Path-Q Solar
How can a battery support solar savings when export compensation is low?
Answer
A battery can store surplus solar that would otherwise be exported at a low value and discharge it later to offset higher-value electricity purchases. The benefit is the value of avoided purchases minus charging and discharging losses, battery degradation, and the battery's installed and financing costs.
Key points
- The battery is most useful when solar surplus overlaps with periods of higher electricity cost or low export compensation.
- Usable capacity and discharge power determine how much evening or overnight demand can be served.
- Low export compensation improves the potential value of self-consumption but does not guarantee a positive payback.
What it depends on
- Value of exported solar and cost of electricity purchases
- Hourly solar surplus and load profile
- Battery efficiency, capacity, power, and degradation cost
- Operating rules, rate structure, and any export or charging limits
Risks and trade-offs
- The battery may remain full if surplus solar exceeds evening demand, limiting additional value.
- Frequent cycling can reduce capacity and consume warranty throughput.
- A battery may not be economic if the gap between export value and avoided purchase cost is small or short-lived.
Information you may need
- Interval electricity use and solar-production data
- Export compensation and electricity-purchase values
- Battery quote, efficiency, usable capacity, and warranty
- Expected control strategy
Your next step
What to do next
Calculate the annual value of solar energy that could be shifted from low-value export to avoided purchases, then subtract efficiency, degradation, and ownership costs.
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