Client Testimonials
Real feedback from homeowners, contractors, engineers, and project partners.
Professional & Complex Projects
Feedback from contractors, engineers, and project partners on complex commercial and large-scale solar projects.
Solterra Global
Tim Fekete · Electrical Administrator · Seattle, Washington
Sanjay has consistently impressed us at Solterra over many years with his extensive industry knowledge, commitment to accuracy/detail, and willingness to do what needs to be done to meet tough deadlines. He is a pleasure to work with, and his easy, genuine natural ability to connect with people always shines through. What I especially appreciate is his availability and willingness to “talk shop,” helping us all grow and better understand issues of the day.
Sanjay has easily handled many off-grid, large/small commercial, residential, solar/battery projects for us, often implementing progressive techniques, design, and components. He has also consulted with/brought in the proper engineers, AHJs, industry professionals, etc., as necessary without fail. His plan sets are intuitively designed, accurate, and thorough. I really can’t say enough regarding the excellent quality of product.
He also consistently displays a high moral compass and standard, intuitively sensing the right path and acting accordingly. Solterra highly endorses and recommends Gemini for all types of solar/battery related projects, and we look forward to continuing our partnership as our industry grows.
Stone Building Corporation
Gregg Stone · Builder · Orange County, California · LinkedIn
Sanjay with Gemini Solar Design did a fantastic job with the solar and ESS design for our new home and ADU project in Orange County, California. As a builder, I especially appreciated his knowledge of the evolving solar PV codes and requirements, particularly the newer ESS requirements. He was responsive throughout the process, always answered my calls, and was a helpful team player in coordinating the overall design and approval of the rooftop PV system.
It was a pleasure working with Sanjay, and we will definitely be using Gemini Solar Design for the solar and ESS design on our future projects.
Ken Yu Construction
La Quinta, California · Commercial Contractor · Five-Building Apartment Development
We hired Gemini Solar Design to complete the photovoltaic designs for five new apartment buildings in La Quinta, California. This was a large project with different roof layouts and electrical requirements for each building.
The electrical design was more complicated than a normal residential solar project. The buildings used 120/208Y, three-phase, four-wire electrical service with Enphase three-phase microinverters. The solar systems also required coordination with the new group-metering switchgear, main termination boxes, utility disconnects, and load-side interconnections.
Sanjay completed detailed and organized plan sets for all five buildings. The drawings clearly showed the module layouts, microinverter branch circuits, three-phase connections, conductor sizes, breakers, disconnects, grounding, equipment locations, and interconnection details. He kept the designs consistent across the entire development while also handling the different conditions at each building.
Sanjay was responsive and patient when we had questions or needed revisions. Changes were handled smoothly, and he communicated the technical requirements clearly. This helped us coordinate the solar work with the other electrical and construction work taking place on the project.
Gemini Solar Design did a very good job managing a challenging, multi-building commercial project. We were pleased with the quality of the plans and would work with Sanjay again on future solar projects.
Redvale Solar & Electric
Georgetown, Texas · Commercial Solar Contractor · SMA High-Leg Delta Project
We worked with Gemini Solar Design on a commercial rooftop solar project that had several design challenges beyond a typical installation, including a ballast-mounted array, SMA string inverters, a high-leg delta electrical service, and a line-side utility interconnection.
Sanjay did a great job working through the electrical details and putting together a complete, contractor-friendly plan set. The drawings clearly laid out the stringing, inverter connections, conductor and conduit sizing, overcurrent protection, disconnects, interconnection, equipment locations, and ballast requirements. Having that level of detail made it much easier for our team to understand exactly how the system was intended to be installed.
What we appreciated most was that the plans accounted for the actual conditions of the project rather than treating it like a standard commercial solar system. The existing high-leg delta service required some careful design work, and Gemini provided a clear solution that our installation team could follow.
As a solar contractor, good engineering makes a significant difference in keeping a project moving and avoiding unnecessary questions or changes in the field. Gemini Solar Design provided the level of detail and technical understanding we look for in a design partner, and we would be happy to work with them again.
Copperlight Solar & Electric
Arizona · Residential Solar Contractor · High-Volume Enphase Projects
We worked with Gemini Solar Design on hundreds of residential solar projects, primarily Enphase microinverter systems, and Sanjay consistently proved to be a dependable design partner for our company.
Gemini handled multiple projects each month while maintaining consistent quality and attention to detail. The plan sets were clear, complete, and organized for both permitting and installation. Whether it was a straightforward Enphase system or a more involved project incorporating battery storage and whole-home backup, Sanjay understood the equipment and system requirements.
