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iPad, GPS and DC outlet
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ssobol



Joined: 27 Oct 2012
Posts: 3361
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
PostPosted: Thu Dec 31, 2020 11:54 am    Post subject: Reply with quote

smckean (Tosca) wrote:
Quote:
It is also possible for some outlets to provide too much current.

I don't think this is true. It is the appliance plugged into the outlet that determines how much current flows. An outlet can't "force" amps into a appliance. (I = E/R......the R is determined by the appliance.)

OTOH, I presume some appliances could be designed such that it assumes no more than a certain number of amps would ever be available. Or, in the case of the appliance not being plugged directly into the outlet, but into some intermediate unit (e.g., USB charger cube); then the R would be determined by the internal resistance of the appliance plus any resistance in the intermediate unit that was in series with the appliance. If the appliance is expecting that other resistance in some external unit to be there, and that unit is not there, then more amps would circulate thru the appliance since the appliance would have been designed for R = R (appliance) + R (unit).


Yes, the USB charger could be the current limiting device. I can see some rechargeable devices monitoring the charging current to keep the battery from overheating and causing problems (like catching fire) or to protect the internal wiring. The size of the units prevents having large charging regulators to control the charging current, so they just refuse to charge at all. Newer devices tend to have higher capacity batteries which could absorb a higher charging current if it is not regulated somewhere.
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tparrent



Joined: 24 Dec 2009
Posts: 285
City/Region: Apex
State or Province: NC
C-Dory Year: 2017
C-Dory Model: 255 Tomcat
Vessel Name: Tomfoolery
Photos: tparrent (TBD)
PostPosted: Sat Jan 02, 2021 8:34 pm    Post subject: Reply with quote

Tested the iPad in the car today. Navionics worked fine at reporting the proper heading of the car at all speeds.

Makes me think interference between the various boat electronics may have been the culprit. Hope to get down to the boat late next week to test it.

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Tom Parrent
2017 TomCat "Tomfoolery"
New Bern NC
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