Tesla Powerwall 3
Backup power, solar integration, and room to expand—planned around the loads that matter to your household.
BD Electrical & Solar assesses your electrical service, existing solar and backup priorities to design a system for your home.
Image courtesy of Tesla, Inc. BD Electrical & Solar is a Certified Tesla Energy Installer.
Why choose Powerwall 3?
Powerwall 3 combines battery storage with an integrated solar inverter. It can serve new solar projects or compatible existing systems. Backup coverage and runtime depend on your equipment, energy use, and system configuration.
Backup sized for your loads
Whole-home or selected-load backup starts with an electrical assessment. We review simultaneous demand, motor starting loads, and runtime goals before recommending the number of batteries and any load management.
Make better use of solar
Store solar production for later and manage your backup reserve in the Tesla app. Bill savings depend on your rate, export credits, operating settings, and eligible utility programs.
Plan for Massachusetts weather
Equipment location, clearances, temperature, snow, and flood exposure matter. We select an installation location that meets manufacturer and local requirements.
Power and energy. Planned together.
Per Powerwall 3. Output depends on configuration; warranty is subject to Tesla’s applicable terms. Stored energy affects runtime. Output determines how much equipment can operate at once.
One simple, scalable solution.
- 13.5 kWh nominal stored energy per Powerwall 3.
- Integrated solar inverter; compatible transfer controls, metering, and electrical protection are still required.
- Additional Powerwall units can add output and storage. Expansion units add stored energy and runtime, not inverter output.
- Current US design guidance supports up to four Powerwall 3 units and three Expansion units, subject to equipment compatibility and site design.
- 10-year limited warranty, subject to Tesla’s applicable terms.
BD coordinates the installation scope, permits, utility requirements, commissioning, and customer handoff. The proposal identifies required electrical work and the equipment included.
For solar-only homes, EV owners, battery retrofits and new construction.
Coordinate EV charging and Powershare.
Charging an EV uses substantial energy. We plan charging priorities alongside household loads so vehicle charging does not unexpectedly consume your outage reserve. With Tesla Powershare, an eligible Cybertruck, Model 3 or Model Y can extend backup through Powerwall 3 and a Wall Connector 3 or Universal Wall Connector. Vehicle eligibility, software and site pairing must be confirmed. Powerwall 2 and Powerwall+ support is listed by Tesla as coming soon.
Review Tesla Powershare requirements or explore Tesla Wall Connector installation.
Explore Tesla Powershare with BD · Explore Residential EV Charging
Part of a complete home energy system.
BD designed and installed a Middleborough system combining rooftop and pole-mounted solar, Tesla Powerwall storage, SPAN controls, and Level 2 EV charging. With limited roof space, we coordinated additional solar generation with the home’s storage, electrical distribution, and backup priorities.
Our scope included foundations, underground electrical infrastructure, battery and backup controls, utility interconnection, and commissioning. Circuit-level controls help the homeowner prioritize available battery energy during an outage.
Powerwall questions, answered.
How many batteries will I need?
We size for both power and energy: which loads run together, motor starting requirements, and how long you want backup. Expansion batteries add stored energy and runtime without adding inverter output.
How long will backup last?
Runtime depends on available charge, backup reserve, household consumption and solar production. For illustration, 10 kWh available to your backed-up loads would supply an average 1 kW load for about 10 hours before losses and operating limits. Heating, cooling and EV charging can use energy much faster.
Can Powerwall be added to existing solar?
Often, yes. BD reviews your existing inverter, electrical design and utility requirements to determine a compatible configuration.
Will Powerwall lower my electric bill?
Potential savings depend on your utility rate, solar export credits, operating settings and eligible programs. We evaluate those details rather than assume that storing solar always saves more than exporting it.
Can it be installed outdoors?
Powerwall 3 is rated for indoor and outdoor use. BD selects a location that meets Tesla’s instructions and local requirements, accounting for clearances, temperatures, snow and flood exposure.
How long does the project take?
On-site installation is one part of the process. Design, permitting, utility coordination, inspections and commissioning also affect the schedule. Your proposal and project plan identify the scope and expected milestones.
Can I permanently disconnect from the grid?
Temporary outage backup is different from designing a permanently off-grid home. A separate assessment must account for seasonal solar production, extended poor weather, energy use and any additional backup sources.
What warranty applies?
Tesla provides a 10-year limited product warranty subject to its applicable terms. BD installation workmanship coverage is stated separately in your agreement.
Let’s plan your Powerwall system.
Start with a consultation about your home, electrical service, existing solar, and backup priorities. We will outline the equipment and installation scope needed for your goals. Serving homeowners across Massachusetts.
Carver & Gloucester, MA · 508-617-0800