I would be very happy to have a 20A 100mv shunt in your DIN package. The
Traco BCMU360 is only rated for 240W continuous. 240/12 = 20A. I will
typically only load them up with no more than 220-225W, since I'm using
Mean Well SDR-240-48's, so I still need 10-15 watts for battery
charging. If I have a site that outgrows 220W, then I'm gonna be looking
at a rectifier shelf like the ICT 1U modular that has all the bells and
whistles.
On 8/30/2017 3:16 PM, Forrest Christian (List Account) wrote:
The challenge with higher current shunts is how much power is
dissipated by the shunt. A 20A shunt at maximum will dissipate
(waste) around 2 watts. I know this doesn't sound like a lot, but
when you're talking a tiny device on a circuit board, it is.
I've recently redesigned the shunts and currently have a couple under
test. The new shunt has a connector suitable for over 10A (the old
was rated for 12), and am hopeful that I can get 20A to work, but the
first try didn't go so well, unless you like melted mounting hardware.
(The good news is the shunt electronics survived just fine). I've
changed resistive elements and plan on using them for 10A and 20A
models but am waiting for everything to come in to test in the next
day or two. If you've got a 10A shunt order on backorder with us
this is why.
The other thing I continue to mention is that shunts above 10A are
relatively easy to come by or as Chuck points out, make. (Google 20A
100mV as an example of buy). I know they're not on a din track - and
I'm aware of the form factor desire to have them on the DIN rail
On Wed, Aug 30, 2017 at 11:29 AM, George Skorup
<[email protected] <mailto:[email protected]>> wrote:
Yeah, about that. I wouldn't use those on 12VDC systems. Too much
current. I've burned up a couple of the 10A shunts on Traco BCMUs
that were running around 200W load on battery. 200/13 = 15 amps.
Ungood. One site at about 225W, first time it went to battery, the
shunt went kaput after 10-15 minutes and the site went down.
I'm hoping Forrest comes up with some Hall effect stuff or even
plain 20+ amp shunts that can be used on the SiteMonitor's
existing 100mv input. Hall effect is nice because you don't have
to be "in" the circuit. But I'll take what I can get.
On 8/30/2017 10:26 AM, Adam Moffett wrote:
Yeah, up to 10 amp.
------ Original Message ------
From: "Chuck McCown" <[email protected] <mailto:[email protected]>>
To: [email protected] <mailto:[email protected]>
Sent: 8/30/2017 11:18:36 AM
Subject: Re: [AFMUG] Cost effective battery charging and
monitoring device
I think Forrest has them on his site with the site monitors.
*From:* Sam Lambie
*Sent:* Wednesday, August 30, 2017 9:15 AM
*To:* [email protected]
*Subject:* Re: [AFMUG] Cost effective battery charging and
monitoring device
Parallel. Site Monitor! Now where can I get a shunt?
On Wed, Aug 30, 2017 at 9:09 AM, Chuck McCown <[email protected]>
wrote:
4 batts in series or parallel?
Shunt + sitemonitor would be a better way to go and you
don’t have to write code.
*From:* Sam Lambie
*Sent:* Wednesday, August 30, 2017 9:06 AM
*To:* [email protected]
*Subject:* [AFMUG] Cost effective battery charging and
monitoring device
Hey all,
I am getting away from using APC at a couple of our sites
and right now I have installed a Tripp-Lite APS750 connected
to 4 Deep cycle marine batteries for a total of 404 aH
system. I'd like to be able to monitor the discharge rate of
the batteries when power is out remotely. What have you guys
been doing to that effect?
I'm thinking a Pi and a shunt and some quick scripting
classes on Python to put it all together...
--
--
*Sam Lambie*
Taosnet Wireless Tech.
575-758-7598 <tel:%28575%29%20758-7598> Office
www.Taosnet.com <http://www.newmex.com>
--
--
*Sam Lambie*
Taosnet Wireless Tech.
575-758-7598 <tel:%28575%29%20758-7598> Office
www.Taosnet.com <http://www.newmex.com>
--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
[email protected] <mailto:[email protected]> |
http://www.packetflux.com <http://www.packetflux.com/>
<http://www.linkedin.com/in/fwchristian>
<http://facebook.com/packetflux> <http://twitter.com/@packetflux>
