Tesla Powerwall
Certified Tesla Powerwall installer.
Sespe Power Solutions is a Tesla Certified Installer for Powerwall 3 in Ventura County, California. A single Powerwall 3 stores 13.5 kWh of usable energy, delivers 11.5 kW continuous power (enough to run a typical home with central AC), and includes a built-in solar inverter. Installed cost is $13,500–$16,500 before the 30% federal tax credit.
- Certified Tesla Powerwall installer
- 13.5 kWh usable capacity per Powerwall
- Seamless integration with solar or standalone
- App-based monitoring and Storm Watch mode
Powerwall delivers whole-home backup that integrates beautifully with your solar array. We're certified installers and handle every step — site survey, permits, install, utility interconnection, and Tesla app setup.
Powerwall specs
- 13.5 kWh usable capacity
- 11.5 kW continuous power, 30 kW peak (5s)
- 97.5% round-trip efficiency
- Operating range -20°C to 50°C
- 10-year warranty
Features
- Automatic outage detection and switchover
- Time-based control to avoid peak rates
- Storm Watch pre-charging
- Stackable for extra capacity
- Full permit and utility interconnection handling
Frequently asked questions
Is Powerwall 3 better than Powerwall 2?+
Yes. Powerwall 3 has 11.5 kW continuous output (vs 5 kW), a built-in solar inverter, and better surge handling for AC compressors and EV charging. We only install Powerwall 3 on new projects in 2026.
Do I need a permit to install a Tesla Powerwall in Ventura?+
Yes — every city in Ventura County and unincorporated county requires an electrical permit and SCE interconnection. We handle both.
How many Powerwalls do I need for whole-home backup?+
Most 1,800–3,000 sq ft Ventura County homes (central AC, no EV charging during outage) are well served by one Powerwall 3. Larger homes or two-EV households typically need two.
Can Powerwall 3 work with non-Tesla solar?+
Yes. Powerwall 3 includes a built-in inverter that works with any compatible third-party panels. Powerwall 2 also works with virtually any existing array via AC coupling.
How long does a Powerwall installation take?+
Active install is one day. End-to-end timeline (permit + SCE interconnection + Tesla activation) is typically 4–8 weeks.
What's the warranty?+
10-year unlimited-cycles warranty from Tesla, 70% capacity retention guaranteed at year 10. Sespe adds a 10-year workmanship warranty on the install itself.
Let's see what the sun can do for your home or business.
Solar, battery, EV chargers, panel upgrades, commercial work — we'll do the math, design the system, and tell you straight what makes sense. No high-pressure pitch.