Tesla Powerwall vs BYD vs Sonnen: Specs and Warranty

Last updated: November 2026.

These three home batteries are built differently. Tesla sells a battery with the inverter inside, BYD sells a battery that needs your inverter, and sonnen sells an indoor AC-coupled unit. Pick by the job, not by a winner. Each point below comes from a datasheet or warranty document linked on this page.

• Whole-home backup from one unit: Powerwall 3 lists up to 11.5 kW continuous. A sonnenCore+ gives 4.8 kVA, and three stacked give 14.4 kVA. A BYD HVS battery is limited by the hybrid inverter you pair it with.
• Existing inverter or three-phase supply: BYD publishes a list of compatible hybrid inverters. Powerwall 3 and sonnenCore+ include their own inverters, and sonnenCore+ is AC coupled to the solar inverter you already have (its sheet lists a 6 kVA maximum recommended PV per system).
• Outdoor wall or garage mounting: Powerwall 3 is rated IP67 for the battery and power electronics, BYD HVS IP55 and sonnenCore+ IP30, which is an indoor rating.

The table below puts the three datasheets side by side. It uses only figures the makers publish, and it flags where the makers measure the same thing in different ways.

Spec Comparison at a Glance

Sources: Tesla Powerwall 3 datasheet (US, 2025), Tesla Powerwall emergency response guide (rev. 1.6), BYD Battery-Box Premium HVS datasheet (BCU2.0, March 2025) on BYD’s downloads page and the sonnenCore+ technical specifications on sonnen USA’s product page.

Read the table with three cautions.

1. Energy is not measured the same way. Tesla’s 13.5 kWh is a nominal AC figure. BYD’s 10.24 kWh is DC usable energy tested at 100% depth of discharge, and BYD notes that system usable energy varies with the inverter brand. Compare them only after you confirm what each installer quotes.
2. Efficiency is not measured the same way. Tesla publishes two solar-based figures, not a round-trip number. BYD and sonnen publish round-trip figures. Sonnen’s is calculated with the formula used by California’s SGIP program.
3. Regional versions differ. The Tesla sheet is the US version for 120/240 V split-phase service, and Tesla publishes separate sheets for other countries. The sonnen sheet is from sonnen USA. The BYD warranty figures below are from the European document. BYD’s downloads page lists a separate US warranty for HVL and HVM models, not HVS.

For other battery pairings, see the best batteries hub.

Tesla Powerwall vs BYD

This is the most searched pairing, so here is the plain version.

Architecture. Tesla’s datasheet describes Powerwall 3 as a fully integrated solar and battery system. The inverter is inside, and it takes up to 20 kW of DC solar through six MPPTs. BYD sells the HVS as a battery only. You add a hybrid inverter from BYD’s compatible list. That gives installers a choice of inverter, and it adds a second product to specify and commission.

Power. Tesla lists 11.5 kW AC continuous and a load start rating of 185 LRA, which Tesla says means a single unit can support the needs of most homes. BYD does not list an output in kW for the battery. It lists a maximum output current of 25 A and a peak of 50 A for 3 seconds. On the HVS 10.2 that is 25 A × 409.6 V nominal = 10.24 kW at the battery. The inverter you choose caps the real figure.

Warranty. Both are 10 years. Tesla’s US terms give 70% energy retention at 10 years with unlimited cycles for solar self-consumption, time-based control and backup. BYD’s European terms give 60% of usable energy at 10 years, or a minimum throughput, whichever comes first. See the warranty section for the arithmetic.

Efficiency. BYD publishes at least 96% round trip. Tesla publishes 89% for solar to battery to home and 97.5% for solar to home, which answer different questions. Read the round trip efficiency guide before you compare them.

Where each is sold. The BYD HVS datasheet lists service partners in Europe, Australia and the USA. BYD’s US warranty on its downloads page names the HVL and HVM models. Check with a local installer that the exact model you want is sold and supported in your market.

