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Post by kris on Apr 19, 2017 17:12:37 GMT
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Post by tonyqj on Apr 19, 2017 18:13:02 GMT
What a load of bollox!
"All narrow boats suffer the same charging problems, in as much that, the leisure battery installation can be discharged whilst at mooring and when the engine is started to charge the batteries the surface charging voltage rises quickly and reduces the charge."
Presumably he meant "... reduces the charge current" but either way it's utter nonsense. When charging commences, unless the batteries are only shallowly discharged the complete opposite occurs. The charging voltage rises SLOWLY whilst the alternator puts out maximum current. Once the voltage reaches the alternator's regulated voltage which, on a correctly engineered system, is the optimum charging voltage for your batteries, the charging current slowly reduces as the battery's internal resistance rises.
None of this has anything to do with 'surface charge' as he describes and no amount of cheating or fiddling with settings will reduce the charge time.
All he appears to be offering is an alternator with a manual voltage control which enables you to boil your batteries at 16V, corroding the plates in double-quick time.
I just hope nobody falls for this bullshit.
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Post by kris on Apr 19, 2017 18:20:44 GMT
I wasn't thinking of buying one.
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Post by tonyqj on Apr 19, 2017 18:44:43 GMT
I wasn't thinking of buying one. I didn't say you were.
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Post by Deleted on Apr 19, 2017 18:55:21 GMT
Decent alternator reg, off, 1, both, 2 selector. Decent cabling and a couple of brain cells and we never run out of juice.
Tempted for a voltage sensing relay but remind myself my hand and brain still function OK. If I start getting forgetful I may fit a VSR.
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Post by JohnV on Apr 19, 2017 19:03:08 GMT
A tail light bulb wired between pos and armature was the original primitive bodge when your alternator regulator went bang and you needed a "get you home" a more sophisticated version used different lamp wattages to give different charging currents
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Post by Deleted on Apr 19, 2017 19:32:10 GMT
I'm planning to fit a Leece Neville 160a large frame alternator to my engine running on a single vee belt. No room for a double groove pulley. The big alternator is going to cane belts. a manual regulator would be handy to save the belt. The ebay one looks much too expensive to me.
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Post by kris on Apr 19, 2017 20:09:50 GMT
I think 160a on a single v belt is asking a lot. I think 110-120 amp is the maximum. Maybe with something like brammer belt you might do it. I was just curious about the manual control because of the NIFE batteries I've got.
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Post by Deleted on Apr 19, 2017 20:34:58 GMT
It is definitely too much for a single belt. I would like to have some sort of manual control so I can "dial in" the maximum output from the alternator. I think it can be done with a large rheostat but not entirely sure how.
Or size the alternator pulley so that it never reaches the revs to supply the full output. But that would make charging at tickover less effective.
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Post by kris on Apr 19, 2017 20:43:36 GMT
I'm pretty certain 160amp is too much for a single v belt.
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Post by Deleted on Apr 19, 2017 20:46:32 GMT
About 90a max apparently.
At ~14v
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Post by naughtyfox on Apr 20, 2017 7:43:54 GMT
I wasn't thinking of buying one. Yes, you were.
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Post by peterboat on Apr 20, 2017 8:58:05 GMT
It shows how far behind boats are in belt tensioning, all cars have it but boats that really could do with it never do crap isnt it?
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Post by Deleted on Apr 20, 2017 9:49:35 GMT
Serpentine belt you mean?
I bought a new Beta 90hp diesel engine a few years ago for one of my boats. The 175a Iskra alternator does have a multi vee belt but not with a vehicle type tensioner. It has a bottle screw type of arrangement. Obviously on a vehicle the serpentine belt runs more than just the alternator.
The water pump on the Beta 90 runs on a vee belt which also runs the smaller alternator.
Or maybe thats not what you meant?
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Post by peterboat on Apr 20, 2017 9:55:00 GMT
Serpentine belt you mean? I bought a new Beta 90hp diesel engine a few years ago for one of my boats. The 175a Iskra alternator does have a multi vee belt but not with a vehicle type tensioner. It has a bottle screw type of arrangement. Obviously on a vehicle the serpentine belt runs more than just the alternator. Or maybe thats not what you meant? Its exactly what I mean on cars the serpentine belt does a multitude of tasks and has a proper tensioner on it which means bearings are not put under excess strain. Boats however are just an old fashioned bodge and waterpumps etc fail because of it just plain crap engineering from barrus beta etc it really annoys me how bad they are
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