A solar generator is a portable power station that you charge with solar panels. To choose one, look at the battery capacity in watt-hours, the output in watts, the battery type and how much solar input it accepts. Well-known makers include EcoFlow, Jackery, Bluetti, Anker SOLIX and Goal Zero.
Start with what you want to run, not the brand. A unit that suits a weekend camping trip is the wrong tool for keeping a freezer going in a power cut, and the other way round. Once you know your devices and how long you need them, the spec sheet gets much easier to read.
What a solar generator is and isn't
Despite the name, there's no engine inside. It's a large rechargeable battery, an inverter that turns the stored power into the mains-style electricity your devices expect, and a charge controller that handles the incoming power from panels. You can also charge most units from a wall socket or a car socket, which is handy on cloudy days.
It isn't a fuel generator. It's silent, it has no fumes and you can use it indoors (as long as the manufacturer says so), but it stores a fixed amount of energy and then it's empty until you recharge it. It also won't run a whole house. Big appliances such as electric ovens, central heating and air conditioning usually ask for more than a portable unit can give. For home backup, think essentials: lights, a router, phone and laptop charging, and sometimes a fridge.
Which one for which job
Camping
Weekend campers mostly need to charge phones, run lights, and maybe power a small fan or a camera battery charger. A small, light unit does the job. Weight and a carry handle matter more here than raw capacity.
Vans and RVs
Living in a van means running a fridge, lights, a laptop and a water pump over several days. Capacity matters, and so does being able to add panels on the roof or on the ground. Look for a unit that accepts a good solar input, because that decides how fast you can refill it on a bright day.
Backup for home essentials
For power cuts, pick a unit with enough output to start the items you care about, and check the surge rating for anything with a motor, like a fridge. Some units can be expanded with extra batteries, which helps if you want to cover more than one evening.
Off-grid cabins
A cabin is a long-term job, so battery type and cycle life count for more than weight. You'll likely want several panels and a larger battery. At some point, a fixed solar system with an installer may suit better than a portable unit, so it's worth comparing both.
Work sites
Tradespeople and event crews use them to run chargers, lights and small tools without a noisy generator. Output in watts and surge ability are the numbers to check, plus how well the case handles knocks and dust. If you're thinking about the wider picture, I've written about sustainability upgrades that can save a business money.
Spec glossary: what the numbers mean
| Term | What it means | Why it matters |
|---|---|---|
| Wh (watt-hours) | The battery's capacity: how much energy it stores | Bigger means longer run time |
| W (watts) | How much power the unit can deliver at once | Must be higher than the total of what you plug in |
| Surge | A short burst of extra output for starting motors | Fridges and power tools need more to start than to run |
| LiFePO4 vs NMC | Two battery chemistries. LiFePO4 is known for long life and stability but is heavier. NMC is lighter for the same capacity | Choose by how often you'll use it and whether you'll carry it |
| MPPT | A charge controller that finds the best working point of the panels | Better charging from the same panels, especially in changing light |
| Pass-through charging | Powering devices while the unit itself is charging | Some units limit this, so check the manual |
How to size one, step by step
- List every device you want to run.
- Find the watts for each one on its label or charger.
- Estimate the hours you'll use each one.
- Multiply watts by hours to get watt-hours for each device, then add them up.
- Add a buffer, because the inverter wastes some energy and batteries shouldn't be run completely flat.
- Check the unit's output in watts covers everything running at the same time, including any surge.
- Work out the solar side: panel watts multiplied by your usable sun hours gives a rough daily refill.
Here's an illustrative example, not a statistic. A laptop at 60 W for 5 hours uses 300 Wh. Two LED lights at 10 W each for 4 hours use 80 Wh. A phone top-up uses a small extra amount. That's about 400 Wh for the evening, so a unit with a bit more than that gives you a safe margin. Sun hours change with season, weather and where you live, so treat any panel estimate as rough.
The well-known makers
I can't tell you which is best for you without knowing your devices, so here's what each one is known for. Specs change often, so check the current model details before you decide.
EcoFlow
Known for fast charging and expandable systems, with a range that stretches from small portable units to larger home-backup setups.
Want AI doing the heavy lifting in your marketing?
I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.
Jackery
One of the names most people recognise in portable power stations. It's known for simple, easy-to-use units and matching foldable solar panels, which suit campers and first-time buyers.
Bluetti
Known for a strong focus on LiFePO4 batteries and larger, expandable systems, which appeal to people planning cabin or home-backup use.
Anker SOLIX
Comes from Anker's long history in chargers and batteries. The SOLIX line covers portable power stations and solar products, and it's often looked at by people who already like Anker's accessories.
Goal Zero
A long-standing name in outdoor power, known for its Yeti range and for products aimed at campers, overlanders and people who want something built for rough use.
Make a solar generator or power station? See how to get it featured on this list.
Safety and storage
- Follow the manufacturer's instructions on where to use and charge it, and keep it dry and out of direct heat.
- Don't leave it in a hot car or in freezing conditions for long periods, because extreme temperatures affect batteries.
- Use the cables that came with it, or ones rated for the same load.
- Leave air space around the vents while it's running.
- For long storage, keep it part-charged, in a cool, dry place, and top it up now and then. Check the manual for what your model needs.
- Never open the case or try to repair the battery yourself.
- If you want to share what you know about solar, here's how to write for my solar section.
Frequently asked questions
What size solar generator do I need?
It depends on what you want to run and for how long. Add up the watt-hours for each device, add a buffer, and check the unit's output in watts covers everything running at once.
Can a solar generator run a fridge?
Many can run a small fridge for a while, but it depends on the fridge's running and starting power and the unit's capacity. Check the surge rating and the fridge's label.
How long does a solar generator take to charge with panels?
It depends on the panel wattage, the unit's maximum solar input, the weather and the time of year. Bright sun and a good match between panels and unit make the biggest difference.
Is a solar generator better than a petrol generator?
It's quieter and has no fumes, so it suits indoor and camping use. A fuel generator can run longer for heavy loads, so the better choice depends on your needs.
