Understanding Your Power Needs
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| Sizing Metric | Formula & Example |
|---|---|
| Energy Consumption (Wh) |
Formula: Watts × Hours Example: 60W × 4 hrs = 240 Wh |
| Battery Capacity (Ah) |
Formula: Watt-hours ÷ System Voltage (V) Example: 240 Wh ÷ 12V = 20 Ah |
| Inverter Size (W) |
Formula: Total Watts × 1.25 (safety margin) Example: 300W × 1.25 = 375W → Use 400W inverter |
| Total Load Power (W) |
Formula: Sum of all appliance watts used simultaneously Example: Light (10W) + Fan (75W) = 85W |
| Runtime (hrs) of Battery |
Formula: (Battery Ah × Voltage) ÷ Total Load (W) Example: (100Ah × 12V) ÷ 240W = 5 hrs |
| Need / Application | System Recommendation |
|---|---|
| Basic lighting + phone charging |
Recommended Battery: 50Ah – 100Ah (12V) Inverter Size: 100W – 200W Notes: For small backup setups |
| Home office (laptop, fan, TV) |
Recommended Battery: 150Ah – 200Ah (12V or 24V) Inverter Size: 500W – 1000W Notes: For moderate usage with 4–6 hours of backup |
| Home backup (fridge, lights) |
Recommended Battery: 200Ah+ (24V or 48V recommended) Inverter Size: 1000W – 1500W Notes: Ideal for longer backups or heavier loads |
| Business / shop power backup |
Recommended Battery: 300Ah+ (48V system) Inverter Size: 2000W – 3000W Notes: Suitable for commercial setups or extended power outages |
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