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Recommendations for 60V 20+A DC power supply to test RC brushless motors?

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zrq:
What about mobile base station "rectifier module"s .

In the part of world I was in few years ago, Emerson R48-2900U was very common in second-hand market and I clearly recall there was a tutorial about how to mod them to make them output 60V. The annoyance with this specific model is it have a soft start feature than ramps up the output to set point in a minute, not sure if it can be disabled or not. There should be some newer models can be modded without this problem and have even higher power density.

james_s:
Actually there are a lot of those telecom rectifiers out there, they're very similar to scaled up server PSUs and with a default of 48V they're pretty close. There might be enough range to just dial one up to 55V without hitting the OVP.

thm_w:

--- Quote from: james_s on October 28, 2022, 11:44:42 pm ---
--- Quote from: thm_w on October 28, 2022, 10:58:28 pm ---Ah I see yes if the chassis is no longer grounded. I would not want to do that, if possible, keep the chassis grounded and just disconnect the output.
In some cases this can be done. There is a plugpack that I use where they run a green earthing wire from the mains in to output, if you cut that the output is now floating safely.

--- End quote ---

Huh? Says who? I lift the DC ground from the chassis, I don't lift the earth ground. The chassis stays safely grounded, only the output is now floating.

--- End quote ---

Above, as I said, I would do as you recommend, keep the chassis earthed.


--- Quote from: nctnico on October 28, 2022, 11:23:14 pm ---I'd look for a brand called 'Gophert'. They make a whole range of switching power supplies that are low cost, are of reasonable quality and should cover this application. Likely the (ab)use of old telecom / server power supplies is even more expensive.

--- End quote ---

Two of these: https://www.aliexpress.us/item/3256803507137876.html $450.
Don't know where the spec for o/p to ground max voltage is.

nctnico:

--- Quote from: thm_w on October 29, 2022, 12:41:36 am ---
--- Quote from: nctnico on October 28, 2022, 11:23:14 pm ---I'd look for a brand called 'Gophert'. They make a whole range of switching power supplies that are low cost, are of reasonable quality and should cover this application. Likely the (ab)use of old telecom / server power supplies is even more expensive.

--- End quote ---

Two of these: https://www.aliexpress.us/item/3256803507137876.html $450.
Don't know where the spec for o/p to ground max voltage is.

--- End quote ---
60V DC shouldn't be a problem. At least these PSUs are designed with floating outputs, current limiting and adjustable output voltage.

This one looks closer to what the OP is looking for in a single box: https://aliexpress.com/item/4000352693776.html

LCA078:
You guys are great- I love the responses and bickering.  Reminds me of my younger days when I repaired military avionics and listened to the Chiefs going back and forth with each other on how to  troubleshoot aircraft.  I miss having a well equipped bench like I did back then.  Now it's just a folding table in my garage with DMM's.  Not even a cheap scope.   :palm: 

For this project I was hoping to find something like an older, but good name, power supply on ebay but no dice.  And yes, I don't mind hacking something together but just prefer to buy off the shelf if easier.  And also much safer than using 3 automotive batteries in series without fuses...  :scared: 


--- Quote from: nctnico on October 29, 2022, 12:47:41 am ---
This one looks closer to what the OP is looking for in a single box: https://aliexpress.com/item/4000352693776.html

--- End quote ---

Yes!  That's what I was hoping for- a simple PSU.  Hopefully it's fairly clean on the output.  Looks pretty solid.


--- Quote from: thm_w on October 28, 2022, 10:35:23 pm ---
Heres a wanptek 60V 20A for $200: https://www.aliexpress.us/item/3256801282757612.html
Quality unknown. This person never reviewed theirs: https://www.eevblog.com/forum/testgear/wanptek-kps-series-power-supplies/

--- End quote ---

I saw this one in a video  before I posted my first post.  It looks like it's doing a decent job so I wondered if there are other PSU's out there for a bit more $ but much better on quality.  The Gophert looks pretty nice with the extruded aluminum case.

Hmmm... might be worth it to buy one of each and see how they do. 

 

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