Calculator · Batteries
Compare two battery quotes
Compare installed prices, usable capacities and first-year and longer-term results.
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How this tool works
Daily delivery is limited by spare solar after losses, available capacity after reserve and fade, and later use. Avoided import costs have export credits forgone and the entered annual fee subtracted. Seasonal mode uses 182 winter days and 183 summer days. Weighted time-of-use prices are an approximation, not interval simulation.
Simple payback divides installed cost by first-year net saving; the longer-term balance allows for the entered capacity fade. Finance, replacements, changing tariffs, maintenance, VPP rewards and grid charging are excluded.
Sources
In this example, spare solar after losses is 10.8 kWh, capacity after reserve is 12 kWh and electricity used later is 10.5 kWh. The smallest, 10.5 kWh, is the daily delivery.
Three limits. One useful amount of energy.
Daily delivery in this example:
10.5 kWh