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How to Size an Off-Grid Solar System
Learn how to calculate the battery, inverter, and solar panel size required for an off-grid home or cabin.
Estimate Your Daily Power Usage
Appliances | Watts | Hours | Daily Energy |
|---|---|---|---|
Water Pump | 600 W | 0.5 h | 300 Wh |
Energy Efficient Fridge | 120 W avg | 24 h | 1200 Wh |
Starlink Internet | 60 W | 12 h | 720 Wh |
Laptop | 60 W | 5 h | 300 Wh |
LED Lights (5 bulbs) | 50 W | 5 h | 250 Wh |
Typical off-grid cabin usage:
≈ 2–4 kWh per day
Typical homestead usage:
≈ 5–10 kWh per day
Calculate Your Battery Bank Size
Daily use | Backup Days | Battery Needed |
|---|---|---|
8 kWh | 2 days | 16 kWh |
5 kWh | 2 days | 10 kWh |
3 kWh | 2 days | 6 kWh |
Most off-grid systems are designed with 2–3 days of battery backup.
Calculate Your Solar Panel Size
Daily Use | Solar Needed |
|---|---|
8 kWh | ~3000 W solar |
5 kWh | ~1800 W solar |
3 kWh | ~1000 W solar |
In Canada most off-grid systems use 3–4 peak sun hours when sizing solar arrays.
Recommended Systems
Foundation 48 System
2–4 kWh daily usage
Includes:
​
-
5.1 kWh lithium storage
-
2.4 kW solar array
-
10 kW hybrid inverter
Homestead Core 10K
5–8 kWh daily usage
Includes:
-
10.2 kWh lithium storage
-
4.9 kW solar array
-
10 kW hybrid inverter
Energy Sovereign 15K+
8–15 kWh daily usage
Includes:
-
20.4 kWh lithium storage
-
8.2 kW solar array
-
12 kW hybrid inverte
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