Solution for maintaing marine stereo memory - SailNet Community
 
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post #1 of 6 Old 04-23-2010 Thread Starter
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Solution for maintaing marine stereo memory

The new age marine stereos (Sony, Dual, etc.) all seem to have memories that need to be constantly fed power in order not to have recurring amnesia every time the house battery switch is cycled on & off.

Q: Does anybody know how many amps the memory will consume if the boat is unused for a couple of weeks & only connected to a single house battery?

Q: Has anyone used a smaller garden tractor battery to feed this power?

Q: Has anyone used one of those solar powered devices used to recharge cell phones / MP3 players for such an application?
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post #2 of 6 Old 04-23-2010
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This Kenwood draws .007 amps. This equals .168 amp hours per 24 hours.. It would take you a week to draw just 1.17 Ah's....

To put it in perspective a single standard 20 watt cabin light uses 1.66 amps for every hour used or 8.3 Ah's if you ran the light for 5 hours.

It would take you 42 days of memory to burn the same as a single 20 watt cabin light used for 5 hours...




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post #3 of 6 Old 04-23-2010
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Car stereos also have a small draw, and you can leave one parked for a long time before you kill the battery.

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post #4 of 6 Old 04-24-2010
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They do vary a bit, so its worth measuring the unit you use. Note some use a lot more power if 12v is supplied to both the power and ignition wires (with the unit off). So if the circuit breaker is shared with other devices it is desirable to have a seperate switch for lowest power consumption.
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post #5 of 6 Old 04-24-2010 Thread Starter
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Thanks for the memory!

Thanks to all for your answers. Seems as there is really no problem leaving a hot memory lead connected, similarly to the bilge pump power feed.

But, I have to say that I'm really impressed by Maine Sail's elegant reply. I am sure that many would test the drain with a multimeter, but to have an accompanying picture as well ----- IMPRESSIVE!!! Thanks so much.
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post #6 of 6 Old 04-24-2010
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You will learn that Mainsail does it right or he doesn't do it. A real asset to this forum.
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