Path-Q Solar
What information is needed to decide whether a battery should be installed with solar?
Answer
You need to understand when electricity is consumed, how often outages occur, what backup loads matter, how solar exports are valued, and the battery's installed cost, usable capacity, power, efficiency, warranty, and expected operating life. The decision should compare those benefits with the battery's cost and replacement risk.
Key points
- Battery value may come from backup, shifting solar use, reducing peak purchases, or other services; identify the objective first.
- A battery's energy capacity and power capacity are different and both matter.
- Historical interval usage and outage experience are more useful than annual consumption alone.
What it depends on
- Load timing and critical-load requirements
- Outage frequency, duration, and backup expectations
- Solar production and export terms
- Battery cost, warranty, degradation, and usable capacity
- Financing, incentives, and applicable installation requirements
Risks and trade-offs
- A battery may improve resilience without producing the best financial return.
- Oversizing can leave capacity unused, while undersizing may not support desired loads.
- Future replacement, maintenance, degradation, and compatibility risks should be included.
Information you may need
- Interval electricity use and representative bills
- Outage history and list of critical circuits
- Solar production and export arrangements
- Battery specifications, installed quote, warranty, and current incentives or rules
Your next step
What to do next
Define the primary objective and request a battery analysis showing usable capacity, backup duration, annual cycling, costs, savings, and sensitivity to current local terms.
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