Path-Q Solar
Would a business with high demand charges need a different solar design than one billed only for energy?
Answer
Yes. A business exposed to demand charges needs analysis of its highest interval power use and when solar can reduce that power, not just annual kWh consumption. Solar may reduce some daytime peaks, while battery storage, load control, or operational changes may be needed for peaks occurring when solar output is low.
Key points
- Review the tariff's demand-measurement interval, seasonal rules, ratchets, and other billing components using current local documents.
- Identify the timing and duration of historical demand peaks.
- Model solar output against those intervals rather than comparing only annual energy.
- Evaluate storage and load management separately from additional panel capacity.
What it depends on
- Current utility tariff and demand-charge definitions
- Interval meter data
- Timing, duration, and causes of peak loads
- Solar production profile
- Battery and load-control capabilities
Risks and trade-offs
- A large array may produce substantial annual energy while doing little to reduce demand charges.
- Storage can improve peak reduction but adds cost, losses, controls, and replacement considerations.
- Tariff changes or billing rules can change the preferred design and require current verification.
Information you may need
- Current bills and tariff documents
- Interval demand data
- Equipment and operating schedules
- Solar design and production profile
- Potential battery and load-management options
Your next step
What to do next
Obtain the current tariff and interval data, then compare solar-only, solar-plus-storage, and load-management designs against both energy and demand charges.
Path-Q
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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