[RE-wrenches] Looking for TM500 shunt board

[Howie Michaelson]

Luke,

Don't know if you found your 48v shunt, but I've been meaning to mention
that if you are using the TM500 in a 48v system along with a C40 Charge
controller, you may run into charging problems.  My memory from many years
ago was that the shunt board set up some noise on the DC bus that confused
the C40 and it stopped charging.  This was a problem that Xantrex only
finally admitted to after 1 1/2 years of traveling to a remote site to
figure out why the clients system was not getting an appropriate amount of
solar gain and talking to about every tech and engineer that I could get
through to.  It was the final straw in my decision to never use Xantrex
equipment again - not that they had a problem, but that they would not
admit it to me until I wasted enormous amounts of time going back and
forth, finally getting some low level tech to tell me that the issue was
identified some 6 months earlier.  To date they have never issued a tech
note on this.  The TM500 is a bastardization of the Trimetric, and I was
told that Xantrex was warned to not put some of the electronics onto the
shunt, but they decided to do so anyway.  I think that boB or Robyn were
long gone from Xantrex by the time this issue was identified, but I'd be
curious to hear if they knew anything about it...

-- Rant off --
Howie
-- 
Howie Michaelson
NABCEP Certified Solar PV Installer™

Catamount Solar, LLC
Renewable Energy Systems Sales and Service
VT Solar Electric & Hot Water Incentive Partner
http://www.CatamountSolar.com
802-272-0004


On Thu, November 29, 2012 4:47 pm, Luke Christy wrote:
> Hi Folks,
> I have an old Xantrex TM500 energy meter that I'm repurposing for a
> personal PV project. The unit was originally set up with the TM48 48v
> adapter/shunt board (This thing has an RJ-11 connector for the comm cable
> to the TM500 and screws directly to the kelvin terminals on a 500A shunt).
> The 48V shunt board went bad, which is why I ended up with the TM500 unit,
> but that's ok because I need it to work with a 24V system now. The
> low-voltage shunt  board for 12 and 24V systems was smaller and simpler
> (as far as I can tell), but I haven't been able to find one anywhere.
> Anyone out there have an old low-voltage shunt board that you want to
> sell? If so please contact me off-list.
> Thanks.
>
> Luke Christy
>
> NABCEP Certified PV Installer™: Certification #031409-25
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