Score Methodology
ChargeRank Score (charger_v1) is a composite index built from 8 independent signals. The formula, weights, and data sources are fully transparent.
How It Works
The charger_v1 algorithm follows a four-phase pipeline: signal collection from verified public sources, normalization using the Skip-and-Normalize strategy (missing data is excluded, never zero-filled), category-specific weighting with regional tuning factors, and a final composite score on a 0-100 scale.
Collect
Gather specs, deployment data, and pricing from public sources
Normalize
Skip missing fields. Normalize across categories with regional tuning
Weight
Apply multi-dimension weight matrix. More data = higher confidence
Score
Compute composite 0-100 score. Publish. Nightly recompute.
Signal Dimensions & Weights
Each dimension is scored independently, then combined with category-specific weights. Weights vary slightly between AC wallbox and DC fast charger categories.
Skip-and-Normalize
When a data field is missing for a charger, charger_v1 skips that field entirely rather than filling it with a zero or average value. This ensures that chargers with incomplete public profiles are not penalized for lacking data — they are simply scored on the data they do have.
Traditional Approach (Not Used)
Missing efficiency data → Fill with 0% → Score drops significantly → Product unfairly penalized
Skip-and-Normalize (Our Method)
Missing efficiency data → Skip dimension → Other dimensions re-normalized → Score remains fair
Regional Tuning
Because EV charging standards vary dramatically by region, charger_v1 applies regional weight factors to ensure fair cross-market comparison.
North America
NACS-first
NACS connectors receive full weight. CCS1 legacy support is bonus.
Europe
CCS2-mandated
CCS2 and Type 2 are baseline. Multi-standard support is bonus.
Asia-Pacific
GB/T-dominant
GB/T is primary standard. CHAdeMO legacy support tracked.
Global
Multi-standard
All connector types weighted equally. Universal compatibility rewarded.
Coverage Multiplier
Products with more verified data points receive a higher confidence multiplier (up to 1). Products with sparse data have their scores modestly reduced to prevent low-coverage listings from ranking too high.
Core Principles
Rankings Cannot Be Purchased
No subscription tier affects the ChargeRank Score. Verified, Pro, and Enterprise badges appear next to the score, but they never influence it.
Nightly Recomputation
Every charger is re-scored every night using the latest available public data. Historical snapshots are preserved for transparency.
Full Methodology Published
The scoring formula, weight matrix, and normalization logic are fully documented and open to inspection.
Score Is Not Claim Status
Chargers are scored regardless of whether the manufacturer has claimed their profile. Paid relationships do not affect ranking.
Current Data Coverage
Questions or Corrections?
We welcome feedback on our methodology and data. If you spot an error or have a suggestion for improvement, we'd love to hear from you.