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    KOTA Energy Group

    3.5 (107 reviews)
    Closed • 8:00 am - 8:00 pm

    Services - KOTA Energy Group

    Solar system maintenance

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    Chloe A.

    This was the worst solar experience imaginable. These people destroyed a wall and halted our renovation, we told them so many times, they didn't care, I had to hire someone after waiting 2 weeks for them just so we could continue. They damaged the electrical to the house, they tracked dog poop all over my house, they damaged exterior walls and never fixed them, they left us without power for a full day and no heat int he dead of winter, they left a generator in our yard for a month despite pleas to come get it, they installed 4 months late, They lied repeatedly about nearly every aspect of the install, they left giant holes in my walls for 6 months now. They are unethical. They do terrible work. The customer service is catastrophic. They left our house damaged, we have paid over $10,000 in repairs. We demanded they pay for this and only covered $5,000 which took them 6 months to pay. We confronted our manager Nate and his boss John Hard. They lied to our faces about nearly everything. I can get into detail if you want to know. They are also silenced anyone below them who tried to help us. I regret choosing Kota more than I can articulate. I have heard other tales of horror. Roofs being destroyed, rain damage from incompetent installs, damage inside the home. They do not care once they have our money. Some of the worst people to work with, pls avoid at all costs. I only wish we could cancel our contract.

    My house with 8 panels installed by KOTA.
    Paul W.

    My experience with KOTA was easy. Matan Bostick was engaging and informative from the very first minute. He took the time to understand what my needs were and what I was hoping for with the program. I wasn't sure about the number of panels because I was looking to lease an EV. Matan was patience as I went back and forth, and helped me come to a conclusion without trying to upsell with the higher panel count. Matan's focus was solely on me. His only goal was to make sure I had all the answers I needed without any pressure. I knew this would follow suite with KOTA, and it has. I have a handful of neighbors who already used KOTA for their solar needs, and I'm glad I did, too. I felt very comfortable, supported, and confident that my experience with Matan would lead to an equally satisfy experience with pre-inspections, permits and the actual installation this past week. I'd recommend KOTA for your solar needs, and Matan as your sales rep. He is what made KOTA jump to the top over other solar providers that I talked with recently.

    Bad panel. Can you tell?
    Russell M.

    KOTA still will not replace defective panels. Now there are two panels going bad and this company is the worst as they do not stand by there products. Shame on them.

    James M.

    I am actively trying to recoup losses from KOTA. The crew that put in my solar panels, caused 17,000+ dollars in damage to my property and counting. They broke many roof tiles, and there are large gaps in most all of the stanchions for the panels frame. One was literally 45 degrees in the air. This means that every rain since the install, damaged my underlayment, plywood, insulation, living room ceiling and walls drywall, and paint (yes I had to put out buckets). I have had two solar certified roofing companies inspect their work, and both have given bids that 15,000 dollars of work needs to be performed to completely reinstall the panels, and replace the underlayment because they were not installed correctly / professionally. This cost is likely to rise once the tiles come off and the plywood and insulation are inspected. I have estimates that the interior damage is 2,000 dollars currently. I have contacted the company for 2 months well over a dozen times, spending countless time on hold, and nothing. I was told by their project managers they fired every install crew they had except one for incompetence, and then the entire Bay Area office was fired. I reached out directly to their CEO and Director who promised to fix my roof "with all urgency" but nothing happened except more damage every time it rains for weeks. Moreover, these are just the current issues. My system failed inspection multiple times. The crew failed to show up multiple times during the install. I called them and told them the were planning to install incompatible microinvertors in the plans, and they completely ignored me, delaying the installation for months when they showed up with the ones (I told them) wouldn't work. The company failed to install the panels where we agreed. Their crew installed the cut-off switch in the middle of my wood storage and lied they could not move it. My entire system stopped working last year, and after four months, I had 3,000+ in charges to pay for before they replaced every microinvertor (after trying to claim it was an "act of god" not their absolutely amateur installation). The only good thing about this company is the salesman. KOTA is a dumpster fire, point blank, full stop. If you had an installation done by them in the Bay Area, PLEASE have it inspected (a roofer / solar company will likely do this for free). Your roof is likely being damaged every time it rains. The longer you wait, the more damage there will be. There is no question this is KOTAs fault. I had zero leaks, and my entire roof inspected, and all aging materials replaced a year prior to KOTAs installation. Please see the pictures attached, it is simple to see their shoddy / poor workmanship, and the issues it caused.

    Seth C.

