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PLACEHOLDERNot a representation of the product
Performance & Value · financial note below

VARTA.wall BM2

9–18 kWh · LFP · DC-coupled

VARTA

53/ 100

Average / Industry average

Global

LFP5 kWh Modular

The verdict. In our Performance & Value class, VARTA VARTA.wall BM2 leads on safety & chemistry. See the financial standing note above. A long warranty is only as good as the business behind it.

71thof 74 in Performance & ValueBottom quarterclass average 63.0
Compare this battery →Ask Watt →
Worth knowing. This maker's recent financial or corporate status is worth checking before relying on a long warranty. One reporting period is not a trend, and a figure like this can sit alongside investment the same company has disclosed. Read the source, then ask your retailer what warranty backing applies.

The assessment

How it scores, by category

Capacity & Usability61
Power & Efficiency65
Longevity (verified)48
Safety & Chemistry66
Guarantee & Backbone34
Energy Ecosystem40

Market position

71thof 74 in Performance & ValueBottom quarter
485376

Our reading

VARTA.wall BM2 scores 53, placing 71 of 74 in the Performance & Value class against a class average of 63.0. Its strongest scoring dimension is safety & chemistry (66). Guarantee & Backbone scores 34, the lowest pillar for this product. The class average on guarantee & backbone is 54. Key specifications: LFP, 9.3 kW continuous output.

The data

Chemistry
LFP
Power
9.3kW
Round-trip
Not recorded
Cycle life
Not recorded
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
9–18 kWh
Phase
Not recorded
Backup boundary
Installation-specific
Architecture describes the product boundary. It is not a system design or an equipment-pairing decision.
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 VARTA.wall BM2 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. The score uses the named exact German benchmark; larger stacks, paid states and nearby generations do not transfer evidence. Scored model: VARTA.wall 18 BM2 · checked 2026-08-16. Evidence.

Sources & references · checked 2026-09-01

Strong evidence coverage

12 of 12 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. VARTA.wall BM2 German datasheet and March 2026 operating manual checked 2026-08-16. First-market US overlay review 2026-09-01: official United States catalogues recorded; existing Australian and German overlays and scores unchanged.

Change ledger

Product record history

5 changes to this record · 152 products changed in this update
  1. Record updated

    Source revision

    Before
    VARTA.wall BM2 German datasheet and March 2026 operating manual checked 2026-08-16
    After
    VARTA.wall BM2 German datasheet and March 2026 operating manual checked 2026-08-16. First-market US overlay review 2026-09-01: official United States catalogues recorded; existing Australian and German overlays and scores unchanged.
    Primary datasheet
  2. Evidence added

    US Status

    Before
    Not previously recorded
    After
    not_reviewed
    US market evidenceCell provenance & traceability
  3. Evidence added

    US Certifications

    Before
    Not previously recorded
    After
    US market evidenceCell provenance & traceability
  4. Evidence added

    US Evidence sources

    Before
    Not previously recorded
    After
    https://www.varta-ag.com/de/konsument/produktkategorien/energiespeicher/vartawall; https://www.varta-ag.com/us/
    US market evidenceCell provenance & traceability
  5. Evidence added

    US Support Note

    Before
    Not previously recorded
    After
    varta-ag.com/us is a CAPTCHA and does not retrieve VARTA.wall BM2. BM1 is a different chemistry and is not transferred. Held is not unavailable.
    US market evidenceCell provenance & traceability
1 change to this record · 9 products changed in this update
  1. Evidence added

    DE Grid and installation context

    Before
    Not previously recorded
    After
    The BM2 battery's IEC 62619 and VDE-AR-E 2510-50 evidence is battery-safety evidence, not standalone German grid approval. Final grid conformity belongs to the site's power-conversion equipment, settings and network approval; no cross-product suitability is inferred.
    Warranty throughputFinancial strength & warranty backing+3 in JSON record
8 changes to this record · 78 products changed in this update
  1. Evidence added

    Value

    Before
    Not previously recorded
    After
    Reviewed 2026-08-25: no exact-product battery/DC round-trip efficiency with a complete measurement boundary was established in the reviewed primary source set. This is a scoped reviewed absence, not proof that the value has never been measured.
    Primary datasheet
  2. Evidence added

    State

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

    State

    Before
    Not previously recorded
    After
    reviewed_absence
    Primary datasheet
  4. Evidence added

    Confidence

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

    Evidence sources

    Before
    Not previously recorded
    After
    https://www.varta-ag.com/fileadmin/varta/consumer/downloads/energy-storage/varta.wall/Datenblatt_wall_BM2_DE.pdf
    Primary datasheet
  6. Evidence added

    Evidence sources

    Before
    Not previously recorded
    After
    https://www.varta-ag.com/fileadmin/varta/consumer/downloads/energy-storage/varta.wall/Datenblatt_wall_BM2_DE.pdf
    Primary datasheet
  7. Evidence added

    Confidence

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

    Value

    Before
    Not previously recorded
    After
    Reviewed 2026-08-25: no exact-product cycle-life result to exactly 70% retained capacity was established in the reviewed primary source set. Warranty limits and other or unstated endpoints are not converted. This is a scoped reviewed absence.
    Primary datasheet
1 change to this record · 13 products changed in this update
  1. Record added

    Product record

    kind: battery; brand: VARTA; name: VARTA.wall BM2; model: VARTA.wall 9 / 13.5 / 18 (BM2, LFP); scored reference VARTA.wall 18; score: 52.7

    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. DE market evidence checked
  4. Series benchmark evidence checked

Evidence record (JSON)

Scored by Solar Analytica Research

Further reading from Findings

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