Solar savings aren't a single number — they depend on your utility rate, how much power you use, your roof, and how you pay for the system. Here's how to estimate yours without the sales spin.
Start with what you actually pay
Pull up twelve months of electric bills and find your average monthly cost. Southern California Edison (SCE), LADWP, and PG&E (in parts of Kern County) have all raised residential rates repeatedly in recent years, and on a time-of-use plan the 4–9 p.m. peak can cost noticeably more than off-peak power. Rates depend on your utility and rate plan, but the pattern is consistent: bills tend to climb year after year. That escalation is the quiet reason solar pays off — you're not just saving today's bill, you're avoiding decades of increases. Homes in the high desert, like Lancaster and Palmdale, often see the biggest bills thanks to long, hot summers and heavy AC use, so the savings opportunity there can be larger.
Size the system to your usage
A well-designed system offsets the large majority of your annual electricity use. The sunnier and less shaded your roof, the fewer panels you need to hit that target. Our savings estimator does this math instantly — slide your bill and it returns an approximate system size, your new monthly bill, and a 25-year savings figure.
Understand payback vs. lifetime savings
Two numbers matter. Payback is how long until your savings cover the system cost — often in the single-digit years for cash or low-rate financing. Lifetime savings is the total you keep over the system's 25-plus year life, which is typically many times the upfront cost once rate increases are included.
How you pay changes the picture
Paying cash gives the lowest lifetime cost. A $0-down loan spreads it out, often at a monthly payment below your old bill. A prepaid PPA or lease trades some ownership upside for simplicity and predictable pricing. None is "best" universally — it depends on your goals. We walk through all of them in our financing guide.
The honest caveat
Any online estimate is a starting point. Your real numbers depend on a site-specific design — roof angle, shading, your exact SCE, LADWP, or PG&E rate plan, NEM 3.0 export credits, and current incentives. That's the part an ACS specialist confirms for free, with no obligation. ACS has designed solar and battery systems across Southern California — the Antelope Valley, Los Angeles, and Ventura counties — since 1983, so request a free estimate to see what makes sense for your home and rate plan.