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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.
See how different export limits affect a typical 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 |
| 3 kW | 5.5 kW | 1.0 kW | 3.0 kW | 1.5 kW (27%) | ~1,200 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.
Our battery quiz considers your export limit, system size, and usage patterns to recommend the best battery for capturing clipped energy.