Most people use their car's 12V socket for one thing: charging a phone. With a small pure sine wave inverter plugged in, the car becomes a rolling power bank that can run a lot of everyday equipment. The list below gives typical power figures so you can plan, then covers the limits that matter: your socket, the battery, and the things you should never plug in.
12 things you can run
| Device | Typical power (check your label) | Tip |
|---|---|---|
| 1. Laptop | 45–90W charger | Charge while driving, not for hours parked with the engine off |
| 2. Camera and drone batteries | 10–40W charger | Charge between locations so packs are ready at the next stop |
| 3. Wi-Fi router or dongle | Usually under 20W | Turns a parked car into a mobile office |
| 4. Small desk or clip fan | Usually under 15W | Useful during a long wait with the engine running |
| 5. LED lights | Usually under 20W | For camping, roadside repairs or a late arrival |
| 6. Several phones | Usually under 30W each | A multi-port charger keeps a family topped up |
| 7. A large power bank | Depends on its input; check the label | Top it up on the drive so it is full at the campsite |
| 8. Handheld game console | Usually under 40W | Long drives with children |
| 9. Portable speaker | Usually under 20W to charge | Charge on the way to a picnic |
| 10. Electric shaver or trimmer | Usually under 15W | Before a meeting or an event |
| 11. Breast pump or baby monitor charger | Check the maker's rating | Handy for parents on the road |
| 12. Tablet and e-reader | Usually under 30W | Entertainment for the back seat |
The one rule to remember
Add up the wattage of what you plug in and keep the total comfortably under the inverter's rating. A 200W inverter suits electronics, but it will not run high-power appliances like a fridge or kettle, which need far more (see can you run a fridge on a car inverter).
Your socket is the real limit
Most 12V sockets are protected by a 10 to 15 amp fuse, roughly 120 to 180 watts at the input, and some power is lost in conversion. Two laptops charging at full speed plus a few phones can go over that. Our watt guide has worked examples.
Use USB-C when the device supports it
Phones, tablets and many laptops charge over USB-C. Plugging into a USB-C PD port skips the step of converting to 230V and back, which wastes less power. Keep the AC outlets for chargers that need a normal plug.
Engine on, or engine off?
With the engine running, the alternator supplies the power. With the engine off, everything comes from the battery, and you need enough left to start the car. Short top-ups are fine; hours of laptop use with the engine off are not. Read whether it is safe to leave an inverter plugged in.
What not to plug in
- Anything that heats: kettles, irons, hair dryers, room heaters. They draw hundreds to thousands of watts.
- Household fridges and pumps: their startup surge is far beyond a small inverter.
- Critical medical equipment without the maker's confirmation: check that the device is approved for inverter use and have a backup.
Why pure sine wave
Sensitive electronics such as laptops, cameras and medical devices want clean power. A pure sine wave inverter delivers power like a wall socket, while cheaper modified sine wave units can cause buzzing and heat.
The EchoRepel 200W Pure Sine Wave Inverter plugs straight into your 12V socket and turns the drive itself into a power source for the devices most people carry. For a full mobile office, see our work-from-car setup guide.