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14 votes
Accepted

Why is a 12V outlet that provides 120W protected by a 20A fuse in my 2015 Forester?

The purpose of the fuse is to limit the current in the wire to prevent it from overheating. That could cause the insulation to melt or even start a fire. The other components in the circuit will (...
dlu's user avatar
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11 votes

Why is a 12V outlet that provides 120W protected by a 20A fuse in my 2015 Forester?

The fuse is for the entire circuit. There may be other things on that circuit, sharing that 20A fuse. Also, the gauge of wires used in a circuit is part of the "safe" current limits (maybe why your ...
tlhIngan's user avatar
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10 votes

Solar Charging Car Battery through Cigarette Lighter Outlet?

Why don't you connect it to the battery directly? Do you know, that mechanical contact with metal springs inside lighter plugs is not very reliable? It has relatively big resistance and will be ...
cyclone125's user avatar
7 votes

Solar Charging Car Battery through Cigarette Lighter Outlet?

On my car, the lighter (power) outlet is switched with the ignition, so it is not directly connected to the battery, so you would not be able to charge the battery through that connector if the ...
Peter Bennett's user avatar
6 votes
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Are garage outlets for electric cars evolving to 120V/240V/480V or to 30A/90A?

Since you are talking about, on the base side, an outlet having 120v/20A, I'll assume you are talking about here in the States, as I don't know what's going on with the rest of the world, but voltages ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

Solar Charging Car Battery through Cigarette Lighter Outlet?

If the outlet is directly connected to the battery then it should be possible. Make sure to connect the solar panel through a charge controller configured for the chemistry of you car battery, so the ...
Manu3l0us's user avatar
  • 151
4 votes

Solar Charging Car Battery through Cigarette Lighter Outlet?

There's a lot in your question, so let's look at it in parts: My vehicle's cigarette lighter outlet is limited to 10 amps output. If charging were limited to less than 10 amps, would solar panel -> ...
Der Kommissar's user avatar
4 votes

Why is a 12V outlet that provides 120W protected by a 20A fuse in my 2015 Forester?

On a properly designed circuit it should be safe to plug in a 20-amp device in the lighter port - the fuse is supposed to be the weakest link in the circuit so the port's wires should be able to ...
André Borie's user avatar
4 votes

Are garage outlets for electric cars evolving to 120V/240V/480V or to 30A/90A?

This is why concepts like Tesla's Powerwall will be valuable. Instead of uprating the socket and wiring to your garage, a storage battery will only need a "standard" utility power connection and then ...
Criggie's user avatar
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3 votes
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Semi-permanent power inverter

With inverters you also have to take into consideration the efficiency of the inverter itself when calculating power requirement. For example: 12V outlet is rated at about 10A or 120W. Inverter is 87%...
Old_Fossil's user avatar
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2 votes

Semi-permanent power inverter

I'm concerned about leaving the inverter on when the car is parked and draining the battery. How hard would it be to wire the inverter so that it is only enabled when the engine is running, or at ...
Yegor's user avatar
  • 121
2 votes

Why is a 12V outlet that provides 120W protected by a 20A fuse in my 2015 Forester?

You're over-thinking this. Any reasonable inverter (and even lots of dirt cheap crappy ones you get that plug into the cigarette lighter socket) is going to contain its own over-load protection; most ...
R.. GitHub STOP HELPING ICE's user avatar
2 votes
Accepted

Best way of power desktop speaker in car

I would choose the 12V to 230V to 18V pathway. Yep, it has more losses, but that doesn't matter if the speakers are powered only when the engine is on. 18V 2.6A is only 46.8W. Compare this to typical ...
juhist's user avatar
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2 votes
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12V 10A outlets: Slight smell of burnt copper at 8A. Is the outlet still safe now?

The smell you describe could be a sign of damage, or it could just be your power supply under a heavy load. The damage could be in the charging system, or the car. Your nose is a valuable tool for ...
GdD's user avatar
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1 vote

Why doesn't the AC inverter support my laptop?

Most likely the initial current surge needed by the power adaptor exceeds the inverter limit so it shuts down. Only solution is to get a better inverter.
Solar Mike's user avatar
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1 vote

12V car outlet gives 4.2V while no key inserted

Try different scales on the multimeter: does the lowest millivolt scale overflow? Is the value the same on the 1000 V scale? It's genuinely possible you obtain different voltage values at different ...
juhist's user avatar
  • 14.6k
1 vote

Why is a 12V outlet that provides 120W protected by a 20A fuse in my 2015 Forester?

Something I did not see mentioned here is that some if not most subaru power ports have an additional inline fuse on the back of the socket. therefore the fuse box fuse may not be the one to blow. i'm ...
user41630's user avatar
1 vote

Are garage outlets for electric cars evolving to 120V/240V/480V or to 30A/90A?

In North America where 120V is standard, lots of gearheads have 220V outlets in the garage for huge compressors. Electric dryers and electric ovens run on 220V also, so there's nothing new here. As ...
tlhIngan's user avatar
  • 12.2k
1 vote

How stable is voltage in a 12V car outlet?

There is another issue with a vehicle's electrical power. To keep vehicles as light, read, fuel efficient as possible, they scrimp on wire gauges. Costs less too. 14 gauge is fused at 20 amps, try ...
Stan's user avatar
  • 11

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