warrantycycle lifethroughputcapacity retentionmodel comparison

Home battery warranty comparison: all 17 models in one table

Every home battery warranty document we could obtain, read line by line: the term, the throughput cap, the capacity floor, and the conditions attached.

The Home Battery ReportAugust 19, 202610 min read✓ Verified

Our warranty guide explains what the terms mean: why a year count, a usage cap and a retention floor are three different promises, and which one binds for which kind of owner. This page does not repeat any of that. It is the table.

Every row starts from the manufacturer's datasheet, which is what our battery database records. Anything beyond that comes from the maker's own published warranty document, read August 19, 2026 and named in the last column. Where nothing is published, the cell says not published rather than carrying an estimate. We have not tested any of these products.

The table

| --- | --- | --- | --- | --- |

| Tesla Powerwall 3 | 10 years | Unlimited cycles for solar self-consumption, time-based control and backup; 37.8 MWh aggregate throughput for any other application | 70 percent of 13.5 kWh rated capacity at 10 years | Tesla Powerwall Limited Warranty (USA), Rev 2.6, effective May 6, 2026 |

| Enphase IQ Battery 10C | 15 years | 6,000 discharged cycles, whichever comes first | 70 percent at the end of year 10 and 60 percent at the end of the term | Enphase Limited Warranty, Storage Systems, effective August 20, 2025 |

| Panasonic EverVolt 2.0 | 12 years on system components, 5 years on accessories | Throughput equivalent to 6,000 cycles at 90 percent depth of discharge, whichever occurs first | At least 70 percent of rated capacity | EVERVOLT AllGuard Limited Warranty, updated November 1, 2023 |

| LG Home 8 | 5 years standard, extended to 10 years for systems registered with LG ThinQ and connected to the internet | Total operation limit of 59.8 MWh | At least 70.0 percent of usable capacity | Limited Warranty for LG Energy Storage System, valid from September 1, 2022 |

| Generac PWRcell | 10 years on battery modules, cabinet and inverter; 25 years on PVLink and SnapRS | 7.56 MWh of energy throughput per battery module, whichever comes first | At least 70 percent of nameplate rating at the end of the warranty period | Generac Power Systems Limited Warranty for Generac PWRcell, Revision G (04/2024) |

| SolarEdge Home Battery 400V | 10 years | Unlimited cycles for standard solar use; maximum 26 MWh throughput under third party management | 70 percent at the end of the warranty period | SolarEdge Limited SolarEdge Home Battery 400V Warranty, revised April 2023 |

| sonnen sonnenCore+ | 120 months from installation | 10,000 battery cycles, whichever comes first | Published as a table image on sonnen's warranty page, which we could not read as text, so we quote no percentage | sonnen Factory Limited Warranty, November 25, 2025 |

| Qcells Q.HOME CORE | 12 years on the battery, 10 to 12 years on inverter and hub, per the datasheet | 6,000 cycles at 90 percent depth of discharge, per the datasheet | Not published for this configuration | No warranty document published for this configuration; the current Qcells limited warranty covers Q.HOME CORE G3 and HUB G3 |

| Anker SOLIX X1 | 10 years on the power module, battery module, backup controller and current transformer; 5 years on the mobile dongle | 16.45 MWh throughput per X1-B5-H battery module | 60 percent end of life, stated as the condition attached to the throughput figure | Anker SOLIX X1 Home Energy Storage System Warranty Policy, US |

| EG4 PowerPro WallMount | 10 years, prorated one tenth per year after the first year | Over 8,000 cycles at 80 percent depth of discharge and 82.6 MWh rated lifetime production, per the spec sheet | Not published | EG4 warranty page for the 14.3 kWh WallMount All Weather battery, plus spec sheet ver. 1.0.1 |

| Savant Power Storage 20 | 10 years | 73 MWh or 3,650 cycles, per the spec sheet | An estimated 75 percent at 10 years, and estimated is Savant's word | Savant Power Storage 20 specification sheet (009-2477-00); no separate consumer warranty document published that we could find |

| Fortress eVault Max 18.5 | 10 years | First of 8,000 cycles at 80 percent DOD or 3,000 cycles at 100 percent DOD; throughput table of 87.2 MWh at 80 percent DOD, 48.9 MWh at 90 percent, 36.3 MWh at 100 percent | Not published | 10 Year Limited Warranty for eVault 18.5 kWh Max Battery, effective 02/01/2022 |

| BYD Battery-Box Premium HVS | 10 years per the datasheet, conditions apply | Not published for HVS | Not published for HVS | BYD's current US limited warranty, V1.3, covers HVL and HVM-US models installed on or after November 1, 2024 and does not list HVS |

What the warranty documents add that the datasheets do not

The gap between a spec sheet and a warranty letter is the most useful thing on this page, because buyers are shown the first and rarely handed the second.

