But what would the typical tolerance be? 10%. So what would be the big
deal if one had 10% more resistance? Effectively an 18A shunt?
bp
<part15sbs{at}gmail{dot}com>
On 6/15/2017 6:07 PM, Chuck McCown wrote:
Assuming they were EXACTLY the same resistance. Otherwise there will
be an uneven division of currents.
I prefer to use #10 wire. 1 foot is .001 ohms. Make your own shunt.
Assuming 20 mV full scale is enough.
20 gauge (which is hard to find) is close to .01 ohms per foot.
However that exceeds the ampacity.
I would be OK with one foot of 14 gauge for a 20 amp shunt. .0025 ohms
per foot. that would give you 50 mV full scale.
Of course this assumes you have the room for and don't mind the look
of a coiled up foot of wire.
-----Original Message----- From: Bill Prince
Sent: Thursday, June 15, 2017 4:55 PM
To: af@afmug.com
Subject: Re: [AFMUG] PacketFlux shunts
This may be a bozo approach, but if you took two 10 amp shunts and
connected them in parallel, you would get a 20 amp shunt out of the deal.
bp
<part15sbs{at}gmail{dot}com>
On 6/15/2017 3:47 PM, George Skorup 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.
