For a weekend market setup, the right portable solar generator depends less on the “biggest number” and more on what you actually power and for how long. If your load is mostly light stuff like a phone, a card reader, LED string lights, and a small fan, you usually do not need a huge power station. In many cases, a unit in the 300Wh to 700Wh range is enough for a full market day, especially if you are using efficient LED lighting and not running heat-producing equipment.
A good way to think about it is to estimate your daily use. A phone might use 10 to 20Wh over a day, a card reader is tiny, LED lights might use 10 to 30W depending on length, and a small fan may use 10 to 40W. If you run lights and a fan for 8 hours, that can easily land in the 100Wh to 400Wh range before losses. Since no battery gives you perfect usable capacity, it is smart to leave a margin. That is why a 500Wh class unit is often the sweet spot for market vendors. It gives you breathing room without becoming too heavy or expensive.
If you plan to power anything beyond the basics, like a portable blender, a small cooler, a laptop, or a point-of-sale printer, then I would move up to something closer to 1000Wh. That extra capacity matters more than peak wattage for long days. Peak wattage is still important, though. Make sure the inverter can handle the startup surge of your fan or any other device you plug in. For most booth setups, 300W to 600W of continuous output is plenty, but higher is better if you want flexibility.
Weight and charging speed matter a lot at weekend markets. A unit that is easy to carry from your car to the booth is worth more than a massive battery you dread moving every Saturday. Also check whether it can recharge fast from the wall between market days, because solar input alone may not fully refill it if you have limited sun or short setup windows. If you want true solar charging, look for a model that supports at least 100W of solar input; 200W is better if you expect to recharge during the day.
My honest recommendation would be to aim for a portable solar generator around 500Wh, with a pure sine wave inverter and enough output headroom for your fan and lights. Pair it with efficient LED gear and a small foldable solar panel if you want extra flexibility. People who sell at markets often underestimate how much they value quiet power, no fuel, and not having to hunt for an outlet.
If anyone here has run a booth with one, I’d love to hear what battery size actually worked in real life and whether solar input helped much during the day.
