Where A1 Sun Ranks
Position among installers of home solar in each city, by installations in the most recent three years of records, and how A1 Sun compares with the local market there.
Its strongest market is Berkeley, where it accounts for 8% of the home systems with a known installer.
| City | Rank | Installations | Local share | Price vs. local median | Leased (city average) |
|---|---|---|---|---|---|
| Berkeley, California | #2 | 152 | 8% | about the same | 0% (5%) |
What A1 Sun Installs
- Typical system size
- 5.1 kW
- Leased or on a PPA
- 0%
- Installed with a battery
- 20%
Mostly sells systems the homeowner owns, paid in cash or with a loan.
Panel brands
- LG Electronics (36%)
- Enphase Energy (16%)
- Panasonic (11%)
Inverter brands
- Enphase Energy (99%)
- SunPower (1%)
- SMA America (<1%)
A1 Sun Prices Compared With the State
Median price per watt of systems the homeowner bought outright, before incentives.
| State | A1 Sun | State median | Difference |
|---|---|---|---|
| California (2021–2023) | $4.74/W | $4.16/W | 14% higher |
Home Installations per Year
Records for the most recent year can be incomplete while utilities finish reporting.
Where A1 Sun Installs Most
| City | Installations (2021–2023) |
|---|---|
| Berkeley, CA | 152 |
| Oakland, CA | 62 |
| Albany, CA | 21 |
| El Cerrito, CA | 21 |
| Piedmont, CA | 19 |
| Richmond, CA | 11 |
| Kensington, CA | 9 |
| Orinda, CA | 5 |
| Mill Valley, CA | 2 |
| San Leandro, CA | 2 |
| American Canyon, CA | 1 |
| Concord, CA | 1 |
| Corte Madera, CA | 1 |
| Crockett, CA | 1 |
| Danville, CA | 1 |
Before You Sign With A1 Sun
- California license: CSLB #891743 (B, C-46), issued 02/28/2007, registered to A1 SUN INC in Berkeley. It appears in the state's list of active licenses. Check its current status on the CSLB site.
- Reviews and contact details: call (510) 526-5715 (the number on its license) or see A1 Sun on Google Maps, where recent reviews tell you more than any ranking.
- Quotes: get at least three, and compare price per watt, equipment brands and the workmanship warranty — not just the monthly payment.
Compare A1 Sun with other installers
The Berkeley ranking puts A1 Sun next to the other companies that install the most there, with each one's price and leasing share.
Top solar installers in Berkeley →Where These Numbers Come From
Source: Tracking the Sun, Lawrence Berkeley National Laboratory (2024 edition), licensed CC BY 4.0. In New York and New Jersey, recent years come from the state programs' own records (NYSERDA and New Jersey's Clean Energy Program). Company names were standardized and closures checked against news reports by Solar Power Fix. More about our methodology.