Complete Battery Storage Guide for Toronto 2025
Costs, rebates, backup power, solar pairing—everything you need to know about home batteries
A home battery (or "battery energy storage system") is a large lithium-ion battery—similar to electric car batteries—that stores electricity from the grid or solar panels. It provides backup power during outages and time-of-use savings by charging when electricity is cheap and discharging when it's expensive.
Backup Power
Automatically kicks in during blackouts. Powers fridge, lights, furnace, WiFi for 24-48 hours.
TOU Savings
Charge at off-peak (7¢/kWh), discharge at on-peak (18¢/kWh). Save $600-$1,200/year.
Solar Pairing
Store excess solar production for nighttime use. Achieve 85-95% net-zero (vs 70% solar-only).
Tesla Powerwall 2
13.5 kWh usable storage • 10 years warranty
LG Chem RESU
9.8-16 kWh usable storage • 10 years warranty
Enphase IQ Battery
10.08-40.32 kWh usable storage • 15 years warranty
🏠 Backup Power Only
Keep essentials running during outages
Best for: Areas with frequent blackouts, critical medical equipment
💡 TOU Optimization
Charge at off-peak, discharge at peak
Best for: Hydro One customers with time-of-use billing
☀️ Solar + Battery
Store excess solar, achieve 90%+ net-zero
Best for: Maximize solar investment, energy independence
Battery Energy Storage Systems
$300/kWh up to $5,000 (max 50% of equipment costs)
Eligibility Requirements:
- Must be paired with solar panels OR enrolled in TOU billing
- Minimum 5 kWh usable capacity
- Installed by HRSP participating contractor
- CSA-certified battery system
Calculation Example:
Tesla Powerwall 2 (13.5 kWh) = 13.5 × $300 = $4,050 rebate
LG Chem RESU (16 kWh) = 16 × $300 = $4,800 rebate
Pairing solar with a battery is the ultimate net-zero setup. Without a battery, solar panels only work during the day (you export excess to the grid). With a battery, you store that excess for nighttime use—maximizing self-consumption and energy independence.
☀️ Solar Only (No Battery)
- ✓ Net-zero: 65-75%
- ✓ ROI: 6-8 years
- ✓ Upfront cost: $11K-$19K
- ✗ No backup power
- ✗ Night: Grid-dependent
☀️🔋 Solar + Battery
- ✓ Net-zero: 85-95%
- ✓ ROI: 7-10 years
- ✓ Upfront cost: $18K-$28K
- ✓ 24-48hr backup power
- ✓ Night: Battery-powered
✓ Electrical Panel Upgrade
Batteries require 240V circuit + backup panel (critical loads only). Budget $1,500-$3,000 for electrical work.
✓ Temperature Requirements
Most batteries operate -10°C to +45°C. Install in basement/garage (not outdoors in winter). Frozen batteries void warranty.
✓ Warranty & Lifespan
10-15 year warranties. Batteries degrade ~2% per year. After 10 years: 80% capacity remaining (still usable).
✓ Critical Load Planning
13 kWh battery powers: Fridge (24hrs), furnace (48hrs), lights (72hrs), WiFi (96hrs). AC/stove drain batteries fast (4-6hrs).
Explore our other comprehensive guides
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