The Shipyard ( Dry Dock ): Builds & Questions > Bait Boats

12v 12ah batteries

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northsider1:
HI EVERYONE, I'M NEW TO THIS SITE SO NOT SURE WHERE TO POST THIS QUESTION SO I THOUGHT I WOULD START HERE.
IN THE PAST I HAVE ONLY PURCHASED THE ODD ONE OR TWO PRE-BUILT BOATS JUST TO SEE IF THIS NEW HOBBY WOULD INTEREST ME. AFTER ABOUT 12 MONTHS I DECIDED TO BUILD A PAIR OF WORKING TUGS (IRON SIDER) & (NORTH SIDER) THESE WERE KITS THAT WERE  70% COMPLETE. I HAVE HAD A BREAK FROM BOATS TO PERSUE OTHER HOBBIES BUT NOW AFTER 12 MONTHS I AM BUILDING A BAIT BOAT FOR FISHING IT WILL BE POWERED BY 2x 12V BILGE PUMPS. THE QUESTION I WANT TO ASK IS WHAT IS THE DIFFERENCE BETWEEN A 12v 7ah   and a 12v 12ah BATTERY ? SORRY IF THIS SEEMS A BIT OF A DAFT QUESTION BUT I'M STILL LEARNING ABOUT THESE THINGS.

MANY THANKS

andyn:
The ah rating is the capacity of the battery, and usually with SLA batteries the size too, as more cells are needed within the battery to make up the capacity, so your 7ah battery is 7000mah, and your 12ah is 12000 mah, so the bigger battery has 5000mah more. The bigger the number on the same voltage, the longer the battery will last.

Hope this helps :-))

Peterm:
Another simple way of looking at it:   If a motor draws 1 Amp when running, a 7Ah battery will keep it going for about 7 hours, a 12 Ah for about 12 hours.  Hope I haven`t tried to oversimplify it.   Pete M

northsider1:
THANKS  andyn AND Peterm    :-)) :-)) YOU COULD NOT HAVE MADE IT EASIER FOR ME. SIMPLE REALLY WHEN YOU PUT IT LIKE THAT.
NOT SURE WHAT BATTERIES TO GO FOR YET, THE ONLY DOWN FALL WITH THE 12ah IS THE SIZE. I MUST FIND OUT WHAT  AMPS THE MOTORS DRAW. ALL I KNOW IS THAT THEY CALL FOR A 6amp FUSE

THANKS FOR THE HELP

andrewh:
Northsider,

You have also found that the capacity 12AH and 7AH comes from lead so the weight of a 12AH will be (almost exactly) 12/7ths more than a 7AH battery!

Please tell us what the motors are - there are many very knowledgeable folk who will know them and be able to give you chapter and verse.  Also it is actually the prop(s) that take the current - ideally it helps to know the prop size and boat speed as well to estimate the actual current draw "on the water"

As an aside, I and many others  are dyslexic, and have a lot of trouble reading capitals, so would you please try and post in lower case.  Some people also consider it to be the equivalent of shouting

regards
andrew

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