Warranty sheets are contracts—read the cycle assumptions
A 10,000-cycle headline means little without stated DoD, temperature, and C-rate. BESS financiers and owners should model throughput MWh against tariff savings.
Questions to ask every ESS supplier
Request cycle test report excerpts, definition of end-of-life capacity, pro-rata replacement policy, and whether warranty transfers to secondary owners.
- Cycles at 80% vs 90% DoD
- Ambient derating above 35°C or below 0°C
- Annual throughput cap in warranty
- SOH reporting interface
- Excluded failure modes list

Compare Tuorde ESS warranty terms
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Model ROI with realistic degradation
Use 1–2% annual capacity fade sensitivity in 10-year models unless supplier provides tighter guaranteed band.