How to use this calculator
- Enter project values using the units shown beside each field.
- Select Calculate to update the main estimate and supporting results.
- Review the interpretation and test realistic high and low assumptions.
#1014 · Energy & Environment Tool
Community Solar Storage Duration Calculator
Estimate how long a community solar battery can support a specified power level after accounting for usable depth of discharge and round-trip delivery efficiency.
Calculator
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Formula
Storage duration (hours) = battery energy × depth of discharge × delivery efficiency ÷ discharge power
What the result means
The result estimates continuous discharge time at the selected power level before the usable stored energy is exhausted.
Real batteries may face power limits, reserve requirements, temperature effects, auxiliary loads, degradation, and a non-flat discharge profile.
Example calculation
A 2,000 kWh battery at 90% usable depth and 92% efficiency delivers 1,656 kWh. At 500 kW, duration is about 3.31 hours.
Tips for better results
Use the contracted or inverter-limited discharge power, and reduce nameplate energy to reflect current battery health if the system has aged.
Keep units and AC/DC or gross/net definitions consistent across every input.
Frequently asked questions
What does this community solar storage duration estimate show?
The result estimates continuous discharge time at the selected power level before the usable stored energy is exhausted.
Can I use this result for a final investment or engineering decision?
No. Use it as a screening estimate and confirm project-specific assumptions with qualified engineering, financial, utility, and tax professionals.
Why might actual results differ?
Weather, equipment performance, outages, degradation, curtailment, tariffs, operating strategy, and data-basis differences can all change actual outcomes.
Should I use AC or DC solar capacity?
Use the capacity basis specified by the input label and keep every production or performance value on the same basis.
How often should I update the estimate?
Update it whenever design ratings, resource studies, operating data, tariffs, incentives, battery condition, or project costs change.
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Quick reference
| Item | Guidance |
|---|---|
| Best use | Early-stage screening and scenario comparison |
| Update when | Design, resource, cost, tariff, or operating assumptions change |
| Decision quality | Confirm with project-specific engineering and financial analysis |