Berkeley
1958 Brown Shingle
8.5 kW Solar · 28.6 kWh Battery
“The value proposition is bang on. Installation was really professional. ... They were even helping with all the paperwork afterwards.”
Alexander K. · Google review
Certified EG4 Elite Installer
View our certificateThe Bay Area's
EG4 installer.
We handle the permits and the PG&E interconnection, so you do not have to.
Prefer to talk? Call (415) 873-3463.
Most installers will not touch EG4.
It is all we do.
If you have called around, you already know the pattern. You say EG4, and the conversation goes quiet, because most shops would rather sell you Tesla or Enphase. We are the opposite kind of shop, and we pick up the phone.
Two ways to work with us. Both end with EG4, installed and permitted.
Buy through us
Turnkey
Have not bought yet? We design the system, supply the EG4 hardware at our dealer pricing, install it, and pull the permits.
Bring your own
Labor-only
Already have your EG4, or buying it from Signature Solar? We will install and permit what you have, after a quick check that the configuration will pass California inspection and PG&E.
DIY is real with EG4. Here is what hiring us actually buys.
What stops most people is not the wiring. It is everything around it.
- Permits and inspection, including fire-country rules in the hills.
- PG&E interconnection and Permission to Operate, the paperwork that can drag on for months.
- The UL 9540A listing and code sign-off, NEC and rapid shutdown, matched to your exact configuration.
- A manufacturer warranty that stays valid because the system was installed and registered to spec.
- The high-voltage work. And the months of weekends.
I am an electrical engineer. On my own home, the wiring was the easy part. The rest was not, and I did not see it coming. I started Potrero so the next person would not have to learn that the hard way. We will model your job both ways, your own labor against a full install, and if you are better off doing it yourself, I will tell you.
Why we bet the whole company on EG4.
Same reasons you did. Here is what our side of that bet buys you. Because we install nothing else, the crew at your house has wired your exact system many times over, and EG4’s pricing reaches you intact instead of getting marked up like a premium brand.
- Priced through
- No premium-badge markup. You get EG4 pricing, not a margin on top.
- Practiced
- Your exact inverters and batteries, installed by a crew that has done this many times, not once.
Built for people who almost did it themselves.
Pacifica
1966 Tudor
12.1 kW Solar · 28.6 kWh Battery
“After a long search for a solar installer, which included getting a bunch of quotes and even seriously considering a complex DIY project, I was about to give up. ... They standardize on a single, solid system (the EG4 system which I was already a fan of since they are so well regarded in the DIY space).”
Andres M. · Google review
Burlingame
1912 Renovated
14.5 kW Solar · 28.6 kWh Battery
“Even after installation, they've continued supporting me to optimize performance.”
Ankur S. · Google review
What it costs, and what you actually get.
We scope your site, then model it both ways: full turnkey, or labor-only on hardware you supply. You get one designer who runs the project end to end and signs off on the install, not a salesperson who hands you to a subcontractor.
Turnkey system range
$20kto$50k
All in: EG4 battery, inverters, smart panel, solar, permitting, and the PG&E interconnection.
Labor-only, on hardware you supplyfrom $8k
Solar-plus-battery payback
5-12 yrs
Battery warranty
10 yr
Panel warranty
25 yr
Workmanship
10 yr
Questions EG4 buyers ask us.
Yes. We will install and permit hardware you bought, after a quick check that the configuration is CEC-listed and will pass inspection and PG&E.
That is the part we own. We pull permits, match your build to the UL 9540A system-level listing, and file the interconnection through Permission to Operate.
We check that before any work starts. We will not begin a project unless we are confident it can be completed and pass California inspection and PG&E, so you are never stuck with a half-finished system. If your hardware or layout needs to change to get there, you will know up front.
Yes, routinely. We add EG4 storage to an existing solar array, after a quick check that your current array and inverter will work with it.
Yes. We install and register to spec, which is what keeps the manufacturer warranty intact, and we add our own workmanship warranty on the labor.
Most installs are finished and inspected within one to three months of signing, depending on system size and permitting. From there we file the PG&E interconnection and shepherd it through Permission to Operate, the step that runs on the utility timeline.
Turnkey systems typically run $20k to $50k depending on size and whether solar is included. Labor-only, on hardware you supply, starts at $8k. We show you the math both ways before you commit.
Tell us what you’ve got.
Whether your EG4 is already in the garage or still in a cart, tell us where you are and what you are running. We will scope it, model turnkey against labor-only, and get back to you with the numbers.