Worked example
If import costs 28p/kWh and export earns 15p/kWh, each extra kWh moved from export to self-use adds roughly 13p of value before equipment costs.
Frequently asked questions
Does higher self-consumption always mean better economics?
No. Expensive equipment can cost more than the extra energy value it creates.
What if export pays well?
A high export rate reduces the benefit of storing or diverting solar.