title: "How we rank batteries & inverters for WA" description: "Weighted scoring, update cadence and what can move a score up or down." lastUpdated: "27 Feb 2026"

How we rank

Weights (example): Safety 25%, Warranty 20%, Support 15%, VPP readiness 15%, Backup capability 15%, Real-world fit 10%.

Update cadence: quarterly; ad-hoc for recalls, list changes or major firmware updates.

What moves scores

Up: clearer AU warranty, improved VPP integration, better documentation
Down: de-listing from approved lists, recurring field faults, parts shortages

Weights (example): Safety 25%, Warranty 20%, Support 15%, VPP readiness 15%, Backup capability 15%, Real-world fit 10%.

Update cadence: quarterly; ad-hoc for recalls, list changes or major firmware updates.

What moves scores

Up: clearer AU warranty, improved VPP integration, better documentation
Down: de-listing from approved lists, recurring field faults, parts shortages