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Author Topic: Why's so hard to find a 12 volt smaller battery my fish finder on the kayak?  (Read 1078 times)

Fishermantim

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Yup
Wrong
Sorry

Itís ah/a=h
Amp hours divided by amps = hours

So your example would be

10/8=1.25 hrs

Sorry, but I just checked online to find the formula I mentioned, and it is:

The formula is 10 x battery capacity in Amp hours divided by load power (device power draw).

So a 12v 9ah battery and a 10.5 W fish finder would be 10 x 9 / 10.5 or 8.5 hours.

(kind of a "right church, wrong pew" scenario)
"God is playing to an audience that's afraid to laugh" (George Burns from "Oh, GOD")

"I'd rather have a bottle in front of me than a frontal lobotomy!" - The Existential Blues

Mac Attack

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Sorry, but I just checked online to find the formula I mentioned, and it is:

The formula is 10 x battery capacity in Amp hours divided by load power (device power draw).

So a 12v 9ah battery and a 10.5 W fish finder would be 10 x 9 / 10.5 or 8.5 hours.

(kind of a "right church, wrong pew" scenario)

W/V=A

10.5 watts / 12 volts = .875 amps

And again, ah/a=h

9ah /  .875 = 10.3 hrs

icejohn

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This is a good one to remember....
So my 12ah battery with a 10.5w device should last me bout 13.7hrs.
Thanks for sharing Mac.
take a kid hunting and fishing, it's a lot better than leaving them on the streets!!

woodsman

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This is a good one to remember....
So my 12ah battery with a 10.5w device should last me bout 13.7hrs.
Thanks for sharing Mac.
That's also assuming your battery is up to it's full potential.
Living proof \"that beer builds better bellies\".

icejohn

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Yup...brand new....for my kayak fishfinder...also have usb plug on it for my phone.
take a kid hunting and fishing, it's a lot better than leaving them on the streets!!

Mac Attack

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That's also assuming your battery is up to it's full potential.

Yup - for sure!
The ampere hours (capacity) diminishes as a battery ages.

seamonkey84

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Yup - for sure!
The ampere hours (capacity) diminishes as a battery ages.
Also with cold temps, as any of us ice fishers can tell you hehe.
"You know when they have a fishing show on TV? They catch the fish and then let it go. They don't want to eat the fish, they just want to make it late for something." - Mitch Hedberg

Mac Attack

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Also with cold temps, as any of us ice fishers can tell you hehe.

yup yup

Heat too!!

Batteries get fried in places like Florida

lowaccord66

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yup yup

Heat too!!

Batteries get fried in places like Florida

I have to go back to Orlando next April...blah!

 



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