Emergency Power Supply: Staying Charged During a Blackout
Power banks, solar panels, generators, and batteries: how to keep essential devices running during a power outage.
What Loses Power When the Grid Goes Down
A power outage affects modern households far more severely than most people expect. Heating systems, refrigerators, routers, and every device that plugs into the wall becomes unavailable. Within a few hours, phone batteries die, and access to information dries up.
The realistic goal is not to power the entire house — it is to keep the most critical devices running:
- Smartphone (communications, emergency alerts, flashlight)
- Battery radio (official emergency broadcasts when the internet is down)
- Medical devices (insulin pumps, CPAP machines, home monitors)
- Basic lighting (LED lanterns, headlamps)
- Optionally: a laptop for work or essential tasks
A layered approach — power banks, solar, and generators — provides redundancy for outages of different durations.
Power Banks: Your First Line of Defense
Power banks are the simplest, most affordable solution for short-term outages lasting hours to a day or two. They are available everywhere, require no technical knowledge, and charge smartphones, tablets, and small devices reliably.
What to look for when buying:
- Capacity (mAh): A 20,000 mAh power bank charges a typical 4,000 mAh smartphone battery 4–5 times (accounting for conversion losses).
- Output wattage: Look for at least 18 W (Power Delivery / PD) for fast charging. Budget models often deliver only 5 W.
- Connectors: USB-C (PD) plus USB-A covers most devices. Some models include a 12 V car output.
- Brand quality: Established brands (Anker, Baseus, Ugreen) are more reliable than unbranded imports, which can swell or overheat.
Recommendation: Keep at least two 20,000 mAh power banks per household. Store them charged to 80% — keeping lithium batteries at full charge reduces their lifespan over time.
Solar Panels: Independence From the Grid
Portable solar panels enable recharging power banks and batteries without any grid connection — as long as sunlight is available.
Types for home use:
- Foldable solar panels (10–100 W): Compact, portable, ideal for balconies or gardens. A 40 W panel in good sunlight can charge a 20,000 mAh power bank in 4–6 hours.
- Rigid panels (100–400 W): For permanent roof mounting. Combined with a lithium battery pack (e.g., EcoFlow River, Jackery Explorer), they create a functional home backup system.
- All-in-one solar generators: Integrated battery, solar input, multiple outputs (AC 230 V, USB, 12 V). Ideal for users without technical knowledge.
Realistic expectations: A 100 W panel delivers roughly 70–80 Wh per hour at optimal angle and full sun. In winter or overcast conditions, output drops significantly. Plan conservatively — assume 30–50% of rated output on an average day.
Generators: Sustained Power for Extended Outages
When a power outage lasts multiple days, fuel-powered generators outperform solar in raw capacity. They deliver standard 230 V AC and can run high-demand appliances like a refrigerator or heating pump.
Generator types:
| Type | Power Output | Fuel | Noise Level | Best For |
|---|---|---|---|---|
| Inverter generator | 1–3 kW | Gasoline | Quiet | Sensitive electronics, laptops |
| Conventional generator | 2–8 kW | Gasoline/diesel | Loud | Robust appliances, cooling |
| Propane/LPG generator | 2–7 kW | LPG | Moderate | Longer fuel storage |
Safety rules — non-negotiable:
- Never operate indoors, in garages, or near windows — carbon monoxide poisoning is fatal
- Maintain at least 3 meters of clearance from any opening
- Store fuel only in approved canisters — residential buildings in Germany are limited to 10 liters of flammable liquids
Batteries: Small Reserve, Big Impact
Battery-powered devices — flashlights, radios, clocks — are often overlooked until they are needed.
Recommendations:
- Alkaline batteries (AA, AAA): Shelf life up to 10 years. Ideal for stockpiling.
- Lithium batteries: More expensive but last up to 20 years in storage and perform better in cold temperatures.
- Rechargeable NiMH batteries: Cost-effective for daily use but self-discharge over months — recharge before the emergency, not during it.
Stock all battery sizes your devices use: AA, AAA, C, D, and 9 V.
Hand Crank Chargers and Manual Generators
As a last resort, crank chargers convert manual effort into electricity. Expect roughly 1–3 minutes of talk time per 5 minutes of cranking — enough for an emergency call, not for sustained use.
Combination devices: Many emergency radios include built-in crank dynamos, small solar panels, and LED flashlights in a single unit. These are among the most useful single items for an emergency kit — covering radio reception, lighting, and emergency charging in one compact device.
Prioritizing Your Investment
Not every household needs an expensive generator immediately. A sensible progression:
- Today (under €50): Two 20,000 mAh power banks, keep charged
- Short term (€100–200): Battery reserve for all flashlights and radios; combination emergency radio with crank + solar
- Medium term (€300–800): Foldable solar panel + portable solar generator (500–1,000 Wh)
- Long term (€1,000+): Stationary solar backup or fuel generator for multi-week outages
Starting with step one takes less than an hour and costs less than a restaurant dinner. The protection it provides is immediate.
