Counts from public records, not a review or rating. I have no partnership with A1 Sun; the name is as the utility recorded it.
A1 Sun at a glance
| License lookup | California Contractors State License Board |
|---|---|
| Systems in records | 860 |
| Years in records | 2007–2023 |
| Latest record | 12/2023 |
| States | California |
| Top cities | Berkeley, Oakland, Albany, El Cerrito, Piedmont |
| Typical system | 4.4 kW |
| Main panel brand | LG Electronics Inc. |
| Main inverter brand | Enphase Energy Inc. |
| With a battery | 9% |
| Leased or PPA | 0% |
Records: LBNL Tracking the Sun.
A1 Sun systems by state
| State | Systems | Earliest record | Latest record |
|---|---|---|---|
| California | 860 | 2007 | 2023-12 |
Systems by year
Where A1 Sun installs
California
| City | Systems | Share of company's CA systems |
|---|---|---|
| Berkeley | 428 | 50% |
| Oakland | 151 | 18% |
| Albany | 53 | 6% |
| El Cerrito | 52 | 6% |
| Piedmont | 39 | 5% |
| Richmond | 28 | 3% |
| Kensington | 27 | 3% |
| Orinda | 13 | 2% |
| Lafayette | 11 | 1% |
| Martinez | 5 | 1% |
| Danville | 4 | 0% |
| San Rafael | 4 | 0% |
Source: LBNL Tracking the Sun, residential systems in utility interconnection records. City as the utility recorded it. How I count.
Equipment and ownership
- Panels: LG Electronics Inc. (42%), SunPower (9%), SolarWorld (8%), Enphase Energy Inc. (5%), SANYO ELECTRIC CO LTD OF PANASONIC GROUP (5%)
- Inverters: Enphase Energy Inc. (73%), SMA America (11%), SunPower (9%), KACO (1%), Fronius USA (0%)
- Leases and PPAs: 0% of its systems with known ownership were leased or under a power purchase agreement.
- Batteries: 9% of its systems had a battery on record.
Offered a lease or PPA? Read lease vs buy first.
Before you sign
- License. Look the company up with the California Contractors State License Board and check the name on the contract matches the license.
- Run the quote through the quote checker and the list in how to check a solar quote.
Companies of similar size in California records
Pacific Solar (868), Velocity Solar Power (866), Save A Lot Solar (863), Turn Key Construction (861), Occidental Power (857), Powerlight (856), Infinium Solar (852), Xero Solar (844).