Inverter compatibility. BYD’s HVS and HVM compatible inverter list (version 2.22) includes Fronius, GoodWe, SMA, Kostal, Sungrow, Solis and Deye, among others. We did not find SolarEdge or Victron on that list, so check it before you quote a pairing. Source: BYD downloads page.

Sonnen vs Tesla

Power. A sonnenCore+ 10 is rated 4.8 kVA grid-tied. Stacked, the sheet lists 9.6 kVA for two systems and 14.4 kVA for three. A single Powerwall 3 is rated up to 11.5 kW. Three stacked sonnenCore+ systems give 14.4 kVA, and that is also 3 × 4.8.

Placement. The sonnen sheet lists IP30 and describes the system as indoor-rated, with natural convection cooling and noise below 25 dB. Tesla lists IP67 for the battery and power electronics and NEMA 3R for the enclosure, and noise below 50 dB(A) typical at 1 m.

Efficiency. Sonnen lists 85.4% peak round trip. Tesla does not publish a round-trip number. See the cautions under the spec table.

Warranty. Both give 70% capacity at 10 years. Sonnen caps the term at 10,000 cycles, and its warranty page lists 85 MWh of total energy for a 10 kWh system. Tesla’s terms for solar self-consumption, time-based control and backup have no cycle limit. Sonnen’s USA warranty page lists 70% for sonnenCore+.

Chemistry. Sonnen lists LFP. Tesla does not say which chemistry Powerwall 3 uses in its datasheet.

Extra programs. Sonnen’s US site says California customers can enroll a battery in its sonnenConnect program, with benefits of up to USD 2,100 per year, depending on system size and enrollment approval. That is sonnen’s own claim, and it applies to one program in one state.

Tesla Powerwall 3: What the Datasheet Says

• Energy: 13.5 kWh nominal.
• Power: 11.5 kW AC continuous, with 5.8, 7.6 and 10 kW settings. Off-grid, with PV only, the configurable maximum continuous discharge is 15.4 kW if the on-grid rating is 11.5 kW and the unit is installed with an 80 A breaker.
• Solar input: up to 20 kW DC across 6 MPPTs.
• Weight and size: 132 kg installed, 1105 × 609 × 193 mm.
• Environment: -20 °C to 50 °C. Performance may be de-rated above 40 °C.
• Noise: below 50 dB(A) typical at 1 m.
• Connectivity: Wi-Fi, Ethernet and cellular, managed in the Tesla app.
• Warranty: 10 years. Tesla may not be able to honor the full 10 years if the unit stays offline for an extended period, but Tesla says it will honor at least four years.

The datasheet does not list a switchover time, a peak power rating or a price. Tesla’s own pages for price are closed to automated access, so we do not quote one.

BYD Battery-Box Premium HVS: What the Datasheet Says

• Modules: 2.56 kWh, 102.4 V and 38 kg each, 2 to 5 modules per tower.
• Usable energy: 5.12, 7.68, 10.24 or 12.8 kWh per tower, up to 38.4 kWh.
• Voltage: 204.8 to 512 V nominal, depending on module count.
• Current: 25 A maximum output and 50 A for 3 seconds. Output is derated between -10 °C and +5 °C.
• Efficiency: round trip 96% or more.
• Weight: 91 kg for the HVS 5.1 and 167 kg for the HVS 10.2.
• Environment: -10 °C to +50 °C, IP55, indoor or outdoor, floor stand.
• Applications: on-grid, on-grid with backup and off-grid.

BYD’s own marketing lines, which we report as claims, are that the cells are developed in-house, that its LFP experience goes back to 2002, and that it has shipped more than a million systems in over 100 countries.

sonnenCore+: What the Spec Sheet Says

• Models: SCORE-P10 (10 kWh) and SCORE-P20 (20 kWh), built from 5 kWh usable modules.
• Power: 4.8 kVA per system, 9.6 kVA for two and 14.4 kVA for three.
• Efficiency: 94.4% peak inverter efficiency and 85.4% peak round trip.
• Weight: about 160 kg for the P10 and 238 kg for the P20.
• Environment: 0 °C to 45 °C, natural convection cooling, noise below 25 dB.
• Ratings and listings: IP30, UL 1741, UL 1973, UL 9540, UN 38.3 and UL 9540A.
• Stacking: up to 3 systems per home, all 10 kWh or all 20 kWh, not mixed.
• Warranty: 10 years or 10,000 cycles, whichever comes first.

