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Old 06-10-2005, 07:51 AM
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Default battery draw of vhf

I have an 18 ft. CC with one battery. Right now I have no electronics, but I'm going to install a vhf radio and would like to know how much power they draw. I would not be using the radio for long periods of time without starting up the motor now and then. Is one battery enough for starting and the radio?
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Old 06-10-2005, 08:09 AM
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Default Re: battery draw of vhf

My guess would be 1/2 amp while receiving, 6 amps when transmitting on 25 watt.

You should be fine with 1 battery but depending on what type of boating/fishing you do. A 2nd battery is great peace of mind!!
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Old 06-10-2005, 10:39 AM
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Default Re: battery draw of vhf

They vary a little bit by brand and model but that's about right, an amp or less standing by and most of them draw between 4.5 and 7 amps when transmitting - which should be infrequently and for only short periods. Get a second battery, even if you have to take it out of the old lady's car. You don't even need a battery switch. Just stow it under a seat and carry a pair of vice grips in your back pocket if that's what it takes - but do not go out without a second battery, particularly if you intend to use electrical devices when the engine is not running. Anything is better than nothing.

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Old 06-10-2005, 04:19 PM
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Default Re: battery draw of vhf

The specs for the radio will list the current draw for transmitting and standby. I agree that a properly installed and wired battery is great peace of mind but there are thousands of boats out on the water with only one battery. Assess the risk and decide. You could carry one of the portable jumper packs along if you're worried.
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Old 06-11-2005, 10:23 PM
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Default Re: battery draw of vhf

Most car and marine batteries have a reserve capacity of about 90 minutes with a load of 25 amps. That means you can tun 25 amps of load for that long and should still be able to start the car/boat. If you have only a 1 amp load, you could run 25 times at long.

When fishing, I leave the radio running and the plotter/sounder for 4-5 hours at a time. The battery voltage remains at 12.5 the whole time.

You could easily run a VHF all day and still start your motor. If you don't have a spare battery on board, you can stow a pull start cord to start up if the battery dies.

Good luck,
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Old 06-12-2005, 12:58 AM
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Default Re: battery draw of vhf

If you are only running a VHF radio, you have nothing to worry about. Not a thing. You could stay on that radio like a teenage girl before prom night and not have a worry about the cranking battery.

It is not just the working AMP but the WATTAGE as well.

I can run my VHF, 200w stereo, Sonar, GPS, lights, and an intermittent blast from a 1m candlepower spotlight all night long and still cramk off my secondary (accessory) battery. If, by chance, (has never happened) I need to go back to my primary cranking battery, I always know I can fire her up. At 110-130mi. out, that is a good feeling!!!
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Old 06-12-2005, 01:15 AM
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Default Re: battery draw of vhf

get a jump starter power pak from target etc. You have it for the house and car also...great peace of mind and portable.
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Old 06-12-2005, 08:53 PM
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Default Re: battery draw of vhf

Thanks again for the help. My question was answered better than I was able to ask it.
I know there are a lot of people on this site with some good info for people like myself and others who are new to boating.
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Old 06-13-2005, 02:07 AM
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Default Re: battery draw of vhf

Quote:
Reeltronics Rob - 6/11/2005 10:58 PM
It is not just the working AMP but the WATTAGE as well.
Huh?

Assuming a properly working 12 volt system, they're directly related. If you assume 5 amps, power equals 60 watts. Can't be anything different. If one goes up, so does the other.

That makes it either one, take you're pick. Why are you saying "as well"?


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Old 06-14-2005, 12:32 PM
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Default Re: battery draw of vhf

Quote:
lciummo - 6/11/2005 11:23 PM

If you don't have a spare battery on board, you can stow a pull start cord to start up if the battery dies.
I don't think all of us can do that. My Volvo 5.0 I/O doesn't have a place for a "pull start cord".
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Old 06-14-2005, 10:01 PM
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Default Re: battery draw of vhf

Rwidman,
Your Volvo does have a place for a pull start cord! It is disguised as a crank pulley and hidden by a belt.
Good luck pull starting it though!
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Old 06-15-2005, 05:52 AM
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Default Re: battery draw of vhf



Actually I have a better plan - on water towing insurance
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