Portable Power Station Sizing: Fridge, Router, Lights — What Can You Actually Run?
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Quick answer: what size do you actually need?
Most people oversize or undersize their portable power station. The right size comes from what you actually need to run, for how long — not from marketing “peak watts” or “days of runtime” claims.
Simple rule: List your devices → multiply watts × hours → add 20% buffer → that is your minimum watt-hours (Wh).
Example: Fridge (100W × 8h) + Router (10W × 24h) + Phone (10W × 4h) + LED light (5W × 6h) = 800 + 240 + 40 + 30 = 1,110 Wh. Add 20% = 1,332 Wh minimum.
Why marketing numbers mislead
- “Peak watts” ≠ continuous watts. A 1000W peak station may only sustain 500W continuously.
- “Days of runtime” assumes tiny loads. “3 days” usually means a 5W LED only.
- Fridge duty cycle is not 100%. Compressor runs 30–50% of the time. But startup surge can be 3–5× running watts.
- Battery chemistry matters. LiFePO4 degrades slower than NMC lithium-ion, but costs more upfront.
Step 1: List what you actually need to run
Be honest. In a typical European apartment power cut, what matters?
| Device | Typical running watts | Typical hours/day | Wh/day | Startup surge |
|---|---|---|---|---|
| Fridge / freezer (compressor) | 80–150 W | 8–12 h (30–50% duty) | 640–1,800 | 500–700 W |
| Router / modem | 8–15 W | 24 h | 192–360 | — |
| Phone charging (USB-C PD) | 15–30 W | 2–4 h | 30–120 | — |
| Laptop (USB-C PD) | 45–65 W | 3–6 h | 135–390 | — |
| LED light (efficient) | 3–8 W | 4–6 h | 12–48 | — |
| Medical device (CPAP) | 30–60 W | 8 h | 240–480 | — |
| Small fan | 20–40 W | 4–8 h | 80–320 | — |
| TV (32–43″) | 30–60 W | 2–4 h | 60–240 | — |
| Portable heater ❌ | 500–2000 W | — | — | — |
| Kettle / microwave ❌ | 1000–2000 W | — | — | — |
❌ High-draw devices (heater, kettle, microwave, hair dryer, AC) are not practical on portable stations. Size for essentials only.
Step 2: Calculate your minimum Wh
Use this formula for each device:
Running watts × hours per day = Wh/day
Sum all Wh/day → multiply by days of autonomy (how many days without grid) → add 20% buffer for inverter loss, battery degradation, and surge.
Example scenarios
Scenario A: Apartment basics (1 person)
- Router (12W × 24h) = 288 Wh
- Phone (20W × 3h) = 60 Wh
- Laptop (60W × 4h) = 240 Wh
- LED light (5W × 5h) = 25 Wh
- Total/day: 593 Wh
- 2 days autonomy × 1.2 buffer = 1,420 Wh minimum
Recommended: 1,500–2,000 Wh station (e.g., EcoFlow River 2 Pro, Jackery Explorer 1000 v2)
Scenario B: Family apartment (2 adults, 1 child)
- Fridge (120W × 10h) = 1,200 Wh
- Router (12W × 24h) = 288 Wh
- 2 phones + 1 laptop = 300 Wh
- 2 LED lights (5W × 6h × 2) = 60 Wh
- Total/day: 1,840 Wh
- 2 days autonomy × 1.2 buffer = 4,416 Wh minimum
Recommended: 3,500–5,000 Wh station (e.g., EcoFlow Delta 2, Bluetti AC200P, Jackery Explorer 2000 Plus)
Scenario C: Medical + work from home (7-day target)
- CPAP (40W × 8h) = 320 Wh
- Fridge (120W × 10h) = 1,200 Wh
- Router + laptop + 2 phones = 600 Wh
- Lights + fan = 200 Wh
- Total/day: 2,320 Wh
- 3 days autonomy × 1.2 buffer = 8,352 Wh minimum
Recommended: 7,000–10,000 Wh expandable system (Bluetti AC300 + B300, EcoFlow Delta Pro + extra battery)
Step 3: Check surge capacity
Your station must handle the highest startup surge of any device you will run.
- Fridge compressor: 500–700 W surge
- CPAP: minimal surge
- Laptop/phone/router: negligible
Most 1,000 W continuous stations handle 1,800–2,000 W surge — enough for one fridge. Check the spec sheet for “surge watts” or “peak watts.”
Battery chemistry: LiFePO4 vs NMC
| Factor | LiFePO4 (LFP) | NMC Lithium-ion |
|---|---|---|
| Cycle life (80% capacity) | 3,000–6,000 cycles | 500–1,000 cycles | Lifespan (daily use) | 8–16 years | 1.5–3 years | Safety (thermal runaway) | Very low risk | Higher risk | Weight (per kWh) | ~12–14 kg | ~7–9 kg | Cost per kWh | Higher upfront | Lower upfront | Best for | Daily/weekly use, medical, long-term | Occasional camping, weight-sensitive |
Recommendation: For home backup, LiFePO4 is worth the premium. You buy once, it lasts a decade.
Solar input: can you recharge during an outage?
- Max solar input varies: 200W (budget) to 1,600W+ (pro).
- Real-world yield: 100W panel ≈ 60–80Wh/h in good sun. 400W array ≈ 250–350Wh/h.
- Balcony solar: 2×200W panels = ~1.2 kWh/day in summer. Can extend a 2 kWh station significantly.
- MPPT vs PWM: Always MPPT (Maximum Power Point Tracking) — 20–30% more efficient.
Rule: If you want multi-day autonomy without grid, solar input must exceed your daily draw. Otherwise you are just delaying the inevitable.
