Path-Q Solar
How does battery cycling for bill savings affect its economic payback?
Answer
Routine cycling can improve payback by shifting energy from lower-value to higher-value periods, but each cycle contributes to degradation and efficiency losses. The benefit is worthwhile only when the value of the shifted energy exceeds the battery’s incremental degradation, losses, operating costs, and financing cost.
Key points
- Compare the value of discharged energy with charging losses and the value of battery life consumed.
- Use the actual rate structure, export treatment, control strategy, and load profile.
- Include usable capacity decline and any warranty throughput or cycle limits.
- Leave an outage reserve if resilience is also a goal.
What it depends on
- Time-varying prices and export compensation
- Round-trip efficiency and usable capacity
- Cycle frequency, depth of discharge, and degradation
- Financing, operating costs, and warranty limits
Risks and trade-offs
- Aggressive cycling can increase savings while shortening useful battery life.
- A control strategy optimized for bills may conflict with outage readiness.
- Projected savings can change if rates, export rules, or load patterns change.
Information you may need
- Detailed utility bill and rate schedule
- Battery efficiency, warranty, and degradation assumptions
- Expected dispatch schedule
- Load and solar production profiles
Your next step
What to do next
Ask for a year-by-year model showing savings, losses, cycling, degradation, reserve settings, and the economic value assigned to battery replacement.
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SQ00358