Tesla Powerwall 3 vs
Enphase IQ Battery 5P.
Both are on the SMUD approved list. Both qualify for the rebate. They are different products for different homes. Here's the side-by-side so you can see which one fits your situation before you talk to anyone.
Get a Free QuoteTwo batteries. Both solid.
Different strengths.
Tesla Powerwall 3
13.5 kWh per unit
A single, large unit with a solar inverter built in. Designed for new solar plus battery installs. Higher continuous power output. Earns the SMUD quarterly VPP payment of $110 per unit per quarter. 10-year warranty.
Best for: New solar plus battery builds, larger homes, homeowners who want the SMUD VPP quarterly payment, or homes that need high continuous backup power.
Enphase IQ Battery 5P
5 kWh per unit, up to 4 units
A modular system. Start with 5 kWh and add more later in 5 kWh increments. Native pairing with Enphase microinverter solar. Longer 15-year warranty. Qualifies for the SMUD one-time rebate but not the quarterly VPP payment.
Best for: Homes with existing Enphase solar, homeowners who want to start smaller and expand, or installations where a modular approach fits the electrical layout better.
The full comparison.
| Tesla Powerwall 3 | Enphase IQ Battery 5P | |
|---|---|---|
| Usable capacity per unit | 13.5 kWh | 5 kWh |
| Max units per home | 4 | 4 (20 kWh total) |
| Inverter | Built-in (no separate inverter needed) | Requires Enphase microinverters or IQ System Controller |
| Continuous power output | 11.5 kW continuous | 3.84 kW per unit (up to 7.68 kW with two units) |
| SMUD one-time rebate | ~$5,400 per unit (subject to SMUD program terms) | ~$2,000 per unit (subject to SMUD program terms) |
| SMUD VPP quarterly payment | $110/unit/quarter [CONFIRM Revolt Tesla status] | Not currently available for Enphase |
| Warranty | 10 years | 15 years |
| Expandable | Yes, add units | Yes, modular in 5 kWh increments |
| Works with existing solar | Yes (most inverter types, some limitations) | Native pairing with Enphase microinverters |
| Installation footprint | Single wall-mounted unit | Stacked modular units, flexible placement |
| Monitoring | Tesla app | Enphase Enlighten app |
| Best fits | New solar + battery builds, high backup needs, SMUD VPP income | Existing Enphase solar, modular expansion, longer warranty priority |
SMUD rebate amounts are estimates calculated at $500 per kWh minus 20% holdback, subject to current SMUD My Energy Optimizer Partner+ program terms. Verify at smud.org before signing. [CONFIRM Revolt Services Tesla Certified Installer status for VPP quarterly payment eligibility.]
When the Powerwall 3
makes more sense.
-
You're doing a new solar plus battery install. The Powerwall 3's built-in inverter simplifies the electrical design and removes the cost of a separate solar inverter.
-
You want the SMUD VPP quarterly payment. $110 per Powerwall per quarter adds up to $440/year per unit. Over a 10-year period, that's $4,400 per Powerwall beyond the one-time rebate. Enphase doesn't currently qualify.
-
You need high continuous power. The Powerwall 3 outputs 11.5 kW continuous per unit. That's enough to run air conditioning, a well pump, and appliances simultaneously during an outage.
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You want more capacity per unit. At 13.5 kWh, one Powerwall 3 holds nearly three times what a single Enphase 5P holds. Fewer units for the same storage capacity.
-
You are in SMUD territory and want to maximize the total incentive stack. One-time rebate plus quarterly VPP payments gives Powerwall a long-term income advantage over Enphase for SMUD customers.
When the Enphase 5P
makes more sense.
-
You already have Enphase microinverters. The IQ Battery 5P integrates natively with Enphase solar systems. Adding Enphase storage avoids a separate inverter or compatibility work.
-
You want a longer warranty. 15 years vs 10 years. For a homeowner planning to stay in the home for the long term, the extra 5 years of coverage matters.
-
You want to start smaller. Start with one 5 kWh unit and add more later in 5 kWh increments up to 20 kWh. Spreads the upfront cost over time as your budget allows.
-
Your electrical or physical space constraints favor modular units. Enphase units stack and can be placed in tighter or split electrical configurations where a single large Powerwall unit wouldn't fit as cleanly.
-
You are on PG&E and the VPP quarterly payment is not a priority. Since SMUD VPP only pays for Powerwall, PG&E customers with existing Enphase solar lose nothing by staying within the Enphase ecosystem.
We don't push one over the other.
We ask which fits your home.
Both are quality products from established manufacturers. The comparison table above shows the real differences. Neither is universally better.
The main decision points come down to three things. First, do you already have Enphase solar? If yes, IQ Battery 5P is the natural path. Second, are you in SMUD territory and want the VPP quarterly payments? If yes, Powerwall 3 gives you more over the long run. Third, what backup power level do you need? Powerwall 3 handles more load simultaneously.
At the free consult, we look at your existing solar setup if you have one, your utility, your usage, and your electrical panel. We then tell you which battery works better for your specific situation, not which one is more profitable to sell you.
Also worth reading.
Home Battery
Full battery service page. What's included, install timeline, SMUD rebate filing.
See the service →SMUD Rebate
Up to $10,000 per home. 90-day window from PTO. We file the paperwork.
Full details →Battery Backup Power
What stays on during an outage. How long each battery lasts. How to size your backup load.
Learn more →NEM 3.0
Why a battery is practically required for new PG&E solar customers in 2026.
Read the explainer →Powerwall vs Enphase questions
we hear every week.
Which battery qualifies for the SMUD rebate?
Both qualify for the SMUD My Energy Optimizer Partner+ one-time enrollment incentive. Powerwall 3 earns roughly $5,400 per unit (13.5 kWh at $500/kWh minus 20% holdback). Enphase IQ Battery 5P earns roughly $2,000 per unit (5 kWh). The Powerwall 3 also qualifies for the $110/quarter SMUD VPP payment. Enphase does not currently qualify for the quarterly payment. Both are subject to current SMUD program terms. Verify at smud.org.
Can I mix Powerwall and Enphase on the same home?
Generally no. Powerwall 3 has an integrated inverter and works as a standalone system. Enphase IQ Battery 5P is designed to pair with Enphase microinverters. Mixing brands typically creates incompatible systems and adds cost. We'll tell you at the consult which battery pairs correctly with your existing or planned inverter setup.
Which battery lasts longer?
Enphase IQ Battery 5P comes with a 15-year warranty. Tesla Powerwall 3 comes with a 10-year warranty. Both cover defects and capacity retention. The longer Enphase warranty is a real advantage for homeowners focused on long-term ownership. After the warranty period, both batteries can still function but are no longer covered by the manufacturer.
How many batteries do I need?
It depends on your evening usage, how much backup you want, and your solar production. A single Powerwall 3 (13.5 kWh) covers most of an average evening for a mid-sized NorCal home and provides meaningful outage backup. Two units covers larger homes or multi-day backup. For Enphase, three 5P units (15 kWh) is a common starting point for similar coverage. We size it from your actual bill at the free consult, not from a standard package.
Can I add a battery to solar I already have?
Often yes. The right battery depends on your existing inverter. If you have Enphase microinverters, the IQ Battery 5P integrates cleanly. If you have a string inverter, the Powerwall 3 typically integrates well with its built-in inverter. We review your existing system before recommending anything. Call 916-461-9961 and describe what you have.
We'll tell you which battery
fits your home.
We look at your existing solar, your utility, your usage, and your panel. We recommend the right battery for your situation, not for our margin.