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Sci.Electronics.Basics -> 12v 4amp rechargable battery
There are 4 messages in this thread.
You are currently looking at messages 1 to 4.
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Author: Paul StewartDate: 12:23 29-02-08
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I have been googling on an off but not managed to find anything
suitable. I wonder if anyone on here is able to help.
I have a home made laptop. My problem is powering it from battery. I
am looking for a battery pack that outputs 12 and 4/5 amps. However I
also want something that comes with a charger and that will provide
enough current to both keep the battery charged and power the unit
when plugged into the mains.
Anyone any ideas on how I can achieve this?
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Author: BobDate: 18:44 29-02-08
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On Feb 29, 5:23 pm, Paul Stewart <paulstew...@phawfaux.co.uk> wrote:
> I have been googling on an off but not managed to find anything
> suitable. I wonder if anyone on here is able to help.
>
> I have a home made laptop. My problem is powering it from battery. I
> am looking for a battery pack that outputs 12 and 4/5 amps. However I
> also want something that comes with a charger and that will provide
> enough current to both keep the battery charged and power the unit
> when plugged into the mains.
>
> Anyone any ideas on how I can achieve this?
You need to consider;
How well regulated do you need the 12volt supply to be?
How long do you want to run from batteries?
How important is weight?
Battery packs vary somewhat if voltage between fully charged
and nearly exhausted. For example can your equipment
cope with say 11volts to 14volts?
If you need a maximum variation of say 11.5V to 12.5V you are going
to need a regulator or switcher between the batterys and the
equipment. That gives you the option of using a different battery
voltage, eg use an 18volt or 24volt battery pack with
a 12volt output DC-DC converter module.
There are plenty of off the shelf modules eg a Traco Power
TEN60-2412
I'd look at either gel-cell or AGM lead acid batterys or a stack of
18650 lithium ion cells.
Either way, theres a lot of current available and you need to
include fuses and suitable insulation.
People generally seem to make homemake laptops
by putting an LCD screen, a motherboard and a keyboard
in a robust metal suitscase. A series stack of 6volt
alarm batterys would probably fit in reasonbly well.
Lead acid will be heavier. Lithium ion will be more expensive.
A lead acid float charger will supply power for other things
as well as charging the batterys. Plenty of cheap
chargers on ebay direct from Hong Kong. A float
charger will hold the battery voltage at 13.8volts.
A constant voltage current-limited lithium ion charger would
probably work ok as well though drawing current might
interfere with the fully-charged detection. You can probably
find somthing suitable with a bit of searching.
12V times 4A =48watts, twice the power used by many laptops.
Four 6volt 10AH lead acid batterys and a 90% efficiency
DCDC converter dropping 24V to 12 volt would give you
around four hours on batterys.
Bob
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Author: www.ningbo-electric.comDate: 11:12 01-03-08
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On Mar 1, 7:44=A0am, Bob <b...@mailinator.com> wrote:
> On Feb 29, 5:23 pm, Paul Stewart <paulstew...@phawfaux.co.uk> wrote:
>
> > I have been googling on an off but not managed to find anything
> > suitable. =A0I wonder if anyone on here is able to help.
>
> > I have a home made laptop. =A0My problem is powering it from battery. =
=A0I
> > am looking for a battery pack that outputs 12 and 4/5 amps. =A0However I=
> > also want something that comes with a charger and that will provide
> > enough current to both keep the battery charged and power the unit
> > when plugged into the mains.
>
> > Anyone any ideas on how I can achieve this?
>
> You need to consider;
>
> How well regulated do you need the 12volt supply to be?
> How long do you want to run from batteries?
> How important is weight?
>
> Battery packs vary somewhat if voltage between fully charged
> and nearly exhausted. For example can your equipment
> cope with say 11volts to 14volts?
>
> If you need a maximum variation of say 11.5V to 12.5V you are going
> to need a regulator or switcher between the batterys and the
> equipment. That gives you the option of using a different battery
> voltage, eg use an 18volt or 24volt battery pack with
> a 12volt output DC-DC converter module.
> There are plenty of off the shelf modules eg a Traco Power
> TEN60-2412
>
> I'd look at either gel-cell or AGM lead acid batterys or a stack of
> 18650 lithium ion cells.
> Either way, theres a lot of current available and you need to
> include fuses and suitable insulation.
>
> People generally seem to make homemake laptops
> by putting an LCD screen, a motherboard and a keyboard
> in a robust metal suitscase. A series stack of 6volt
> alarm batterys would probably fit in reasonbly well.
>
> Lead acid will be heavier. Lithium ion will be more expensive.
>
> A lead acid float charger will supply power for other things
> as well as charging the batterys. Plenty of cheap
> chargers on ebay direct from Hong Kong. A float
> charger will hold the battery voltage at 13.8volts.
