We don’t sell black boxes.
You should know exactly what goes on your roof and in your garage, and why. Every part of a Potrero system is built on open standards and made by a company you can look up. Nothing proprietary, nothing that locks you into one vendor for the life of the system.
The parts list, in the open.
Five components, each one named and made by a company you can look up. Here is exactly what goes on your house, down to the dimensions.
- PanelsOptivolt
- Most installers skip the shaded spots and let the shade drag the rest of the roof down. Optivolt panels have built-in circuitry that keeps producing through a chimney’s shadow, a tree, or Bay Area fog, so a small, chopped-up roof can still reach up to 2× the lifetime production of a standard install.67.8" × 44.6" × 1.4" per panel · 47 lb · 450 W
- BatteryEG4 PowerPro
- Two wall-mounted, all-weather EG4 PowerPro batteries, about 30 kWh in all, roughly 3× the California average. Under NEM 3.0 that is what lets you run the house on your own afternoon solar straight through the evening peak, instead of buying it back from PG&E at the higher rate.34.6" H × 22.3" W × 9.1" D · 309 lb · 14.3 kWh each
- InverterEG4 FlexBoss21
- One box doing three jobs: it pulls power off the panels, charges the battery, and converts stored power into the electricity your home runs on, including when the grid is down. The FlexBoss21 delivers 12 kW continuously and takes in up to 21 kW of solar.30.4" H × 22.3" W × 11.2" D · 121 lb
- Smart panelEG4 GridBoss
- The hub everything lands in. Utility power, the inverters, a generator, and your backed-up circuits all meet in a single 200A panel, and the GridBoss is what lets the battery carry a new EV charger or heat pump on your existing line. That is how most homes skip PG&E’s $10,000 to $30,000 service upgrade.31.5" H × 19.7" W × 7.0" D · 60 lb
- SoftwareElastic Energy
- The brain. Elastic Energy runs the whole system from one app, deciding minute to minute when to store solar, when to run the house on the battery, and when to send power back, all against PG&E’s hourly rates. Because it speaks to hardware from any brand, it folds in whatever you add later instead of tying you to one maker.
Open on purpose.
The most expensive thing in solar is not the panel or the battery. It is ripping out a working system in year 8 because one part failed, a vendor discontinued a line, or the new thing would not talk to the old one. Everything here is open and widely available, so it can be serviced, expanded, and repriced by more than one company. A system you add to, not one you throw out.
- Serviceable
- Standard, widely stocked parts. A failure in year 9 is a repair, not a teardown.
- Expandable
- A fuel cell, generator, EV charger, or whatever comes next plugs into what you already own.
- Yours to price
- Hardware anyone can buy and quote, so you are never captive to one vendor’s prices.
Questions worth asking.
EG4 is widely installed, built on lithium iron phosphate (LFP) chemistry, and made to open standards. We install nothing else, so the crew at your home has wired your exact system many times over. The point of choosing EG4 is that its pricing reaches you without a premium-badge markup, not that you are getting less.
Solar panels with built-in circuitry that keeps producing when part of the array is shaded by a chimney, a tree, or fog. On the small, broken-up roofs common in the Bay Area, that is how the same roof can reach up to twice the lifetime production of a standard install.
Yes. The battery uses lithium iron phosphate chemistry, the type least prone to thermal runaway, the system matches a UL 9540A listing, and the components are CEC-listed. Those listings are what California inspection and PG&E require before a system can be switched on.
Yes. Everything is built on open standards, so a fuel cell, backup generator, EV charger, or whatever comes next plugs into what you already own instead of forcing a rip-and-replace.
Because the hardware is open and widely stocked, a failure years from now is a repair, not a teardown. You are not captive to a single vendor who can strand you by discontinuing a proprietary line.
Each component carries its own manufacturer warranty, and we install and register to spec to keep that intact. On top of that, Potrero adds a workmanship warranty on the labor. The manufacturer warranty for each part lives on its product page, linked in the parts list above.
Those are well-made, but they are closed systems: proprietary hardware, one company setting the price, and a teardown when you want to change something. We chose open, serviceable hardware because it lowers your cost over the life of the system, which is the whole reason to go solar in the first place.
Same price.
Twice the value.
A 30-minute design review with the engineer who would design your system. We look at your roof, bill, panel, backup needs, and goals before recommending anything.