An earlier version of the spec sheet, still on sonnen’s media server, listed 85.8% round trip and a Type 12 enclosure rated as not acceptable for outdoor use. We use the current sheet and note the difference.

Chemistry: What Each Maker Publishes

BYD and sonnen both list lithium iron phosphate on their sheets. Tesla’s Powerwall 3 datasheet lists no chemistry. Tesla’s emergency response guide says the cells in its Powerwall products can use NCA, NMC, LFP, NMO or lithium cobalt oxide electrodes, or a mixture, and does not say which applies to Powerwall 3. Treat Powerwall 3’s chemistry as unconfirmed by Tesla’s documents and ask for it in writing before you rely on it.

For more on the trade-offs, see the LFP vs NMC battery guide.

Power Output: Why Continuous Power Matters More Than Capacity

Capacity tells you how long a battery can run. Continuous power tells you what it can run at the same time. During an outage the battery has to carry every load you keep on, and motor loads draw extra current when they start. Tesla lists a load-start capability of 185 LRA for Powerwall 3.

Work from your own loads:

1. List the loads you want to keep on during an outage, with the running power from each nameplate.
2. Add the running power of everything that could be on at once.
3. Check the largest motor start current against the battery’s surge rating.
4. Compare the total with the continuous rating: 11.5 kW for one Powerwall 3, 4.8 kVA for one sonnenCore+, or the rating of the hybrid inverter you pair with a BYD HVS.

If the total is above 4.8 kVA, a sonnenCore+ project needs two or three stacked systems, which raises cost. The battery size calculator and the residential battery sizing guide walk through the sizing steps.

Warranty and Which Battery Lasts Longest

A warranty is a floor, not a forecast. None of the three makers publishes a lifespan. Here is what each one guarantees.

Sources: Tesla Powerwall limited warranty (USA), BYD Battery-Box Premium HVS and HVM limited warranty, Europe, on BYD’s downloads page and the sonnen USA warranty page.

Three points matter when you compare them.

BYD’s throughput limit can end the term early. The HVS 10.2 has 10.24 kWh usable. Its minimum throughput is 30.82 MWh. 30,820 kWh ÷ 10.24 kWh = about 3,010 full discharges. At one full discharge a day, that is about 8.2 years (3,010 ÷ 365). A battery that cycles less than once a day takes longer to reach it.

Sonnen’s cycle limit is not the binding limit at one cycle a day. 10,000 cycles at one a day is about 27 years, so the 10-year term ends first. The 85 MWh figure checks out: 10 kWh × 10,000 cycles × 85% average capacity, since capacity falls in a straight line from 100% to 70%, gives 85,000 kWh. Sonnen’s product page cites an estimated lifetime throughput of up to 181 MWh for a 20 kWh system, while the warranty table lists 170 MWh, so treat the product page figure as marketing and the warranty table as the term.

Tesla’s cap only applies to other uses. For a home that cycles daily for self-consumption, time-based control or backup, Tesla’s terms have no cycle limit. If you use the battery in another way, the cap is 37.8 MWh, which is 2,800 full cycles of 13.5 kWh (37,800 ÷ 13.5).

On paper, Tesla and sonnen guarantee the same 70% at 10 years, and BYD guarantees 60%. Which battery lasts longest in a real home depends on temperature, cycling and installation. No source we found gives independent field data for all three, so this page does not publish degradation estimates. A 10-year cost-of-ownership chart would need installed prices and measured degradation, so it is not included.

Pricing: What Is Published

None of the three datasheets lists an installed price. BYD and sonnen sell through installers and distributors. Tesla’s own price page was closed to automated access when we checked, so we do not quote a Powerwall 3 price.

