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Portable 12 Volt Power Supply

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Oka
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Portable 12 Volt Power Supply

Post by Oka » Sat Dec 14, 2019 11:32 pm

Sometimes I need a 12V DC power supply. When no fully charged car battery is laying around, I would have to charge one up.
I just searched and found some. One thing, I would not want to spend too much on one. What portable power unit would one recommend?
Thanks.

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Re: Portable 12 Volt Power Supply

Post by volvolugnut » Sun Dec 15, 2019 10:35 am

First question is how much current do you need? Very low current could be supplied by two 6 volt flashlight batteries in series. Or do you want to plug a 12 volt power converter into wall outlet?

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Re: Portable 12 Volt Power Supply

Post by cn90 » Sun Dec 15, 2019 11:38 am

Go to amazon and search "battery portable charger for car".
They can be bought for $45+.
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Re: Portable 12 Volt Power Supply

Post by abscate » Sun Dec 15, 2019 12:58 pm

A small 12 volt power supply will be about 1/4 the cost of a 12 V charger, for 5-10 amps
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Re: Portable 12 Volt Power Supply

Post by Oka » Sun Dec 15, 2019 2:57 pm

volvolugnut wrote: ↑
Sun Dec 15, 2019 10:35 am
First question is how much current do you need? Very low current could be supplied by two 6 volt flashlight batteries in series. Or do you want to plug a 12 volt power converter into wall outlet?

volvolugnut
Just like the car battery would - 12-Volts. The "12 Volt power converter" may be what I need than getting a portable rechargeable unit that would produce 12 Volts. Working on a car and need to test a relay with a 12V power source.

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Re: Portable 12 Volt Power Supply

Post by Oka » Sun Dec 15, 2019 3:15 pm

Oka wrote: ↑
Sun Dec 15, 2019 2:57 pm
volvolugnut wrote: ↑
Sun Dec 15, 2019 10:35 am
First question is how much current do you need? Very low current could be supplied by two 6 volt flashlight batteries in series. Or do you want to plug a 12 volt power converter into wall outlet?

volvolugnut
Just like the car battery would - 12-Volts. The "12 Volt power converter" may be what I need than getting a portable rechargeable unit that would produce 12 Volts. Working on a car and need to test a relay with a 12V power source.
The AC to DC power converters I like has the cigarette lighter end adapter.

Just wondering. What if I connect a battery charger to a car battery as if am charging it, than tap from the battery connections?

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Re: Portable 12 Volt Power Supply

Post by Oka » Sun Dec 15, 2019 8:03 pm

cn90 wrote: ↑
Sun Dec 15, 2019 11:38 am
Go to amazon and search "battery portable charger for car".
They can be bought for $45+.
A battery charger did not give me what I need. I have a Schumacher SE50 I connected to a car battery, tested the connections and it was 15+ volts. I connected my 600A heavy duty jumper to the battery, it was twelve volts at the connections. I used the later to do a test on a fuel pump relay. So, battery charger does not do what I need. My setup was clunky but at least for now, it worked. Would really need a unit from AC to DC (12V).
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Re: Portable 12 Volt Power Supply

Post by Oka » Sun Dec 15, 2019 8:04 pm

abscate wrote: ↑
Sun Dec 15, 2019 12:58 pm
A small 12 volt power supply will be about 1/4 the cost of a 12 V charger, for 5-10 amps
The 12 volt power supply I have been seeing are with cigarette lighter end for the 12 volt output.
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Re: Portable 12 Volt Power Supply

Post by cn90 » Sun Dec 15, 2019 8:35 pm

I am confused.
The Schumacher SE50 does not provide what you need?
It is converting 120V AC to 12V DC.
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Re: Portable 12 Volt Power Supply

Post by cn90 » Sun Dec 15, 2019 8:37 pm

Or install a brand-new battery in the car and keep the old battery as a "tester".

Of course, charge the old battery once every 2 months or so.
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