Path-Q Solar
How does using electricity mostly at night affect solar payback?
Answer
Using most electricity at night can lengthen solar payback when daytime solar is exported at a lower value than the retail electricity rate. The effect depends on export compensation, the size of the nighttime load, and whether a battery or load shifting can increase direct use.
Key points
- Self-consumed solar generally avoids a retail purchase, while exported solar may receive a different credit.
- A battery can move some daytime generation to nighttime use, but its cost, losses, capacity, and replacement risk must be included.
- Running flexible loads during solar-production hours can improve self-consumption without adding storage.
What it depends on
- Daytime versus nighttime consumption
- Retail rates and export-credit rules
- Battery cost, usable capacity, efficiency, and operating strategy
- System size and seasonal production
Risks and trade-offs
- Oversizing without sufficient daytime use can increase low-value exports.
- A battery may improve bill savings but still reduce overall financial return if its added cost is high.
- Nighttime usage patterns may change, making a fixed self-consumption estimate unreliable.
Information you may need
- Interval usage data or a day-versus-night consumption estimate
- Applicable tariff and export compensation
- Solar-only and battery-inclusive system proposals
Your next step
What to do next
Model direct use, exports, and battery shifting using your hourly load profile before choosing system size or storage.
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