SMPS Seems to have excessive voltage drop and voltage fluctuations Riden RD6018

[ThermallyFrigid]

I just received an NVVV SMPS S-600-60. 600watts and 60v

I installed it into a Riden RD6018W

The unloaded voltage fluctuates from about 60.1 to 62.1 with nothing connected.  I tested another power supply in this same Riden unit and there is no such fluctuation so it is the NVVV PSU

Also, when I put a 1amp load on the NVVV power supply there is a voltage drop of nearly 8% from 61v to sometimes as much as 53v.  it fluctuates.

Since none of my other power supplies do this and are basically rock solid at a steady unloaded voltage and have very little voltage drop a light loads, I assume this is a defective power supply.

Is this a reasonable assumption?

Thanks

[T3sl4co1l]

Whazzat, the ~$40 PSU from Amazon?  I see a few hits like that at least, random brands, price way too low.

If it's actually capable of nameplate rating (or functional at all), it's probably not great.  Who knows how noisy it is.  I'd at the very least want to inspect it in detail, for HV clearance, component ratings, noise output, operating range, etc.

How about a nice brand name MeanWell or the like?

The RD6018 thing probably isn't all that quiet either... no idea, would have to test.  None of these things have any meaningful test data; if they have any regulatory symbols, I expect they're decorative only...

Tim

[ThermallyFrigid]

Anyone know if those numbers I posted sound right for a good SMPS ?

[T3sl4co1l]

No.

I can't be sure if you're doing something wrong, or your load is weird or something, but those don't sound correct and you are right to be suspicious.  Hence the conclusion implied by my earlier reply.

Tim