    We had a great experience with Rae from Kota. He was recommended by a friend and did what we wanted: gave us clear information, answered our questions clearly, honestly, and without pressure, and let us move the project forward at our own pace. In the end we wound up financing the entire thing including a new roof (through the company the Rae recommended). The entire process took a bit of time given that we first had to get the roofing done and then schedule the installation, but Kota was pretty quick to do their part of things. The slowest part was waiting for the city inspections and for PG&E. Kota wasn't the cheapest quote we got, but it seemed like they had a good process and I felt best about moving forward with Rae compared to the several other salespeople with whom I spoke. I will admit that people from Kota still knock on my door now and ask me why I don't have solar, but I imagine that they'll update that system and stop fairly soon? 5 stars for Rae in particular; Kota in general was fine but I can't really compare the install or other parts of the process with other companies. In the end our system is cranking out the predicted amount of electrical and we have negative usage so feeling pretty good about that, and will feel even better when the tax credit kicks in!

    The installation of the battery for the solar panels.

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    9 months ago

    They closed and bankrupted and didn't let their customers know . Leaving solar customers out and dry

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    Page 1 of 3

    Ask the Community - KOTA Energy Group

    Review Highlights - KOTA Energy Group

    “I worked with Pablo Avila on a solar panel installation, and he was extremely, courteous, responsive, and helpful.”

    Mentioned in 19 reviews

    Read more highlights

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    Got Watts Electric Solar & HVAC

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    Got Watts installed two phases of solar panels on my roof, 67 panels in total. The job was massive,…read morethe price was fair, and the follow up service was excellent. There were hardware glitches after installation, but the Got Watts team reliably spotted them - without me realizing there was even an issue - and sent teams out to ensure my equipment worked as promised. Years later I noticed some leaks through my roof where some phase 2 panels were installed. I notified Got Watts and they sent large crews to my home to rectify the issue over several days. This was no small fix. They probably spent vastly more to rectify the leaks than they did to install the panels to begin with. No one likes to have problems with an install. But, it means a lot for a contractor to honor their commitment and spend vast sums to honor their warranty, and their word, to their customer. I've had "good companies" make promises they wouldn't honor once the initial check cleared. Got Watts was true to their word and treated me in a dignified manner that is rare these days. I would unreservedly recommend the good people at their firm. Special thanks to Sam Moore and Daniel Harrold for their excellent service.

    It was a pleasure working with Adrian and Bill to go through the process of getting solar installed…read moreon our home with Got Watts. They were genuinely interested in helping us understand the process and addressed all our questions and concerns up front with honesty and integrity. Kudos to the entire Got Watts team, from Joe for the site survey to Tim and his install teams and Marc for the final inspection/walkthrough and Mallory, Jenn, and Lindsay in the office. The team kept in constant communications throughout the entire process. The install team did excellent work to make sure everything looked good and functioned correctly. They were exceptional in their craftsmanship to install the system and went the extra mile to minimize any changes to the outside appearance of our home (almost an invisible installation!) We are 100% happy we chose Got Watts for our Solar and Battery solution!

    Diablo Solar & Electrical Services - Even our youngest solar installation technicians love their job at Diablo Solar!

    Diablo Solar & Electrical Services

    (294 reviews)

    Diablo Solar & Electrical Services put in our pool solar panels in 1999 and they have serviced them…read moresince then. Theses panels have done an incredible job of heating our pool throughout the years, thanks to Diablo Solar maintaining them. Recently we had to replace our roof. Diablo Solar worked closely with us to take the panels off and put them back on right before and right after our roof was replaced. The crew did an amazing job! They were super polite, friendly, knowledgeable, professional and considerate. Zach, Gary and Joe took the panels off. They carefully placed them in our yard and did not damage a single piece. Zach and Julian put the panels back on our roof perfectly. They look beautiful and are again heating our pool flawlessly. They helped to make our roof replacement so much easier and I truly appreciated their hard work. I would highly recommend Diablo Solar Services!

    Update: The services…read moresenior leader called to discuss the issues. He was very polite and professional. He also shared the depth of the challenges with the company that manufactured our panels. We agreed to fix the system by excluding the impacted panels. I offered to pay the one hour of labor that would he have been expected (as I simply wanted to system to work and felt this was fair). They arrived promptly and made the fix. Since then the system has been working fine. I suggested some changes to their customer service model as all of these issues could have been easily avoided. I appreciated his call and rapid response.

    Green Air Heating and Air Conditioning - Solar Panel Install in San Ramon, CA.

    Green Air Heating and Air Conditioning

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    Green Air has been fantastic from start to finish. We had a pretty complicated set-up and Nick was…read moreable to figure out the best possible Solar and Powerwall solution. The team are true experts and so enthusiastic about what they do. The installers were quick, clean and just really great people (sorry I can't remember all the names but thank you all). Maria expertly keep on top of all the paperwork, navigating PGE to get our NEM 2 application moved over from a different provider (who was not able to come up with a workable solution for us). To cap it off, we had an unrelated issue with our main panel and GA came out immediately, diagnosed the issue and got everything working again. I can't recommend them highly enough. Thanks you!

