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About Battery Maintainers. . . .

 
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skywagon



Joined: 11 Feb 2006
Posts: 184

PostPosted: Mon Sep 17, 2018 1:33 pm    Post subject: About Battery Maintainers. . . . Reply with quote

Subject: Re: About Battery Maintainers. . . .

The question about changing the charging clamps/jacks. . . .
Quote:
That style of maintainer delivers very low current to do the job.
You could remove the provided "clamp" connectors and attach some thing as simple as the old style RCA jack. Really anything that you have handy. If the unit supplied large currents, you would have to be more selective.


Keep in mind a couple of things with most styles of maintainers.
1. They usually need to connected to the battery before connecting to 120vac.
2. If the unit is connected to the battery, but, the 120 vac is disconnected or lost do to a power line failure, the battery will slowly discharge back thru the circuitry of the maintainer. This can also happen when the unit is connected to 120 vac that is fed by a GFI controlled ac line. If the GFI is tripped/opens that line by some incident, and you are not there to disconnect the maintainer, the battery will slowly be discharged.
Maybe some of the units have a reversed diode in the charge line now, but, the charging/float circuit would have to be adjusted to compensate for diodes forward loss.




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yellowduckduo(at)gmail.co
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PostPosted: Mon Sep 17, 2018 2:16 pm    Post subject: About Battery Maintainers. . . . Reply with quote

I used to not pay much attention to the connection sequence but it seems
that connecting some of these small chargers to the battery before
plugging in to the mains is actually good advice. I have several 1.5
amp  Schumacker 1562 charger maintainers of varying vintages that can
put out surprisingly high voltage 120 hz pulses when not connected to a
battery. Discovered that while investigating why a very cheap digital
ammeter supposedly good for 30 volts got fried. Again no issue at all if
the battery is connected before plugging in to the mains.

The units I have are all controlled by a microprocessor but they are all
over the map in terms of how much 14.5 volt charging they will do before
switching to the 13.4  volt nominal maintaining mode and none of them
have any internal adjustments to tweak.

Ken
On 17/09/2018 5:32 PM, skywagon(at)charter.net wrote:
Quote:


Subject: Re: About Battery Maintainers. . . .

The question about changing the charging clamps/jacks. . . .

That style of maintainer delivers very low current to do the job.
You could remove the provided "clamp" connectors and attach some
thing as simple as the old style RCA jack. Really anything that
you have handy.  If the unit supplied large currents, you would
have to be more selective.

Keep in mind a couple of things with most styles of maintainers.
1. They usually need to connected to the battery before connecting
to 120vac.
2. If the unit is connected to the battery, but, the 120 vac is
disconnected or lost do to a power line failure, the battery will
slowly discharge back thru the circuitry of the maintainer.  This
can also happen when the unit is connected to 120 vac that is fed
by a GFI controlled ac line.  If the GFI is tripped/opens that
line by some incident, and you are not there to disconnect the
maintainer, the battery will slowly be discharged.
Maybe some of the units have a reversed diode in the charge line
now, but, the charging/float circuit would have to be adjusted to
compensate for diodes forward loss.



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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
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