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 Author Topic:   Operating Voltage Maximum for GPS Receiver 1985supersport15 posted 06-09-2009 07:32 PM ET (US)         I have a Humminbird GPS [receiver] and chartplotter combo that I believe is supposed to run at a maximum of 12 volts. I have it set up with a 3-ampere in-line fuse. At times the system status indicates that the voltage is higher and lower than 12-Vdc. The lowest it has been is 11.8-Vdc and the highest may have been 13-Vdc. Is this something to be concerned about? Obviously the low voltage doesn't concern me but over voltage is never a good thing. Is this minor overvoltage ok? It seems to be when I am running at higher engine speeds and I am not sure if this has an effect. At what point should the 3-ampere fuse blow? I apologize in advance; I am electronically ignorant. I do not know the relationship between amps and volts. Thanks AC Chuck Tribolet posted 06-09-2009 09:02 PM ET (US)             12V is nominal. You'll see as much as 14.0-Vdc routinely. Youneed to check the manual for your GPS to see what the specis.Voltage doesn't blow fuses. Amps blow fuses.Chuck Chuck Tribolet posted 06-09-2009 09:05 PM ET (US)             If electricity were water, voltage would be water pressure,Amps would be gallons per minute.Chuck jimh posted 06-09-2009 09:29 PM ET (US)             It is unlikely that the maximum voltage that can be tolerated by your 12-volt device is exactly 12-volts. The nominal voltage in a 12-volt battery operated system is 13.2-volts. It is perfectly normal that when a battery is being charged the terminal voltage of the battery will rise to 14.4-volts. jimh posted 06-09-2009 09:31 PM ET (US)             A fuse with a rating of 3-amperes should open when the current through the fuse exceeds 3-amperes. The characteristics of the fuse and its tolerance to current above its rating are dependent on the particular design of the fuse. Consult the manufacturer of the fuse for the specifications of the fuse.

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