Five retention floors appear only in the warranty document. FranklinWH's datasheet gives 15 years or 60 MWh; the warranty adds that capacity retention "will be not less than 70% of the rated capacity." Generac's spec guide gives 10 years or 7.56 MWh per module; the warranty adds "Capacity retention guarantee at the end of the warranty period: At least 70% of nameplate rating." SolarEdge's datasheet states a ten year term; the warranty adds 70 percent retention at the end of it. Enphase's IQ Battery 10C datasheet states 60 percent at up to 15 years; the newer warranty adds a 70 percent step at year ten. Anker's datasheet gives ten years limited; the warranty policy attaches 16.45 MWh at 60 percent end of life.

One throughput cap appears only in the warranty document. LG's spec page states the term and the 70 percent figure. The warranty adds "a total operation limit of 59.8 MWh," applying to both the five year standard period and the ten year extended one.

One maker publishes a throughput table rather than a number. Fortress Power's warranty prints total energy throughput by depth of discharge for the eVault Max 18.5: 87.2 MWh at 80 percent DOD, 48.9 MWh at 90 percent, 36.3 MWh at 100 percent. It is the only document here that makes the dependency explicit, and it needs one caveat. By our own arithmetic those figures do not reconcile with the cycle counts printed beside them: 8,000 cycles at 80 percent depth on an 18.43 kWh battery is considerably more energy than 87.2 MWh, and 3,000 cycles at 100 percent is more than 36.3 MWh. The two sets rest on different assumptions rather than one being wrong, and whichever limit arrives first governs. What depth of discharge does to the size of a cycle is in depth of discharge.

Two documents cover a different product than the one we track. BYD's US limited warranty V1.3 covers HVL 12.0 through 32.0 and HVM-US 8.3 through 22.1, with a per-model throughput table and a 70 percent retention figure at ten years. None of those models is the HVS system our datasheet describes. Qcells is in the same position: its published limited warranty covers Q.HOME CORE G3 and Q.HOME HUB G3, a different generation from the configuration on our page. In both cases the numbers exist, and they are not the numbers for the product in our table.

The conditions that quietly shorten a term

Almost every warranty in this set is conditional on something administrative, and three conditions recur.

Internet connection. Tesla states that if the Powerwall is offline for an extended period it may not be able to honor the full ten years, though it will always honor at least four years from installation. FranklinWH sends a notification after 90 consecutive days offline and states that if connectivity is not restored, "the warranty period will automatically be reduced to a four-year limited warranty from the initial installation date." Generac's reduced floor is at least five years for the inverter, PWRmanager and battery cabinet, and at least five years or 3.78 MWh per battery module. SolarEdge is blunter: "If the SolarEdge Home Battery 400V is not connected to SolarEdge Monitoring Portal, SolarEdge will not be able to honor this Limited Warranty." Panasonic may void coverage if a lack of connectivity prevents it confirming the system was used within permitted temperature and voltage ranges. Qcells excludes faults arising from "Failure of the Product to maintain online connectivity continuously for at least 24 hours within any twenty five (25) calendar day period."

Registration. FranklinWH states that systems not registered at installation "will only be eligible for a four-year limited warranty from the installation date." LG's second five years exists only for systems registered with ThinQ and connected to the internet. Enphase conditions coverage on registration within 45 days, with a carve-out for California, Connecticut and any other state that forbids registration as a condition of coverage. EG4 requires registration within the first year. Generac's warranty begins on successful online registration.

Who is dispatching the battery. SolarEdge limits the warranty to a maximum energy throughput of 26 MWh "In the case of 3rd party management of SolarEdge Home Battery 400V," against unlimited cycles for standard solar use. Tesla's structure has the same shape: unlimited cycles for solar self-consumption, time-based control and backup, and a 37.8 MWh cap measured at the battery AC output for "any application not listed above, or any combination of applications that includes one not listed above." Whether a given utility program falls inside those lists is a question for the manufacturer in writing.

What a term length does not tell you

Two things the year count hides, both of which decide what a claim actually costs you.

Labor and travel. Generac covers parts, labor and limited travel on every PWRcell component, with travel capped at 100 miles and three hours round trip from the nearest authorized dealer. Tesla reimburses reasonable labor costs to a Tesla Certified Installer performing warranty work. Panasonic makes labor an optional coverage, available only where an Authorized Installer did the work and the system was registered within 90 days. Enphase excludes labor for un-installing and re-installing outright. Fortress states its warranty "does not cover the cost of installation, removal, shipping, or reinstallation."

