Worked example
A 10 kWh battery used for around three-quarters of a full cycle per day can shift a meaningful amount of energy, but payback depends heavily on the price gap and how often the battery is genuinely useful.
Frequently asked questions
Why use opportunity cost for solar?
If exported solar would otherwise earn money, storing it is not free. Use the export value you give up as the stored energy cost.
Does this include degradation?
No. Reduce average usable capacity or useful cycles for a more conservative long-term estimate.