> From: Michael K Johnson via EV <[email protected]> > > That AH meter at lightobject looks very interesting. It doesn't say > what shunt or range of shunts it can use that I can see. > > I have a buck converter that I can put on my tractor to power the > meter, but obviously I'd need to use a shunt to measure current. I > have a 50mV/500A shunt installed; do you have docs to check whether it > would work?
My favourite shunt is the longest battery lead. :-) Why drop any more voltage than you already are dropping? But you need a system that can be calibrated. If your longest lead drops at least 50 mV, you can put a trimpot across it to bring it down to exactly 50 mV. I've done this on two different "house battery" systems for campers, and it worked well. I put an "amp clamp" meter on the cable, together with a constant load (turning all the lights on in the camper works well), then trimming the pot until the readings were the same. Jan > On Wed, May 14, 2014 at 12:21 AM, John Lussmyer via EV > <[email protected]> wrote: >> On Tue May 13 21:11:33 PDT 2014 [email protected] said: >>> Thanks, Denis. >>> >>> It looks like a pretty simple display. I'm sorta hoping for something with >>> more numbers on it. There seem to be a number of units on eBay that only go >>> to 100 V and 30 A: >>> http://www.ebay.ca/itm/5-in-1-Digital-Combo-Panel-Meter-DC100V30A-Volt-Amp-kWh-Watt-Working-Time-/181403417248?pt=LH_DefaultDomain_2&hash=item2a3c7c7aa0&_uhb=1 >>> >>> but I'm hoping for something more like this that will do 196V and up to 500 >>> A: >>> http://www.accuenergy.com/?discography=acudc-240-series >>> >>> This unit could display volts, amps, and kWH simultaneously, but I haven't >>> found a supplier nor even a price! >> >> I'm going to try one of these: >> http://www.lightobject.com/Programmable-Digital-AH-meter-Ideal-for-battery-monitoring-P278.aspx >> >> I have it on my desk, but haven't hooked it up to anything yet. >> >> >> -- >> >> Try my Sensible Email package! >> https://sourceforge.net/projects/sensibleemail/ >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA >> (http://groups.yahoo.com/group/NEDRA) >> > :::: It is only the great men who are truly obscene. If they had notdared to be obscene, they could never have dared to be great. -- Havelock Ellis :::: Jan Steinman, EcoReality Co-op :::: _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
