Why does the WS-8-150-DC require battery power?

[bpnz]

I’ve got quite a few Netonix switches but have never deployed a WS-8-150-DC.

When reading the webpage it states it needs to be run via a battery bank and not a power supply. The installation I’m looking at installing these in will require three of them and it’ll be easier to use a DC run at 48v than an AC run.

However if it says not to use it on a power supply there must be a reason?

It also says “ If you have a 48V-54V power supply you should use the WS-12-DC unit.” Yet the switch says it supports 9v-70v.

So what’s the reasoning? I’d rather know so I don’t break anything!!

https://netonix.com/ws-8-150-dc.html

[mike99]

Model with smart power supply are design to be hooked to a batteries bank. If you want to use an external power supply, use a model without smart power supply, so without watts in the name.

Exemple
WS-12-DC can be hook up to external PS
WS-12-250-DC shouldn't be hooked to external PS

[bpnz]

Thanks, but I guess what I’m wondering is what makes the power from a power supply different to that from a battery?

Ok after a bit more looking through the forums (painful on my cellphone) it looks like the reason is to do with inrush current when using a power supply being greater than the power supply can handle. Whereas a battery would be better cushioned against it.

[Dave]

correct

[bchur83]

I have seen the inrush issue with the DC switches and then do really need a battery for that initial current draw. I have a 20A 48V power supply and it would trip overload when I directly connected a Netonix DC switch, but with a battery in the middle, it would do just fine. You could possibly rig up some sort of soft start circuit and it may work but they draw a lot on initial power on loading the capacitors on the power supply.

[Dave]

I will ponder on making new iterations of DC_DC units possibly use lower inrush current....

[KBrownConsulting]

Sorry to revive a bit of an old thread but I just purchased a used WS-12-DC, only the person selling the switch had it mislabeled so I actually received a WS-12-250-DC...

Problem is I was planning to use an AC to DC power supply, not a battery to power the switch.

I'm looking for opinions:

Could I safely use something like this: DC 12V 24V 36V 48V Soft Start Reversible Motor Speed Control PWM Controller if I was to eliminate the toggle switch to eliminate the possibility of accidentally reversing the polarity?

Thoughts? Other cheap solutions or suggestions?

Thanks


Update: In this thread: AC to DC power supply for WS-12-250-DC someone says they have had success running the WS-12-250-DC off Meanwell SDR-240-24 and SDR-240-48... Anyone else had any experience or thoughts on that? Any thoughts on the cheaper NDR-240-24?

Thanks again.