Plug-in solar or a power station, if you rent

People arrive here with one of two goals written in their search: lower the bill, or keep the lights on. The products that address those goals look almost identical in a listing photograph, and the marketing does nothing to separate them.

A plug-in kit is a small solar array with a grid-tied microinverter. It connects to a normal wall outlet and behaves like a tiny power plant on the house side of the meter. Its job is to make kWh while the sun is up.

A power station is a battery with an inverter, plus a solar input. Its job is to hold energy and release it later. The panels, when they exist, are simply a charger that does not need an outlet.

Those two sentences do not overlap, which is why the choice is decided by your goal rather than by the specification sheet.

Follow one kWh from the panel and the two products diverge at the second step.

That table explains most of the confusion in this category. The kit is not a weaker station, and the station is not a battery added to a kit. They sit on opposite sides of the meter.

For the full chain on the kit side, the guide on how plug-in solar works walks from panel to meter, including the shutdown rule.

Choose the kit when the goal is a lower bill and the house is occupied during the day. A refrigerator, a router and a few devices running while the sun is up is exactly the load profile this product was built for, because the energy never has to be stored.

The kit also wins on simplicity of physics: no battery means no degradation, no depth-of-discharge limit, and no round-trip loss. A kWh made and used on site is worth the full retail rate, and nothing is lost in between.

Two conditions have to be true. The utility has to allow the connection, and the household has to accept that the system does nothing in an outage. If either fails, this is the wrong product regardless of the numbers.

Choose the station when the goal is keeping specific appliances alive, especially in an outage, and especially where the wiring cannot be touched. A renter who cannot modify the building can still carry a station in and plug a fridge into it.

It also wins when the solar site is poor. A station charged from the wall at night, under a time-of-use tariff, can arbitrage the price difference; a kit with no good sun just produces less.

The trade is that the station does not reduce consumption. Every kWh it delivers was bought, just at a different time, and the round trip through the battery costs something in both directions.

Take a household that uses 2,400 watt hours a day of the load it cares about, in a location with 4.5 sun hours, and compare two purchases at the same rough budget.

The arithmetic is deliberately unflattering to the station on the bill line, because that is the honest comparison. A station is a backup purchase with a modest arbitrage bonus; a kit is a bill purchase with no backup at all.

The load calculator produces the daily figure for your own kit, and the battery sizing calculator turns it into a bank size if you go the station route.

Most of the disappointment in this category comes from expecting one product to behave like the other. The list is short and worth reading before buying.

The 240 V row surprises people. Neither product runs a well pump, a dryer or a central air conditioner, because both output 120 V. That limitation comes from the category, not from the model you choose.

Ownership changes the answer more than any specification. A renter cannot usually modify the building, so the kit's need for a proper circuit connection and a utility interconnection becomes a real obstacle rather than paperwork.

A homeowner has the opposite problem: the electrical work is possible, but it also opens the question of whether the money is better spent on more panels, on insulation, or on a battery that keeps the fridge alive when the grid fails.

The awkward middle case is the condo owner. The balcony is theirs to use but the building's rules and the fire code are not, which is why the balcony kit has its own guide rather than a paragraph here.

There is a fourth case worth naming: the household that already owns a generator. Neither product replaces it, because a gasoline generator runs 240 V loads and refuels in minutes, at the cost of noise, exhaust and fuel storage. The comparison that matters for those households is not kit against station, it is whether either can carry the loads that were previously the generator's job, and in most homes the answer is that both can handle the lights and the fridge while neither can handle the well pump.

Five grid-tied kits and five stations, because those are the two ends of the comparison. None of these is a recommendation; the point is the shape of each product, not the badge.

For the kits alone, the plug-in panel comparison covers certification and completeness. For the stations alone, the portable power station ranking compares capacity and output.

Buying a station to lower the bill. Without a time-of-use rate there is no arbitrage, and the round trip costs energy instead of saving it.

Buying a kit for outages. It is required to shut down when the grid does, so the purchase does not deliver what was wanted.

Comparing wattage across the two. An 800 W panel and an 800 W inverter are not the same quantity, and the kit's 800 W produces far less energy in a day than the number suggests.

Forgetting the circuit. A kit above the continuous limit for one 120 V circuit needs an electrician, which changes the cost comparison.

Assuming both can be combined. They can coexist, but you cannot feed a grid-tied inverter through a battery and expect it to keep producing during an outage.

If a figure here disagrees with a calculator on this site, the calculator is the source of truth and the changelog records each correction.

Question one: what do you want the machine to do in the next outage? If the honest answer is nothing, the kit is the right purchase and the station is money spent on insurance you decided not to buy. If the answer involves a fridge, then the kit is disqualified no matter how good its production figures look.

Question two: is the house occupied during the day? A kit's value depends on something being on while the sun is up. A household that leaves at eight and returns at six captures very little of its own production, and what it does capture is exported at whatever rate the utility pays, which is often a third of retail. The same household charging a station overnight and running the fridge on it under a time-of-use tariff may do better, which is the one case where the station wins a bill argument.

Question three: can the wiring be touched at all? A kit needs a circuit connection and an interconnection process. A station needs a socket. That single sentence reorders the two products for every renter, and it is not something a specification sheet can tell you.

Answering those three in order takes about a minute and eliminates one product in most cases. The remainder of the decision is sizing: how many panels for the load you want to offset, or how many watt hours for the hours you want to survive.

One useful sanity check before buying either: write down what you would actually keep running during a three-day outage. That list is usually shorter than expected, and the shorter it is, the more likely a station is sufficient and a kit is beside the point.

Neither of these burns fuel. If that is the alternative you are weighing, see solar generator versus gas generator.

Budgeting rather than choosing? The cost of adding storage breaks the three routes down by price and scope.