To compare cost per usable kWh, take each written installer quote and divide it by the usable energy in the datasheet: quote ÷ kWh. Keep the energy basis in mind, as 13.5 kWh nominal AC is not 10.24 kWh usable DC. Include the inverter in the BYD quote, because Powerwall 3 and sonnenCore+ include theirs.

In the USA, the federal residential clean energy credit does not apply to battery systems placed in service after 31 December 2025, according to the IRS. Check state and utility programs separately. Model payback with a solar financial analysis tool that takes your tariff and outage data.

Installation and Site Constraints

Placement follows the ratings in the table. Powerwall 3 is floor or wall mounted and rated for indoor and outdoor use. BYD HVS is a floor stand rated IP55 for indoor or outdoor use. sonnenCore+ is a floor-standing indoor system with an IP30 rating. For BYD, confirm the pairing on the compatible inverter list, and for any of the three follow the installation manual and the local electrical code.

To put a battery into a customer proposal, book a SurgePV demo and bring a real project.

Action Items for Buyers and Installers

• Define the peak load first. Find the highest load you will run at once, then check it against each continuous rating.
• Match the battery to the inverter question. If the home has a compatible hybrid inverter, check BYD’s list. If it does not, compare the integrated options.
• Compare quotes on the same basis. Ask for usable kWh, continuous kW, warranty terms and what the price includes.
• Read the warranty for your market. The Tesla, BYD and sonnen terms above are the US or European versions. Others differ.

Frequently Asked Questions

Which is better, Tesla Powerwall vs BYD vs Sonnen?

None is better for every home. Powerwall 3 lists the highest continuous power (11.5 kW) and an integrated inverter. BYD HVS is modular and works with a list of third-party hybrid inverters. sonnenCore+ is a 4.8 kVA indoor battery that stacks up to 14.4 kVA. Tesla and sonnen warrant 70% at 10 years and BYD 60%. Choose by your load, inverter and placement.

Do Tesla Powerwall, BYD and Sonnen use the same battery chemistry?

The BYD HVS and sonnenCore+ datasheets list lithium iron phosphate (LFP). Tesla’s Powerwall 3 datasheet does not list a cell chemistry, and Tesla’s emergency response guide names several possible cell materials for the Powerwall family, including LFP and NMC, without saying which one Powerwall 3 uses. Ask the installer for the chemistry in writing.

How much does Tesla Powerwall 3 cost compared to BYD and Sonnen in 2026?

None of the datasheets publishes an installed price, so we do not quote one. Get written quotes and divide each by the usable kWh in the datasheet. Include the hybrid inverter in a BYD quote.

Can Tesla Powerwall, BYD, and Sonnen do whole-home backup?

It depends on your loads. Powerwall 3 lists 11.5 kW continuous and a 185 LRA load start. A sonnenCore+ gives 4.8 kVA per system, and three stacked give 14.4 kVA. A BYD HVS battery is limited by the hybrid inverter you pair with it. Add up the loads you want on at once and compare.

Which battery has the best warranty in 2026?

On paper, Tesla and sonnen both guarantee 70% capacity at 10 years, and BYD guarantees 60%. Tesla has no cycle limit for solar self-consumption, time-based control and backup. Sonnen ends at 10,000 cycles. BYD’s term also ends at a minimum throughput, 30.82 MWh for the HVS 10.2. Terms differ by country.

Is BYD better than Tesla Powerwall?

It depends on what you need. BYD publishes a higher round-trip efficiency figure (96% or more against Tesla’s 89% and 97.5% solar-based numbers, which measure different things) and lets you choose the inverter. Tesla has an integrated inverter, a listed continuous power of 11.5 kW (BYD lists none for the battery alone) and a stronger warranty floor (70% against 60%). Check which models are sold and supported in your market.

Can I add more storage to my Tesla Powerwall, BYD, or Sonnen system later?

Yes, within limits. Tesla’s datasheet allows up to 4 Powerwall 3 units and up to 3 expansion units, 7 units in total. BYD HVS towers take 2 to 5 modules and the datasheet lists a 38.4 kWh maximum. Sonnen stacks up to 3 systems for 60 kWh, all the same size. Check with the installer before you buy.