Comparison table: popular EU models (2024)
| Model | Capacity | Chemistry | Continuous / Surge | Solar input | Best for | ~Price (€) |
|---|---|---|---|---|---|---|
| EcoFlow River 2 Pro | 768 Wh | LFP | 800W / 1600W | 220W | Scenario A | 600–700 |
| Jackery Explorer 1000 v2 | 1,070 Wh | LFP | 1,500W / 3,000W | 200W | Scenario A+ | 900–1,000 |
| Bluetti AC70 | 768 Wh | LFP | 1,000W / 2,000W | 200W | Scenario A | 650–750 |
| EcoFlow Delta 2 | 1,024 Wh | LFP | 1,800W / 2,700W | 500W | Scenario B (base) | 950–1,100 |
| Bluetti AC200P | 2,000 Wh | LFP | 2,000W / 4,800W | 700W | Scenario B | 1,600–1,800 |
| Jackery Explorer 2000 Plus | 2,042 Wh | LFP | 3,000W / 6,000W | 800W | Scenario B+ | 2,100–2,300 |
| EcoFlow Delta Pro | 3,600 Wh | LFP | 3,600W / 7,200W | 1,600W | Scenario C (expandable) | 3,300–3,600 |
| Bluetti AC300 + B300 | 3,072 Wh (per B300) | LFP | 3,000W / 6,000W | 2,400W | Scenario C (modular) | 2,800+ per unit |
Prices approximate, EU retailers, 2024. Check current deals before buying.
What to avoid
- Lead-acid / AGM “solar generators” — heavy, short life, slow charge.
- NMC stations without LiFePO4 for daily home backup — degrade fast.
- “Peak watts” marketing — always check continuous rating.
- Proprietary expansion batteries that cost more than the base unit — compare cost per Wh.
- No MPPT solar charge controller — wastes 20–30% of solar.
EU-specific considerations
- Schuko plugs: Ensure station has EU sockets (or bring adapters).
- Balcony solar legal: Up to 600–800W plug-in solar is legal in Germany, Netherlands, Austria, Belgium, France (rules vary). Check local grid operator.
- CE marking & UN38.3: Required for battery transport/sale in EU. Avoid grey imports without.
- Warranty & service: EU consumer law gives 2 years minimum. Brands with EU warehouses (EcoFlow, Bluetti, Jackery EU) honour faster.
Quick decision flowchart
- Do you need to run a fridge? → Minimum 1,500 Wh, 1,800W surge.
- Medical device (CPAP)? → Non-negotiable. Size for 3+ days + 50% buffer.
- Work from home (router + laptop)? → Add 300–500 Wh/day.
- How many days without grid? Multiply daily Wh × days × 1.2.
- Can you solar recharge? If yes, smaller battery + big solar input works. If no, max battery.
- Daily use or occasional? Daily → LiFePO4 mandatory. Occasional → NMC acceptable.
Recommended starting points by budget
| Budget | Model | Why |
|---|---|---|
| €600–800 | EcoFlow River 2 Pro / Bluetti AC70 | LFP, 768 Wh, 800–1000W, good for Scenario A |
| €900–1,200 | EcoFlow Delta 2 / Jackery 1000 v2 | LFP, 1 kWh+, 1500W+, Scenario B base |
| €1,600–2,000 | Bluetti AC200P / EcoFlow Delta 2 + extra battery | 2 kWh+, expandable, Scenario B solid |
| €3,000+ | EcoFlow Delta Pro / Bluetti AC300 system | 3–6+ kWh modular, Scenario C, whole-home capable |
Next step
1. Do your audit — list devices, watts, hours.
2. Pick your scenario — A, B, or C (or custom).
3. Check current EU prices — links below are affiliate links to current deals.
- Portable Power Station EU deals (LFP, 768–2000 Wh)
- 100W Portable Solar Panel (MPPT compatible)
- 200W Foldable Solar Panel (MPPT, balcony legal)
- LiFePO4 100Ah Battery (for DIY expandable systems)
Then read Plug-In Solar Kits for Renters to pair your station with balcony solar.
FAQ
Can I run my fridge on a portable power station?
Yes, if the station has ≥1,500W surge and ≥1,000Wh capacity. Typical fridge compressor surge is 500–700W. Run a 120W fridge for 8–10h on 1 kWh.
How long will a 1,000Wh station run my router?
12W router × 24h = 288 Wh/day. 1,000 Wh ÷ 288 Wh = ~3.5 days continuous.
Can I charge the station from my car?
Yes, most have 12V car charger input (slow: 100–150W). Good for topping up while driving, not for fast recharge.
Is it worth buying extra batteries or a bigger unit?
Modular (extra batteries) is better if you may scale later. Single big unit is simpler if your need is fixed. Compare €/Wh over 5 years.
What about UPS mode (pass-through)?
EcoFlow Delta 2/Pro and Bluetti AC200P/AC300 support UPS mode (seamless switchover <20ms). Critical for desktop PCs, servers, medical devices. Check spec for "UPS" or "EPS" mode.
Can I use this in a flat without a balcony?
Yes — charge from wall socket. Solar is optional. Without solar, you have finite runtime = battery capacity ÷ your draw.
Next step
1. Spend 15 minutes doing your device audit (Step 1).
2. Pick a station from the EU LFP deals that covers your Wh + 20%.
4. If you have a balcony, check plug-in solar legality in your country.
5. Join the newsletter for the free checklist — power station sizing is Step 4.
Suggested internal links to add later
- Plug-In Solar Kits for Renters: What to Check Before You Buy
- Best First Portable Power Station for Off-Grid Beginners
- Off-Grid Solar for Beginners: A Practical First System
- Solar Roof Price Calculator
- Battery Chemistry for Beginners: LiFePO4 vs Lead-Acid vs Li-ion
- Balcony Solar in Europe: Legal, Landlord, Grid Rules by Country