594 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Diamond Bar: Mr. Solar Clean, CR Score 80/100; 5.0★ from 369 Google reviews; open 24/7.
Best for emergencies (open 24/7): Solar Express Cleaning, posts 24/7 hours; ranked #2 of 594.
Most-reviewed: EnergyAid, 1,353 Google reviews at 4.7★, the most of 594 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
594 Diamond Bar solar installers are ranked here by CR Score, from ten published factors. 70 are open 24/7, 339 open Saturdays and 203 open Sundays, based on posted hours. The median Google rating is 5.0★ across 594 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Mr. Solar Clean | 80 | 5.0★ (369) | Carson, 28 mi away | 24/7 | Overall |
| 2 | Solar Express Cleaning | 63 | 5.0★ (308) | Chino Hills, 17 mi away | 24/7 | Emergencies |
| 3 | SoCal Solar Panel Cleaning Company | 63 | 5.0★ (246) | La Verne, 6 mi away | Sat · Sun · Evenings | — |
| 4 | Affordable Solar Cleaning Pros | 62 | 5.0★ (628) | Loma Linda, 33 mi away | 24/7 | — |
| 5 | EnergyAid | 62 | 4.7★ (1,353) | Santa Ana, 21 mi away | 24/7 | Most reviews |
| 6 | EnergyAid | 61 | 4.8★ (534) | San Bernardino, 30 mi away | 24/7 | — |
| 7 | Semper Solaris | 61 | 4.7★ (515) | Santa Fe Springs, 16 mi away | Sat · Sun · Evenings | — |
| 8 | Sunrun Solar | 60 | 4.8★ (262) | Santa Fe Springs, 15 mi away | Sat · Sun | — |
| 9 | BestSolarCleaning, LLC | 60 | 5.0★ (81) | Hacienda Heights, 8 mi away | Sat · Sun · Evenings | — |
| 10 | Pacific Solar Care & Window Cleaning | 59 | 5.0★ (310) | Eastvale, 19 mi away | Sat | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 369 Google reviews, listed on Google as “Solar energy company”.
Based in Chino Hills, 17 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 308 Google reviews, listed on Google as “Solar energy company”.
Based in La Verne, 6 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 246 Google reviews, listed on Google as “Solar energy company”.
Based in Loma Linda, 33 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 628 Google reviews, listed on Google as “Solar energy system service”.
Based in Santa Ana, 21 mi away
Ranked #5 because of its Google rating and trade focus: 4.7★ from 1,353 Google reviews, listed on Google as “Solar energy company”.
Based in San Bernardino, 30 mi away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 534 Google reviews, listed on Google as “Solar energy system service”.
Based in Santa Fe Springs, 16 mi away
Ranked #7 because of its Google rating and trade focus: 4.7★ from 515 Google reviews, listed on Google as “Solar energy company”.
Based in Santa Fe Springs, 15 mi away
Ranked #8 because of its Google rating and trade focus: 4.8★ from 262 Google reviews, listed on Google as “Solar energy company”.
Based in Hacienda Heights, 8 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 81 Google reviews, listed on Google as “Solar energy system service”.
Based in Eastvale, 19 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 310 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Walnut, 1 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 196 Google reviews, listed on Google as “Solar energy company”.
Based in Walnut, 5 mi away
Ranked #12 because of its Google rating and trade focus: 4.6★ from 161 Google reviews, listed on Google as “Solar energy company”.
Based in Anaheim, 19 mi away
Ranked #13 because of its Google rating and review volume: 4.9★ from 322 Google reviews.
Based in Altadena, 12 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Solar energy company”.
Based in Bellflower, 12 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 56 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Long Beach, 26 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 132 Google reviews, listed on Google as “Solar panel maintenance service”.
Based in Santa Ana, 21 mi away
Ranked #17 because of its Google rating and trade focus: 4.7★ from 156 Google reviews, listed on Google as “Solar energy company”.
Based in Redondo Beach, 34 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 90 Google reviews, listed on Google as “Solar energy company”.
Based in Anaheim, 26 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 110 Google reviews, listed on Google as “Solar energy company”.
Based in Glendora, 8 mi away
Ranked #20 because of its Google rating and trade focus: 4.8★ from 96 Google reviews, listed on Google as “Solar energy company”.
Based in Irvine, 24 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 43 Google reviews, listed on Google as “Solar energy company”.
