The assessment
How it scores, by category
Market position
The data
Capacity guarantee: minimum retained at year 10
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
84 / 100#3 of 32 batteriesWhole-home, seamless (<20ms)
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.
Two things to check
Ask the installer: What usable capacity, backup power and warranted operating conditions will the installed ESA G20 configuration deliver?
Verification & sources
Market context
Global benchmark. This scorecard is benchmarked globally. A global score does not imply local availability, certification, warranty coverage, or installer compatibility.
Benchmark anchor. Capacity range describes supported configurations; the score remains anchored to the named reviewed reference configuration, not the largest stack. Scored model: GW8K-EHA-G20 with GW8.3-BAT-D-G20 (8.0 kWh usable) · checked 2026-07-31. Evidence.
Sources & references · checked 2026-07-31
Strong evidence coverage
16 of 16 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.
- Sourced valuesData card →
- Warranty summary10-year product warranty →
Evidence timeline
Recorded verification events for this scorecard. These are evidence checks, not historical score snapshots.
- Core scorecard evidence checked
- Series benchmark source checked
- AU market evidence checked
- Plain-language warranty summary checked
Scored by Solar Analytica Research
Further reading from Signals
Stay across the benchmark.
New scorecards, score changes and market signals, published as they happen.
Our reading
ESA G20 scores 64, placing 16 of 24 in the Performance & Value class against a class average of 66.7. Its strongest scoring dimension is capacity & usability (100), running 12.0 points above the class average on this dimension. Guarantee & Backbone scores 43, the lowest pillar for this product. The class average on guarantee & backbone is 62. Key specifications: LFP, 8.0 kW continuous output.