Home Backup Power Calculator

List your essential home loads with their watts, quantity and hours/day, mark which ones can run at the same time, set your outage length and any solar recharge, and the calculator shows the capacity and output you need — plus which catalog products meet 240V, TT-30/transfer, or UPS-style requirements you flag as required.

Homeowners and renters planning battery backup for essential circuits during a grid outage — from a short blackout to a multi-day event with partial solar recharge.

Load	Power (W)	Qty	Hrs/day	Surge (W)optional	Coincides?with others	Wh/day	Remove
						1,200
						240
						432

Uncheck “Coincides?” for a load you know never runs at the same time as the others (it still counts fully toward daily energy, just not toward the simultaneous continuous/surge power requirement).

Days of outage (no recharge)1 dayDaily solar recharge (Wh, optional)Leave at 0 if you have no solar recharge. This is a planning estimate of your panel’s realistic daily output, not a guarantee of sun.

Calculation assumptions

Usable efficiency: 85%

Assumed usable share of nameplate capacity after inverter and conversion losses.

Reserve headroom: 20%

Extra capacity kept in reserve above the calculated requirement.

Hard requirements & preferences

I need native 120/240V outputI need fast automatic transfer / UPS-style switchoverI need to be able to add expansion batteries later

Recommended minimum capacity

2,643 Wh

= (1,872 Wh/day − 0 Wh/day solar × 1 day) ÷ 85% usable × (1 + 20% reserve)

Solar contributes an estimated 0 Wh/day, leaving a daily deficit of 1,872 Wh that the battery must supply. This is a planning estimate, not a guarantee of actual sun conditions.

Total daily energy: 1,872 Wh
Daily deficit after solar: 1,872 Wh
Required continuous output: 208 W
Required surge capability: 658 W

Why your real result may differ

These figures are planning estimates from the inputs and assumptions above — not a lab measurement. Your real result can vary with:

Temperature — cold reduces usable battery capacity; heat can trigger throttling
Battery age and condition — capacity fades gradually with cycles and time
Inverter efficiency — some energy is always lost converting DC to AC
Variable appliance draw — most appliances don't pull a constant wattage
Startup/surge power — a motor's brief startup spike can exceed its running watts
Appliance settings — e.g. humidifier, fan speed, or temperature setting
Conversion losses beyond the modeled efficiency assumption
Real solar conditions — actual panel output is usually well below its rated watts
The safety reserve is a margin for error, not a guarantee

How this is calculated

Recommended Power Stations

Compare your shortlist →

Every product in the catalog is classified against your requirement using the same engine as the Power Calculator: first compatibility (does it meet every hard requirement), then how proportionate it is to your need. Units that fail a hard requirement are shown as Not Suitable with the reason, rather than hidden — and units far larger than you need are labeled Oversized rather than presented as a top pick.

Illustrative image — not an exact product photograph.

BLUETTI

Elite 300

3,014.4 Wh · 2,400 W rated · 58 lb (26.3 kg)

Good Fit

≈1.1× your recommended minimum capacity

Great

Estimated days from this unit's own capacity: 1.4 days

Capacity 3,014 Wh covers your recommended minimum of 2,643 Wh.
Rated output 2,400 W handles your 208 W continuous load.
Surge rating 4,800 W covers the estimated 658 W startup spike.

Check Price on Amazon

Price, availability and current rating are shown on Amazon — PowerMatchLab does not display them because we have not independently verified them. As an Amazon Associate we may earn from qualifying purchases.

Illustrative image — not an exact product photograph.

Pecron

E3600LFP

3,072 Wh · 3,600 W rated · 79.4 lb (36 kg)

Good Fit

≈1.2× your recommended minimum capacity

Good

Estimated days from this unit's own capacity: 1.4 days

Capacity 3,072 Wh covers your recommended minimum of 2,643 Wh.
Rated output 3,600 W handles your 208 W continuous load.
Surge rating 7,000 W covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

BLUETTI

Apex 300

2,764.8 Wh · 3,840 W rated

Good Fit

≈1.0× your recommended minimum capacity

Good

Estimated days from this unit's own capacity: 1.3 days

Capacity 2,765 Wh covers your recommended minimum of 2,643 Wh.
Rated output 3,840 W handles your 208 W continuous load.
Surge rating 7,680 W covers the estimated 658 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

DELTA Pro 3

4,096 Wh · 4,000 W rated

Good Fit

≈1.5× your recommended minimum capacity

Great

Estimated days from this unit's own capacity: 1.9 days

Capacity 4,096 Wh covers your recommended minimum of 2,643 Wh.
Rated output 4,000 W handles your 208 W continuous load.
Surge rating 8,000 W covers the estimated 658 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

F3000

3,072 Wh · 3,600 W rated · 91.5 lb (41.5 kg)