Based in Whittier, 14 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 148 Google reviews, listed on Google as “Electrician”.
Based in Barstow, 40 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 292 Google reviews, listed on Google as “Solar energy company”.
Based in Los Angeles, 27 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 100 Google reviews, listed on Google as “Solar energy company”.
Based in Irvine, 24 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 99 Google reviews, listed on Google as “Solar energy company”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 594 ranked solar installers here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Sunlux | 58 | 4.7★ (559) | 15 mi |
| 27 | Solar with Roció | 57 | 5.0★ (45) | 19 mi |
| 28 | Sunrun Solar | 57 | 4.6★ (231) | 28 mi |
| 29 | Aikyum Solar | 57 | 4.9★ (59) | 21 mi |
| 30 | Clear Sky Solar Cleaning | 57 | 5.0★ (40) | 19 mi |
| 31 | SunSolar U.S. | 57 | 5.0★ (62) | 24 mi |
| 32 | Voltaic Construction, LLC | 57 | 4.9★ (132) | 9 mi |
| 33 | Sunrun Solar | 57 | 4.2★ (334) | 19 mi |
| 34 | NFG Solar Panel Cleaning Company LLC | 57 | 5.0★ (19) | 10 mi |
| 35 | NexGen Solar | 57 | 4.9★ (47) | 10 mi |
| 36 | Jake's Solar Cleaners | 56 | 5.0★ (5) | 6 mi |
| 37 | Solar Panel Cleaning near me Daylight Solar | 56 | 5.0★ (52) | 15 mi |
| 38 | SunGuide Solar Inc | 56 | 5.0★ (33) | 9 mi |
| 39 | HPM Solar | 56 | 5.0★ (54) | 2 mi |
| 40 | Donavas | 56 | 5.0★ (7) | 10 mi |
| 41 | FlowState Solar Cleaning | 56 | 5.0★ (91) | 33 mi |
| 42 | Solar Optimum Glendale | 56 | 4.7★ (348) | 30 mi |
| 43 | Solar G | 56 | 5.0★ (128) | 27 mi |
| 44 | Sun Studios | 56 | 5.0★ (77) | 32 mi |
| 45 | SunFire Construction Inc | 56 | 5.0★ (174) | 20 mi |
| 46 | Solar Panel Cleaning Windows | 56 | 5.0★ (41) | 34 mi |
| 47 | OC Solar | 56 | 4.8★ (326) | 24 mi |
| 48 | Solar Dust Busters | Solar Cleaning Company | Solar Cleaning Service in Los Angeles County | 56 | 5.0★ (12) | 19 mi |
| 49 | Powerfull Solar, Inc | 56 | 5.0★ (66) | 31 mi |
| 50 | Energy Time Solar | 56 | 4.9★ (45) | 25 mi |
20 more solar installers within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| ACOSolar Inc | 5.0★ (2) | 1 mi |
| America-Asia Solar Corporation | In Diamond Bar | |
| Best Solar Company Rowland Heights | 5.0★ (2) | 6 mi |
| Better Power Project | 5.0★ (2) | In Diamond Bar |
| Bright Spot Solar | 5.0★ (2) | 7 mi |
| Burning Daylight Solar | 5.0★ (2) | 5 mi |
| Cooper Roofing | 4.7★ (12) | In Diamond Bar |
| Empire Energy Solutions | 5.0★ (1) | In Diamond Bar |
| Eversun Solar Engineering LLC | 5.0★ (2) | 7 mi |
| HPM Solar | 5.0★ (2) | 7 mi |
| Kingtec’s Solar | In Diamond Bar | |
| Lux Smart Energy | 5.0★ (2) | 4 mi |
| Mzeda Inc | In Diamond Bar | |
| PowerECO Inc. | In Diamond Bar | |
| Solar Appointments | In Diamond Bar | |
| Solar My Home Chino | 5.0★ (2) | 7 mi |
| SolarGreen DirectPanel Chino Co | 5.0★ (2) | 8 mi |
| The Solar Heroes | In Diamond Bar | |
| Trusted Energy Consulting | In Diamond Bar | |
| Watson Solar Panel Cleaning | In Diamond Bar |
Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Solar panel installation | $29,770 | $33,680 | $36,640 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.08 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
We scored 594 Diamond Bar solar installers on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 23, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Diamond Bar data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |