When looking at power supplies, is it watts or amperage that matters?

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This topic contains 4 replies, has 3 voices, and was last updated by  Ryan 1 year, 1 month ago.

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  • #70024

    Fred Walter
    Participant

    When looking at power supplies, is it watts or amperage that matters?

    I have a MKS Gen L V1.0 and it supports up to 24 VDC. I have a number of 19 VDC laptop power supplies here.

    The recommended power supply for use with a mega+RAMPS 1.4 is 12 VDC at 6 amp = 72 watt.

    Can I use a 19.5 VDC at 4.62 amp = 90 watt power supply with the MKS Gen L V1.0?

    Or does my power supply need to be >= 6 amps?

    #70046

    Jason Dentler
    Participant

    I’m pretty sure the volts need to match exactly. Then, your power supply should at least match the amps required.  More amps is okay.

    1 user thanked author for this post.
    #70080

    Ryan
    Keymaster

    The board can do whatever, but the things you plug into it are going to want either 12V or 24V, using 19V will probably cause you a lot of issues.

    Jason has it right match the volts you need, more amps is okay (nothing gained) less will not work.

    #70123

    Fred Walter
    Participant

    The only things that I’m plugging into the board are stepper motors, and the LCD display, so 19.5 VDC should not hurt anything. The MKS Gen L V1.0 board supports the range 12 VDC to 24 VDC.

    (Unlike the mega+ramps combination, which supports at most 12 VDC unless you remove a diode on the RAMPs board. I found this out the hard way. Anyone want a mega that needs a new voltage regulator?)

    So you’re saying for our purposes (MPCNC, moving steppers) that I need the 6 amps, that 4.62 amps @ 19.5 VDC won’t be enough. What are the symptoms when you don’t have enough amps?

    #70146

    Ryan
    Keymaster

    so 19.5 VDC should not hurt anything. The MKS Gen L V1.0 board

    I have no idea if the LCD will be okay, I would assume the 5V reg will be good enough. I have no experience with voltages over 12V into any boards.

     

    So you’re saying for our purposes (MPCNC, moving steppers) that I need the 6 amps, that 4.62 amps @ 19.5 VDC won’t be enough. What are the symptoms when you don’t have enough amps?

    No. 12V x 5A=60W  is what I recommend for everything including a hot end. 12W would probably be more than enough for a system without a 40W hot end heater. 19.5V x 4.62A = 90W…more than enough.

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