Blackout Sizer Calculator
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Backup power: House with gas boiler, 24 h

Heating is the priority: the boiler and pump need little energy but a clean sine wave and correct wiring (bypass switch).

What is included

WhWh
Gas boiler (pump + controls)120241440
Heating circulation pump4524864
Refrigerator (with freezer)120241008
Wi-Fi router + modem/ONU1224288
LED lighting (5 bulbs)406240
Smartphone charging15230

Your numbers

Energy per outage
3870 Wh
3870 Wh per day
Peak power
832 W
352 W
Battery needed
5864 Wh
Solar to recharge daily (winter)
2580 W

Three setups

Minimum

Covers critical appliances only
EcoFlow DELTA Pro Ultra
6144 Wh · 7200 W (10800 W peak)
→

Comfort

Everything you ticked, full outage
EcoFlow DELTA Pro Ultra
6144 Wh · 7200 W (10800 W peak)
→

Autonomy

Expandable system + solar or generator
EcoFlow DELTA Pro Ultra
6144 Wh · 7200 W (10800 W peak)
→

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