If you drive a Tesla, Powershare with Powerwall 3 is the better backup for most Texas homes. It takes over in under a second (a standby generator usually takes 15 to 30 seconds), makes no noise, needs no fuel or oil changes, and your car adds days of backup on top of Powerwall. A standby generator still makes sense for very large homes and for people who need to ride out outages that last weeks.
We install both. Our crews put in Generac and Kohler standby generators, and we were among the first in the US to install Tesla Powershare, starting with Cybertruck. Here is how they compare on real jobs.
Side by side
| Powershare with Powerwall 3 | Standby generator | |
|---|---|---|
| When the power goes out | Powerwall 3 takes over in under a second, so most people don’t notice | The lights go out for a few seconds while the engine starts and the transfer switch kicks in |
| Noise | Silent | Loud. An engine running outside during an outage, plus a self-test it runs on its own every week or month, depending on the model |
| Maintenance | None | Oil, filters, plugs and battery. Service plans run about $200 to $650 a year |
| Fuel | None. The car and Powerwall 3 refill from the grid, solar or a drive to a working charger | Natural gas line or propane tank |
| Cost to run in an outage | Whatever it cost to charge the batteries beforehand, at your normal electricity rate. With solar, close to nothing | About $30 to $40 a day on natural gas for a 20 kW unit, $150 to $170 on propane |
| On a normal day | Powerwall 3 stores energy every day and can earn money in virtual power plant programs | Sits idle until the next outage |
| Exhaust | None | Engine exhaust, including carbon monoxide, so it has to sit outside with clearances |
| HOA and placement | Mounted on the wall, no exhaust. Some HOAs still review outside equipment | Outdoor pad with code clearances. Many HOAs review placement and screening |
| Warranty | Powerwall 3: Tesla’s 10-year limited warranty. Your Tesla’s battery: its 8-year Battery and Drive Unit warranty | Manufacturer warranty, length depends on the brand and model |
| How long it lasts | Our standard package of two Powerwall 3 holds 27 kWh, about 22 hours for a home using 30 kWh a day. Your car adds up to 2 days or more (Model 3 or Model Y, depending on trim) or over 3 days (Cybertruck). Solar refills it every sunny day | As long as fuel flows. Natural gas has no tank to run dry |
| Car not home? | Powerwall 3 runs the house by itself. The car adds backup when it’s plugged in | Doesn’t matter |
| Big loads | Each Powerwall 3 puts out 11.5 kW. We add Powerwall 3 units for bigger homes, and our HVAC partner adds soft starts on large AC | A properly sized unit starts large AC and well pumps easily |
| Whole-home backup | Yes, with a whole-home Gateway 3 | Yes, with a whole-home transfer switch |
| Upfront cost | Priced per home. Financing available | Our installs start at about $15,000 and can easily reach $30,000, depending on the unit, gas line and electrical work |
We don’t publish one price for Powerwall 3 with Powershare because it depends on the home: how many Powerwall 3 units, whole-home or partial backup, the panel and where the Wall Connector goes. We quote it from photos, usually the same day.
What the table doesn’t show
Most outages are hours, not weeks
Most Texas outages last a few hours to a couple of days, and Powershare handles those easily. Powerwall 3 runs the house first, and when it gets low, your car takes over and refills it. For the rare outage that lasts longer, solar or a drive to a working charger keeps you going. We ran the numbers against real outages in our Uri and Beryl backtest.
Powerwall works every day, not just in an outage
A generator sits in the yard waiting for the next storm, and in the meantime it still needs oil changes, filters, a steady gas supply and its regular self-test. Powerwall 3 needs none of that, and it stores energy every day. With solar, it covers your evenings. In Austin Energy’s area, owners may qualify for the Power Partner Battery program, and in areas with electricity choice, virtual power plant programs pay owners to share stored energy with the grid.
We size it for Texas heat
A Texas summer outage means air conditioning, and in a freeze we keep the heat on and skip the strips. Both are big loads. We size the number of Powerwall 3 units to your home, and our HVAC partner adds soft starts on large AC units so everything starts smoothly. Our guide to Powershare backup in summer vs winter shows how long it lasts in each season.
Which one fits your home
Powershare fits if…
You drive a Powershare-capable Tesla, want quiet backup with no engine to service, or have a strict HOA or no gas line. Have solar or plan to get it? Even better: the batteries refill every day the sun is out, even in a long outage.
A generator still makes sense if…
You have a very large home, run big loads like a pool, shop or several AC systems, need to ride out outages that last weeks, or don’t drive a Powershare-capable Tesla.
Not sure?
We install both. A load calculation from your panel photos usually makes the answer clear.
Next steps: check whether your car qualifies with our 30-second Powershare check, see which Wall Connector works with Powershare, or, if you already have a battery, read adding Powershare to Powerwall 3. Cybertruck owners can compare Gateway only vs Powerwall 3. For generators, see our home standby generator page, and for Powershare, our Tesla Powershare installation page.
Outage on the way? Here’s how to make your Powershare backup last longer.
See if Powershare fits your home
Send photos of your electrical panel and meter and tell us what you want to keep running. We’ll quote Powershare, and a generator too if you want to compare, usually the same day. Our own electricians pull the permit and meet the inspector, and if an inspection fails, we fix it.
Powershare vs generator: FAQ
Is Tesla Powershare better than a generator?
For most Texas homes with a Powershare-capable Tesla, yes. It takes over in under a second, is silent, needs no fuel or maintenance, and Powerwall 3 is useful every day, not just in an outage. A natural gas generator is still the better fit for very large homes and for outages that last weeks.
How long can Powershare run my house compared to a generator?
Our standard package of two Powerwall 3 holds 27 kWh, which runs a home using 30 kWh a day for about 22 hours. Add your car and Tesla estimates a Model 3 or Model Y adds up to 2 days (Standard) or over 2 days (Premium and Performance), and a Cybertruck over 3 days, starting from a 90 percent charge. Bigger homes can add more Powerwall 3 units, and with solar, the batteries refill every sunny day. A natural gas generator keeps going as long as the gas supply holds.
How much does a standby generator cost in Texas?
Our standby generator installs start at about $15,000 and can easily reach $30,000. The final price depends on the size of the unit, the gas line run and the electrical work. We quote every generator and Powershare job per home from photos.
Does Powershare work if my car isn’t home during an outage?
Yes. Powerwall 3 runs the home on its own. The car adds backup when it is plugged into the Wall Connector at home.
Which is quieter, Powershare or a generator?
Powershare. It is silent. A standby generator is an engine running outside your home, and it also runs a self-test on its own every week or month, depending on the model, even when the power is on.
Does Charge Pro install both?
Yes. We install Tesla Powershare and Powerwall 3, and Generac and Kohler home standby generators. Our own licensed electricians do the electrical work on both.
Sources
- Powershare support page (Tesla)
- Powershare (Tesla)
- Cybertruck Owner’s Manual: Powershare Home Backup (Tesla)
- How much does a whole house generator cost? (HomeGuide)