What battery for a power outage — Guide and autonomy table

How to calculate what you need

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The formula

Sum watts (W) of appliances you want to keep on × desired hours = minimum Wh needed. Add 20% safety margin.

Example: router (12W) + 2 cameras (20W) + laptop (55W) + lights (30W) = 117W × 8h = 936 Wh + 20% = at least 1,120 Wh.

Appliance	Consumption	500 Wh	1,000 Wh	2,000 Wh
WiFi router	10–15W	33–50h	66–100h	133–200h
IP camera	5–15W	33–100h	66–200h	—
Laptop	45–65W	7–11h	15–22h	30–44h
43" LED TV	80–120W	4–6h	8–12h	16–25h
LED lights ×5	25–40W	12–20h	25–40h	—
Fridge A++	80–150W	3–6h	6–12h	13–25h
Microwave	800–1,000W	30–37 min	1h	2h

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Water tap analogy

W = how fast water flows (instantaneous power). Wh = total tank capacity (stored energy). 1,000 Wh delivers 1,000W for 1h, or 100W for 10h.

Brand	Model	Capacity	Tech	Charge	Price
EcoFlow	DELTA 2	1,024 Wh	LFP	80% in 50 min	~€700
BLUETTI	AC180	1,152 Wh	LFP	80% in 45 min	~€800
Jackery	Explorer 1000 Pro	1,002 Wh	NMC	80% in 1h	~€650
Anker SOLIX	C1000	1,056 Wh	LFP	80% in 58 min	~€600

Yes, with at least 1,000W continuous output. Check peak power for the compressor startup surge (2,000–3,000W for 1–2 sec).

LiFePO4: 3,000–3,500 cycles at 80% capacity. Charging weekly = 60+ years theoretically. 15–20 years of real use easily achievable.