Backup power for renters and apartments: no-install options

Most home battery coverage assumes you own the panel. If you rent, or live in a condo or apartment, the entire installed-battery path is closed before it starts: no panel access, no transfer switch, no permit in your name, no utility interconnection on someone else's service. What is left is the plug-in path, and it is more capable than it used to be. The five picks above are power stations sized for apartment loads, every figure taken from the maker's own published spec table. We have not lab-tested any of them, and the Amazon links above are affiliate links, disclosed at the top of this page.

What a renter can and cannot run

The hard boundaries are the same in every apartment, and they come from the hardware rather than from your landlord:

• No 240V. Every pick on this page publishes 120V output only. Electric ranges, electric dryers, and most central air handlers are 240V split-phase loads and cannot run from any of these units at any wattage. The plug-in units that do publish a 120/240V port are a different, larger class covered in our plug-in backup guide.
• No transfer switch, so no hardwired loads. A transfer switch is what lets a battery feed circuits in a panel, and installing one is electrician work on the building's electrical system. Without it, anything hardwired stays dark: ceiling lights, the built-in microwave on its own circuit, a hardwired range hood, the building's heat.
• No automatic whole-unit backup. These units back up what is plugged into them. Three of the five publish a UPS switchover figure, which means a device already plugged into the unit rides through an outage without rebooting, but that only covers devices already on the unit.
• Outlet-rated, not headline-rated, in one case. Read the output line as a total. EcoFlow publishes the DELTA 3 Plus at 1,800 W total across six outlets, not 1,800 W per outlet, and the RIVER 3 Plus at 600 W total across three.

What that leaves is a real list: refrigerator, router and modem, phones and laptops, lamps, a CPAP or other bedside device, a fan, a small television, and a countertop appliance run one at a time. For a lot of apartment outages, that list is the whole problem.

Sizing it with your own numbers

Manufacturers publish capacity in watt-hours. Your appliances publish consumption in different units, so two conversions do most of the work.

Step one: get the average watts. The yellow EnergyGuide label the FTC requires on most home appliances reports estimated yearly energy use, and the FTC is explicit that this is an estimate based on typical use, not a promise. Where the label gives kilowatt-hours per year, divide by 8,760 hours to get average watts. A label reading 350 kWh per year works out to 350,000 divided by 8,760, or about 40 W on average. That average already accounts for the compressor cycling on and off, which is why it is far below the number stamped on the compressor.

Step two: derate the battery. Rated watt-hours are stored energy, not delivered energy. Inverter conversion loss is real and none of these makers publish a single household efficiency figure, so we assume 85 percent throughout this guide as a working figure and label it as an assumption, not a spec.

Worked example, DELTA 3 Plus. 1,024 Wh rated, times our assumed 0.85, is about 870 Wh delivered. A 40 W refrigerator average leaves roughly 21 hours. Add a 12 W router and the pair draws about 52 W, which is roughly 16 hours. Same arithmetic on the DELTA 2 Max: 2,048 Wh times 0.85 is about 1,741 Wh, or about 33 hours on that same 52 W pair.

Worked example, small tier. The RIVER 3 Plus holds 286 Wh. At 0.85 that is about 243 Wh, which will not carry a refrigerator overnight, but it runs a 12 W router and a 10 W lamp for roughly 11 hours, and it recharges phones many times over. It is a communications and lighting unit, and it is honest about it at 10.4 lb.

Change the assumption and the answer changes with it. That is the point of writing the assumption down.

Where the specs differ, and why it matters in an apartment

• Switchover. EcoFlow publishes under 10 ms for both the RIVER 3 Plus and the DELTA 3 Plus. Anker publishes 10 ms for the C1000 Gen 2, and says every AC output port on it supports UPS. Jackery does not publish a switchover figure for the Explorer 1000 v2, and EcoFlow's DELTA 2 Max spec table does not carry one either, so we print none for those two. A published UPS rating is a manufacturer claim about the unit, not a guarantee for every device you plug into it.
• Cycle life uses different floors. EcoFlow rates the DELTA 3 Plus at 4,000 cycles to 80 percent or better and the DELTA 2 Max at 3,000 cycles to 80 percent or better. Anker publishes that the C1000 Gen 2 retains at least 80 percent after 4,000 cycles. Jackery rates the Explorer 1000 v2 at 4,000 cycles to 70 percent or better, a lower bar, so its 4,000 is not directly comparable to EcoFlow's 4,000 despite matching on paper.
• Weight is a real constraint here. Apartment storage is a closet, and the unit has to move to the outlet that matters. Published net weights run from 10.4 lb on the RIVER 3 Plus to 23.8 lb on the Explorer 1000 v2, 24.9 lb on the C1000 Gen 2, 27.6 lb on the DELTA 3 Plus, and 50 lb on the DELTA 2 Max.
• Noise, where it is published. EcoFlow publishes the RIVER 3 Plus at under 30 dB, and the DELTA 3 Plus at under 30 dB at 600 W and under 40 dB at 1,200 W. In a studio, the load level you run at decides how loud the fan gets.
• Expansion. EcoFlow publishes expansion to 858 Wh on the RIVER 3 Plus, up to 5 kWh on the DELTA 3 Plus, and 2 to 6 kWh on the DELTA 2 Max. Anker states plainly that the C1000 Gen 2 has no expansion feature and points buyers who want it at the original C1000 instead.

Headline watts versus spec-table watts

One useful check before you buy: the retail listing and the spec table do not always print the same number. EcoFlow's own spec table lists the RIVER 3 Plus at 600 W total with a 1,200 W surge and a 1,200 W X-Boost figure, while the retail listing headlines 760 W. The DELTA 3 Plus is 1,800 W in the spec table and 2,200 W with X-Boost. X-Boost is a software mode that reshapes output to run certain resistive loads, not extra inverter hardware, so we print the hardware rating and leave the boost figure as a footnote. Size against the spec table.

Balcony solar: legal status is still moving

Charging a power station from a portable solar panel is uncomplicated, because the panel connects to the unit's DC input and never touches the building. Plug-in solar that feeds the apartment's outlets is the contested version, and the rules are being written now.

Utah's H.B. 340, passed in 2025, is the clearest statute we found. It defines a portable solar generation device as one with a maximum power output of not more than 1,200 watts, designed to connect through a standard 120-volt outlet, meeting the current National Electrical Code and certified by Underwriters Laboratories or an equivalent body, and it exempts such a device from interconnection agreement requirements. The same statute also requires the device to include a feature that prevents it from energizing the building's electrical system during a power outage. Read that last clause carefully: under Utah's own rules, a plug-in solar device is a bill-offset product, not a backup product. Other states are at different stages and some have no framework at all, so treat this as a live area, check your own state, and check your lease separately. For backup purposes, a panel that charges the power station directly sidesteps the whole question.

The honest limits

A power station is not a home battery. It will not carry a whole apartment, it cannot touch a 240V appliance, it cannot feed a hardwired circuit, and a multi-day outage will empty it unless you have a way to refill it. Prices on these products move often, which is one reason we publish none here. Every figure above is a manufacturer datasheet claim recorded with its published basis, not a measurement we made. If you are weighing this path against an installed system for a home you own or plan to own, the portable versus home battery comparison is the right next read, and the complete backup guide covers the installed side.