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Personal Project electrical question

alanwarrick

Hello all,

 

I am new here. I have a personal project here for the sake of brevity ill refer to as NX Harbor.

 

I have some electrical challenges, there are two major components to this projects that will require a fair bit of power at different draws.

 

One component's supply is listed as a 12v4a(48w) supply, i know for a fact it will not use this much power as it is a generic supply and the important number is the 12v

 

the second one is the challenge, i know for a fact that this device at most uses 15v@1.2a typically at peak.

 

The challenge here is that i want to power both of these off of a single battery bank with between 3-4Ah capacity and is no more than an inch thick.

 

I hope this is a no brainer for someone out there somewhere, and to you, thank you in advance.

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    Hi Alan,

     

    Unfortunately there isn't enough information  (battery capacity cannot be deduced from an Ah value, unless you specify the voltage of the battery bank; a 1.2V 3AH battery can store ten times less energy than a 12V 3AH battery for example).

    If I make some assumptions, then your goal is possibly unrealistic. 3-4AH at a sufficiently high voltage to make something that consumes 48W, or even half that, for any reasonable amount of time (guessing an hour or longer?) is a large enough capacity to not be a typical off-the-shelf rechargeable battery. A custom one-off battery pack isn't feasible without some experience in building and charging multi-cell batteries, and could be dangerous.

    The easiest way to find a battery is to go to a distributor website and type in your desired max width in the parameters selection box. I did that at farnell.com and this is the result: http://uk.farnell.com/w/c/batteries-chargers/batteries-rechargeable?external-width=20mm|25mm&st=12v+battery

    Just one 12V battery there slightly begins to approach the requirement, but has a 2AH rating.

    Since you require 12V and 15V, one approach could be to select a 12V rechargeable battery, since it will directly be able to power one of your components (use a fuse in-line). For the 15V device, you could use a 'boost converter' or 'DC-DC converter', such as this one:

    JCK2012S15 XP POWER, Isolated Board Mount DC/DC Converter, 2:1 Input, 1 Output, 20 W, 15 V, 1.33 A | Farnell element14

    It will convert a 12V supply to a 15V one, at up to 1.3A which will cover 1.2A peaks. Again, to find these, the parameters can be entered on the distributor website.

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  • 0

    Hi Alan,

     

    Unfortunately there isn't enough information  (battery capacity cannot be deduced from an Ah value, unless you specify the voltage of the battery bank; a 1.2V 3AH battery can store ten times less energy than a 12V 3AH battery for example).

    If I make some assumptions, then your goal is possibly unrealistic. 3-4AH at a sufficiently high voltage to make something that consumes 48W, or even half that, for any reasonable amount of time (guessing an hour or longer?) is a large enough capacity to not be a typical off-the-shelf rechargeable battery. A custom one-off battery pack isn't feasible without some experience in building and charging multi-cell batteries, and could be dangerous.

    The easiest way to find a battery is to go to a distributor website and type in your desired max width in the parameters selection box. I did that at farnell.com and this is the result: http://uk.farnell.com/w/c/batteries-chargers/batteries-rechargeable?external-width=20mm|25mm&st=12v+battery

    Just one 12V battery there slightly begins to approach the requirement, but has a 2AH rating.

    Since you require 12V and 15V, one approach could be to select a 12V rechargeable battery, since it will directly be able to power one of your components (use a fuse in-line). For the 15V device, you could use a 'boost converter' or 'DC-DC converter', such as this one:

    JCK2012S15 XP POWER, Isolated Board Mount DC/DC Converter, 2:1 Input, 1 Output, 20 W, 15 V, 1.33 A | Farnell element14

    It will convert a 12V supply to a 15V one, at up to 1.3A which will cover 1.2A peaks. Again, to find these, the parameters can be entered on the distributor website.

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