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Old 10-08-2009, 19:21   #1
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Join Date: Aug 2009
Location: Connecticut Shoreline
Boat: Catalina 27, 1983
Posts: 10
Honda Outboard Alternator Question

Hi all,
The manual with my new BF8A 8Hp Honda says that "The outboard motor's 12V output is designed to charge a 'starting or cruising' battery only. It is not intended to charge a 'deep cycle' type battery."
I've got a deep cycle battery now. It is not the sealed type. Would this be a risk for the motor and alternator, or the battery or for the boat and marina because of the explosion? Just wondering what the issue is and is a charge controller apropriate?

GbmChanty is offline   Reply With Quote
Old 11-08-2009, 04:51   #2

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
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The issue is the output rating (power) of the Outboard’s Alternator.
It’s a very small output, which is sufficient to re-charge a battery after starting, but insufficient to charge a depleted house bank.
If the outboard alternator is connected to a depleted house bank, requiring a “lot” of amp-hours to recharge, the alternator will be overloaded, causing premature failure. The house batteries will not likely be adequately recharged.
There is no particular danger of explosion.
Don't ask a single pony to pull a 4-horse wagon.

BTW: Many small outboards don't even have a regulated charger, suitable for battery charging; but actually have an un-regulated power supply, only suitable for running lights & etc.

Welcome aboard GB, and hope this helps.
GordMay is online now   Reply With Quote

alternator, battery, charging, honda, outboard

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