>
> A constant voltage current-limited lithium ion charger would
> probably work ok as well though drawing current might
> interfere with the fully-charged detection. You can probably
> find somthing suitable with a bit of searching.
>
> 12V times 4A =3D48watts, twice the power used by many laptops.
> Four 6volt 10AH lead acid batterys and a 90% efficiency
> DCDC converter dropping 24V to 12 volt would give you
> around four hours on batterys.
>
> Bob
Are you interested in APP SB Power Pole Connectors.
AMP 50 Connector.
SB 50 amp connector (gray, red, black). 50 amps maximum, for #6 gauge
stranded wire. Housing and 2 contacts supplied. 1-7/8" overall length.
Available in Gray, Red, and Black. Gray will be provided if no
preference is given. Each color will mate ONLY with the same color.
Also available for #10/12 AWG wire. 50 Amp Power Pole Connectors:1
Housing+2 Contacts one color mates with the same color only. It is: 50
amp rating, 600 Volts continuous AC or DC operation. UL listed.Made in
China,manufacturer of Ningbo Electric Pneumatic.
http://www.ningbo-electric.com/power-pole-connectors/50-amp-2-poles-Power-Co=
nnectors.html
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Author: John FieldsDate: 11:40 01-03-08
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On Sat, 1 Mar 2008 08:12:31 -0800 (PST), "www.ningbo-electric.com";
<alexyfy@gmail.com> wrote:
>On Mar 1, 7:44 am, Bob <b...@mailinator.com> wrote:
>> On Feb 29, 5:23 pm, Paul Stewart <paulstew...@phawfaux.co.uk> wrote:
>>
>> > I have been googling on an off but not managed to find anything
>> > suitable. I wonder if anyone on here is able to help.
>>
>> > I have a home made laptop. My problem is powering it from battery. I
>> > am looking for a battery pack that outputs 12 and 4/5 amps. However I
>> > also want something that comes with a charger and that will provide
>> > enough current to both keep the battery charged and power the unit
>> > when plugged into the mains.
>>
>> > Anyone any ideas on how I can achieve this?
>>
>> You need to consider;
>>
>> How well regulated do you need the 12volt supply to be?
>> How long do you want to run from batteries?
>> How important is weight?
>>
>> Battery packs vary somewhat if voltage between fully charged
>> and nearly exhausted. For example can your equipment
>> cope with say 11volts to 14volts?
>>
>> If you need a maximum variation of say 11.5V to 12.5V you are going
>> to need a regulator or switcher between the batterys and the
>> equipment. That gives you the option of using a different battery
>> voltage, eg use an 18volt or 24volt battery pack with
>> a 12volt output DC-DC converter module.
>> There are plenty of off the shelf modules eg a Traco Power
>> TEN60-2412
>>
>> I'd look at either gel-cell or AGM lead acid batterys or a stack of
>> 18650 lithium ion cells.
>> Either way, theres a lot of current available and you need to
>> include fuses and suitable insulation.
>>
>> People generally seem to make homemake laptops
>> by putting an LCD screen, a motherboard and a keyboard
>> in a robust metal suitscase. A series stack of 6volt
>> alarm batterys would probably fit in reasonbly well.
>>
>> Lead acid will be heavier. Lithium ion will be more expensive.
>>
>> A lead acid float charger will supply power for other things
>> as well as charging the batterys. Plenty of cheap
>> chargers on ebay direct from Hong Kong. A float
>> charger will hold the battery voltage at 13.8volts.
>>
>> A constant voltage current-limited lithium ion charger would
>> probably work ok as well though drawing current might
>> interfere with the fully-charged detection. You can probably
>> find somthing suitable with a bit of searching.
>>
>> 12V times 4A =48watts, twice the power used by many laptops.
>> Four 6volt 10AH lead acid batterys and a 90% efficiency
>> DCDC converter dropping 24V to 12 volt would give you
>> around four hours on batterys.
>>
>> Bob
>
>Are you interested in APP SB Power Pole Connectors.
>AMP 50 Connector.
>SB 50 amp connector (gray, red, black). 50 amps maximum, for #6 gauge
>stranded wire. Housing and 2 contacts supplied. 1-7/8" overall length.
>Available in Gray, Red, and Black. Gray will be provided if no
>preference is given. Each color will mate ONLY with the same color.
>Also available for #10/12 AWG wire. 50 Amp Power Pole Connectors:1
>Housing+2 Contacts one color mates with the same color only. It is: 50
>amp rating, 600 Volts continuous AC or DC operation. UL listed.Made in
>China,manufacturer of Ningbo Electric Pneumatic.
>http://www.ningbo-electric.com/power-pole-connectors/50-amp-2-poles-Power-Connectors
.html
---
Take it somewhere else, you SPAMming piece of shit.
--
JF
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