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Old 01 January 2010, 12:33   #1
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battery for garmin 90

can anyone tell me what Ah rating i would need as a minimum to run my ff90. I dont have a charging facility on my rib so any idea of how long it would last would be fabulous. I know i need a deep cycle battery, not bad for a monkey keeper!!
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Old 03 January 2010, 12:55   #2
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Originally Posted by zookeeper View Post
can anyone tell me what Ah rating i would need as a minimum to run my ff90. I dont have a charging facility on my rib so any idea of how long it would last would be fabulous. I know i need a deep cycle battery, not bad for a monkey keeper!!
I use a 12volt 7ah gun lamp battery for my garmin 140, it last for about a week without charging
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Old 04 January 2010, 11:58   #3
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The manual says the unit comes with a 2 amp fuse, so that would be the absolute max current draw.

At 2 amps, I'd expect the self-discharge of most wet cell batteries to come into play at longer life expectancies.

In other words, that low of a current draw implies you could use pretty much any 12 volt battery and get a day's use out of it. Motorcycle, tractor/garden, auto; don't think it really matters.

And I don't think you'd need a deep cycle battery unless you really plan on running the battery down to near-nothing a lot. Normal starting battery will do fine (especially since it doesn't sound like you'll be using it for anything but the unit.)

jky
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Old 04 January 2010, 18:49   #4
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thank you that has helped, many thanks
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