All we've ever bought are the 10A version. They read accurate enough to
see when a 1/2 or 1A DC-UPS is charging as well as 3-7A the other
direction when the load is running on battery. Typical 24 and 48VDC
systems with <200W load. And then me not paying attention with the Traco
BCMU's 12VDC. Using the 2-relay/3-switch module, remotely I could see
that the "Batt OK" contact was open after power came back up at the site
at like 4am and still open around 8am. Since the site went down sooner
than expected, I figured either the battery fuse on the BCM blew or it
was sensing some other issue. So I get there and put my clamp-on ammeter
on it and zero current. Two fused 20AH batteries in parallel both
sitting at 13.1 volts. OK, WTF. Then it all made sense with the shunt.
Another thought I had is... what about Hall effect sensors? Could you do
a module for that? That would be pretty cool.
On 6/16/2017 11:00 AM, Forrest Christian (List Account) wrote:
There will likely be a 20A shunt in our future. I'm in the process
of redesigning these so that they're less expensive to build since the
existing design is being sold at or possibly below cost. I'm trying
to end up with a 20A shunt as a result but I don't know for sure if
this will happen.
On Jun 15, 2017 5:47 PM, "George Skorup" <george.sko...@cbcast.com
<mailto:george.sko...@cbcast.com>> wrote:
Forrest,
Would you be willing to make a 20A shunt? Would the traces on your
current design handle it?
Reason I'm asking is... I'm stupid. I had a 10A shunt on the batt
negative side of a Traco BCMU360. Didn't occur to me that 230
watts @ ~12VDC can get up to 20A. So the shunt went kaput after
about 25 minutes and the site went down. Not a problem at most
other sites with less load. This one happens to be the most
heavily loaded with two Trango ApexPlus, various APs and PTPs plus
the DC-DC inefficiencies.
