Guide

Home backup power for a grid under new pressure

What rising electricity demand means for outage exposure at your meter — and how to size a battery backup that actually covers your loads.

The grid is being asked to do more

For roughly two decades, U.S. electricity demand barely moved. That era is over. Federal EIA short-term outlooks now project record national consumption, driven by three overlapping forces: the data center buildout, the electrification of heating and transport, and industrial reshoring.

The data center wave is the piece we track most closely on this site. Our dataset currently covers 153 data center campuses totaling roughly 51,000 MW of capacity — and across all project types, 516 projects representing about 95,000 MW are still in the pipeline (under construction, planned, or announced). A single hyperscale AI campus can draw as much power as a mid-sized city, and utilities are being asked to interconnect dozens of them on timelines the grid wasn't planned around. You can see where this is landing on the map.

Reliability planners have taken notice. NERC's recent long-term reliability assessments flag a growing share of North America at elevated risk of electricity shortfalls during extreme conditions, with demand growth outpacing the pace of new firm supply in several regions.

What that means at your meter

Some honesty first: a data center three counties away does not cause the outage on your street. Most outages remain local distribution events — storms, vegetation, equipment failure. But the household outage math is shifting in three ways:

• Tighter reserve margins. When regional demand grows faster than firm supply, grid operators lean more often on emergency measures during heat waves and cold snaps — including, in the worst case, rolling outages.
• More stress on aging infrastructure. Load growth pushes more power through transmission and distribution equipment that in much of the country is decades old, while extreme weather events keep testing it.
• Higher stakes per outage. Electrified households feel outages harder. If your heat is a heat pump, your car is an EV, your job is remote, or someone in the house depends on powered medical equipment, the cost of a dark day has gone up even if outage frequency hasn't.

Sizing backup: the two numbers that matter

Backup sizing comes down to two figures, and confusing them is the most common mistake:

• Power (watts) — how much the system can deliver at once. This must cover everything you want running simultaneously, including motor start-up surges. It sizes the inverter.
• Energy (watt-hours) — how long it can keep delivering. This sizes the battery.

Typical household loads, for orientation:

Add up what must run at the same time — that's your minimum inverter wattage. Multiply your average combined draw by the hours you want to ride through — that's your minimum battery capacity. One warning that saves a lot of disappointment: resistive heating loads (space heaters, electric ranges, electric water heaters) draw 1,000–5,000 W continuously and will drain any battery quickly. Plan around them, not through them.

The base unit: Jackery Explorer 5000 Plus

This guide is built around the Jackery Explorer 5000 Plus because its spec sheet lines up unusually well with the whole-home problem: enough surge and continuous power to start real appliances, 240 V output for the loads that need it, and a modular battery architecture that separates "how much power" from "how long."

Reading the specs against the table above:

• 7,200 W of AC output covers a refrigerator, furnace blower, sump pump, lights, and electronics running together, with headroom for compressor and pump start-up surges that smaller stations can't absorb.
• 240 V output is the dividing line between "extension-cord backup" and "runs the well pump." Most portable power stations are 120 V only; this one delivers split-phase 240 V, which is what well pumps and other double-pole loads in a U.S. panel require.
• LiFePO4 chemistry trades some weight against the NMC cells in older portable stations in exchange for substantially longer cycle life and better thermal stability — relevant properties for a unit that spends most of its life sitting at high charge waiting for an outage.
• 5,040 Wh of energy is the honest constraint. A refrigerator averaging 150 W runs about 33 hours on paper; add a cycling furnace blower and communications and a realistic winter essentials load of ~450 W runs about 11 hours, before inverter losses (real-world figures land 10–15% lower). The base unit rides through a serious overnight outage. Multi-day events are what the expansion path below is for.

Jackery Explorer 5000 Plus on Amazon →

The expansion path: from 5 kWh toward whole-home

The reason to pick a modular system over a sealed all-in-one is that you can buy the inverter once and grow the energy to match your actual outages. The Jackery Battery Pack 5000 Plus is the expansion unit: each pack adds 5,040 Wh to the same system, no additional inverter or wiring, scaling the Explorer 5000 Plus from its base 5 kWh up to 60 kWh.

For scale: the average U.S. home consumes around 30 kWh per day. A fully expanded 60 kWh system is therefore roughly two days of normal, unrestricted consumption — or considerably longer running essentials only. Somewhere between one and three packs, a battery stops being an emergency bridge and starts being genuine whole-home backup.

A sensible sequence: run the base unit through one real outage (or a deliberate weekend test with the main breaker off), meter what your essential loads actually draw, then add packs to cover the outage duration you're planning for — a number worth choosing deliberately if your region shows up in the elevated-risk sections of NERC's assessments.

Jackery Battery Pack 5000 Plus on Amazon →

Jackery also sells the Explorer 5000 Plus bundled with a transfer switch for 240 V whole-home cutover — the configuration where the system is wired to your electrical panel and takes over selected circuits automatically. If you want panel-integrated backup rather than extension cords, that bundle plus a licensed electrician is the path to discuss.

Where this fits — and where it doesn't

These aren't mutually exclusive — a battery system pairs naturally with either of the others as the instant-on, indoor-safe layer.

The bigger picture

Backup power is the household-scale answer to the same question this site tracks at grid scale: how do you keep the lights on while demand outruns the pace of new supply? The utility-scale version of that answer — over 1,400 battery storage sites, 122,000 MW of projects, growing monthly — is on the map.

See what's being built near you →