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Old 10-08-2009, 19:21   #1
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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?

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Old 11-08-2009, 04:51   #2
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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.
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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alternator, battery, charging, honda, outboard

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