<p>My Ender 3 has the same connections on the power supply.  As received from the factory, the machine runs off one set (mainboard, bed heat, hotend, and fans) and the other set is left open (I think they're connected inside the power supply).  Given mine is a 300 W rated supply like yours, you should be okay drawing 15 A connected to either V+ and either COM terminal.</p>

CC BY-SA 4.0
2021-07-20T19:21:25.947Z
2021-07-21T18:31:59.090Z
2021-07-21T18:31:59.090Z
Zeiss Ikon
<p>I have recently purchased an SKR 1.4 Turbo which I intend to add to my P3Steel printer. I have an old <a href="https://smile.amazon.co.uk/S-180-12-12V-15A-power-supply/dp/B06XH8S13R" rel="nofollow noreferrer">power supply</a> which appears to have dual outputs [COM COM +V +V]. I want to connect this to the board but the board only has a +V -V connector. The supply is rated at 12 V 15 A which I believe is what is required by the board.</p>
<p>Do I have to connect both +V from the power supply to the +V on the board, and both COM (-V) on the power supply to the -V on the board?</p>
<p>I guess what I'm asking is whether the full 12 V 15 A is only achieved by using both of the outputs together?</p>
<p><a href="https://i.sstatic.net/hNKZE.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/hNKZE.jpg" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2021-07-20T18:25:39.647Z
Is this the manual to your board?
www.roboter-bausatz.de › pdf › BTT-SKR-V1-4-Instruction-Manual
Perry Webb
CC BY-SA 4.0
2021-07-20T18:32:33.680Z
This might give you some technical infomration: https://www.amazon.com/BIGTREETECH-Controller-Compatible-With12864LCD-5TMC2209/dp/B082QYYFVX/ref=pd_bxgy_img_1/140-1784107-2209361?pd_rd_w=rvqDY&pf_rd_p=c64372fa-c41c-422e-990d-9e034f73989b&pf_rd_r=CGXT19MHAGXCPEYRH1W6&pd_rd_r=08e69a2a-9f89-4de4-ab09-a61702d113d4&pd_rd_wg=OM6ih&pd_rd_i=B082QYYFVX&psc=1
Perry Webb
CC BY-SA 4.0
2021-07-20T19:06:45.207Z
It's possible the power supply has both force and sense lines. However, sense lines are usually marked S- and S+.
Perry Webb
CC BY-SA 4.0
2021-07-21T06:19:48.423Z
You'll be fine just using one of the "outputs" - in fact, they're connected right on the PCB, unlike the multiple +12V rails you may find on a computer PSU.
There is no benefit to running both leads, since the connector on the SKR 1.4 T would be the limiting component here.
If you're using an external MOSFET for the bed, you could (and should) use the second set of connectors though to keep wiring tighter and spread the load a bit.
towe
<power-supply><skr-v1.4>
(SKR 1.4 Turbo, TMC2209 Drivers) - Power supply has 4 output, but board only 2 input
raven-king
# (SKR 1.4 Turbo, TMC2209 Drivers) - Power supply has 4 output, but board only 2 input

(Asked by: username_0 on 2021-07-20)

I have recently purchased an SKR 1.4 Turbo which I intend to add to my P3Steel printer. I have an old [power supply](https://smile.amazon.co.uk/S-180-12-12V-15A-power-supply/dp/B06XH8S13R) which appears to have dual outputs [COM COM +V +V]. I want to connect this to the board but the board only has a +V -V connector. The supply is rated at 12 V 15 A which I believe is what is required by the board.

Do I have to connect both +V from the power supply to the +V on the board, and both COM (-V) on the power supply to the -V on the board?

I guess what I'm asking is whether the full 12 V 15 A is only achieved by using both of the outputs together?

[![enter image description here](https://i.sstatic.net/hNKZE.jpg)](https://i.sstatic.net/hNKZE.jpg)

**Tags:** power-supply, skr-v1.4

> **Comments:**
> **username_1**: Is this the manual to your board? www.roboter-bausatz.de › pdf › BTT-SKR-V1-4-Instruction-Manual  
> **username_1**: This might give you some technical infomration: https://www.amazon.com/BIGTREETECH-Controller-Compatible-With12864LCD-5TMC2209/dp/B082QYYFVX/ref=pd_bxgy_img_1/140-1784107-2209361?pd_rd_w=rvqDY&pf_rd_p=c64372fa-c41c-422e-990d-9e034f73989b&pf_rd_r=CGXT19MHAGXCPEYRH1W6&pd_rd_r=08e69a2a-9f89-4de4-ab09-a61702d113d4&pd_rd_wg=OM6ih&pd_rd_i=B082QYYFVX&psc=1  
> **username_1**: It's possible the power supply has both force and sense lines. However, sense lines are usually marked S- and S+.  
> **username_2**: You'll be fine just using one of the "outputs" - in fact, they're connected right on the PCB, unlike the multiple +12V rails you may find on a computer PSU. There is no benefit to running both leads, since the connector on the SKR 1.4 T would be the limiting component here. If you're using an external MOSFET for the bed, you could (and should) use the second set of connectors though to keep wiring tighter and spread the load a bit.  

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## 1 answers

### Answer by username_3 on 2021-07-20. Score: 1

My Ender 3 has the same connections on the power supply. As received from the factory, the machine runs off one set (mainboard, bed heat, hotend, and fans) and the other set is left open (I think they're connected inside the power supply). Given mine is a 300 W rated supply like yours, you should be okay drawing 15 A connected to either V+ and either COM terminal.


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