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Old 22-08-2013, 14:00   #151
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Re: Size of Battery Charger

Originally Posted by hellosailor View Post
Decisions, decisions.
It IS a decision! I thought I had decided finally on the lifeline batteries and associated large charger, I may still go that way because it gives me the amp hours I need in the space I have available.

However, I can get 90% of the amp hours I need in a FLA for 1/2 the cost AND I don't have to worry about the mondo charger. I can take the extra cash and put it into a wind generator or more solar.

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Old 22-08-2013, 17:57   #152
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Re: Size of Battery Charger

Originally Posted by hellosailor View Post
"A 200A alternator is going to require a serpentine belt "
Ergh, no. A ribbed belt, or a double-belt (ugh) but ribbed belts actually work better when they are not installed serpentine fashion. Serpentine will require the extra roller/tensioner, ribbed doesn't need that, and by only bending in one direction instead of two opposite ones, it lasts longer too.
By serpentine belt, I was thinking of the wide belts with the wide pulleys added on to the alternator and crankshaft. Typically these also have an idler pulley too. Their purpose other than providing sufficient surface area to not slip is to relieve the side forces on the main bearings.

Any double belt or straight belt is going to load a small engine bearing in a detrimental way.

Either way, my point was that the OP should know that a 200A alternator will need some additional changes on the engine because a single belt is not going to drive it.



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Old 22-08-2013, 18:18   #153

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Re: Size of Battery Charger

Mark, the ribbed belts usually are installed on a serpentine path, but "serpentine" just refers to the path, not the belt itself. That's usually done to accommodate the placement of "stuff" on engines that have to fit in engine bays, or where there's one shaft or pulley "in there" as opposed to "out here".

"Any double belt or straight belt is going to load a small engine bearing in a detrimental way." Not really. The bearing has nothing to do with it, you could install a 1/2" v-belt on a 2" wide pulley and the pulley and bearing wouldn't know or care if it was a v-belt or a ribbed one. The problem is, when you use double belts inevitably one stretches more than the other (they used to be sold in matched pairs for that reason) and winds up carrying the whole load and snapping. And if you just used onebelt, there was never enough surface contact between the belt and the pulley so the belt starts slipping, somewhere around 80-100hp, and then that belt starts to come apart. Or some gorilla overtightens it, and that can kill any pulley regardless of the belt type. And usually kills either the alternator bearing, or the water pump, in car and truck engines. (They're usually on the same belt.)

The automakers *may* have had a good idea in switching to serpentine ribbed belts, because the belt tensioner is usually what pushes the belt "in" so much that the path becomes serpentine. And while belt tensioners often wind up failing and creating a maintenance issue, they also ensure the belt is properly tensioned (when they work) because no mechanic ever got fired for not using a belt tension gauge, despite "every" factory manual telling them to use it every time they touch a belt.

Marine engines? Well, with so many 30 year old boats around...<G>...we're the only folks left on the planet who still use v-belts. Except for British Sports Car enthusiasts, of course.

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battery, charger, size

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