Weekend camping: fridge, lights and laptop
A two-day camping energy budget for a compressor fridge, camp lighting and three hours of laptop use each day.
Battery target for 2 days
Stated battery capacity, including a 20% extra energy margin on demand and 80% usable energy.
Adjust this exampleThis example uses 885 Wh per day. For 2 days without recharging, 20% extra energy and an 80% usable-energy allowance give a rated capacity target of 2,655 Wh. Continuous output and startup requirements remain separate checks.
- Energy per day
- 885 Wh Power × hours × quantity
- Power check
- 113 / 210 W Simultaneous / peak — planning values
- Solar target
- 300 W 4.5 peak sun hours · 75% yield
Solar is a separate estimate. The battery target is calculated without intermediate recharging.
Define the power requirement
This is a sizing target, not a list of verified Philippine recommendations.
2,655 Wh
Includes days, the extra energy margin on demand and the 80% usable-energy allowance
113 W · 210 W
Verify the exact appliance and inverter together
Check appliance voltage, frequency and sockets
Regional SKU, cable compatibility, warranty and stock still require confirmation.
The devices in this example
These are sensible starting values. Change the hours and exact devices in the planner to make the answer yours.
12V fridge — daily average
540 Wh per day- Average consumption
- 22.5 W
- Entered peak
- 120 W
- Hours per day
- 24 hours
- Quantity
- 1
LED camp lights
150 Wh per day- Average consumption
- 25 W
- Entered peak
- 25 W
- Hours per day
- 6 hours
- Quantity
- 1
Laptop
195 Wh per day- Average consumption
- 65 W
- Entered peak
- 100 W
- Hours per day
- 3 hours
- Quantity
- 1
Pre-cooling is stored energy
Cool the fridge and contents before departure where possible. Warm contents on arrival can keep the compressor running much longer.
Measure shade at the campsite
Four and a half peak-sun hours is an input, not a promise. Trees, panel angle and clouds can make the real day much weaker.
Calculation detailsSee the assumptions behind this answer
- The fridge’s 45W compressor is represented by a 50% daily duty cycle
- Camp lights total 25W for six hours
- Laptop averages 65W for three hours
- Solar planning uses a 75% yield rather than panel nameplate output
How the battery target is formed
885 Wh per day × 2 days × 1.2 ÷ 0.8 ≈ 2,655 Wh
The daily consumption above is rounded for display. The calculation uses unrounded values. The factor is 1 + the extra energy margin, added to demand rather than kept as battery charge; the 80% usable-energy allowance is a separate factor.