Phoenix spent the summer of 2023 under a record that still sounds unreal: 31 straight days at or above 110°F. Now picture the grid dropping out in the middle of that streak. Arizona doesn’t belong to a regional grid operator the way Texas leans on ERCOT or the Mid-Atlantic leans on PJM: APS, SRP, and Tucson Electric Power each run their own system on the Western grid, and a monsoon haboob or microburst can knock a neighborhood offline in minutes. When that happens during a heat wave, the only question that matters about backup power is blunt: can it keep something cold running? If you’re already comparing Arizona solar quotes, note that a grid-tied rooftop array shuts off the instant the grid fails (anti-islanding safety rules), so panels alone won’t help mid-outage unless you pair them with storage.
That is the job home backup has to do. The three Jackery units below solve three different versions of the same problem, from keeping a Mesa fridge alive to running central AC in a Scottsdale house. Here’s how they compare.
| Model | HomePower 3000 | 3600 Plus | 5000 Plus |
|---|---|---|---|
| Capacity | ~3,072Wh | 3,584Wh | 5,040Wh |
| Output | 3,600W | 3,600W | 7,200W |
| Expandable to | Not expandable | 21kWh | 60kWh |
| Runs central AC | No | No (window AC yes) | Yes |
| 240V | No | No | Yes |
| Best for | Fridge + Wi-Fi + lights, 1–2 days | Essentials + a window AC | Whole home, central AC |
Reading the table for a Phoenix summer
The line that matters most here is “Runs central AC.” Only the Solar Generator 5000 Plus clears it: 5,040Wh of capacity, 7,200W of output, both 120V and 240V, and expandable to 60kWh. That’s the surge and split-phase voltage a central air handler and condenser need to start and keep running. For a larger north Phoenix or Scottsdale home where losing the AC in July isn’t survivable for an older resident or a pet, this is the unit to size around.
Solar Generator 5000 Plus (7,200W, 120V/240V): specs and price at Jackery
If you only need to keep one room livable, a bedroom cool enough to sleep through a monsoon-season outage, the HomePower 3600 Plus is the flexible middle. It offers 3,584Wh and 3,600W, expands to 21kWh, and ties into your home’s circuits through a transfer switch, so it can carry the essentials plus a window or portable AC without wiring in a whole-home system.
HomePower 3600 Plus (3,584Wh, expandable): specs and price at Jackery
And if the goal is simply to protect the fridge, Wi-Fi, lights, and a fan or two, the HomePower 3000 covers those essentials for one to two days and ships with solar panels that refill it in Arizona’s near-constant sun, so it keeps going even if APS or SRP takes longer than expected to restore. It can’t run central AC, but for a Tucson apartment or a smaller Chandler home it is the simplest of the three.
HomePower 3000 (panels included): current price at Jackery
What a Phoenix outage actually asks of a battery
Most backup guides are written for winter storms, where the load is a furnace blower of 400 to 600W. Phoenix flips that. The load that matters is air conditioning, which is the heaviest thing in a house, and the hours it matters most are the ones with no sun to spare: a power cut at 6 p.m. in July leaves the house at 95°F or more with the evening still ahead.
Outages here are usually short and sudden rather than long. A monsoon storm, a dust wall like the haboob that crossed the Valley in July 2011, or a heat-driven overload on one transformer takes out a neighbourhood for a few hours. The case for a battery is therefore less “survive a week” and more “keep one room liveable until dark, and keep the fridge cold overnight”. That is why the right unit depends on what you want cooled, not on how big your house is.
Which loads matter in a Phoenix summer
These are typical running draws. Your own appliances will differ, so treat the numbers as a planning range and check the label.
| Load | Running watts | Starts at | Daily energy |
|---|---|---|---|
| Refrigerator | 150W | 600 to 900W | 1,000 to 1,200Wh |
| Wi-Fi router and modem | 20W | n/a | 480Wh |
| Ceiling or box fan | 50 to 75W | n/a | 600 to 900Wh |
| Lights (LED) and phones | 50W | n/a | 300 to 400Wh |
| Window air conditioner, 10,000 BTU | 900W while running | 1,500 to 2,000W | about 5,000Wh over ten hours, cycling |
| Central AC, 3 ton | 3,000 to 4,000W | 6,000W or more | 35,000Wh or more over a hot day |
The first four rows together make roughly 2,100Wh a day, which is the “essentials” figure used below. Everything interesting happens in the last two rows.
