Trickle charger - Page 4 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #31 of 49 (permalink) Old 05-09-2018, 02:58 PM
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Trickle charger

Quote:
Originally Posted by Wire-Wheels View Post
At 12 volts and 2 amps you are charging at a rate of 24 watts. At 24 volts and 2 amps it would be 48 watts. The issue is not the voltage but the rate of charge compared to the capacity (amp.hr rating of the battery expressed in watts). Your 2 amp charger being used to charge a motorcycle battery works OK. I got the impression you were keeping in on the battery like a battery maintainer. I misunderstood. Sorry. Although your system is 12 volts and the one I used for an example is a 24 volt system, they work in the same way. ...J.D.


I am familiar with Ohmís law. The charger shuts off automatically. Once it is finished charging, I unplug the battery.


Quote:
Originally Posted by StuartMac View Post
Hi,







It depends where you read it. The correct formula is 1/10th of the given battery's Ah rating. So 2A charging a 20 Ah modern-bike battery is fine. Otoh, 2A charging a 7 Ah or 9 Ah battery on a non-electric-start Meriden Triumph would kill the battery in short order.



Hth.



Regards,


The article I read was at the time talking about modern batteries.

"Accelerate until you see God, then BRAKE!" -Kevin Schwantz

Last edited by Gabriel Syme; 05-09-2018 at 03:00 PM.
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post #32 of 49 (permalink) Old 05-09-2018, 07:02 PM
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Quote:
Originally Posted by StuartMac View Post
Hi,
It depends where you read it. The correct formula is 1/10th of the given battery's Ah rating. So 2A charging a 20 Ah modern-bike battery is fine. Otoh, 2A charging a 7 Ah or 9 Ah battery on a non-electric-start Meriden Triumph would kill the battery in short order.
I knew there was a maximum, but I did not know what the recommended MAX. charging rate was. That is good to know. Learn something new every day. ...J.D.
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post #33 of 49 (permalink) Old 05-10-2018, 10:51 AM
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Not sure about newer bikes but if you don’t at least disconnect the neg battery terminal, you have an excellent chance of burning out your rectifier/regulator. I have used a battery tender for years. Early on, I would leave the battery hooked to the bike while using it. Every spring while riding, I would notice my rectifier/regulator would work poorly or not at all. Turns out after speaking with a factory mechanic, I found out the tender will eventually burn them up.
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post #34 of 49 (permalink) Old 05-10-2018, 01:08 PM
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Quote:
Originally Posted by izzy1dog View Post
Not sure about newer bikes but if you donít at least disconnect the neg battery terminal, you have an excellent chance of burning out your rectifier/regulator. I have used a battery tender for years. Early on, I would leave the battery hooked to the bike while using it. Every spring while riding, I would notice my rectifier/regulator would work poorly or not at all. Turns out after speaking with a factory mechanic, I found out the tender will eventually burn them up.
How so? The tender is pushing out 200mA at most during the float stage. And voltage never gets more than 13.25V. When you're riding the bike at low RPMs, the bike reads over 13.5V already. If you're revving up the motor, the voltage reading will be well over 14V.

I don't understand how tenders burn rectifier/regulators. Did the mechanic give you any specific/technical explanation why this happens?

Riding it like I financed it.
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post #35 of 49 (permalink) Old 05-10-2018, 02:55 PM
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Quote:
Originally Posted by cadd View Post
How so? The tender is pushing out 200mA at most during the float stage. And voltage never gets more than 13.25V. When you're riding the bike at low RPMs, the bike reads over 13.5V already. If you're revving up the motor, the voltage reading will be well over 14V.

I don't understand how tenders burn rectifier/regulators. Did the mechanic give you any specific/technical explanation why this happens?
Yeah, a charger burning out R/R does not make any sense.

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post #36 of 49 (permalink) Old 05-11-2018, 08:28 AM
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Originally Posted by Old Cafe Racer View Post
All four of my bikes have LiPo4 lithium batteries, don't own a charger, never need one.

//ocr
I have lithium -iron batteries in both my street bikes, not vintage Triumph and my dual engine Triumph 650 LSR bike...The dual engine machine is total loss electric and after the race in July it sat in a trailer outside until just after Christmas...The battery still turned over the engines...
However, I have noticed the lithium batteries go from enough energy to do the job to dead without much warning like a lead acid battery....
But I won't buy another lead acid battery, AGM or old style....I like the small size and very light weight...

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post #37 of 49 (permalink) Old 05-11-2018, 09:24 AM
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AGM batteries have worked well for me and lasted several years. The OEM battery lasted 11 years with long periods of no use and very little charging.

Considering the Sprint ST weighs 500#, I donít think a lighter battery would make much difference. it certainly would not make the added expense worth it.

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post #38 of 49 (permalink) Old 05-11-2018, 10:31 AM
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I have 4 (750ma.Battery Tender Jr.) plugged in 24-7, year round. When a bike goes out on the road it gets unplugged. When I bring it back in, I plug it back in. I never know how long that bike will sit there since I have so many. I have never had a problem. The oldest bike (95 Sprint) has been sujected to this routine since 2002. Batteries are lasting 7-9 years. The pigtails are just wired straight to the battery posts with a fuse in between. You hear a lot of urban myths about this stuff, even from professional mechanics (I was one at a period in my life). ...J.D.
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post #39 of 49 (permalink) Old 05-11-2018, 10:45 AM
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I never asked the mechanic about the specifics as to why he said they would burn up the r/r if you trickle charged with the battery hooked up. Next time I run into him I’ll ask and then get back to you with his explanation. I’m far from an electrical wizard so I can’t even speculate. I do understand what you’re saying by the trickle not even charging at a rate as high as a bike running and charging.
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post #40 of 49 (permalink) Old 05-11-2018, 01:34 PM
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Quote:
Originally Posted by Wire-Wheels View Post
I have 4 (750ma.Battery Tender Jr.) plugged in 24-7, year round. When a bike goes out on the road it gets unplugged. When I bring it back in, I plug it back in. I never know how long that bike will sit there since I have so many. I have never had a problem. The oldest bike (95 Sprint) has been sujected to this routine since 2002. Batteries are lasting 7-9 years. The pigtails are just wired straight to the battery posts with a fuse in between. You hear a lot of urban myths about this stuff, even from professional mechanics (I was one at a period in my life). ...J.D.
7 bikes, all on battery tenders, 24/7 including some vintage ones. The BSA gets its main fused pulled before charging because the positive ground thing can confuse me sometimes. They sometimes stay on for 6+ months over our terrible winters (hate em).

I never had a problem, and some of my batteries are over 8 years old. YMMV
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