Revisions were always handled smoothly. Changes from customers, permitting departments, utilities, and field conditions are a normal part of solar construction, and Sanjay was responsive whenever updates were required. He understood the importance of turnaround time and helped us keep projects moving.
What we appreciated most was his ability to manage a steady volume of work without creating unnecessary complications for our team. Communication was straightforward, projects remained organized, and we could depend on him to handle the design work professionally.
We would recommend Gemini Solar Design to any solar contractor looking for a knowledgeable and reliable design partner capable of supporting an ongoing project pipeline.
Corey Gordon
Gordon Construction and Design, Inc. · Repeat Client
I wanted to say thank you. Working with you on my solar project was a great experience from start to finish. I wasn’t sure it was something I could take on as a DIY project, but your communication and technical support made it possible. After talking with you about it, I felt better about taking it on, though I was still a little skeptical. Once I received your plans, I saw that they were professional, clean, and easy to read.
I knew that for my next project, you were the one to call, and I received the same great enthusiasm and quality of work from you as I did on the first project. Thank you again.
Ricardo Pino, P.E.
Electrical Engineer · EnerGrid
I’ve had the pleasure of working with Sanjay and Gemini Solar Design on PV design and engineering projects, and I’ve been very pleased with the experience. Sanjay is knowledgeable, honest, and straightforward, and he consistently provides well-prepared and technically sound designs. He is easy to communicate with, responsive, and always makes sure the project requirements are clear.
I would highly recommend Sanjay and Gemini Solar Design to anyone looking for a knowledgeable and reliable PV design professional.
Adam Rollins
Sales Manager & Program Manager · Power Hub Dynamics, LLC
We had the opportunity to work with Sanjay, and it was a great experience from start to finish. He is very cooperative, understands the business and technical side of the work well, and is always responsive and easy to communicate with.
Sanjay takes the time to understand the client’s needs and works with you to make sure everything is handled properly. His professionalism, communication, and willingness to cooperate made the entire process smooth and straightforward.
We truly appreciate his support and would be happy to work with him again.
Charles Newhouse
Newhouse Electric · 180-Panel Ground-Mount Solar Project
I had an excellent experience working with Sanjay at Gemini Solar Design on the engineering and design of my solar project.
My system was more complex than a typical residential solar installation, consisting of 180 ground-mounted solar panels using Enphase microinverters. I needed a complete set of professionally engineered drawings that would meet the requirements of my local power company, Ameren, as well as my local Authority Having Jurisdiction (AHJ).
Sanjay did an outstanding job designing the system and providing drawings that were detailed and accurate, while still being clear enough for me to use throughout the actual construction. I was able to read and interpret his plans to build the system, run the wiring, order the required equipment, and complete the installation.
There were a few times when I had questions or needed clarification on the drawings. Sanjay was always very responsive and typically answered my questions the same day. I especially appreciated his willingness and eagerness to help rather than simply providing the drawings and considering the job finished.
Another thing that impressed me was the accuracy of the equipment specifications. With a system this large, many of the components are expensive, and ordering incorrect equipment could have resulted in costly returns and significant delays. I ordered the equipment Sanjay specified, and everything worked as intended. I had no issues or returns involving the major equipment he called out in the design.
Most importantly, my local AHJ approved the engineered drawings, which allowed my project to continue without setbacks to my construction timeline.
From the engineering and equipment specifications to his responsiveness throughout the installation, I was extremely pleased with Sanjay. I would confidently recommend them to anyone needing professional solar engineering and design services, especially for a large or complex solar project.
Richard Jacks
Managing Partner · Romerica Holdings LLC
Sanjay has been a joy to work with. He is always pleasant and eager to help with his wise advice and sensible approach to problem solving. His work reflects his mastery of his profession. He has completed our projects promptly, and gets them right the first time. I look forward to using him again in the future.
Homeowner & DIY Projects
Jim Bortolini
Las Vegas, Nevada · DIY Solar Homeowner · Engineer
Google ReviewSanjay provided lots of interesting and detailed information on his website, which most consultants either can't or won't do. The quality of these examples lead me to solicit his help with my DIY system. We came up with a solution of 64 panels in 4 arrays.
I am an engineer, which is the worst type of customer for a consulting group. Sanjay impressed me by taking my initial "design" and optimizing it to eliminate items that I didn't need. That simplification alone more than paid the engineering costs that Gemini Solar Design charged me.
