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Choosing the right battery size is crucial for maximizing value and avoiding overspending. This guide helps Perth homeowners calculate their ideal battery capacity.
Your battery needs to cover energy use from sunset to sunrise when solar isn't generating. In Perth, this is typically 6pm to 6am (12 hours).
Most batteries shouldn't be fully discharged. Modern LFP batteries allow 90-100% depth of discharge, but it's wise to plan for 80-90% to extend lifespan.
Formula: Required capacity = Evening usage ÷ 0.9
Example: 15.2 kWh ÷ 0.9 = 16.9 kWh battery needed
Do you want to power your entire home during a blackout, or just essentials? This affects sizing:
Fridge, lights, WiFi, phone charging
5-7 kWh sufficient
Everything including AC, pool, cooking
13.5-20 kWh recommended
Perth summers drive significant evening energy use. A 2.5 kW reverse-cycle AC running 4 hours per evening adds 10 kWh to your daily battery requirement. Consider:
Run pool pumps during solar generation hours (10am-3pm) rather than from battery. A typical pool pump uses 1-2 kW for 6-8 hours daily - that's 6-16 kWh that shouldn't come from your battery.
The WA battery rebate provides $$130/kWh for eligible batteries up to 10kWh. This creates a sweet spot:
The rebate is capped at 10kWh ($$1,300 for Synergy customers), so larger batteries still qualify but receive the same maximum rebate.
Best for: Uncertain usage, budget constraints, future-proofing
Best for: Known usage patterns, long-term planning, premium features
Your battery doesn't need to cover 24-hour usage - solar handles daytime. Only size for evening/overnight consumption (typically 50-60% of daily usage).
Perth's summer AC demand can double evening energy use. Size for summer peaks, not winter averages.
Blackouts in Perth are rare (average 1-2 per year, lasting 1-3 hours). Don't oversize purely for backup unless you have medical equipment or work-from-home requirements.
Synergy Battery Rewards typically triggers 15-25 activation events per year, discharging your battery for grid support. If you're participating in VPP, consider a 10-20% capacity buffer to ensure you still have power for your home on those evenings.
Our battery calculator uses your actual usage data and Perth-specific factors to recommend the optimal battery size. It accounts for:
Use our sizing calculator or take the quiz to get personalized recommendations based on your actual usage and Perth-specific factors.