Voltage and Sonar Operation

[MNBIGBEAR]

I have a Lowrance 510C sonar hooked up to the cranking battery. When I have the GPS unit running and other things on in the boat the voltage meter on my sonar sometimes reads as low as 9.1-9.2 volts... will this affect how the sonar operates? (thinking it may be time to replace the cranking battery)

[Cliff Wagenbach]

I am surprised that the 510-c does not shut down at that low voltage!

My old 510-c would shut down if it ever got below 12 volts!

My guess is that you need a new starting battery as you assumed. Get as large of a battery as your battery area will accommodate. May cost a little more but will last longer with fewer problems.

Cliff

[jentz]

Something is radically wrong there??I'd guess the 510 metering is askew.

Heres something to look at.

* Fully charged batteries store at 12.75 volts

* 50% state of charge is 12.3 volts

* 100% state of discharge is 11.90 volts

[Hoey]

Sounds like a bad cell in the battery. A volt meter would be useful in determining this. A battery with a dead cell will still take a charge and show a full charge.

[Whoaru99]

I have a Lowrance 510C sonar hooked up to the cranking battery. When I have the GPS unit running and other things on in the boat the voltage meter on my sonar sometimes reads as low as 9.1-9.2 volts... will this affect how the sonar operates? (thinking it may be time to replace the cranking battery)

Is the 510C connected directly to the battery, or connected to the wiring somewhere else in the boat?