Whole-home backup
Multi-Powerwall installation for true whole-home backup.
Two, three, or more Powerwalls for backup that covers everything, A/C, EV charging, well pumps, and every circuit in between, sized from your actual usage data.
What’s included
- Whole-home backup including A/C, EV charging, and well pumps
- System sizing based on your real interval usage data
- Certified installation across all units with warranty registration
$20,000–$45,000
Typical cost
Whole-home
Coverage
10 yrs
Warranty
Whole-home backup
Whole-home backup means every circuit stays live, not just the essentials.
A single Powerwall is enough for the fridge and a few outlets. Multiple units let air conditioning, EV charging, well pumps, and every other circuit in the house keep running through an extended outage.
We calculate the exact number of units your home needs using your utility's interval data, including a look at what your last real outage would have required.
- Full-home load coverage, not just essential circuits
- Sized using your utility's real interval consumption data
- Supports simultaneous A/C, EV charging, and well pump loads
- Expandable design if your loads grow later
Whole-home backup
Multiple units require careful electrical planning, not just more batteries.
Panel capacity, Backup Gateway configuration, and physical mounting layout all matter more as the system scales. We plan the full electrical design before any unit is installed.
Every multi-unit system includes permitting, inspection, and the same workmanship guarantee as a single-unit install.
- Full electrical and panel capacity planning
- Backup Gateway configuration for multiple units
- Clean, organized wall-mounted installation
- Permit, inspection, and workmanship guarantee included
Common questions
How many Powerwalls do I need for whole-home backup?
Most whole-home setups with A/C and EV charging use three or more units. A load assessment using your actual usage data confirms the exact number for your home.
Can Powerwalls of different generations be combined?
Compatibility depends on the specific models. We review your existing system, if any, and confirm the best configuration before recommending additional units.
Do multiple Powerwalls require a panel upgrade?
Not always. We evaluate your panel's capacity as part of the design and only recommend an upgrade if it's genuinely needed to support the system.
Free estimate
Get a multi-Powerwall system built for true whole-home backup.
Talk with a certified installer, get a load-based unit-count recommendation, and confirm panel capacity before any work starts.