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BH Reinen 
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Joined: 02 Nov 2009
Location: Wi
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 Topic: Eight volt battery charger
Posted: 10 Aug 2011 at 6:21pm |
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Who makes an eight volt battery charger? Thanks Bart
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Josh Day
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Joined: 29 Nov 2010
Location: Indiana
Points: 3427
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Posted: 10 Aug 2011 at 6:25pm |
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I just used the 6 volt charger,it takes longer but it works.
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Bill Long
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Joined: 12 Sep 2009
Location: Bel Air, MD
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Posted: 10 Aug 2011 at 6:44pm |
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When the eight volt was installed in the tractors we sold it helped start the unit but we only had a six volt charging system. Worked fine.
Good Luck!
Bill Long
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 10 Aug 2011 at 8:08pm |
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On the day when Bill sold those tractors with 6 volt batteries the generator had no voltage regulator, but had three brushes that turned it into a constant current machine that would put out considerably more than 7 volts (the charging voltage for a 6 volt battery). That's why the field was often connected to the light switch so as to turn up the current when turning on the lights. The three brush generator overcharged 6 volt and 8 volt batteries with equal ease and it DID overcharge them if it was run long enough each start. Probably about an hour to bubbling the electrolyte. Batteries charged by a three brush generator always needed water because of that overcharging.
A modern automatic battery charger won't charge an 8 volt battery, too high for 6 and too low for 12. Some were made as constant current to charge any voltage 6 through 18 or 24 but also were not automatic. Ones using a Tungar bulb should charge an 8 volt battery because the tungar bulb is a vacuum rectifier and has lots of voltage drop turning the charger almost into a constant current charger. You have to watch the battery for bubbling the charger is not going to taper off automatically.
Gerald J.
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Josh Day
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Location: Indiana
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Posted: 10 Aug 2011 at 8:44pm |
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never mind
Edited by Josh Day - 10 Aug 2011 at 8:46pm
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
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Posted: 10 Aug 2011 at 8:44pm |
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You can charge an 8V Battery with a 12V Battery charger for a very short period of time depending on how low the Battery is. Just don't forget that's it on. Monitor the process. Usually, in 20 minutes a 12V low amp trickle charger will bring the reserve up to around 8.2V. Once charged up, hook up an 8V Battery Tender after the Tractor has been used. The 8V Tender will keep the 8V Battery active and ready. We carry the 8V Tender in stock. Runs around $55.-60 bucks or so.......
Steve@B&B
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 10 Aug 2011 at 9:35pm |
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A modern battery charger with smarts will conclude its hooked to a 12 volt battery with a couple shorted cells and refuse to charge. Takes a dumb 12 volt charger to charge the 8 volt Steve's way.
Gerald J.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
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Posted: 10 Aug 2011 at 9:58pm |
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My old el-cheapo charger won't work on 12 for an 8 volt it buzzes for about 30 seconds and kicks off. If i put it on 6 volts it can stay on for a day and a half and make the battery spin the tractor over.
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Jeff Z. NY
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Joined: 11 Sep 2009
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Posted: 11 Aug 2011 at 1:00am |
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Battery Tender has one.
http://www.amazon.com/Battery-Tender-Volt-1-25-Charger/dp/B003D5I66E/ref=sr_1_1?ie=UTF8&qid=1313042082&sr=8-1
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Jeff Z. NY
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Posted: 11 Aug 2011 at 2:54am |
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Sorry Steve, I didn't see your post before I posted.
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DaveKamp
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Joined: 12 Apr 2010
Location: LeClaire, Ia
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Posted: 11 Aug 2011 at 8:48am |
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Now... if you have a soldering iron, and a LITTLE bit of electronic skills, you can make a charger to do that... or if you have more money and less time, you could get an adjustable regulated DC power supply... and Astron VS-20M series would work nicely... for bulk charging, dial it up to about 9.5v, and when done, trickle it at about 8.8, and it should be strangely nicely fine.
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DaveKamp
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Posted: 11 Aug 2011 at 8:55am |
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And if you want a diagram for a regulated charger, I can sketch and post 'ya one. Use an ordinary transformer into bridge rectifier, feeding a 7805 3-pin regulator chip... this will give you 5v out, but you can 'fool' it up to a reasonable charging voltage by putting six silicon diodes (say, a 1N400x [where x is any number from 1 to 7) forward-biased from the negative pin (center) down to the negative line. Each diode constitutes a 0.6v drop, so that means the 5v regulated output will actually be 3.6v higher... so 8.6v...
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 11 Aug 2011 at 9:03am |
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A resistive divider from output to negative floating the negative pin of the 7805 or LM317 will give better precision and temperature stability than the stack of diodes.
A LM317 would use 120 ohms output to control pin and 860 ohms to ground for 8.8 volts. And 8 volt (four cell) battery should float at 4 x 2.35 volts = 9.4 volts needing 820 ohms from control to ground.
Such a regulator needs a diode to prevent back current from burning out the chip when the AC goes off and the battery is still connected. That adds about 0.6 volts to the regulator output voltage, or 880 ohms with the LM317. Doesn't help the voltage regulation.
Gerald J.
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nsula_country
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Joined: 10 Mar 2011
Location: NW Louisiana
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Posted: 11 Aug 2011 at 9:09am |
I'm with Jeff. Deltran Battery Tender is the only 8V charger I could find. It puts out 1.25A. It is not fast, but proper. Hooking a 12 to an 8 is not SMART! It is dangerous. I know that some of you do it and think since you have not blown a battery up by doing it that it is ok... IT'S NOT! Buy the correct charger for the battery. Or build one. If I had more time I would build a larger one myself.
CT
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wbecker
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Joined: 29 Oct 2009
Location: STL
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Posted: 11 Aug 2011 at 2:59pm |
wwww.batteryminders.com
BB
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Allis B, IB, Low B, G, D10, JD M, 8KCAB, C152
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dpalmer
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Joined: 02 Mar 2011
Location: alabama
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Posted: 11 Aug 2011 at 10:57pm |
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these new smart chargers ....well yall know what i mean i hate em they aint worth nothing i mean if your atv battery dies over the winter or summer cant even use them.....useless
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Creek Jenkins
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Joined: 14 Sep 2009
Location: Northern Minn
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Posted: 12 Aug 2011 at 8:32am |
I lucked out this summer, found a 6 / 8 / 12 v charger at an auction. Has a "boost" setting as well. Really good shape, picked it up for $45, plus they threw in a dual grinder wheel with motor.
cheers
Creek
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