Cost to Back Up Your House With a Power Station

The number on the box is not the cost to back up your house. Neither is the sum of your appliances times the hours you want to run them. Two things break that math before you even start: the station burns power just sitting there turned on, and you never actually get the full capacity printed on the label. Miss either one and a multi-day outage drains your battery well before your plan said it would.

This guide works through what backup power actually costs — in dollars, in capacity, and in the gap between what a spec sheet promises and what hands-on testing delivers.

What Your House Actually Needs in an Outage

The honest answer is: it depends more on your heating and cooling situation than on almost anything else. One seller-adjacent source models a deliberately minimal essentials scenario — fridge, a few LED lights, phone charging, a CPAP machine, and the blower motor on a gas furnace — and arrives at roughly 5,200 Wh per day. In that model, the furnace blower alone accounts for an estimated 2,700 Wh of that total, and the fridge another estimated 1,300 Wh.

Take that 5,200 Wh figure as a floor for a stripped-down setup, not a typical house. It was built from assumed duty cycles, not measurements, and it quietly excludes the loads that dominate most homes:

• Electric heat or a heat pump (many times the draw of a gas furnace blower)
• Central air conditioning
• A well pump
• Electric water heating or an electric range

If your home has any of those, copying this number will leave you badly undersized. A house running on a heat pump in winter, for instance, isn’t a rounding error above that estimate — it’s a completely different order of magnitude. The only honest starting point is your own appliance list, not someone else’s essentials scenario.

Why the Math Always Comes Up Short

Even if you nail your daily load estimate, two corrections push the capacity you actually need above that number — and the further into a multi-day outage you go, the bigger the gap becomes.

The station is drawing power whether or not you’re using it

A powered-on station doesn’t just sit idle. Testing and seller documentation both show that units draw somewhere in the range of 37–42W continuously just to stay on. At 42W, that’s roughly 1,000 Wh per day per unit — gone before a single appliance is connected. If you’re running multiple units in parallel (one published figure for a multi-unit setup came to about 1,800 Wh/day in idle drain alone), this compounds fast.

A two-day outage doesn’t just double your load math. It doubles your load math plus adds two days of idle draw on top. The multi-day capacity figures you’ll find on most spec sheets explicitly exclude this — they’re load math only. That omission is where most budgets fall apart.

You don’t get the full nameplate capacity

Hands-on testers who actually measure output — rather than repeat what’s on the box — find that real delivered capacity runs in the 90–97% range of what the label says. That’s not a disaster, but it means the 5,000 Wh unit you’re counting on for a 5,200 Wh/day plan is already short before idle drain enters the picture. Size around measured throughput, not the spec sheet number.

The practical upshot: for any multi-day plan, your nameplate capacity needs to meaningfully exceed your load math. The exact margin depends on your specific loads and how many days you’re planning for — but a system sized right at your estimated daily consumption will fall short of even one full day.

What Tested Runtimes Look Like

The most concrete data in this entire topic comes from labs that actually plug a fridge in and time it. That’s where the abstract capacity discussion gets real.

A roughly 1,000 Wh station (the Jackery Explorer 1000 V2) ran a 25-cubic-foot refrigerator for 18 hours and 22 minutes in testing. A small 268 Wh unit (the EcoFlow River 3 Plus) ran a fridge for 3 hours and 45 minutes. The pattern holds across the range — usable capacity and fridge runtime scale roughly together, and the fridge is one of your more efficient sustained loads.

What the runtime numbers won’t tell you is whether the station can start the fridge in the first place. Compressor motors draw two to three times their running wattage for a fraction of a second at startup. A station with plenty of stored energy but a weak surge ceiling may refuse to turn the compressor over at all. That’s a separate spec from capacity — and it’s where people get surprised.

Inverter Output: Running Watts vs. Startup Surge

Every station has two output numbers: continuous rated watts and momentary surge capacity. Both matter; surge is what trips people up.

For running multiple home appliances simultaneously, a rough rule of thumb from one source puts the threshold around 3,000W continuous. Real units vary widely:

• Jackery Explorer 1000 V2: 1,500W continuous, 3,000W surge
• EcoFlow Delta Pro 3: 4,000W continuous, 6,000W peak
• Bluetti Apex 300: 3,840W continuous, 7,680W surge

The 3,000W continuous recommendation is a single-source heuristic, not a universal law — your own appliance mix determines what you need. But the underlying framework is solid: check both numbers, not just continuous watts. A fridge, a sump pump, and a furnace blower all drawing startup current within seconds of each other can spike past a station’s surge ceiling even if the running wattage fits comfortably. The surges don’t politely take turns.

What a Real System Costs

All pricing here comes from a single seller-adjacent source and is tied to specific bundle promotions and discount codes. Treat these as order-of-magnitude reference points, not current prices — discounts expire, bundles change, and there is no independent cross-check for these figures.

With that caveat clearly stated, the rough shape of the market looks like this:

The wide spread in the three-day column reflects two genuinely different hardware approaches — a portable stacked battery system versus a fixed inverter paired with wall-mounted batteries — not a pricing discrepancy. They’re different products solving the same problem at different installation levels.

What none of these prices include:

• Solar panels for recharging
• A transfer switch or interlock kit
• Electrician fees for any hardwired installation
• The additional batteries you’d need if your actual daily load exceeds the minimal essentials scenario the sizing was built around

That last point matters: the three-day capacity figures were sized to the ~5,200 Wh/day essentials-only estimate. If your real loads are higher — and they likely are if you have a well pump, electric heat, or an older fridge — you need more batteries, and the cost goes up accordingly.

There’s also a less obvious issue with the “three-day system” framing. Without solar recharge capability, a power station is a one-shot battery. It covers the outage duration it was sized for and then it’s empty. An extended outage with no grid and no panels doesn’t give you a three-day system — it gives you a battery that’s flat by day three with no way to refill it. Solar recharge is what turns a large battery into an ongoing backup.

How Long the Battery Lasts — Years, Not Days

LiFePO4 chemistry stations are commonly rated at around 6,000 cycles before capacity drops to 80% of original. For one specific unit, that figure appears in published documentation, and it implies a multi-year to decade-plus service life under typical use.

Read that number carefully. “To 80% capacity” is doing real work in that sentence — the battery doesn’t fail at the cycle count, it degrades continuously from day one. After 6,000 cycles it still works, just with less capacity. And no reviewer can actually verify a 6,000-cycle rating within any real test window; it’s a manufacturer claim with a defined endpoint, not a measured result. Temperature, depth of discharge, and storage habits all affect real calendar life in ways the cycle number doesn’t capture.

The Real Cost Is Capacity Times Days Times Honesty

The sticker price is just the beginning. The genuine cost of backing up your house is the sticker price of enough nameplate capacity to cover your real daily loads — not a stripped-down essentials estimate — plus idle drain for every day of the outage, plus solar recharge gear, plus any installation work, all sized to what your specific home actually draws. Run that math first, then price the hardware. Anyone who starts with the hardware price and works backward is budgeting for a different house than the one they live in.