How long each unit runs, battery only
All figures below ignore solar and assume a fully charged battery. The window unit is counted at an average of 500W over a night because the compressor cycles on and off; the central system is counted at 3,500W while the compressor is on.
| Scenario | HomePower 3000 (3,072Wh) | 3600 Plus (3,584Wh) | 5000 Plus (5,040Wh) |
|---|---|---|---|
| Essentials only (~2,100Wh a day) | about 35 hours | about 41 hours | about 58 hours |
| Essentials plus a bedroom window AC for ten hours (~7,100Wh a day) | about 10 hours of AC and essentials | about 12 hours | about 17 hours |
| Central AC running flat out (3,500W) | cannot start it | cannot run it (120V only) | about 1.4 hours |
| Central AC, cycling about 60% of the time, with 60kWh of expansion | not possible | not possible | about a day |
Three honest conclusions fall out of that table.
First, every unit handles the fridge, Wi-Fi, fans and lights for well over a day. For a Tucson apartment or a smaller Chandler home that is often all the planning you need.
Second, a bedroom window unit is the best value per watt-hour in the Valley. Cooling one room to sleep in costs a fraction of what cooling the whole house does, and the 3600 Plus handles it for a full night.
Third, central AC is a different purchase. The 5000 Plus is the only one of the three that can run it, but 5,040Wh is little more than an hour of flat-out running. Anyone who wants the whole house cooled for a day needs expansion batteries and a licensed electrician, and should price that as a project rather than a gadget.
What solar adds in Phoenix
The panels are the one real advantage Arizona has over almost anywhere else. A 400W panel set in clear July sun produces roughly 1,800 to 2,200Wh over the day after losses, enough to run the essentials and part of a night of window AC without touching the battery. In a summer outage that is the difference between a battery that runs flat at 2 a.m. and one that starts the next evening nearly full.
Two cautions. Panel output drops in the heat itself, and a dust haze after a haboob can cut it noticeably for a day or two. Treat solar as a top-up, charge the unit to full before storm season, and do not plan a central AC day on panels alone.
If you already have rooftop solar
A grid-tied rooftop system shuts itself off when the grid fails, as the opening of this page said. That surprises a lot of Phoenix homeowners who assumed their panels would keep the house cool during an outage. The two options are an inverter and battery system that can run the home on its own, which is a major installation, or a portable unit such as the ones above kept for the essentials. Our Arizona solar guide covers what the rooftop side costs, and the sizing guide shows how to work out your own daily watt-hours.
How to choose
- Fridge, Wi-Fi, fans and phones, one or two days: the HomePower 3000. It is the simplest and cheapest of the three and the panels refill it in the sun.
- Essentials plus one cooled room: the HomePower 3600 Plus. It carries a window unit through a night and expands to 21kWh when you want more.
- Central AC, a well pump, or any 240V load: the Solar Generator 5000 Plus, with expansion and an electrician.
For a deeper side-by-side of all three, including price per watt-hour, read the full 3000 vs 3600 Plus vs 5000 Plus comparison. If you are still deciding between brands, the Jackery, EcoFlow and Anker comparison covers that.
A short set-up checklist before July
- Charge the unit to full and leave it plugged in so it is ready when the lights flicker.
- Put it in the coolest room of the house. Batteries lose capacity when they sit in a hot garage, and a garage in August can pass 120°F.
- Run a test in June: plug in the fridge and a window unit for an hour and read the real watts on the display.
- Write the real numbers on a card taped to the unit, so anyone in the house can use it.
- Keep a window unit that fits one bedroom window, with its mounting kit, in the closet.
- Check on older neighbours early in a heat outage. A cooled room is worth sharing.
Before the next haboob
Monsoon storms arrive fast, and backup power can sell out just as quickly. Whichever of the three you choose, a unit that is charged and in a closet before the season is ready when the lights flicker. Prices change often, so compare current prices before deciding.
Current prices across the Jackery range
Keep reading: Arizona solar incentives & costs · Best solar generators for home backup (Nevada) · Best solar generators for home backup (New Mexico) · Can a solar generator run an air conditioner?