Battery Storage
Battery storage is a system that captures electrical energy in chemical form and releases it later as electricity, allowing excess power—often from solar panels—to be saved for use when generation is low or demand is high.
How Battery Storage Works
Battery storage devices contain one or more electrochemical cells that convert electricity into stored chemical energy (charging) and reverse the process to produce electricity (discharging). When a solar PV array generates more power than a home or grid needs, the surplus is routed to the battery, raising its state‑of‑charge measured in kilowatt‑hours (kWh). Later, when the sun sets or demand spikes, the battery releases that stored energy back into the circuit.
Why It Matters
- Time‑shifting: Aligns solar generation with consumption, reducing reliance on the grid.
- Peak shaving: Supplies power during high‑price periods, lowering electricity bills.
- Grid stability: Provides fast‑response reserves that help balance supply and demand, especially as more intermittent renewables connect.
- Energy independence: Enables households and businesses to operate during outages.
Concrete Example
A typical residential battery in Israel, such as a 10 kWh lithium‑ion system, can power an average Israeli home for about 12‑14 hours of night‑time lighting, refrigeration, and a few appliance cycles. In a sunny month, a 5 kW rooftop PV system may produce roughly 800 kWh; storing 10 kWh captures about 1.25 % of that output, enough to cover a night’s essential loads without drawing from the grid.
Relevance to Solar Energy in Israel
Israel enjoys high solar irradiance—average daily insolation of 5.5–6 kWh/m²—leading to rapid growth of rooftop PV installations. However, most generation peaks around midday, while residential demand peaks in the evening. Battery storage bridges this gap, allowing the excess midday energy to be saved for evening use. Government incentives, such as the Net‑Metering program and recent subsidies for residential storage, are encouraging wider adoption. Moreover, large‑scale battery farms are being deployed to support the national grid, helping to smooth fluctuations from the expanding solar fleet.
Bottom Line
Battery storage turns intermittent solar power into a reliable, dispatchable resource, enhancing cost savings, resilience, and the overall sustainability of Israel’s energy system.