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What to check before adding a battery to an existing Perth solar system
Take a free compatibility check for your existing solar system
Use 80-90% of your solar instead of exporting it for low feed-in rates
Keep essentials running during grid outages with backup power
Earn about $30–$80/year from Synergy Battery Rewards (10-13kWh, 6–12 typical events)
The battery connects to the solar panels before the inverter. It is the most efficient option at 98%, but it needs a compatible hybrid inverter.
The battery has its own inverter and sits on the AC side of your existing inverter, at a slightly lower efficiency of 94%.
In WA, adding a battery to an existing solar system counts as an alteration and can trigger whole-of-site compliance, so compare an AC-coupled retrofit against replacing your inverter with a hybrid. For many existing systems the sound path is replacing toward a DC-coupled / hybrid-inverter setup rather than expanding an AC-coupled one, avoiding future compliance limitations.
Battery size should match your evening and overnight use, plus the morning load before solar starts generating.
2-3 person household, 15-20 kWh/day usage
3-4 person household, 25-35 kWh/day usage
5+ person household, 40+ kWh/day usage
Answer eight quick questions about your solar system and home, and we'll match you with compatible batteries and an installer from our network that covers your area.
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