Alternator output is insufficient

[Beaux]

Re: Alternator output is insufficient

it is important if you are tilting/trimming frequently not to tilt/trim all the way to stall and then continue titlting to minimize battery drain because the difference in amp useage is drastic once the o/b is stalled at either extreme....dont have your specs but a 95-98 bosch conventional unit ranges from 30-35 amp for up tilt/trim at stall verses 7-10 amps for up trimming/tilting. Also you could check the trim electric motor to ensure it is good shape and not inefficient with its power useage (test procedure in your manual). Still cant think of easy way to increase actual output..i think effciency is going to be your key.

 

[Jim@KSC]

Re: Alternator output is insufficient

Sonnie - I couldn't find it.<br /><br /> schematic - Are you out there?<br /><br />Beau - Good advice; I'll take it!

 

[Beaux]

Re: Alternator output is insufficient

maybe you could install an extra battery charging stator coil on the outside of your flywheel that could possibly be mounted close enough to your magnets in the flywheel to create an extra 4.0 amp current? For that matter, maybe one could be added beside your existing stator coil under your flywheel... I think there are some four amp coils that are separate and bolt on for some model O/b's that might be able to be rigged in this use???..you would of course have to rectify into dc current if it is even room anywhere to mount another one... as you know, I am only hypothesizing....dont claim to know if/will/could it be done.. I bet these guys could figure it out.. otherwise....I am stumped. Good Luck

 

[Hooty]

Re: Alternator output is insufficient

Years ago, a bud and I were kicking around the feasibility of use an alternator to build a wind generator. We never did it, so don't know if it would work or not. Just another thought.<br /><br />c/6<br /><br />Hooty

 

[Jim@KSC]

Re: Alternator output is insufficient

^

 

[durk187]

Re: Alternator output is insufficient

http://www.mtmscientific.com/rewind.html <br /><br />Try this. It talks about rewinding your stator to produce more voltage.<br /><br />ALSO<br /> http://www.greeleynet.com/~cmorrison/generator-building.html

 

[ob]

Re: Alternator output is insufficient

Hears a link to ponder on although It will require a modest investment.Kind of a trick little accessory though.Maybe you could find an alternative use for one of these on land.<br /> WWW.emarineinc.com

 

[ebbtide176]

Re: Alternator output is insufficient

Jim, the link by duckcmdr might be something to do more research on.<br /><br />if its possible to replace your stator with a custom rewound stator, you can get more charging current for your motor. it might require replacing other components of your charging system also, to handle the higher current.<br /><br />back 15yrs ago, i worked in a starter/generator shop and we used some custom rewound stators for the same gm alternators given in the example. i think we were getting twice the output (like from 60 to 120amps). it was in S GA, but i think the supplier rewound them at their place in Atlanta.<br /><br />we were using them for the growing teenage fad of converting their caprice to a rolling sound stage, you know- when they rip out the back seat and put in twin kiddiepool sized woofers, amplifiers, and dual batteries <br /><br />they had more windings than the original, which i guess was machine wound...

 

[sonnie]

Re: Alternator output is insufficient

jim,<br /><br />i found the post. i'm not sure of how to post a link but the date is actually 18 feb 2002 posted by spiv high power alternator on outboard <br /><br />it is short and sweet but seems that it can, possibly has been done.<br /><br />sonnie

 

[sonnie]

Re: Alternator output is insufficient

jim,<br /><br />i would be inclined to go with what spiv has suggested that he would do. i would not want to go to length of rewinding alternators to increase voltage. rather choose your pulleys such that the gearing ratio spins the alternator to produce sufficient voltage. (off the shelf mass-produced items are less likely to fail on you- my opinion anyway) it is imperative that this voltage be regulated. that way your battery will last longer as high charging voltages decrease the life of the battery. if i remember what has been said on this forum previously, then battery voltage should remain below 17V to avoid damage to power packs.<br /><br />ob- how does the history lesson relate to some practical guideline on maximum loading of small ski craft?

 

[clanton]

Re: Alternator output is insufficient

In 1983 OMC made a 2 cylinder engine called Sail Drive, you could get a alternator kit that included the alternater, mounting brackets, drive belts and pulleys. You may find a parts book at a marina on OLD 41 north side of river in North Ft Myers, this would give you idel of what was needed. I would use a 60 amp single wire marine Delco alternator with internal regulator, and you may have to install a thrust washer on the lower bearing, not sure about this have not have one apart in a while.

 

[Jim@KSC]

Re: Alternator output is insufficient

Well, I've done as much internet research as I can...<br /><br />Too expensive, heavy or noisy: solar, gas generator, kicker, wind generator<br /><br />I'm leaning towards duckcommander's rewind job, if I can find a reasonable second stator. I think the battery will load the alternator enough to keep the voltage down. If I remember correctly, applying more voltage to a battery increases the current and lowers the internal resistance. I'm not too worried about the rectifiers; if they fry, I'll get a set from a later model that pumps 40+ amps.<br /><br />The add-on alternator sounds attractive too, simply because the parts would be dirt cheap (junkyard). It wouldn't have to be mounted inside the cowling, thus automotive would work. I could run it every 3-4 days, mounting and demounting. We always have extra time at camp. A 60 amp regulated alternator for a half-hour would recharge my battery by 1/4 or so. That should be plenty.<br /><br />As soon as I get a workweek less than 60 hours, I'll start, and keep you posted.<br /><br />Good ideas, guys!

 

[Trent]

Re: Alternator output is insufficient

Another thing you could do to charge your batteries is to make a generator. Iv done this and it works very well. Build a box and install an old lawn mower engine with a pully on it. Get a Delco car alternator with an internal voltage regulator and install it to the box also. Connect the two together via a belt. Connect to your batteries via wires (like a battery charger) and crank the engine and it will charge your batteries. You can get some of these items at a junk yard and an old engine at a old lawn mower repair shop. You can build this for less than fifty dollars. Just a thought...for remote charging in the outback.

 

[Jim@KSC]

Re: Alternator output is insufficient

I like those sort of projects, Trent!<br /><br />Dad put together a 'poor man's compressor' just like that. He left it on the lawnmower frame so he could bring it to the work.