About the Backup / Resilience Value

Backup / Resilience Value calculates the economic worth of a solar-plus-storage system's ability to keep critical loads running during grid outages — quantifying avoided losses from power cuts in terms of production downtime, spoilage, critical equipment damage, and convenience premium.

How to calculate it

1. 1Identify critical loads and their value per hour of outage: a dairy farm losing cold chain = milk spoilage cost; a manufacturing line = lost production + restart cost; a household = convenience value + food spoilage.
2. 2Find local grid reliability statistics: outage frequency (events/year) and average duration (hours/event) from your DISCOM's annual report or personal bill history.
3. 3Calculate annual outage hours = frequency × average duration.
4. 4Value annual avoided loss = outage hours × value per hour for critical loads.
5. 5Compare to the marginal cost of storage above solar-only: BESS capex ÷ annual backup value to get backup-specific payback.

Worked example

A small manufacturing unit in UP: 8 outages/year × 4 hours = 32 outage hours/year. Critical load: ₹25,000/hour in lost production. Annual loss = ₹8 L. A 50 kWh BESS (₹18 L) provides 4 hours of backup at 12 kW → payback from backup value alone = 18 ÷ 8 = 2.25 years.

What you can calculate

• Outage cost ₹
• Uptime %
• SLA compliance
• Insurance saving

Frequently asked questions