WS-12-DC input voltage range

[rcosby]

I thought this had been asked somewhere before, but I can't find it.

What is the voltage range on the WS-12-DC? I understand that on the 48V ports input=output. So if I have radios that can handle 60V can I push 60V through it? Will the 24V converter work if I do? What's the lower limit (I thought I read 43V somewhere)?

Thanks!

[sirhc]

You are talking about the WS-12-DC which require 48V conditioned input not the WS-12-250-DC that will accept 9-60V and still power 24V and 48V devices.

It will run on as low as 37V in but will not let you power 48V devices unless you have at least 43V input.

Yes as long as you power it with 37V or more it will condition 24V POE option.

60V is too high of an input for that switch, I think.

I am also thinking we turn off 48V POE option on more than 53V input but I would have to check that.

[rcosby]

Thanks, I'd like to know if there is a 48V poe shutoff on higher voltage. If it is there can it be overridden? Most 48V stuff we use can take 56V.

[sirhc]

Thanks, I'd like to know if there is a 48V poe shutoff on higher voltage. If it is there can it be overridden? Most 48V stuff we use can take 56V.

I am pretty sure that at 60V input you are at the upper limit of what the switch board can deal with and you risk damaging the unit.

I have linked Dave to this thread but I would be careful feeding the WS-12-DC switch 60V as you will damage it.

I am pretty sure 56V would be OK but there is a reason we put a voltage range on the device.

The WS-12-DC spec is 37-53V which is fine, 56V is "probably" OK but I would NOT send it more than that.

[Dave]

i suppose you could use it to around 57 volts, but I would not recommend to do this, as it is getting to close to a lot of the max 60 volt ratings for various components on the board.

but why?

the 57 volt spec you mention is the upper limit of the 802 spec, but rarely does anyone's POE power supply actually output 57 volts, that is just the spec's upper limit. Most POE off the shelf power supplies/adapters will be 50-53 volts.

[rcosby]

Just trying to be as efficient as possible at a 48v solar site. If we can avoid voltage regulators, it saves us some power loss. Sounds like we would be too close to "the edge" at such a site.

[sirhc]

Or you can use the WS-12-250-DC which you can hook directly to your 48V battery bank as the WS-12-250-DC unit can accept 9-60V.

Also by using the WS-12-250-DC unit it will allow you to run your batteries as low as you need to in an emergency but keep in mind if you discharge a battery too low you often need a charger that is capable of 10A per battery to recover but you need to review the battery spec as to needed amperage to recover if discharged below a certain level.

[brock]

We already had a TP-VRHP-2456 (only puts out 60W) appropriate for a low-load tower. After reading this thread I went ahead and hooked it up. Seems to work fine. The DC converter puts out 56.4V according to my multimeter, FWIW. The switch is happy to turn on ports at 48VH.

I'm not worried about it going higher -- in our experience the Tycon converters put out an extremely stable voltage, when we watch on monitoring.

[sirhc]

We already had a TP-VRHP-2456 (only puts out 60W) appropriate for a low-load tower. After reading this thread I went ahead and hooked it up. Seems to work fine. The DC converter puts out 56.4V according to my multimeter, FWIW. The switch is happy to turn on ports at 48VH.

I'm not worried about it going higher -- in our experience the Tycon converters put out an extremely stable voltage, when we watch on monitoring.

You say the Tycon is only 60W, how is this going to be enough current to supply 48VH devices.

Assume an AF24 or AF5 takes 50W and the switch itself uses 10W then your already at capacity of the Tycon?

I would guess you will burn up the Tycon pretty quickly.

It is good practice to drive things at 80% capacity on average if you want them to last so .8 x 60W = 48W

[lligetfa]

Their specsheet lists it as 70W, not 60. Could you run two of them in parallel or the 250W TP-VRHP-2456-5 model?