Making the economic case for battery storage requires analyzing multiple value streams: energy bill savings, demand charge reduction, backup value, and incentive programs. Here is a complete framework.
Value Stream 1: Energy Bill Savings
Batteries store cheap solar energy generated during the day for use during peak-rate evening hours.
- Peak rate hours: Typically 6pm–10pm (highest kWh cost)
- Off-peak rate hours: 10pm–6am (lowest kWh cost)
- Solar generation hours: 9am–5pm (often shoulder or off-peak rates)
With a battery, you shift solar generation to peak hours. Value: $0.10–0.30 per kWh shifted.
Value Stream 2: Demand Charge Reduction
Commercial customers pay for peak demand (kW) separately from energy (kWh). A battery can shave peak demand spikes.
Example: Factory with 200kW peak demand. Battery shaving 50kW for 4 hours daily. Annual demand charge savings at $15/kW/month: 50 x 15 x 12 = $9,000/year.
Value Stream 3: Backup Power Value
Value of uninterrupted operations during grid outages:
- Home with wine cellar/medical equipment: $50–200/outage-day
- Small business: $500–5,000/outage-day
- Manufacturing: $10,000–100,000/outage-day
Payback Calculation
48V 400Ah battery system (19.2kWh usable): $4,000–6,000 installed
Annual savings: $800–1,500 (energy shifting) + $500–2,000 (demand charge) = $1,300–3,500/year
Simple payback: 2–5 years (before incentives)
With 30% tax credit (US ITC): Payback reduces to 1.5–3.5 years
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