PSU and car battery in parallel

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PSU and car battery in parallel

Postby Bergison » Tue 10. Dec 2013, 21:37

Hi everybody,

some advices in this forum regarding power supply solutions is to connect a car battery in parallel to a psu.

I have two 12V - 40A PSUs: http://r.ebay.com/zPzf45 and planned to power two 12V 30W wiper motors from each psu (four motors total).
As I found out during initial testing, the psu kind of shuts down after some turns of the motor!? :?
After waiting a few minutes, the motor turns again, but not for long. Since the psu was rather cheap, I suspect it to be the problem.

I still have a 60Ah - 320A car battery lying around and was wondering if it might help to use it in parallel with the psu, as suggested some times in this forum.

My questions:
- doesn't the battery overcharge or something with a 40A psu?
- do I have to ground the battery, or is this done via the psu ground?

Thanks for your help and sorry if my questions sound stupid, but I'm a complete noob regarding electrics... :roll:

( This is my project: http://x-sim.de/forum/viewtopic.php?f=37&t=1310 )
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Re: PSU and car battery in parallel

Postby prodigy » Tue 10. Dec 2013, 22:09

That's odd, I have run two wipers with one cheap 12v 30A PSU, so you should be running two wipers with even stronger 40A PSU. Does the same thing happens with other PSU?
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Re: PSU and car battery in parallel

Postby Tombo » Tue 10. Dec 2013, 22:20

Without load? I used 15A psu from pc worked for testings. I can recommend you hp dsp 600 pb server powersupply vewry cheap 19,99€ on ebay, easy to mod and i run two wipers with one power supply.
http://www.ebay.de/itm/HP-Server-Netzteil-DPS-600PB-B-fur-DL380-G4-DL385-G1-Grade-A-ESP135-321632-001-/321200103023?pt=PC_Netzteile&hash=item4ac9049e6f
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Re: PSU and car battery in parallel

Postby vicpopo » Tue 10. Dec 2013, 22:50

Hi Bergison,

One of the many discussions about car battery paralell to a psu.
http://www.x-sim.de/forum/viewtopic.php?f=43&t=246&start=120&hilit=Tronicgr+car+battery#p8711

It's surprising if the psu could have problem without load ! Agree with Tombo!
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Re: PSU and car battery in parallel

Postby Bergison » Wed 11. Dec 2013, 22:23

Thanks for your replies! You were right - the psu wasn't the problem! It was the pot and a mistake by myself in the arduino firmware. I was able to repair the pot, it shows its correct position now. But I'm still fighting with the coding of the firmware and asked for help there:
http://x-sim.de/forum/viewtopic.php?f=39&t=723&start=260
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