Path-Q Solar
What risk does frequent cycling create for a battery used mainly for daily bill savings?
Answer
Frequent cycling consumes the battery's usable life and can reduce capacity over time, although the effect depends on depth of discharge, temperature, charge rate, chemistry, and the manufacturer's warranty limits. Daily savings should be evaluated against degradation and any warranted energy-throughput or cycle limit.
Key points
- Distinguish a cycle from a partial cycle and ask how the manufacturer measures both.
- Review warranted retained capacity, cycles or throughput, operating temperature, and end-of-warranty conditions.
- Confirm whether savings controls can preserve an outage reserve and limit damaging operating conditions.
What it depends on
- Daily depth of discharge and number of equivalent full cycles
- Battery chemistry, thermal management, and operating environment
- Warranty throughput, cycle, capacity, and calendar-life terms
Risks and trade-offs
- More cycling can increase bill savings while shortening the period of useful capacity.
- A warranty may limit operation or exclude capacity loss caused by specified conditions.
- Projected savings may overstate results if degradation is not modeled.
Information you may need
- Expected annual throughput and dispatch schedule
- The complete battery warranty
- A savings forecast with degradation included
Your next step
What to do next
Ask the installer to provide a year-by-year savings and capacity model matched to the warranty's cycle or throughput limits.
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SQ02760