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Understand how Western Power export caps affect your solar system and how a battery can help you capture otherwise wasted energy.
The panel total on your quote or invoice, e.g. 6.6 kW.
Printed on the inverter label, e.g. 5 kW.
On a VPP connection the limit changes with grid conditions, so there's no fixed cap to check. Not sure? Your installer or Western Power connection approval will say.
A rough average of what runs during the day. Higher if someone is home using appliances.
Leave at 0 if you don't have one yet, or try a size you're quoted.
Lost each month
Estimate for an average day in each month, using Perth's Bureau of Meteorology sun hours and typical system losses. Averaging smooths out the sunniest middays, where most clipping happens, so treat this as a minimum. It assumes the battery charges from solar that would otherwise be lost.
This information is general in nature and does not constitute financial, tax, or legal advice. Rebate amounts, eligibility, and tariff rates change frequently and may not be current.
Consult a licensed financial advisor, tax professional, and electricity retailer to understand your specific situation. We are not responsible for financial decisions made based on this information.
See how different export limits affect an entry-level 6.6kW system during peak generation (midday summer):
| Export Limit | Peak Generation | Self Use | Exported | Clipped | Annual Loss |
|---|---|---|---|---|---|
| 1.5 kW | 5.5 kW | 1.0 kW | 1.5 kW | 3.0 kW (55%) | ~2,500 kWh |
| 5 kW | 5.5 kW | 1.0 kW | 4.5 kW | 0 kW (0%) | 0 kWh |
* Estimates based on typical Perth solar production patterns. Actual clipping varies by season, weather, and consumption patterns.
During midday, your solar panels generate more power than you can use or export to the grid.
Instead of being wasted, excess energy flows into your battery until it's full.
Use stored energy in the evening when solar isn't generating, avoiding expensive grid power.
Western Power's flexible export program allows higher exports during favorable grid conditions and may reduce exports during peak demand. This requires compatible inverter/battery systems.
Distributed Energy Resources (DER) compliance requires your inverter to respond to grid signals. Most modern inverters (Fronius, SolarEdge, Sungrow, etc.) support this.
When export is curtailed, a battery stores the excess energy instead of wasting it. You can then use this energy in the evening or export it when limits are lifted.
Your actual export setting is the one approved by Western Power/your retailer, not what your installer suggested.
The guided matching tool considers your export limit, system size, and usage patterns to recommend the best battery for capturing clipped energy.
Get a quote from an installer from our network that covers your area. You choose whether to act on it. No obligation.