Honda Outboard Alternator Question

[GbmChanty]

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?

Thanks
Gb

[GordMay]

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.