Battery Backup Power: Understanding Your Options

"Any battery provides backup power"

Not true. Many batteries are designed for self-consumption only. Backup requires additional infrastructure (essential loads panel, changeover switch) that must be installed during the battery installation.

"I can add backup later"

Technically possible, but expensive. Adding backup infrastructure after installation typically costs 30-50% more than including it initially. Plan for your backup needs upfront.

"10kWh battery = 10kWh of backup"

Backup systems typically reserve 20-50% of battery capacity for outages. A 10kWh battery with Level 3 backup might only provide 5-6kWh for daily use.

"Backup pays for itself"

Backup infrastructure costs $500-8,000 and provides no financial return. It's insurance against inconvenience, not an investment. We exclude backup costs from ROI calculations for this reason.

"My old switchboard will work fine"

Outdated switchboards often require upgrades for backup systems. If your switchboard uses ceramic fuses, has no RCDs, or is at capacity, you'll need an upgrade before backup can be installed. Budget $1,000-$3,000 extra for switchboard upgrades.

"Whole-home backup works everywhere"

Backup power flows like water - it can only go downstream. If power lines fork at the meter (common in units/multi-dwelling properties), whole-home backup won't work. If sub-boards are upstream of your main board, those circuits can't be backed up. Multi-dwelling properties often need per-unit solutions, not whole-property backup.