Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


251 posts

Ultimate Geek
+1 received by user: 11


Topic # 191834 17-Feb-2016 20:29
Send private message

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/






Create new topic
3591 posts

Uber Geek
+1 received by user: 1320

Subscriber

  Reply # 1494424 17-Feb-2016 21:56
Send private message

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.

165 posts

Master Geek
+1 received by user: 45

Subscriber

  Reply # 1494425 17-Feb-2016 21:57
Send private message

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.



251 posts

Ultimate Geek
+1 received by user: 11


  Reply # 1494430 17-Feb-2016 22:00
Send private message

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.






165 posts

Master Geek
+1 received by user: 45

Subscriber

  Reply # 1494435 17-Feb-2016 22:05
Send private message

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.



251 posts

Ultimate Geek
+1 received by user: 11


  Reply # 1494438 17-Feb-2016 22:10
Send private message

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.






165 posts

Master Geek
+1 received by user: 45

Subscriber

  Reply # 1494441 17-Feb-2016 22:14
Send private message

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.



251 posts

Ultimate Geek
+1 received by user: 11


  Reply # 1494443 17-Feb-2016 22:17
Send private message

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 :)






165 posts

Master Geek
+1 received by user: 45

Subscriber

  Reply # 1494449 17-Feb-2016 22:30
Send private message

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.




251 posts

Ultimate Geek
+1 received by user: 11


  Reply # 1494451 17-Feb-2016 22:34
Send private message

The ups is rated at 10 amps and the regulator 15.

The usb transformer and amp not 100% sure





165 posts

Master Geek
+1 received by user: 45

Subscriber

  Reply # 1494454 17-Feb-2016 22:42
Send private message

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.


1916 posts

Uber Geek
+1 received by user: 374

Subscriber

  Reply # 1494475 17-Feb-2016 22:58
3 people support this post
Send private message

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




251 posts

Ultimate Geek
+1 received by user: 11


  Reply # 1494584 18-Feb-2016 08:11
One person supports this post
Send private message

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 :)






6725 posts

Uber Geek
+1 received by user: 592

Trusted

  Reply # 1494587 18-Feb-2016 08:14
One person supports this post
Send private message

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


xpd

Chief Trash Bandit
8984 posts

Uber Geek
+1 received by user: 1383

Mod Emeritus
Trusted
Lifetime subscriber

  Reply # 1494621 18-Feb-2016 09:07
Send private message

Jaxson:

 

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

 

 

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

 

 





XPD / Gavin / DemiseNZ

 

For Free Games, Geekiness and Reviews, visit :

 

Home Of The Overrated Raccoons

 

Battlenet : XPD#11535    Origin/Steam/Epic/Uplay : xpdnz


Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.