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267 posts

Ultimate Geek


#191834 17-Feb-2016 20:29
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Hi Guys, Long time no post!

I have started a new project to build a DIY stereo I can take camping that will run off battery.

I have drawn up a quick schematic of off the shelf parts I have collected but my electrical expertise is not up there with most of you so I am hoping someone can put some eyes over this and advise on if this will work or if any changes should be made.

The components:
12V SLA Batteries
16V Mains Transformer
Volt/Amp Meter - This has wires for power source, voltage reading and load wire to measure amps
PicoUPS - Connections for Battery, V-In, V-Out (This basically switches between battery and mains 16V source and charges that batteries at the same time)
Power Regulator - Has V-In (6-36V) and V-Out (12V) This is to regulate the voltage output of the PicoUPS as it has no voltage regulator built in
12V-USB Transformer - Takes 12v input and outputs to female USB connectors to charge USB devices (has own transformer)
12V Amplifier - To power speakers - Has required inputs volume control etc.

Here is my drawn circuit diagram:

 

 

I am wanting the Volt/Amp meter to measure the total current of the circuit and voltage of the battery but realised after drawing this, the way it is currently wired will only measure the current when running off battery and will read 0 when running of Mains Transformer - My solution would be to wire the Load wire to the output of the PicoUPS unit but then I will have no way to tell how much current that device is drawing.

This is the type of meter in question: http://diyprojects.eu/how-to-wire-digital-dual-display-volt-and-ammeter/






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  #1494424 17-Feb-2016 21:56
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I did this in the old flatting days for taking away during new year holidays.
It went like this...
2x12V battery (small ones from a UPS, wired in parallel)
Car Stereo (cheap as. Had a line input for mp3 players)
Cheap as 6" car speakers
12V solar car battery charger from super cheap auto (maybe $30 max)

Wired it all together in a box and had endless music. Only used it one summer so not sure how long the batteries would have lasted being charged by the solar charger. But was fine for a few weeks.

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Ultimate Geek

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  #1494425 17-Feb-2016 21:57
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I think that you are trying to do to much with that meter. If you want to measure the circuit current the meter should be after the regulator.
You should also have a fuse on the battery output and what will stop the battery being overcharged.

 
 
 
 




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Ultimate Geek


  #1494430 17-Feb-2016 22:00
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The PicoUPS unit has a built in fuse so I didnt think I needed a fuse on the batteries but I guess it will help save if there is a shortcut on the battery end.

 

I know it's a bit more complicated than a plain old car stereo but I like things I can piece together.






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Ultimate Geek

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  #1494435 17-Feb-2016 22:05
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What do you want to measure? If it is the battery voltage and the circuit current then a combined unit will not work unless it has separate voltage and current inputs.



267 posts

Ultimate Geek


  #1494438 17-Feb-2016 22:10
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The meter is  dual display type with Volts and Amps. It has Voltage input for powering the display and 3 addition pins which are +, - and Load.

 

The idea is to measure the battery voltage and current being drawn from the batteries. I thought connecting it as above will do this for me.

 

The fuse block has 6 fuses so I can add a fuse between the batteries before anything else without too much trouble.






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  #1494441 17-Feb-2016 22:14
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That will work fine, but as you say it will not measure circuit current when mains supply is used, although it will measure battery charging current.



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Ultimate Geek


  #1494443 17-Feb-2016 22:17
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Ahh yes I didnt think about measuring charging current - That is a bonus as I will be able to tell the charge state of the batteries while charging also.

 

I have 10Amp fuses at the moment - Would you think they will be too large for this project?

 

I estimate this drawing no more than 2Amps.

 

Also im keen to know if you see any no no's in what ive done or potential problems :)






 
 
 
 


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Ultimate Geek

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  #1494449 17-Feb-2016 22:30
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10A is probably OK if you are only worried about protecting against short circuit. What are the current ratings of the UPS and the regulator, you want to make sure you don't overload them.




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Ultimate Geek


  #1494451 17-Feb-2016 22:34
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The ups is rated at 10 amps and the regulator 15.

The usb transformer and amp not 100% sure





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  #1494454 17-Feb-2016 22:42
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In that case I wouldn't fuse the outputs individually. I would just have 1 x 10A fuse supplying both outputs. You don't want to cook the UPS.


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  #1494475 17-Feb-2016 22:58
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Best advertise the camp you will be at so we can make sure we won't be anywhere near you!




267 posts

Ultimate Geek


  #1494584 18-Feb-2016 08:11
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linw:

 

Best advertise the camp you will be at so we can make sure we won't be anywhere near you!

 

 

Hehe I dont do loud listening outside my home :) will be for background music pretty much. not built for loudness :)






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  #1494587 18-Feb-2016 08:14
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We took a cheap waterproof Bluetooth speaker.  Worked well ;)


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  #1494621 18-Feb-2016 09:07
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Jaxson:

 

We took a cheap waterproof Bluetooth speaker.  Worked well ;)

 

 

Unless you're really bored, then this :) And a solar charger :)

 

 





XPD^ / DemiseNZ

 

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