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

VARTA.wall BM1

10–20 kWh · Chemistry not disclosed · DC-coupled

VARTA

49/ 100

Average / Industry average

Global

High Power 10kW+5 kWh Modular

The verdict. In our Performance & Value class, VARTA VARTA.wall BM1 leads on power & efficiency. See the financial standing note above. A long warranty is only as good as the business behind it.

62thof 63 in Performance & ValueBottom quarterclass average 63.4
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 & Efficiency63
Longevity (verified)48
Safety & Chemistry51
Guarantee & Backbone34
Energy Ecosystem40

Market position

62thof 63 in Performance & ValueBottom quarter
484976

Our reading

VARTA.wall BM1 scores 49, placing 62 of 63 in the Performance & Value class against a class average of 63.4. Its strongest scoring dimension is power & efficiency (63). Guarantee & Backbone scores 34, the lowest pillar for this product. The class average on guarantee & backbone is 55. Key specifications: 10.5 kW continuous output.

The data

Chemistry
Not
Power
10.5kW
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
10–20 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 BM1 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 20 BM1 · checked 2026-08-16. Evidence.

Sources & references · checked 2026-08-16

Strong evidence coverage

11 of 11 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 BM1 German datasheet and March 2026 operating manual checked 2026-08-16

Evidence timeline

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

  1. Core scorecard evidence checked
  2. DE market evidence checked
  3. Series benchmark evidence checked

Evidence record (JSON)

Scored by Solar Analytica Research

Further reading from Findings

Stay across the benchmark.

New scorecards, score changes and market signals, published as they happen.