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PLACEHOLDERNot a representation of the product
Performance & Value · legacy record

EVERVOLT Gen 3 18

18 kWh · LFP · DC-coupled

Panasonic

69/ 100

Very good

Global

The verdict. Historical assessment, retained under its original rubric. Not ranked against current products.

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Legacy record. Panasonic Corporation of North America states that it discontinued its solar and battery storage business line. EVERVOLT Gen 3 remains an installed-base record with continuing product support and applicable warranty coverage. Source. Scored 69 under battery v2.9.0 and frozen as of 2026-08-06: this product is no longer in active assessment or live comparison, and its score is not maintained against the current rubric. Its pillar scores and audit sheet are preserved from the original assessment, including original estimates and gaps. Current safety and support notices are shown separately. Consult current warranty documents for claim decisions.

The assessment

Historical assessment, by category

Capacity & Usability79
Power & Efficiency74
Longevity (verified)71
Safety & Chemistry61
Guarantee & Backbone92
Energy Ecosystem42

The data

Chemistry
LFP
Power
7.6kW
Round-trip
94%
Cycle life
6,000cycles
Technology architecture

DC-coupled battery

Architecture guide

Stores DC energy and relies on system power electronics outside the battery product for household AC.

Product role
The published battery record covers the storage stack, controller and stated capacity range.
Published range
18 kWh
Phase
Not recorded
Backup boundary
Installation-specific
Architecture describes the product boundary. It is not a system design or an equipment-pairing decision.

Usable capacity

90% of this battery’s nominal capacity is usable, 18 kWh in the scored configuration.

18 kWh usableScored configuration: EVHB-I7-X20.

The remaining 10% stays in the pack as reserve; the home never draws it.

Nominal capacity is not stated here. The usable kWh and the depth-of-discharge percentage are sourced separately, at times from different documents and different module counts, so dividing one by the other would produce a nominal figure no manufacturer published.

Usable capacity sourceDepth-of-discharge source

Capacity guarantee: minimum retained at year 12

18.0 kWhfull12.6at yr 12
60708090100Rated capacity 100%Guaranteed floor 70.0%Typical 10yr70.0%0yr5yr10yr12yr
Rated capacity (reference)Guaranteed floor: 70.0% at yr 12Typical battery warranty term: 10 yr

No year-by-year capacity schedule is published for this product - the manufacturer guarantees only this end-of-term minimum, not a specific decline curve. Capacity figure based on the sourced usable capacity of the base configuration; modular systems scale with additional modules.

Blackout protection

No backupGrid-forming

Whole-home (via hybrid inverter)

Continuous power
7.6kW
Switchover
>100ms / undisclosed
Surge / motor-start
Surge rated

The blackout score is a standalone benchmark of outage resilience only - it re-weights sourced specs already scored in this product’s pillars (backup tier, switchover, surge strength, backup power, off-grid recharge) and never affects the overall score. Dots show the full battery fleet; the marker is this product.

Before you buy
Local positionUse a market view to check local availability, approvals and warranty scope.
Ask the installerWhat usable capacity, backup power and warranted operating conditions will the installed EVERVOLT Gen 3 18 configuration deliver?

Verification & sources

Market context

Global evidencechange in the site menu

Global benchmark. This scorecard is benchmarked globally. A global score does not imply local availability, certification, warranty coverage, or installer compatibility.

Benchmark anchor. Supported installed-base record only. Panasonic states that it no longer sells batteries in the United States. Scored model: EVHB-I7-X20 · checked 2026-08-02. Evidence.

Sources & references · checked 2026-08-07

Strong evidence coverage

28 of 28 scored criteria link directly to a published source.

Values marked estimated, derived, or not found remain visible on the audit sheet and do not carry the same evidential weight as a linked source. Coverage measures direct links, not an independent guarantee that a claim is correct.

Record revision. Exact EVHB-I7-X20 sheet, November 2023 governing warranty, installed-base support, completed SolaX Cloud transition and buyer-consequence boundaries reviewed 2026-08-07

Change ledger

Product record history

12 changes to this record · 78 products changed in this update
  1. Evidence added

    Value

    Before
    Not previously recorded
    After
    The exact datasheet separately publishes 90% AC-coupled round-trip efficiency; the scored 94% value is its DC-coupled pathway.
    Primary datasheet
  2. Evidence added

    State

    Before
    Not previously recorded
    After
    supported
    Primary datasheet
  3. Evidence added

    Evidence sources

    Before
    Not previously recorded
    After
    https://ftp.panasonic.com/solar/brochure/home_battery_sheet.pdf
    Primary datasheet
  4. Evidence added

    Confidence

    Before
    Not previously recorded
    After
    high
    Primary datasheet
  5. Evidence added

    Confidence

    Before
    Not previously recorded
    After
    high
    Primary datasheet
  6. Evidence added

    Confidence

    Before
    Not previously recorded
    After
    high
    Primary datasheet
  7. Evidence added

    State

    Before
    Not previously recorded
    After
    supported
    Primary datasheet
  8. Evidence added

    Evidence sources

    Before
    Not previously recorded
    After
    https://ftp.panasonic.com/solar/brochure/home_battery_sheet.pdf
    Primary datasheet
  9. Evidence added

    Value

    Before
    Not previously recorded
    After
    The exact datasheet publishes 6,000 cycles at 90% depth of discharge and 70% remaining capacity.
    Primary datasheet
  10. Evidence added

    Evidence sources

    Before
    Not previously recorded
    After
    https://ftp.panasonic.com/solar/brochure/home_battery_sheet.pdf
    Primary datasheet
  11. Evidence added

    Value

    Before
    Not previously recorded
    After
    The exact system publishes 94% DC-coupled and 90% AC-coupled round-trip efficiency at 50% rated power and beginning of life. The native hybrid DC pathway is recorded.
    Primary datasheet
  12. Evidence added

    State

    Before
    Not previously recorded
    After
    supported
    Primary datasheet

This is review.solar's publication history. It does not claim the product changed on the recorded date, and it excludes compatibility, system pairing, installation suitability and relative leaderboard prose. Open the complete JSON record.

Evidence timeline

Recorded verification events for this scorecard. These are evidence checks, not historical score snapshots.

  1. Core scorecard evidence checked
  2. US market evidence checked
  3. Legacy product record archived
  4. Series benchmark evidence checked

Evidence record (JSON)

Scored by Solar Analytica Research

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