Off-Grid Solar for a Small Cabin: What a Portable Power Station Can Do
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A portable power station plus 800W to 1,200W of panels can run a small off-grid cabin’s basics: lights, a fridge, a laptop, a router and a water pump. It cannot run electric heat, air conditioning or cooking. Below is a worked example with every assumption labelled, so you can swap in your own numbers.
How the numbers work: wattages are typical ranges from manufacturer spec sheets and efficiency labels, so check the label on your own appliance. Runtimes are calculated, not lab-tested: usable energy = rated Wh × 0.85, divided by average watts.
⚡ Quick Answer
- Add up your daily watt-hours first. Our sample cabin below uses about 2,100 Wh a day.
- Panels: daily Wh ÷ (sun hours × 0.75). That is about 700W at 4 sun hours and 1,120W at a gloomy 2.5.
- Battery: daily Wh ÷ 0.85 gives about 2,471Wh for one day with no sun. Bigger is better, for cloudy days.
- What stays off the list: space heating, A/C, cooking, large well pumps and anything with a heating element.
🧮 Step 1: Add Up the Daily Load
A sample weekend cabin (typical average watts, not measured, check the labels on your own gear):
| Load | Average watts | Hours per day | Wh per day |
|---|---|---|---|
| LED lights | 30 | 5 | 150 |
| Refrigerator (average) | 60 | 24 | 1,440 |
| Laptop | 50 | 4 | 200 |
| Wi-Fi router | 10 | 24 | 240 |
| Water pump | 100 | 0.5 | 50 |
| Phone and device charging | 20 | 1 | 20 |
| Total | 2,100 Wh |
Real use will vary. A fridge cycles on and off, so 60W is an average, not its running watts. See the fridge power guide for the detail.
☀️ Step 2: Size the Panels
Formula: panel watts = daily Wh ÷ (sun hours × 0.75). The 0.75 is our assumption for real-world losses.
| Sun hours per day | Panel watts needed for 2,100 Wh |
|---|---|
| 6 (summer, sunny site) | 467W |
| 4 (average day) | 700W |
| 2.5 (winter or cloudy) | 1,120W |
Design for your worst month. If you are only there on summer weekends, you can size down. Check your unit’s maximum solar input and voltage range before buying panels, as covered in the panel sizing guide.
🔋 Step 3: Size the Battery
For one full day without sun: 2,100 Wh ÷ 0.85 ≈ 2,471Wh. In practice:
| Unit | Capacity | Usable (×0.85) | Days of the sample load |
|---|---|---|---|
| Bluetti Elite 200 V2 | 2,073.6Wh | 1,763Wh | 0.8 |
| EcoFlow DELTA Pro | 3,600Wh | 3,060Wh | 1.5 |
| Jackery Explorer 1000 V2 | 1,070Wh | 910Wh | 0.4 |
A single 2,000Wh-class unit nearly covers one day. With panels topping it up each day, it carries you through. Two cloudy days in a row will need either more battery or a backup charging route like a car or generator. See charging without sun.
Quick picks
For a small cabin, the Elite 200 V2 offers the most usable energy of the two here, and you can add panels up to its solar input limit.
Bluetti Elite 200 V2 (2,073.6Wh, 2,600W): longest runtime of the three in this guide. Check Bluetti Elite 200 V2 Price
Jackery Explorer 1000 V2 (1,070Wh, 1,500W, 3,000W surge): lighter and cheaper. Check Jackery Explorer 1000 V2 Price
🚫 What a Portable System Cannot Do
- Electric space heating or water heating. Those loads run at 1,500W or more for hours.
- Air conditioning. See whether a solar generator can power a window A/C.
- Cooking with electric elements.
- A well pump with a large starting surge. Check the pump’s startup watts against the unit’s surge rating.
- Replacing a permanently installed system. A cabin you live in all year needs a professionally designed system. See whether a solar generator can power a whole house.
Use propane or wood for heat and cooking, and keep any fuel-burning appliance outdoors or properly vented. See our carbon monoxide safety guide.
✅ Bottom Line
For a weekend cabin, add up your watt-hours, buy panels for your worst-case sun, and a battery that covers at least a day. If your daily total is much over 3,000 Wh, or you need heat from electricity, you have outgrown a portable system.
A first aid kit belongs next to your backup power. SurviveX kits are designed in Falls Church, VA, reviewed in-house by a former EMT/firefighter, qualify for FSA/HSA spending, carry a lifetime warranty, and ship free over $50 (per survive-x.com). See SurviveX First Aid Kits
🔗 Related Guides
- How many solar panels to recharge a power station
- Charge a solar generator without sun
- Solar generator for camping
- Solar generator for whole house
- What appliances can a solar generator run?
- Plug-in solar vs solar generator
❓ Frequently Asked Questions
Can a portable power station run an off-grid cabin?
For basics like lights, a fridge, a laptop, a router and a small pump, yes. It cannot run electric heat, A/C or cooking elements.
How many solar panels do I need for a cabin?
Divide your daily watt-hours by sun hours times 0.75. A sample load of about 2,100 Wh needs roughly 700W at 4 sun hours and 1,120W at 2.5 sun hours.
What size battery do I need off grid?
At least one day of your load divided by 0.85, plus margin for cloudy days. The sample cabin here needs about 2,470Wh.
Can I run a well pump off a power station?
Possibly a small one. Compare the pump’s startup watts to the unit’s surge rating and its running watts to the output rating.
How do I heat an off-grid cabin?
Not with a power station. Use propane, wood or another heat source, and keep fuel-burning appliances vented or outdoors.