired with a 13.5 kWh Powerwall, completed October 2025.
Battery backup detailsSolar installation
San Marcos sits in the inland valley: less marine layer than the coast, more direct summer sun, hotter afternoons. Panels give up a little efficiency in the heat, but the clearer mornings keep production strong. We size every system to 12 months of your actual SDG&E bills, not a generic calculator.
Solar installation detailsEV charger installation
Tesla Certified EV installer with multiple completed charger installs in San Marcos across 2025 and 2026. We check your panel capacity first, pull the permit with the City of San Marcos, and route the conduit clean: no exposed wiring, no shortcuts.
EV charger installation detailsElectrical panel upgrades
Homes built before the 2000s often still run 100-amp panels that were never sized for an EV charger plus a battery plus air conditioning. We upgrade to 200-amp service, replace aging panels, and install SPAN smart panels when circuit-level control makes more sense than a bigger service.
Electrical panel detailsIn an inland valley, the battery does the heavy lifting under NEM 3.0
Under NEM 3.0, solar without storage exports your daytime production to SDG&E for roughly $0.05–0.08 per kWh, then sells it back to you during the 4–9pm peak at $0.66/kWh. In San Marcos that peak window lands on top of the hottest part of the day, when the air conditioner is working hardest. A battery closes the gap: bank the cheap daytime solar, run the house on it through the expensive evening hours.
Inland heat also changes how we install. Powerwall 3 is rated for outdoor installation, but batteries run best at moderate temperatures, and a west-facing stucco wall in August is not moderate. In San Marcos we favor garage interiors, north-facing walls, and shaded locations, and we confirm placement on a site walk instead of guessing from a satellite photo.
Already on NEM 2.0? Adding a battery does not disturb your grandfathered tariff. The solar system stays on NEM 2.0 and the battery goes in as a standalone upgrade under a separate interconnection process. We handle that paperwork.
GoGreen financing available. See /financing for payment options. Rates depend on FICO, term, and lender. RCH is not the lender.
Standalone battery
~$13,729
Powerwall 3, installed. Adds backup power and NEM 3.0 bill optimization. Does not affect existing NEM 2.0 tariff.
Solar + battery bundle
~$23,724
4kW solar + Powerwall 3, installed. Financing from approximately $123/mo via GoGreen. Payment depends on FICO, term, and lender.
Add EV charging
Pair with Tesla Wall Connector
Charge overnight at low off-peak rates instead of the evening peak. Tesla Certified installation, San Marcos permit included.
EV charger detailsDo solar and battery make sense in San Marcos right now?
Yes, and here is the honest version. The federal residential solar tax credit expired December 31, 2025, so payback runs longer than it did a year ago.
What has not slowed down is SDG&E. Rates went up 11.6% in January 2026 alone, with another increase in regulatory review. Every month of waiting is a month of buying peak power at $0.66/kWh to run the AC.
San Marcos Battery + Solar Economics, 2026
SDG&E rates as of early 2026. Installed pricing is approximate; final quote depends on your site. Financing rates depend on FICO, term, and lender. RCH is not the lender.
What makes RCH different in San Marcos
Plenty of solar companies will quote a San Marcos address from an office an hour away. Here is what working with a local contractor looks like instead:
Named founders
Ian Crilly and Landon Raster. One of us is on every job.
C-10 license #1108682
Look it up on the CSLB website. Not a C-46 solar-only license.
No subcontractors
The crew doing your work is licensed under our C-10.
20-25 minutes away
We are based in Fallbrook, straight down the 15 corridor.
10 completed San Marcos jobs
Solar, battery backup, EV chargers, and commercial dispatch work.
5.0 Google rating
"5 stars from customer service to quality of work." - Paul N
Large operations bake their overhead into the quote and hand you a call center number after the install. We give you a direct line to the people who did the work.
San Marcos homeowner questions
Does San Marcos heat hurt solar panel output?
Some, at the margins. Panel efficiency drops about 0.3-0.4% per degree Celsius above 25°C, so an inland panel on a hot August afternoon produces a few percent less than its spec sheet. The other side of the ledger: San Marcos gets less marine layer than coastal cities, so mornings start producing sooner. We size from your actual bills, so the heat is already priced into the estimate.
Where should a battery go in a hot inland garage?
Placement matters more in San Marcos than on the coast. Powerwall 3 is rated for outdoor installation, but batteries prefer moderate temperatures, and sustained heat works the thermal management harder. We favor garage interiors, north-facing walls, and shaded exterior locations, and we walk the site before picking the spot rather than defaulting to whatever wall is closest to the panel.
Who handles the San Marcos permit and inspection?
We do. RCH prepares the plan set, submits the permit application to the City of San Marcos, handles plan check corrections if any come back, coordinates SDG&E interconnection paperwork, and schedules the inspection. Timelines vary by project scope, so we give you a schedule estimate with your quote instead of a generic promise.
Do you serve San Elijo Hills, Lake San Marcos, and Twin Oaks Valley?
Yes, all of San Marcos, from San Elijo Hills to Lake San Marcos to Twin Oaks Valley. For HOA communities, California Civil Code 714 limits what an HOA can restrict on solar: reasonable placement guidelines are allowed, outright prohibition is not. We handle the HOA submission paperwork where it applies.
What North County customers say
“My wife and I have been trying to get our City permit for over a year and a half through other companies with no luck. RCH stepped in and got it done just like that!”
- Glen Miki, 5 stars
“Committed to get the job done right and make everything look great.”
- James Herman, 5 stars
“Landon and his team did an incredible job. The work was done efficiently, professionally, and effectively.”
- Michael Reeves, 5 stars
10 jobs in San Marcos. We know the heat, the permits, and the neighborhoods.
Battery backup, solar, EV chargers, and electrical panel upgrades from local contractors 20-25 minutes away in Fallbrook.
Ready to find out what battery backup and solar cost at your San Marcos address?
Fill out the form and we will follow up within one business day. No sales pressure, just a straight answer on whether it makes sense for your home and what the numbers look like.
Ian Crilly
Residential Manager, RCH Renewables, C-10 Licensed (#1108682)
Last updated: July 2026