Then, when my county permitting organization changed the design, Sanjay was willing to work with me to help incorporate those changes without charging excessive amounts.
My bills in Las Vegas went from over $5000 per year to $250 dollars, even after we purchased 2 new electric vehicles.
If you want to do it yourself, make sure the foundation you build on is solid. That's what this vendor provides.
Scott Burton
Warwick, Rhode Island · DIY Owner-Builder · 9.6 kW Carport + Battery Backup
I hired Gemini Solar Design for the permit plan set on my owner-builder solar project: a 9.6 kW carport array with DC-coupled battery storage and whole-home backup. I gave him a pile of scattered inputs and thoughts and he turned them into a clean, thorough package. He's sharp, responsive through every round of questions and revisions, and easy to work with. I'd hire him again and recommend him to anyone who needs a PV design done right.
Todd Altieri
Oxford, North Carolina · DIY Solar Homeowner
Thank you Sanjay for all your help with my project. I had a very unique situation and you were such a help to get my project designed correctly. You were patient and very knowledgeable. The end product was professional and well done. I can’t recommend you enough for those DIY people out there that are looking for a solid designer for their project.
Stephen Roney
Cumming, Iowa · DIY Solar Homeowner
Sanjay was super helpful in my personal project at my house. I sourced all my own materials, but needed an expert to put together the plans. It was hard to find one, so finding Sanjay was great. You could tell he cared from the git-go. I'd recommend him and his service. Super helpful!
Lee Rutledge
Akron, Ohio · DIY Solar Homeowner
Sanjay’s work was first rate, prompt and was all done for the quoted price. I did the work myself by following his plans and it went very well. His drawings were approved without any problems by my local authority and my site inspection was approved on the first visit. The system has been working well now for over two years.
Charles Hill
Harpers Ferry, West Virginia · 21.5 kW Roof + Solar Carport
My project was a combination 40-panel, 21.5 kW, system split between a multifaceted, 3-story roof and a solar carport, using a mix of EG4 GridBoss/FlexBoss strings with NEP micro-inverters thrown in for good measure. A little bit of everything.
Sanjay patiently worked with me through multiple revisions and his experience was vital to seeing my project through to the end with zero push back from either my AHJ or the power company.
With such a complex project I had a bunch of things to worry about -- but not design documentation. The first time was the charm!
Chris Wilson
DIY Solar Homeowner
Google ReviewSanjay was very responsive when working with me on designing DIY installed system using Enphase hardware and REC solar panels. I was installing my solar arrays in phases due to costs. All plans were accepted at the permit office and by the utility without any issues and it only took about a week to get the final plans including the Engineering stamps needed. The plans were easy to follow and allowed my electrician to understand the connections they needed to do and the wire size needed for each section.
My system has been running perfectly since 2022 and I have the confidence that it was designed and installed correctly for my location. I would highly recommend Gemini Solar Design to anyone looking for professionally made plans with engineer stamps.
Mike Bergelson
DIY Solar Homeowner · Approx. 12 kW / 33 Panels
Google ReviewSanjay designed a 33-panel (~ 12 kW) system that we installed ourselves on our roof. He did an awesome job throughout the process. He provided great advice on various design decisions and his plan set was accepted without issue by the planning department of our local municipality. Additionally, he helped with the interconnect agreement with our energy company (PG&E) so that process was also a breeze.
Worth mentioning - he's a very good egg and easy going and (seemed) happy to spend time on the phone answering what I'm sure were some pretty basic questions. I can't recommend him highly enough!
Krystopher Rugazi
Shelter Cove, California · DIY Off-Grid Solar Homeowner · Victron System
I came to Gemini Solar Design with a fairly complex DIY off-grid solar project using Victron equipment, battery storage, generator backup, and whole-home power. I had a good idea of what I wanted to build, but needed someone who could turn all of those pieces into a complete, code-compliant design.
Sanjay took the time to understand the system and worked through the inverter setup, battery bank, charge controllers, rapid shutdown, grounding, disconnects, conductor sizing, and protection requirements. The final plan set was detailed, professional, and gave me a clear roadmap for the installation.
As an owner-builder, I especially appreciated that the design was specific to my project rather than a generic template. Sanjay was responsive, knowledgeable, and willing to work through the unusual aspects of the system.
I would definitely recommend Gemini Solar Design to anyone building a DIY, off-grid, battery-based, or other non-standard solar system.
Have a Solar Project?
Send a quick inquiry if you want to discuss the project first, or go directly to the full design request form if you already have the project information ready.