    This is the worst company I have encountered when hiring contractors and paying for membership…read moreplans through the years. Green Air actually took over Certified Heating's clientele (I was with Certified for 2 years) and they were wonderful. After they took over, they already cut down our maintenance visits from 2x a year to 1x a year. I wasn't too happy about it but the techs that came were nice and cordial. However, I'm not really sure what's going on. Maybe new management. I had my last maintenance service done in 6/2025. I moved in Dec 2025 and transferred my service to the new address. I scheduled a maintenance service for end of this month and just last Thursday, I got an update email that they were downgrading and removing all HVAC tune ups, air filter changes and solar cleaning. Basically all the benefits that I chose to pay the membership. What really angers and frustrates me is how no one is picking up their phones and it goes straight to vmail. When I did finally get an email reply, they stated that they would only apply my 5 month payments to the maintenance fees, so they basically didn't count the previous months I paid at my old home. I feel like that is pretty unfair, that I paid a full year to have no maintenance included and I would have to pay more money on top to match whatever fee they say maintenance services are currently. They didn't offer a refund or that my service I already scheduled back in May would be taken care of. Now I just want to cancel and take it as a loss since I can't get a clear answer. I will have to find a new company that hopefully cares about their customers.

    Sunlight Electri-Cal Solutions - Franklin certified

    Sunlight Electri-Cal Solutions

    (83 reviews)

    I'm a bit late in writing this as our system was installed last Oct 2025 but wanted to give a big…read moreshout out to Sunlight Electrical. My mom and I couldn't be happier with the service we were provided from start to finish. We contacted the business in late July of last year to see about installing a solar system on our home before the end of the year. Within in days, Alessandro was here to meet us in person and provided us with a comprehensive breakdown for solar options and pricing. We loved that we were treated like actual people instead of a number in a queue. Given that there was a slight backlog of jobs they had to work through we were assured that we would have our system fully installed and activated before the end of the year, which we did! It was great working with Nick who was our onsite rep and Juan was always available to answer any questions we had by phone (of which I had many). Despite the number of times I called, he was always patient with me and provided detailed answers that gave me a better picture of our installation and how our system would operate moving forward. I can't say enough about how amazing the whole process was. Looking at our electrical bills right now and we're in awe of all of the savings we're getting, which validates our decision to purposefully oversize our system. If and when we decide to install a car charging station in our home we're definitely going back to Sunlight!

    I can't say enough good things about Carlos Gomez from Sunlight Electri-Cal Solutions…read more I've been working on a non-standard solar setup using an EcoFlow Delta Pro Ultra X and EcoFlow Smart Home Panel 3, and finding a contractor who truly understood this type of system was incredibly difficult. I spoke with many contractors, and almost all of them sent salespeople who gave generic answers or tried to push cookie-cutter solutions that clearly didn't fit my setup. Carlos was completely different. From the moment he arrived, it was clear he wasn't a salesperson -- he's an engineer, and it shows. He took the time to deeply understand my system, reviewed actual spec sheets on the spot, and immediately identified issues that other contractors completely missed. Multiple companies told me Hyundai panels would work fine. Carlos checked the amperage limits, applied proper safety margin calculations, and clearly explained why those panels would not work with my EcoFlow system -- saving me from a costly mistake. He also walked me through: Proper panel selection within voltage and amperage limits Safe string configurations and series wiring How to maximize roof space while staying within code Permitting requirements I hadn't been told about before On top of that, Carlos identified critical code and safety requirements that no one else mentioned: Bollards required in the garage to protect battery units Correct battery placement to maintain required clearance from doors and entrances Heat detector requirements for battery installations in a garage These are all things that would have caused inspection failures later -- and Carlos caught them immediately. He spent well over an hour with me, climbed onto my roof to check for obstructions, inspected battery placement, reviewed wiring paths, and answered every question in detail without ever rushing me. What truly sealed the deal was how efficient and transparent the pricing process was. Carlos was able to turn around a detailed quote very quickly, and when I received it, I was honestly surprised -- it was a significant amount lower than every other quote I received, even though his evaluation was by far the most thorough. Given everything: His technical expertise The level of detail and care The ability to integrate with my existing system The fast turnaround And the much better pricing Choosing Sunlight Electri-Cal Solutions was a complete no-brainer. Carlos is knowledgeable, meticulous, honest, and genuinely passionate about doing things the right way. After meeting him, I completely understand why this company has such strong Yelp reviews. If you're in the Bay Area and need electrical or solar work done the right way, especially for a non-standard or custom system, I highly recommend Carlos and the team at Sunlight Electri-Cal Solutions.

    Alcor Solar Pool Heating - Alcor Solar is a stocking distributor/dealer and have full stock available at all times.

