What a solar generator actually is

A generator converts motion into electricity. Nothing in one of these units moves.

What is actually in the case is a battery pack, an inverter that turns its DC into household AC, a charge controller that accepts solar input, and a battery-management board watching the cells. That is a portable power station. The industry adopted “generator” because the product replaces one in the buyer’s mind — you reach for it when the power goes out — and because a shopper who has never heard the phrase “power station” will still search for a generator.

This matters commercially rather than pedantically. Once you know the two phrases name the same shelf, the price and specification differences between a “solar generator” listing and a “portable power station” listing become visible, and they are frequently the same unit.

The battery decides what you can run. The panel only decides how you refill it — slowly.

A kit pairing a kilowatt-hour-class station with a 100W panel is common. Under ideal test conditions that panel produces 100W; across a real day, after angle, temperature, haze and the charge controller’s own losses, a widely used planning assumption is four to five useful sun-hours. That is roughly

None of that makes the panel useless. It makes the panel an accessory whose size should be chosen against the station’s solar input ceiling and your actual daily draw — which is a different decision from accepting whatever the carton contained.

The honest summary is duration. Outages measured in hours favour the battery on every axis that is not raw capacity. Outages measured in days without sun favour the machine that can be refuelled, and the people who are happiest with a battery are usually the ones who sized it for the outage they actually get rather than the worst one they can imagine.

Size the battery against a day of your own load, then size the panel against the battery. Doing it in the other order is how people end up with a panel that cannot keep up.

The three buyers who search for this term want quite different machines, and the term itself hides the difference. A camper needs enough energy for a couple of nights and a weight they can carry. A home-backup buyer needs enough to cycle a refrigerator and start a motor. An RV or van owner needs a unit that recharges while driving as well as from the roof. The battery figure that satisfies one of those will disappoint the other two.

Work the number properly rather than from a band: list what you will run, multiply watts by hours, and add about 15% for inverter losses. The sizing tool does it from a load list, and the outage checklist works a full 72-hour budget end to end.

Four numbers decide whether a kit is honest. None of them is the headline.

Bundles are priced as a package precisely because the package is hard to compare. Split it back into parts and the questions become answerable. Battery watt-hours set how long you run. Continuous inverter watts set what you can plug in, and the separate surge rating sets whether a motor will start. Maximum solar input caps how quickly any array can refill it — a panel larger than that ceiling is wasted money, and one far below it means recharging takes days.

Then check the panel against that ceiling. A kit pairing a 2,000Wh station with a single 100W panel is not a solar system; it is a station with an accessory, and the listing will rarely say how many days a full refill takes. Our panel-pairing guide works the derating chain, and the solar recharge tool shows whether an array actually covers a daily draw.

Same hardware, three different priorities — and the one that changes most is not capacity.

For home backup, the deciding specification is usually surge, not storage. A refrigerator, a well pump and a furnace blower all draw far more at the instant they start than they do while running, and a unit that comfortably carries the running load will still trip on the spike if its surge rating falls short. Transfer speed matters too if you want the changeover to be invisible to a desktop or a router. See best for home backup.

For camping, weight per watt-hour is the constraint that actually bites, and the panel earns its place because there is no wall socket to fall back on. For RV and van use, the differentiators are expansion and alternator or DC charging — the ability to grow the bank, and to refill it from the engine on a cloudy travel day. Compare those directly on best for camping and best for RV and van life.

We review 80 stations across 17 brands on the specification that decides the purchase.

That review is built on structured, sourced specification for every station in the catalogue and a published formula that orders them, which settles which box holds more energy, which inverter starts more appliances, and which claims a manufacturer has and has not substantiated. Where it stops is your particular roof in November: panel output there is set by pitch, shading, and weather, and no specification predicts those.