SG9665GC Power Draw

[Film Guy]

Ah, ok I get why the 5V side measuring now.
So, it's just about framing the question correctly...
Has anyone measured / know the total current draw (screen on & screen off), 12V side, when using the Street Guardian Cell Power and/or the included cig lighter adapter?

 

[peterharvey]

FYI:

-Screen off 260 milliamps

-Screen on 340 milliamps

(GPS plugged in, if GPS is unplugged you can subtract 20 milliamps)

The SG9665GC will use a bit less than a 5w globe that you'd find in a glovebox light or similar.

important thing it still needs 1A input minimum regardless

Is this 340 mA draw @ 5v or at 12v?

 

[Street Guardian USA]

SG9665GC is powered via 5V from the miniUSB port.

 

[peterharvey]

SG9665GC is powered via 5V from the miniUSB port.

Thus, it is 5V x 0.340A = 1.7 Watts power.
And this translates to "roughly" 1.7W divided by 12V = 0.141 amps current draw at 12 volts?

 

[flip9]

There will be a conversion loss stepping down from 12v to 5v. No power supply is 100% efficient.

Just round it off to 200mA at 12v. That's a more realistic figure.

 

[peterharvey]

There will be a conversion loss stepping down from 12v to 5v. No power supply is 100% efficient.

Just round it off to 200mA at 12v. That's a more realistic figure.

So with two SG9665GC's, the current draw would be about 400 mA at 12 volts.
Therefore, even a 1 amp fuse would be fine?
However, others say a 5 amp fuse would be fine too?
Or anything from 1 amp to a 5 amp fuse would be fine?
Because ultimately, we're trying to protect the vehicle, and not the dash cam.

 

[Street Guardian USA]

I've always recommended using a 5 amp fuse for years now with no problems

 

[peterharvey]

I've always recommended using a 5 amp fuse for years now with no problems

Sold!
Okay, I'll buy 5 amp fuses, because they are much more readily available than the smaller 3 and 4 amp sizes.

 

[Deleted member 46308]

I've always recommended using a 5 amp fuse for years now with no problems

I have been using 5amp with no problems as well.

 

[alexp999]

I've been running mine for over a year on a 1A fuse with no issues.

If it pulls the maximum of 1A on 5V (perhaps on boot?), that's only 0.42 A, even if the power converter was only 50% efficient (highly unlikely), it wouldn't pull more than 1A on 12V.

 

[jokiin]

2A fuse is what we would typically use, the recent question was about running 2 cameras from the one circuit in which case I'd use a 5A fuse, not so big as to prevent it protecting as intended