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Old 08 May 2013, 08:43   #1
Country: UK - England
Town: Poole
Make: Honwave
Length: 3m +
Engine: Outboard
Join Date: Apr 2011
Posts: 113

Hi I've recently bought a 30hp for my boat it is electric start on a tiller. Not quite sure what battery to get for it! I would also like to run nav lights and a rule 360 bilge pump on my live bait well, I wouldn't run it continuously just for a few mins now and again. Would I need 2 separate batteries? I'd like to keep the amount of weight I'm carrying down as much as possible



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Old 09 May 2013, 10:22   #2
Country: USA
Town: Seattle, WA
Boat name: MiniGo
Make: Caribe
Length: 3m +
Engine: Outboard Tohat 10 HP
Join Date: Jan 2006
Posts: 8
A Group 24 size battery with 500 CCA will do great. No need for a second battery.

Just use it for less than 5 min. between charging with the engine and you will be fine. Your engine will be running at night so the nav lights won't use battery. If you have LED nav lights, they will last all nite on that size battery.

Rendova 380/40 HP Yamaha
CaptAl is offline   Reply With Quote
Old 09 May 2013, 11:34   #3
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
I used to run a Honda 40 off a garden/tractor battery (about the size of a large motorcycle battery.) It was used pretty much for starting, but would run a hh VHF and GPS while out on dives.

jyasaki is offline   Reply With Quote
Old 10 May 2013, 04:42   #4
Country: UK - England
Town: plymouth
Boat name: Viper
Make: humber
Length: 5m +
Engine: Johnson 70 VRO
Join Date: Jul 2012
Posts: 15
Oddessy make agm compact batteries designed for engine cranking. Light and rugged ideal for your application.

I use their mid size version for starting v8 diesels! Amazing power from such a small size.
jwfrary is offline   Reply With Quote
Old 10 May 2013, 14:41   #5
Peter_C's Avatar
Country: USA
Boat name: Uh...a kayak?
Length: 4m +
Join Date: Dec 2009
Posts: 1,485
Get LED nav lights. The aerator pump is going to be your biggest drain.

I use an Odyssey 925 and swear by it. They are expensive batteries, but have an incredible amount of power packed into a small package. Mine starts my boat, runs my LED nav lights, a VHF, Garmin GPS, and a bilge pump when needed.
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