Yes — you can charge at a friend’s or relative’s house, with their permission. Good guest etiquette has four parts: ask before you plug in, keep the charging current modest on a circuit that is not yours, pay for the electricity you take, and leave everything as you found it. The money is smaller than most guests expect: a generous 30 kWh top-up costs about $5.49 at the U.S. average residential price of 18.31 cents per kWh.
Key Takeaways
- Ask first, use the outlet offered, and agree parking and duration before you plug in.
- Turn your portable charger down — a host’s circuit was not sized around your visit.
- Pay for the energy on the spot: most top-ups cost your host only a few dollars.
- Unplug when you have enough, coil the cable, and leave their setup exactly as you found it.
Ask First, and Agree the Basics
- Ask before you arrive if you can — a text ahead of the visit beats plugging in on the doorstep.
- Use the outlet or charger they offer. If you bring your own portable charger, say so; do not go hunting for a free socket.
- Agree where to park so your car does not block theirs, their garage, or their own charger.
- Agree how long — a two-hour top-up and an overnight charge are different favours.
- Offer to pay up front. Naming it early keeps the visit relaxed.
Keep the Load Gentle on Someone Else’s Circuit
Your host’s wiring is the part of the visit you cannot see. EV charging draws its set current continuously for hours — which is why installation rules size breakers at 125% of charger current — and you do not know what else shares your host’s circuit. The polite move is to turn your portable charger down: a visit rarely needs maximum speed. The figures below are approximate, at 240 V:
| Charger setting | Power draw | Energy in 4 hours | Cost at 18.31¢/kWh |
|---|---|---|---|
| 16 A | About 3.8 kW | About 15 kWh | About $2.81 |
| 24 A | About 5.8 kW | About 23 kWh | About $4.22 |
| 32 A | About 7.7 kW | About 31 kWh | About $5.62 |
Two more circuit courtesies: never unplug your host’s appliances to free a socket, and ask before using a heavy-duty outlet such as a dryer socket — it may be exactly what they run their evening on.
Pay Your Way Without Making It Awkward
Read the energy from your car’s screen or the charger app when you finish, multiply by your host’s price per kWh — the U.S. average of 18.31 cents is a fair stand-in if they do not know theirs — and round up. Pay on the spot, by cash or payment app, rather than leaving it vague. Our guide to what it costs to charge an electric car at home shows the same arithmetic from the host’s side. Most hosts refuse the money; offering it properly is the etiquette, and a bottle or a returned favour settles the rest.
Leave the Setup as You Found It
- Unplug when you have enough — do not sit at 100% on their charger out of habit.
- Coil the cable back on its holder, off the walkway; a cable across a path is a trip hazard, a point our UK guide on running a cable across the pavement makes in detail.
- Move your car if it blocks anything once you are done.
- Say thanks, and offer the same at your place — guest charging works because it goes both ways.
Bringing your own portable charger removes the connector-matching problem entirely. The EVDANCE EV-AC04001U is a 40 A J1772 portable unit that can be set lower for a host’s circuit, and the EV-ACS3210T adjusts from 10 to 32 A in six steps; our portable EV charger buying guide compares the options. The norms at a stranger’s public charger are stricter still — see how to use a public EV charger.
Frequently Asked Questions
Is it rude to charge at someone’s house without asking?
Yes. The electricity is cheap, but the circuit, the parking space, and the charger are theirs. Asking takes a minute and turns a presumption into a favour happily given.
How much should I pay for charging at a friend’s house?
The energy you used multiplied by their price per kWh — about $3.66 for a 20 kWh top-up at the U.S. average price. Round up; the point is the gesture being complete, not the exact change.
Can I plug into any outdoor outlet at their house?
Only the one they offer you, and keep the current low: a household socket circuit may be shared with other loads. A portable charger set to a modest current is the safe guest setting.
Related Reading
- How Much Does It Cost to Charge an Electric Car at Home?
- Portable EV Charger Buying Guide 2026
- How to Use a Public EV Charger (and How to Stop It)
- Can You Run an EV Charging Cable Across the Pavement? (UK)
