If you regularly spend weeks away from your SDG&E-served home, include that schedule when comparing solar-plus-battery PPAs. Lower household use can change grid purchases and exports, but it does not automatically pause a PPA's electricity payments. A proposal based on your actual occupancy pattern can better show how generation and storage fit your year.
Ask for a lower-use month in the comparison
The CPUC solar guide explains that PPA providers own the solar system and typically charge for all electricity it generates at the contract's per-kilowatt-hour rate. Check your actual agreement's billing method rather than assuming it charges only for electricity consumed while someone is home.
For a controlled hypothetical example, assume the system produces 600 kWh in each of two comparison months and the PPA rate is $0.20 per generated kWh. The solar energy payment would be $120 in either month, even if the household uses less electricity during one of them. This excludes any separate battery fees and utility charges. It is arithmetic, not a current offer or a claim that real monthly production stays constant.
The useful comparison is therefore the combined PPA and utility budget for each scenario. Ask the provider to show which inputs change when travel reduces household demand.
Use SDG&E's actual solar billing arrangement
For customers on SDG&E's Solar Billing Plan, surplus electricity earns export credits based on the value of energy sent to the grid at each hour. Extra daytime exports should not simply be multiplied by the retail electricity price or the PPA rate.
The same SDG&E page explains that residential solar customers retain a Base Services Charge that export credits cannot offset. It also directs customers served by a community choice aggregator to that provider for generation import and export pricing. Identify the generation provider on your account before asking for the travel scenario. Households on an earlier NEM arrangement need that plan's rules instead.
Less household demand may leave more solar available for storage or export, but the result depends on the battery controls, remaining loads and available capacity. Do not assume a battery can retain several weeks of unused solar for your return.
Give the designer a realistic travel profile
Our suggested comparison checklist is:
- Mark the weeks you normally travel and the season in which they occur.
- List loads that remain, such as refrigeration, network equipment and necessary temperature control.
- Identify loads that stop, including an EV that leaves with you.
- Request separate projections for solar production, household use, battery operation, imports and hourly exports.
- Compare annual combined costs, including the months when you are home.
For example, a household that travels during sunny months may have a different self-consumption pattern from one away during winter. This is a reason to use a seasonal model, not a prediction that either household will necessarily save more.
Keep backup and service in the offer
A qualifying no-upfront PPA can help eligible homeowners access solar and storage while preserving cash. Confirm property eligibility, provider ownership, ongoing rate, escalator, term, battery fees, maintenance, replacement and transfer provisions. No upfront purchase does not mean free electricity or guaranteed savings.
General battery guidance explains that supported loads and stored energy limit backup duration. Ordinary grid-tied solar alone generally does not provide outage power; backup requires compatible equipment, and solar recharging depends on suitable sunlight. Being away does not remove these limits.
Sources checked November 13, 2026. Our billing-period guide helps keep the comparison dates consistent. Bring your bill history and typical travel calendar to a West Coast Alternatives consultation to discuss a proposal that reflects how you actually use the home.