Greetings, all~ Regarding Allan's shunt question: Definitely you will need the same "ratio" for the meter logic to work right.
I have purchased from AEE Solar a 1000 amp shunt that drops 100 mv @ 1000 amps. This is the same "ratio" as a shunt that drops 50mv @ 500 amps. The photo makes this appear to be just a block of metal with no insulating base but I confirmed and found that it did arrive on a plastic base. I had to do some major mods to fit this into the Schneider XW "power distribution panel" because the overall height and other dimensions are different, but it worked out. I do not recall the part number for this but the AEEsolar website has a pretty good search function. Allan, you may contact me off list as always if I may assist further. Jolliness, Mick Abraham, Proprietor www.abrahamsolar.com Voice: 970-731-4675 > 1. Shunt question (Allan Sindelar) > > > ---------- Forwarded message ---------- > From: Allan Sindelar <al...@positiveenergysolar.com> > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > Cc: > Date: Tue, 31 Jul 2012 07:37:55 -0600 > Subject: [RE-wrenches] Shunt question > Wrenches, > What are you using when you need a shunt larger than the standard > 500A/50mV? > > The application: four Sunny Islands and a Radian in a large grid-tie with > backup system. Total current flow through B- is rated 850A (using 125A SI > DC breakers) or 1,050A (using 175A DC breakers) on a single large battery > bank. Given uncertain continuous amperage, I should use a 1,000A shunt or > even a 1,200A shunt, as Deltec recommends never exceeding 67% of a shunt's > current rating for long. Deltec makes both; see > http://www.deltecco.com/MKC-DC.html. The shunt will be installed inside > of a Nottagutter-8, with a Midnite shunt bus on each side. The shunt will > be used with the Sunny Island master to control overall SOC and charging > parameters; there's no plan for a Tri-Metric in this system, as a Sunny > Webbox will handle online monitoring per the customer's wishes. > > The 1,000 and 1,200A series MKC Deltec shunts are the same physical > dimensions as the common 500A/50mV units. However, the larger units are > still 50mV. Ralph Heisey of Bogart Engineering, in his "Information on > Shunts" reference article (http://www.deltecco.com/MKC-DC.html), tells us > to match the ratio of voltage drop to current - that is, just as a 500A > shunt drops 50mV, a larger shunt with 1,000A flowing through it should drop > 100mV. But all of the larger Deltec shunts are still rated 50mV. > > Who has done this and resolved the issue? What shunt did you use? > > Thank you, > Allan > -- > *Allan Sindelar* > *al...@positiveenergysolar.com* <al...@positiveenergysolar.com> > NABCEP Certified Photovoltaic Installer > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > Founder and Chief Technology Officer > *Positive Energy, Inc.* > 3209 Richards Lane (note new address) > Santa Fe, New Mexico 87507 > *505 424-1112* > *www.positiveenergysolar.com* <http://www.positiveenergysolar.com/> > > * > * >
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