Making a 12 volt motorcycle trickle battery charger

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Would it be possible to use one of those universal AC/DC power supplies
as a 12-volt battery trickle charger?

The power supply is one of those that you can select the voltage via a
switch, you can choose between 3 - 4.5 - 6 - 7.5 - 9 or 12 volts.
The output is DC & the current of the supply is 300mA. (3.6VA max)

I ask as I have seen Motorcycle trickle battery chargers for sale,
these only put out 300mA & looking at these they look very similar to
the power supply I have with the exception that they can only be
switched between 6 & 12 volts.

Any advice appreciated.
 
<tel1e@hotmail.com> wrote in message
news:1103035702.484226.259350@z14g2000cwz.googlegroups.com...
Would it be possible to use one of those universal AC/DC power supplies
as a 12-volt battery trickle charger?

The power supply is one of those that you can select the voltage via a
switch, you can choose between 3 - 4.5 - 6 - 7.5 - 9 or 12 volts.
The output is DC & the current of the supply is 300mA. (3.6VA max)
Click to expand...
Possibly but the voltage of a 12V battery rises to more than 12V when on
charge.
 
For safety and to not damage the battery, you should buy a proper charger
for it. You do not want to over or under charge a battery, especially one
that is a lead acid type. Obviously you are not well versed in the
engineering of chargers, and battery design, or you would not be asking this
question on a public news group.

This is a very strong safety recommendation.

--

Jerry G.
======


<tel1e@hotmail.com> wrote in message
news:1103035702.484226.259350@z14g2000cwz.googlegroups.com...
Would it be possible to use one of those universal AC/DC power supplies
as a 12-volt battery trickle charger?

The power supply is one of those that you can select the voltage via a
switch, you can choose between 3 - 4.5 - 6 - 7.5 - 9 or 12 volts.
The output is DC & the current of the supply is 300mA. (3.6VA max)

I ask as I have seen Motorcycle trickle battery chargers for sale,
these only put out 300mA & looking at these they look very similar to
the power supply I have with the exception that they can only be
switched between 6 & 12 volts.

Any advice appreciated.
 
I have a couple of these power suppliers & I have tasted their output
with a digital multimeter.

Most put out the voltage that is selected (or very near) but one of
them puts out 13.24 v on the 9 volt setting & 17.90 v on the 12 volt
setting!

If I had one of these adapters that say put out 14volts would it be ok
to use as a charger?

Thanks.
 
On 14 Dec 2004 08:33:16 -0800, tel1e@hotmail.com wrote:

I have a couple of these power suppliers & I have tasted their output
with a digital multimeter.

Most put out the voltage that is selected (or very near) but one of
them puts out 13.24 v on the 9 volt setting & 17.90 v on the 12 volt
setting!

If I had one of these adapters that say put out 14volts would it be ok
to use as a charger?

Thanks.
Click to expand...
You are most likely measuring the no load voltage on an unregulated
power supply and not the loaded voltage. When you draw current from
it you will see the voltage come down.
Stick to a charger made for your application.
 
On Tue, 14 Dec 2004 15:33:22 GMT, "JS" <JS@NoISP.com> wrote:

tel1e@hotmail.com> wrote in message
news:1103035702.484226.259350@z14g2000cwz.googlegroups.com...
Would it be possible to use one of those universal AC/DC power supplies
as a 12-volt battery trickle charger?

The power supply is one of those that you can select the voltage via a
switch, you can choose between 3 - 4.5 - 6 - 7.5 - 9 or 12 volts.
The output is DC & the current of the supply is 300mA. (3.6VA max)

Possibly but the voltage of a 12V battery rises to more than 12V when on
charge.
Click to expand...
It won't charge at all... takes at least 13.2V

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
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