The value of storing solar depends partly on what you give up by not exporting it.
The Short Answer
If your export payment is attractive, storing every spare solar unit is not automatically the best financial choice. Compare export income with the cost of replacing that energy later and the value of avoiding higher import rates.
Export is a real alternative
Excess solar sent to the grid can earn an export payment. When you divert that electricity into a battery, the export payment you forgo becomes part of the storage decision.
When storage wins
Battery storage is more attractive when stored solar later avoids a much higher import rate, particularly during expensive peak periods.
When export can win
If the export payment is close to or above the effective cost of buying electricity in a cheap period, exporting and later grid-charging can be competitive.
Think in annual terms
Do not base the decision on one sunny day. Winter generation, summer surplus, battery losses and tariff changes all affect the full-year result.
Key Takeaway
Battery economics depend on the complete energy flow: what electricity costs when you charge, what it would cost when you discharge, what solar export is worth, and how efficiently the battery is used.
Frequently Asked Questions
Should I always prioritise self-consumption?
Not necessarily. Financial optimisation should compare the value of self-consumption with the export payment and future import cost.
Does battery efficiency matter?
Yes. Energy stored and later discharged is subject to conversion losses.
Can my battery export to the grid?
Capabilities and supplier arrangements vary. Do not assume battery export is permitted or commercially rewarded under your plan.
Compare Export vs Storage
Use your actual export rate and import tariff to set the right battery priority.
Tariffs, supplier terms and export payments change. Check the current plan details before making a purchasing or settings decision.