How Long Will a Solar Generator Power a Fridge, Router and Lights?
Short answer: Running a standard fridge (120W, 40% duty cycle), a router (15W), and 4 LED lights (40W, 6h/day), your daily consumption is approximately 1,752 Wh. A 2,000 Wh solar generator covers this load for about 27 hours. A 1,000 Wh unit covers roughly 13 hours. Exact runtime depends on your specific appliances and inverter efficiency.
The Three-Load Calculation
This is the most common home backup scenario: keep the food cold, stay connected, and have light. It’s the minimum viable setup for most power outages. Here’s how to calculate runtime precisely for your situation.
| Load | Running watts | Hours/day | Duty cycle | Daily Wh |
|---|---|---|---|---|
| Refrigerator | 120W | 24h | 40% | 1,152 Wh |
| Router / WiFi | 15W | 24h | 100% | 360 Wh |
| LED lights ×4 | 40W | 6h | 100% | 240 Wh |
| Total | 1,752 Wh/day |
Runtime by Solar Generator Capacity
Runtime formula: Usable capacity (Wh) ÷ Daily consumption (Wh) × 24 = Hours of runtime
Note: usable capacity is typically 80–90% of rated capacity due to inverter losses and battery management. We use 85% as a conservative estimate.
| Solar generator | Rated capacity | Usable capacity (85%) | Runtime (fridge+router+lights) |
|---|---|---|---|
| EcoFlow Delta 2 | 1,024 Wh | 870 Wh | ~12 hours |
| Jackery Explorer 1000 Pro | 1,002 Wh | 852 Wh | ~12 hours |
| Bluetti AC180 | 1,152 Wh | 979 Wh | ~13 hours |
| EcoFlow Delta 2 Max | 2,048 Wh | 1,741 Wh | ~24 hours |
| Bluetti AC200P | 2,000 Wh | 1,700 Wh | ~23 hours |
| Jackery Explorer 2000 Pro | 2,160 Wh | 1,836 Wh | ~25 hours |
| EcoFlow Delta Pro | 3,600 Wh | 3,060 Wh | ~42 hours |
What Reduces Runtime in Practice
Ambient temperature: Fridges work harder in warm kitchens. If your kitchen is above 75°F (24°C) during summer, increase the fridge’s duty cycle estimate from 40% to 50–55%. This reduces runtime by 10–15%.
Fridge door openings: Every time you open the fridge during an outage, the compressor runs longer to recover temperature. Minimize openings and keep the fridge full — a full fridge maintains temperature longer.
Battery age: A battery that has completed 1,000+ cycles delivers approximately 80–85% of its original capacity. A 2,048 Wh unit at 1,500 cycles may deliver closer to 1,700 Wh. Factor this in for older units.
Cold temperatures: LiFePO4 batteries lose 10–20% capacity below 32°F (0°C). If your generator is stored in a cold garage during winter outages, expect reduced runtime.
Real-World Scenario
Summer power outage. Kitchen at 78°F. Standard fridge, router, 4 LED lights. EcoFlow Delta 2 Max (2,048 Wh):
Fridge duty cycle at 78°F: ~50% → 1,440 Wh/day (vs 1,152 Wh in normal conditions)
Router: 360 Wh/day
Lights: 240 Wh/day
Total: 2,040 Wh/day
Usable capacity: 1,741 Wh
Realistic runtime: ~20–21 hours — not the full 24.
This is why sizing for normal conditions often leaves you short during summer outages. Add 15–20% to your estimates if you live in a warm climate or your outages tend to happen in summer.
Honest Recommendation
For true 24-hour coverage of fridge + router + lights, target a unit with at least 2,200–2,400 Wh rated capacity. The EcoFlow Delta 2 Max (2,048 Wh) covers it in normal conditions but cuts close in summer. The Jackery Explorer 2000 Pro (2,160 Wh) and Bluetti AC200P (2,000 Wh) are in the same range.
If you want genuine peace of mind for a full 24 hours in any season, the EcoFlow Delta Pro (3,600 Wh) provides real margin — approximately 42 hours at this load level.
Who This Is Not For
If you also need to run a CPAP machine, well pump, or electric heating, add those loads to the calculation — runtime drops significantly. Use our solar generator sizing guide for a full multi-load calculation.
Related Guides
- Solar generator sizing guide for home power outages
- How many Wh do I need to run a fridge for 24 hours?
- EcoFlow Delta Pro vs Bluetti AC300: honest comparison
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Frequently Asked Questions
- How long will a solar generator run a fridge, router, and lights?
Running a fridge (1,152 Wh/day), router (360 Wh/day), and 4 LED lights (240 Wh/day) uses approximately 1,752 Wh per day. A 2,048 Wh solar generator covers about 24 hours. A 1,024 Wh unit covers about 12 hours. - Does ambient temperature affect solar generator runtime?
Yes. In summer heat above 75°F (24°C), refrigerators work harder and duty cycle increases from 40% to 50-55%. This reduces runtime by 10-15%. A unit that covers 24 hours in normal conditions may only cover 20-21 hours in a hot summer kitchen. - What uses the most power during a home backup scenario?
The refrigerator is typically the largest load at approximately 1,152 Wh per day (120W at 40% duty cycle). This represents about 65% of a typical essential-loads backup scenario.