Good Fit

≈1.2× your recommended minimum capacity

Good

Estimated days from this unit's own capacity: 1.4 days

Capacity 3,072 Wh covers your recommended minimum of 2,643 Wh.
Rated output 3,600 W handles your 208 W continuous load.
Surge rating 7,200 W covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Mango Power

E

3,500 Wh · 3,000 W rated · 100.1 lb (45.4 kg)

Good Fit

≈1.3× your recommended minimum capacity

Good

Estimated days from this unit's own capacity: 1.6 days

Capacity 3,500 Wh covers your recommended minimum of 2,643 Wh.
Rated output 3,000 W handles your 208 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Growatt

HELIOS 3600

3,686.4 Wh · 3,600 W rated

Good Fit

≈1.4× your recommended minimum capacity

Good

Estimated days from this unit's own capacity: 1.7 days

Capacity 3,686 Wh covers your recommended minimum of 2,643 Wh.
Rated output 3,600 W handles your 208 W continuous load.

Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Oversized alternatives — larger than you need (2)

These fully meet your requirement but carry much more capacity or output than your calculation needs. They can still make sense for future growth, but they are not the proportionate pick.

Illustrative image — not an exact product photograph.

Anker SOLIX

F3800

3,840 Wh · 6,000 W rated · 132.3 lb (60 kg)

Oversized

≈1.5× your recommended minimum — much more than needed

Good

Estimated days from this unit's own capacity: 1.7 days

Capacity 3,840 Wh covers your recommended minimum of 2,643 Wh.
Rated output 6,000 W handles your 208 W continuous load.
Surge rating 9,000 W covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

EcoFlow

DELTA Pro Ultra

6,144 Wh · 7,200 W rated

Oversized

≈2.3× your recommended minimum — much more than needed

Excellent

Estimated days from this unit's own capacity: 2.8 days

Capacity 6,144 Wh covers your recommended minimum of 2,643 Wh.
Rated output 7,200 W handles your 208 W continuous load.
Surge rating 10,800 W covers the estimated 658 W startup spike.

Check Price on Amazon

Possible matches (2)

Independent editorial illustration — not an official product photo.

Jackery

Explorer 5000 Plus

5,040 Wh · Not verified rated · 134 lb (60.8 kg)

Possible Match

Great

Estimated days from this unit's own capacity: 2.3 days

Capacity 5,040 Wh covers your recommended minimum of 2,643 Wh.

Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Amazon option includes an Anderson extension cable

Independent editorial illustration — not an official product photo.

Jackery

Explorer 3000 v2

3,072 Wh · Not verified rated · 59.5 lb (27 kg)

Possible Match

Not scored

Estimated days from this unit's own capacity: 1.4 days

Capacity 3,072 Wh covers your recommended minimum of 2,643 Wh.

Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Not suitable for this requirement (28)

Independent editorial illustration — not an official product photo.

BLUETTI

AC70

768 Wh · 1,000 W rated · 22.5 lb (10.2 kg)

Not Suitable

Fair

Rated output 1,000 W handles your 208 W continuous load.
Surge rating 2,000 W covers the estimated 658 W startup spike.

Capacity 768 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Jackery

Explorer 1000 V2

1,070 Wh · 1,500 W rated · 23.8 lb (10.8 kg)

Not Suitable

Fair

Rated output 1,500 W handles your 208 W continuous load.
Surge rating 3,000 W covers the estimated 658 W startup spike.

Capacity 1,070 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

DELTA 3 Classic

1,024 Wh · 1,800 W rated · 26.7 lb (12.1 kg)

Not Suitable

Fair

Rated output 1,800 W handles your 208 W continuous load.
Surge rating 3,600 W covers the estimated 658 W startup spike.

Capacity 1,024 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

RIVER 2 Pro

768 Wh · 800 W rated · 18.2 lb (8.3 kg)

Not Suitable

Fair

Rated output 800 W handles your 208 W continuous load.
Surge rating 1,600 W covers the estimated 658 W startup spike.

Capacity 768 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

VTOMAN

FlashSpeed 1000

828 Wh · 1,000 W rated · 37.4 lb (17 kg)

Not Suitable

Fair

Rated output 1,000 W handles your 208 W continuous load.
Surge rating 2,000 W covers the estimated 658 W startup spike.

Capacity 828 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

BLUETTI

Elite 100 V2

1,024 Wh · 1,800 W rated · 25.4 lb (11.5 kg)

Not Suitable

Fair

Rated output 1,800 W handles your 208 W continuous load.
Surge rating 3,600 W covers the estimated 658 W startup spike.

Capacity 1,024 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

EcoFlow

DELTA 3 Plus

1,024 Wh · 1,800 W rated

Not Suitable

Fair

Rated output 1,800 W handles your 208 W continuous load.
Surge rating 3,600 W covers the estimated 658 W startup spike.