How a claim is settled. Several makers reserve the right to pay a depreciated amount rather than replace the unit. Qcells publishes a schedule that falls from 100 percent residual value within the first two years to 5 percent between years ten and eleven and zero after year fourteen. EG4's replacement warranty is "prorated 1/10th per year after the first year at the current retail pricing." Enphase, FranklinWH and Anker all reserve a refund "less reasonable depreciation" as an alternative remedy. A ten year term settled on a depreciation schedule is a different product from a ten year term settled by replacement.

The counterparty

Every document in the last column is a promise from a company. SunPower's SunVault carried a ten year warranty and its OEM support was disrupted after the 2024 bankruptcy, which is the clearest reminder here that a term and a remedy are two different things. BYD reaches US homes largely through the solar installer channel, so for most homeowners the warranty relationship runs through the installer who specified the system. Ask who administers a claim before you buy, not at the point of failure.

For what these limits mean and which one is likely to bind for your own usage, read the warranty guide; for capacity over time, the degradation guide; and for what happens if you sell or move, taking a home battery when you move.

Every figure above comes from a manufacturer datasheet in our database or from a warranty document read August 19, 2026 and named in the table. The version that governs is the one in force for your unit, so confirm the current document before it moves a decision, and test the term against the payback in the calculator.

Frequently asked questions

Which home battery has the best warranty?

There is no single answer, because the terms are measured on different bases and bind under different usage. Of the models we track, FranklinWH and both Enphase batteries carry the longest term at 15 years. sonnen carries the highest cycle count at 10,000. Tesla and SolarEdge are the only two that state unlimited cycles for normal residential use, each with a separate capped bucket for other applications. Enphase is the only one that publishes a stepped floor, at 70 percent by year ten and 60 percent at the end of term. Pick the limit that matches how you will actually use the battery.

Do the warranty documents say more than the datasheets?

Considerably more, and that is the point of this page. Five makers publish a capacity retention floor in the warranty document that does not appear on the datasheet we cite: FranklinWH at 70 percent, Generac at 70 percent of nameplate, SolarEdge at 70 percent, Enphase adding a 70 percent step at year ten for the IQ Battery 10C, and Anker attaching a 60 percent end-of-life condition to its throughput figure. LG's warranty adds a 59.8 MWh total operation limit that its spec page does not state. Fortress publishes a full throughput table that varies with depth of discharge.

What can shorten a warranty that looks long on paper?

Internet connection and registration, most often. Tesla states it will honor at least four years if the unit is offline for an extended period. FranklinWH reduces coverage to a four year term if the system stays disconnected after a notification, and also if it was never registered at installation. Generac drops to at least five years for the inverter and cabinet and at least five years or 3.78 MWh per battery module. SolarEdge states it will not be able to honor the warranty if the battery is not connected to its monitoring portal. Qcells excludes faults where the product fails to maintain online connectivity for at least 24 hours in any 25 day period.

Does enrolling in a virtual power plant affect the warranty?

On two of the models we track it explicitly does. SolarEdge states that in the case of third party management of the battery, the warranty is limited to a maximum energy throughput of 26 MWh, against unlimited cycles for standard solar use. Tesla's warranty lists solar self-consumption, time-based control and backup as the applications carrying unlimited cycles, and applies a 37.8 MWh aggregate throughput cap to any application not listed, or any combination that includes one. Get a written answer from the manufacturer about your specific program before enrolling.

Is labor covered?

It varies more than the headline term does. Generac lists parts, labor and limited travel on every PWRcell component, with travel capped at 100 miles and three hours round trip. Tesla reimburses reasonable labor costs to a Tesla Certified Installer performing warranty work. Panasonic makes labor an optional additional coverage conditional on installation by an Authorized Installer and registration within 90 days. Enphase excludes labor for un-installing and re-installing. Fortress states its warranty does not cover the cost of installation, removal, shipping or reinstallation. Ask which of those applies before you assume a claim is free.

Why do two models have no warranty document here?

Because none is published for the configuration we track. BYD's current US limited warranty, version 1.3, covers the HVL and HVM-US models installed on or after November 1, 2024, and does not list the HVS system in our database. Qcells publishes a limited warranty for the newer Q.HOME CORE G3 and HUB G3, which is a different product from the Q.HOME CORE configuration our datasheet covers. In both cases we fall back to the datasheet figure and say so in the table rather than borrowing terms from a neighbouring product.

Does a strong warranty mean a strong battery?

It means a strong promise from a company, which is a different thing and only as good as the company. SunPower's SunVault carried a ten year warranty and OEM support was disrupted after the 2024 bankruptcy. Read the counterparty alongside the term.