    Alcor Solar Pool Heating

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    We hired Alcor Solar to install new thermal solar panels for our pool, and the entire experience…read morewas very positive. Sue, the office manager, was great to work with--she was responsive, helpful, and kept us informed throughout the process. Joe came out to provide the estimate, and he and another installer completed the installation in just one day. They recommended using a pool cover to help retain heat overnight when temperatures drop, and that advice has worked well for us. Since installing the system and using the pool cover, our pool temperature has been averaging around 82°F in the morning and warming up to approximately 85-87°F during the day. We haven't experienced many really hot days yet, but so far the system is performing exactly as we had hoped. We're very happy with our decision and are glad we finally made the switch to solar.

    I had a real "good news / bad news" experience with Alcor Solar. The good news is their technician…read moreJoe. When he arrived, he diagnosed and fixed my solar-pool plumbing issue in minutes--professional, efficient, and friendly. If my review was based solely on his work, it would be five stars. The bad news is everything leading up to that visit. I first contacted the front office on April 16 via email and received a response from Sue. Responses were slow and vague; I could not even get a ballpark estimate without repeated follow-ups. My last email requesting scheduling went unanswered, and then--three weeks later--Joe called on May 6 saying he was eight minutes away. I had no idea I'd been scheduled, and I was just lucky to be home. Bottom line: if you can get on Joe's calendar, you'll likely be happy with the repair. Just be prepared for shaky communication and scheduling from the office staff.

    Solar Optimum Benicia

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    I thought I would leave feedback after having solar installed in 2022 by Solar Optimum here in the…read moreeast bay. Solar optimum offered me Panasonic solar panels with a warranty guarantee from Panasonic which essentially guaranteed that as long as Solar optimum or any other certified installer installed our system that even if Solar Optimum were to go out of business, Panasonic would pick up the workmanship and product warranty for 25 years - this was something that no other company I reached out too could offer and to me made it clear that I wanted to go with Solar Optimum. After install Panasonic did send me a warranty certificate warranting the panels should Solar Optimum go out of business. The system works well. In its first year it significantly outperformed the estimated production by about 3MWH and YTD it will soon pass the production estimate for the entire 2024 year. There were two big issues when working with Solar Optimum - communication was brutal and would constantly be a back and forth of unanswered emails, non returned phone calls, and overall poor communication. The second issue was after install the installers drilled holes too deep and through my ceiling drywall and coordinating the install team to come out and fix it wasn't easy and took longer than it should have - when they finally came out to patch my drywall they smeared over some putty in the 8-10 holes, didn't paint it and didn't try and match the patches with my roofs texture leaving that responsibility with me. However because they're a smaller company there are far less mark ups compared to other solar companies and the price was far more competitive than any other company I cross shopped with an outstanding Panasonic backed warranty.

    Prepare to overpay and feel overvalued if you make the mistake of becoming one of their customers…read more Read BBB complaints about bait and switch tactics that are common practice here before you do business with these incompetent people. Not one of my complaints were responded to. Extremely poor communication over the full year it took them to complete my project. I wish someone had warned me. Find a local contractor and skip these middle men!

    NorthStar Solar - New Enphase 10C Battery was just released and this is the first one we installed. Very powerful, cutting edge, and compact.

    NorthStar Solar

    (126 reviews)

    Northstar Solar just completed a solar panel installation on my home. The crew was professional and…read morepersonable. The cost was most reasonable compared to the other estimates I received and the end product was perfect in design and installation. This is a very good company. It gets my highest recommendation. Martin E Northstar Solar just completed a solar panel installation on my home. The crew was professional and personable. The cost was most reasonable compared to the other estimates I received and the end product was perfect in design and installation. This is a very good company. It gets my highest recommendation. Martin E

    Wow, I cannot say enough good things about Ryan and his team! I hired them to remove our 69 solar…read morepanels and reinstall them after a re-roofing of our home. It's a nerve wracking process but Ryan gave me reassurance things would go well. Upon Ryan's recommendation, we also decided to replace the solar panel racking system installed by Sunrun because we were plagued with roof leaks due to improper sealing of their footings. Ryan and the Northstar team were absolute champs at removing and reinstalling the new system for us. Everyone we dealt with was so professional, kind and easy going. The work was beautifully done and based on all the photos and detail provided by Ryan I am confident we will be safe from leaks going forward. He also had to coordinate the reinstall with our roofer and everyone handled it so well. I 100% recommend Northstar and the team for this task, and also wouldn't hesitate to hire them for roofing based on their strong work ethic and product with our solar project. The price was fair and in line with other quotes I'd received. A couple of questions unrelated to this particular job have come up and Ryan has gone above and beyond to help me out by providing his professional input. So happy with these guys. Thank you!

    KOTA Energy Group - solarinstallation - Updated October 2026

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