Capacity 1,024 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

C1000 Gen 2

1,024 Wh · 2,000 W rated

Not Suitable

Fair

Rated output 2,000 W handles your 208 W continuous load.
Surge rating 3,000 W covers the estimated 658 W startup spike.

Capacity 1,024 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Jackery

Explorer 2000 V2

2,042 Wh · 2,200 W rated · 39.5 lb (17.9 kg)

Not Suitable

Good

Rated output 2,200 W handles your 208 W continuous load.
Surge rating 4,400 W covers the estimated 658 W startup spike.

Capacity 2,042 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

C2000 Gen 2

2,048 Wh · 2,400 W rated · 41.7 lb (18.9 kg)

Not Suitable

Good

Rated output 2,400 W handles your 208 W continuous load.
Surge rating 4,000 W covers the estimated 658 W startup spike.

Capacity 2,048 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

EcoFlow

DELTA 2 Max

2,048 Wh · 2,400 W rated · 50.7 lb (23 kg)

Not Suitable

Good

Rated output 2,400 W handles your 208 W continuous load.
Surge rating 4,800 W covers the estimated 658 W startup spike.

Capacity 2,048 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Pecron

E2400LFP

2,048 Wh · 2,400 W rated · 45.2 lb (20.5 kg)

Not Suitable

Good

Rated output 2,400 W handles your 208 W continuous load.
Surge rating 4,000 W covers the estimated 658 W startup spike.

Capacity 2,048 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

EcoFlow

RIVER 3 Plus

286 Wh · 600 W rated · 10.4 lb (4.7 kg)

Not Suitable

Fair

Rated output 600 W handles your 208 W continuous load.
Surge rating 1,200 W covers the estimated 658 W startup spike.

Capacity 286 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Segway

Cube 1000

1,024 Wh · 2,200 W rated · 35.7 lb (16.2 kg)

Not Suitable

Fair

Rated output 2,200 W handles your 208 W continuous load.
Surge rating 4,400 W covers the estimated 658 W startup spike.

Capacity 1,024 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

AC200L

2,048 Wh · 2,400 W rated · 62.4 lb (28.3 kg)

Not Suitable

Fair

Rated output 2,400 W handles your 208 W continuous load.
Surge rating 3,600 W covers the estimated 658 W startup spike.

Capacity 2,048 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

S2000

2,010 Wh · 1,500 W rated · 35.7 lb (16.2 kg)

Not Suitable

Good

Rated output 1,500 W handles your 208 W continuous load.

Capacity 2,010 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Jackery

Explorer 2000 Plus

2,042.8 Wh · 3,000 W rated · 61.5 lb (27.9 kg)

Not Suitable

Good

Rated output 3,000 W handles your 208 W continuous load.
Surge rating 6,000 W covers the estimated 658 W startup spike.

Capacity 2,043 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

AC180

1,152 Wh · 1,800 W rated · 35.3 lb (16 kg)

Not Suitable

Fair

Rated output 1,800 W handles your 208 W continuous load.

Capacity 1,152 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Goal Zero

Yeti 700

677 Wh · 600 W rated

Not Suitable

Not scored

Rated output 600 W handles your 208 W continuous load.
Surge rating 1,000 W covers the estimated 658 W startup spike.

Capacity 677 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Anker SOLIX

C800X

768 Wh · 1,200 W rated

Not Suitable

Not scored

Rated output 1,200 W handles your 208 W continuous load.
Surge rating 1,600 W covers the estimated 658 W startup spike.

Capacity 768 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Amazon bundle includes a 100W solar panel.

Independent editorial illustration of the DJI Power 500 — not an official manufacturer photograph.

Independent editorial illustration — not an official product photo.

DJI

Power 500

512 Wh · 1,000 W rated · 16.1 lb (7.3 kg)

Not Suitable

Fair

Rated output 1,000 W handles your 208 W continuous load.

Capacity 512 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Illustrative image — not an exact product photograph.

BLUETTI

Elite 30 V2

288 Wh · 600 W rated · 9.5 lb (4.3 kg)

Not Suitable

Limited

Rated output 600 W handles your 208 W continuous load.

Capacity 288 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Goal Zero

Yeti 1500 (6th Gen)

1,505 Wh · 2,000 W rated

Not Suitable

Not scored

Rated output 2,000 W handles your 208 W continuous load.
Surge rating 3,600 W covers the estimated 658 W startup spike.

Capacity 1,505 Wh is below the 2,202 Wh of usable energy your devices need.

Check Price on Amazon

Independent editorial illustration of the DJI Power 2000 — not an official manufacturer photograph.

Independent editorial illustration — not an official product photo.

DJI

Power 2000

2,048 Wh · 3,000 W rated

Not Suitable

Fair

Rated output 3,000 W handles your 208 W continuous load.

