DEVICE 1
Source: Portable Power Match planning methodologyCurated editable planning estimate using a 50% cycling duty cycle. The 300 W startup value is a conservative 3× compressor-start allowance; verify the appliance nameplate.
Sizing calculator
How much backup power do you need?
Choose your devices, a backup window, and what you are planning for. Advanced electrical controls are optional.
POWER NEEDS
Example planning values — edit them to match your actual devices.
DEVICE 2
Source: ENERGY STAR certified light-fixture listingExample certified LED fixture value; edit this to match the wattage printed on each lamp.
DEVICE 3
Source: Apple 20W USB-C Power Adapter specificationsUses a maximum adapter output as a conservative planning value; actual charging draw usually varies over the charge cycle.
LOAD SUMMARY
- Devices selected
- 4
- Estimated energy
- 535 Wh
- After conversion losses
- 630 Wh
- Recommended rated capacity
- ~742 Wh+
- Maximum simultaneous load
- 139 W
- Startup / surge requirement
- 339 W
Energy uses each row’s runtime, quantity, and duty cycle. Output sums checked devices; unchecked devices are treated as one-at-a-time loads. Startup replaces that device’s running draw during its start event.
YOUR ESTIMATED NEED
Battery size
~0.74 kWh+
Power output
~139 W+
Startup capability
~339 W
See calculation details
- Device energy
- 535 Wh
- After 85% conversion efficiency
- 630 Wh
- After separate 15% reserve
- 742 Wh
RECOMMENDED MATCHES
How scoring works1
BLUETTI Elite 100 V2
1,024 Wh · 1,800 W · 25.3 lb
Match Score 85 / 100
Why this matches
- Meets your 139 W continuous running requirement.
- Battery capacity is closely sized to your requested runtime.
- Its surge rating covers your estimated 339 W startup requirement.
- Weighs 25.3 lb for transport.
Trade-off: Its battery capacity cannot be expanded later.
Score breakdown
Capacity Fit 96Output Fit 60Use-case Fit 88Portability 79Feature Fit 87
Check Price on Amazon.comExact product listing at Amazon US — availability may change
Check price at manufacturer · BLUETTI USExact product listing at BLUETTI US — availability may change
2
EcoFlow DELTA 3 Plus
1,024 Wh · 1,800 W · 27.6 lb
Match Score 85 / 100
Why this matches
- Meets your 139 W continuous running requirement.
- Battery capacity is closely sized to your requested runtime.
- Its surge rating covers your estimated 339 W startup requirement.
- Weighs 27.6 lb for transport.
Trade-off: It weighs 27.6 lb, so lighter eligible options may be easier to move.
Score breakdown
Capacity Fit 96Output Fit 60Use-case Fit 86Portability 75Feature Fit 91
Check price at manufacturer · EcoFlow USExact product listing at EcoFlow US — availability may change
Check Price on Amazon.comExact product listing at Amazon US — availability may change
3
BLUETTI AC70
768 Wh · 1,000 W · 22.5 lb
Match Score 83 / 100
Why this matches
- Meets your 139 W continuous running requirement.
- Battery capacity is closely sized to your requested runtime.
- Its surge rating covers your estimated 339 W startup requirement.
- Weighs 22.5 lb for transport.
Trade-off: Its battery capacity cannot be expanded later.
Score breakdown
Capacity Fit 100Output Fit 60Use-case Fit 69Portability 85Feature Fit 73
Search AmazonSearch results — exact listing not verified
Check price at manufacturer · BLUETTI USExact product listing at BLUETTI US — availability may change