Path-Q Solar
Does battery cycling for bill savings shorten its useful life significantly?
Answer
Cycling contributes to degradation, but the effect depends on battery chemistry, depth of discharge, temperature, charge and discharge rates, and total throughput. Bill-saving operation may be reasonable when the resulting value exceeds the added wear and operating losses.
Key points
- A full equivalent cycle can be accumulated through several partial cycles.
- Deeper, hotter, or higher-power cycling generally places more stress on a battery than moderate operation.
- The relevant comparison is the value of avoided electricity cost against degradation, efficiency losses, and other operating costs.
- The warranty's cycle or throughput limit can indicate how the manufacturer expects the battery to be used.
What it depends on
- Battery chemistry and control strategy
- Depth and frequency of cycling
- Operating temperature and power level
- Electricity rates, export treatment, and battery warranty limits
Risks and trade-offs
- Using the battery for savings may reduce capacity available for outages or accelerate replacement.
- Savings can be overstated if round-trip losses and degradation are ignored.
- Frequent cycling may conflict with a warranty's operating limits.
Information you may need
- Expected annual cycles and depth of discharge
- Battery warranty throughput and capacity terms
- Avoided-cost and export-value assumptions
Your next step
What to do next
Request an operating model that shows annual bill savings, degradation assumptions, and remaining capacity under the proposed control strategy.
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