Capacity 2,048 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Jackery

Explorer 300 Plus

288 Wh · 300 W rated · 8.3 lb (3.8 kg)

Not Suitable

Fair

Rated output 300 W handles your 208 W continuous load.

Capacity 288 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating 600 W may not cover the estimated 658 W startup spike from motor-driven devices.

Check Price on Amazon

Illustrative image — not an exact product photograph.

Anker SOLIX

C300

288 Wh · 300 W rated

Not Suitable

Not scored

Rated output 300 W handles your 208 W continuous load.

Capacity 288 Wh is below the 2,202 Wh of usable energy your devices need.
Surge rating 600 W may not cover the estimated 658 W startup spike from motor-driven devices.

Check Price on Amazon

Independent editorial illustration of the DJI Power 1000 V2 — not an official manufacturer photograph.

Independent editorial illustration — not an official product photo.

DJI

Power 1000 V2

1,024 Wh · Not verified rated · 31.3 lb (14.2 kg)

Not Suitable

Fair

Capacity 1,024 Wh is below the 2,202 Wh of usable energy your devices need.
Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Independent editorial illustration — not an official product photo.

Jackery

Explorer 500 v2

512 Wh · Not verified rated · 12.6 lb (5.7 kg)

Not Suitable

Not scored

Capacity 512 Wh is below the 2,202 Wh of usable energy your devices need.
Rated continuous output is not verified for this unit.
Surge rating is not verified, so we cannot confirm it covers the estimated 658 W startup spike.

Check Price on Amazon

Why these results?

Recommendations are deterministic: your required continuous output, capacity (with reserve) and estimated surge are compared against each unit’s manufacturer-published specs, then your stated hard requirements are applied. Nothing here is sponsored, and no score is invented to rank a product.

Formula

Daily energy (Wh) = Σ (device watts × quantity × hours/day) for every load. Daily deficit after solar = max(0, daily energy − daily solar Wh). Recommended minimum capacity (Wh) = (daily deficit × days) ÷ usable efficiency × (1 + reserve fraction). Required continuous output = sum of loads marked as coinciding; required surge = that sum plus the largest single startup spike.

Which loads can coincide, and why it matters

A refrigerator, router and a few lights might run continuously together, while a sump pump only kicks on occasionally and a space heater might never run at the same time as the microwave. Mark a load as not coinciding when you're confident it never overlaps with the rest — it still counts fully toward total daily energy, just not toward the instantaneous continuous/surge requirement, which can meaningfully lower the output rating you actually need.

Whole-home or panel-level backup needs an electrician

This calculator sizes a standalone power station running extension cords or a few plugged-in devices. If you're considering wiring a power station into your home's electrical panel, a transfer switch, or anything touching 240V household circuits, that work requires a licensed electrician and must meet local electrical code — this tool does not verify wiring safety or code compliance, and none of its output should be treated as electrical installation guidance.

UPS-style fast transfer: what "unverified" means here

Some power stations advertise a fast automatic transfer time (measured in milliseconds) suitable for sensitive electronics that can't tolerate even a brief power gap. There's no single industry-wide "fast enough" threshold this calculator can apply — when you flag this requirement, it simply shows each product's manufacturer-published transfer time (or flags it as not verified) so you can judge it against your own equipment's tolerance.

Common mistakes

Marking every load as coinciding by default, which can inflate the required continuous/surge output well beyond what's realistic.
Sizing for capacity (Wh) but overlooking the continuous output (W) needed to actually run the loads at once.
Assuming any power station output is safe to backfeed into household wiring without a transfer switch and an electrician.
Treating an unverified 240V, TT-30, or UPS transfer-time field as a "probably fine" — an unknown field is never the same as a confirmed capability.

Related guides

FAQ

Can I just plug a power station into a wall outlet to power my house?

No — backfeeding power into household wiring without a proper transfer switch is a serious safety hazard, both for you and for utility workers. This calculator is for a standalone unit running extension cords or directly plugged-in devices, or a professionally installed transfer setup — always involve a licensed electrician for anything connecting to household circuits.

What does it mean if a product is 'Not Suitable' for my 240V requirement?

It means that product does not have verified native 120/240V split-phase output, which you marked as required. It isn't hidden — the reason is shown so you can see exactly why it didn't qualify.

How is this different from the general Power Calculator?

It uses the exact same underlying formulas, with home-backup-specific presets (fridge, freezer, sump pump, CPAP, router) and home-specific hard requirements (240V, TT-30/transfer, UPS-style switchover) surfaced up front, plus a per-load "coincides with others" toggle the general calculator doesn't expose.

Sources

PowerMatchLab's own Power Calculator methodology (same formulas, see About & Methodology)

Last updated September 11, 2026. This tool performs calculations from the numbers you enter — it does not measure, test or guarantee real-world performance. See About & Methodology.