If you need any 48V in your application, you are better off using that
as your base voltage and converting to 24V as needed. 48V-24V converters
are much easier to come by, and the current draw on 48V will be half
what it is on 24V (assuming the same power levels).
bp
<part15sbs{at}gmail{dot}com>
On 1/29/2018 1:40 PM, Mathew Howard wrote:
Yeah, the lack of a 48v version of the DR-UPS was one of the problems
I ran into too... my fix was to use a 24v to 48v DC converter. Pretty
much every site ends up needing both 48v and 24v anyway, so unless you
do a complete DC plant for each voltage, you're going to end up
needing some kind of a converter one way or the other anyhow, and that
way you can do two batteries instead of four. Only problem being I
haven't found a nice DIN rail 24v-48v converter (the meanwell one does
the job fine, it's just not a proper DIN mount device).
So the way I'm leaning for new sites is to do a nice big Meanwell DIN
mount 24v power supply, with a DR-UPS and and a 24v to 48v DC
converter, connected to two PacketFlux PDUs (one for 48v and one for
24v). That gives me five remotely controllable power outputs for each
voltage that I can use to power whatever routers, switches, PoE
injectors, or whatever I need. And there are contacts on those power
supplies that can be connected to the Packetflux Base for monitoring
purposes.
Might be able to do things a bit more cleanly with a Rackinjector
too... I haven't had time to play with that much yet though.
On Mon, Jan 29, 2018 at 9:32 AM, Josh Baird <[email protected]
<mailto:[email protected]>> wrote:
Yeah - the lack of a 48VDC UPS from Meanwell is annoying. For
small-ish sites, we have been running a Meanwell/Traco hybrid
using the SDR-240-48 and a Traco TSP-BCM48A or BCMU360.
On Mon, Jan 29, 2018 at 10:29 AM, Adam Moffett
<[email protected] <mailto:[email protected]>> wrote:
There's a lot to like about that setup. The DR-UPS can do
40amp on 24v, so your upper limit is almost 1kW. Just drive
it with a bigger 24v supply as needed.
What has held me back from that in the past is the DR-UPS is
not available in 48v, and the biggest power consumers I have
are 48V. I went to Traco to stay 48V. OTOH your rig is so
much cheaper than Traco that adding an RSD-300B-48 for another
$100 is not a bad deal.
------ Original Message ------
From: "David Coudron" <[email protected]
<mailto:[email protected]>>
To: "[email protected] <mailto:[email protected]>" <[email protected]
<mailto:[email protected]>>
Sent: 1/28/2018 10:39:56 PM
Subject: Re: [AFMUG] Dc plant conversion
Here is what we are doing, I think this is close to what
Steve is asking for:
Meanwell SDR-240-24 AC to DC power source: $84
Meanwell DR-UPS40 Battery Float/UPS: $37
Tycon TPDIN MonitorWeb2: $131
24 V of battery backup $70-120 depending on the runtime
looking for
Netonix 150 W or 250 DC switch: $250-350 (This is really
the only expensive component)
Heater: $65
Fan: $14
With this, we can run 5-8 hours on very small batteries, we
figure we have several hours to get a generator to the site
if power isn’t coming back. We run all POE from the
Netonix, it works really well. Here are the other things we
can do with the box:
1. Monitor temp in the cabinet
2. Monitor/alert on loss of AC line power through TP DIN
3. Monitor voltage of the batteries
4. Monitor voltage to the Netonix
5. Monitor Current to the Netonix
6. Monitor Current in/out of the batteries
7. Auto start the heater below 40 degrees
8. Auto start the fan above 80 degrees
9. Power cycle the netonix from the TP DIN
10. Power cycle any AP, Router, Backhaul from the Netonix
We also put a Mikrotik router in this cabinet. Usually a Hex
POE (for small sites) or a 3011 for larger sites.
We have 13 in the field set up like this and are going 15
more right now. While it might be a little more than what
you were thinking, it gives us a ton of control for pretty
minimal investment per site.
Best part is, no coding necessary. Doing all this with the
Monitor Web2 settings and/or SNMP. Let me know if you are
interested in pictures. For this second batch we have
started using Terminal blocks to clean up the wiring, the
cabinets look a little better, but we went to a smaller poly
cabinet that makes things a little tight.
Regards,
David Coudron
*From:* Af [mailto:[email protected]
<mailto:[email protected]>] *On Behalf Of *Carl Peterson
*Sent:* Saturday, January 27, 2018 5:39 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Dc plant conversion
You can still do DC-DC off it and then hook up netonix. If I
had to do it now I'd go with the IDC switch. When we did our
design, the idc didn't exist so we just went down to 24V off
of our A and B sides and run a redundant powered 24V bus
which all the netonix switches run on.
I better buy up another batch of Elteks before all y'all buy
them all up. These are mostly decommissioned Sprint/Clearwire
btw.
On Jan 27, 2018, at 1:02 PM, Josh Baird <[email protected]
<mailto:[email protected]>> wrote:
A 12 port version would be nice. Looks like the 26 port
version is $600.
On Sat, Jan 27, 2018 at 12:59 PM, Gino A. Villarini
<[email protected] <mailto:[email protected]>> wrote:
Used to, now with the IDC model is not needed
(isolated dc)…
*From: *Af <[email protected]
<mailto:[email protected]>> on behalf of Josh
Baird <[email protected] <mailto:[email protected]>>
*Reply-To: *"[email protected] <mailto:[email protected]>"
<[email protected] <mailto:[email protected]>>
*Date: *Saturday, January 27, 2018 at 1:51 PM
*To: *"[email protected] <mailto:[email protected]>"
<[email protected] <mailto:[email protected]>>
*Subject: *Re: [AFMUG] Dc plant conversion
Which Netonix are you running at - 48V? Or are you
using an isolated DC/DC converter in between the -48V
rectifier and Netonix?
On Sat, Jan 27, 2018 at 12:49 PM, Gino A. Villarini
<[email protected] <mailto:[email protected]>> wrote:
Refurb/ used Eltek/Valere –48 Rectifier shelf off
Ebay ~$400 + 1 Netonix IDC Switch $400… all
done. You can power 90% of WISP gear
*From: *Af <[email protected]
<mailto:[email protected]>> on behalf of Steve
Jones <[email protected]
<mailto:[email protected]>>
*Reply-To: *"[email protected] <mailto:[email protected]>"
<[email protected] <mailto:[email protected]>>
*Date: *Friday, January 26, 2018 at 9:49 PM
*To: *"[email protected] <mailto:[email protected]>"
<[email protected] <mailto:[email protected]>>
*Subject: *[AFMUG] Dc plant conversion
Any of you folks who know both dc plant and even
more know small wisp budget interested in looking
at our gear and power setup and giving realistic
advice that doesnt have a 10 different 500 dollar
components combined with a full time linux guy
and a full time coder?
Id love you to do it out of the kindness of your
heart, but i do have some advisory busget.
Im just tired of the apc ups waste and super
ghetto runtimes on batteries coupled with having
to accept we are destroying runtimes by letting
the apcs die..... please, somebody, please.
Otherwise i have to go to the facebook groups,
and thats like going to a mikrotik or ubnt forum.
