But if you have the correct ohm resistance of the shunt? Your monitoring device should have a setting for that? With the ohm reading, it should be pretty accurate.
I'm using one of those shunt (150A 20$) on my electric bike and I get the same amp draw reading on my fluke meter. Max I draw is 65A or 4kW so that's higher than most wisp battery backup system. That's my fuel gauge so it needs to be pretty accurate. Here's the meter I use on my bike , no network connection but serial data output and the monitoring of amp, watts, voltage and AH used is there. www.ebikes.ca/product-info/cycle-analyst.html Le mar. 5 sept. 2017 à 18:53, Chuck McCown <[email protected]> a écrit : > The higher the amperage the shunt, the less precision you get from the > system. > > *From:* Charles Regan > *Sent:* Tuesday, September 05, 2017 3:52 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Cost effective battery charging and monitoring > device > Why just change the shunt for one like this? That's a 600A shunt. 45$ > > Deltec 600A Ammeter Shunt > http://www.electricmotorsport.com/deltec-600a-ammeter-shunt.html > > Le mer. 30 août 2017 à 14:29, George Skorup <[email protected]> a > écrit : > >> Yeah, about that. I wouldn't use those on 12VDC systems. Too much >> current. I've burned up a couple of the 10A shunts on Traco BCMUs that were >> running around 200W load on battery. 200/13 = 15 amps. Ungood. One site at >> about 225W, first time it went to battery, the shunt went kaput after 10-15 >> minutes and the site went down. >> >> I'm hoping Forrest comes up with some Hall effect stuff or even plain 20+ >> amp shunts that can be used on the SiteMonitor's existing 100mv input. Hall >> effect is nice because you don't have to be "in" the circuit. But I'll take >> what I can get. >> >> >> On 8/30/2017 10:26 AM, Adam Moffett wrote: >> >> Yeah, up to 10 amp. >> >> >> ------ Original Message ------ >> From: "Chuck McCown" <[email protected]> >> To: [email protected] >> Sent: 8/30/2017 11:18:36 AM >> >> Subject: Re: [AFMUG] Cost effective battery charging and monitoring device >> >> >> I think Forrest has them on his site with the site monitors. >> >> *From:* Sam Lambie >> *Sent:* Wednesday, August 30, 2017 9:15 AM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] Cost effective battery charging and monitoring >> device >> >> Parallel. Site Monitor! Now where can I get a shunt? >> >> On Wed, Aug 30, 2017 at 9:09 AM, Chuck McCown <[email protected]> wrote: >> >>> 4 batts in series or parallel? >>> Shunt + sitemonitor would be a better way to go and you don’t have to >>> write code. >>> >>> *From:* Sam Lambie >>> *Sent:* Wednesday, August 30, 2017 9:06 AM >>> *To:* [email protected] >>> *Subject:* [AFMUG] Cost effective battery charging and monitoring device >>> >>> Hey all, >>> I am getting away from using APC at a couple of our sites and right now >>> I have installed a Tripp-Lite APS750 connected to 4 Deep cycle marine >>> batteries for a total of 404 aH system. I'd like to be able to monitor the >>> discharge rate of the batteries when power is out remotely. What have you >>> guys been doing to that effect? >>> >>> I'm thinking a Pi and a shunt and some quick scripting classes on Python >>> to put it all together... >>> >>> -- >>> -- >>> *Sam Lambie* >>> Taosnet Wireless Tech. >>> 575-758-7598 <%28575%29%20758-7598> Office >>> www.Taosnet.com <http://www.newmex.com> >>> >> >> >> >> -- >> -- >> *Sam Lambie* >> Taosnet Wireless Tech. >> 575-758-7598 Office >> www.Taosnet.com <http://www.newmex.com> >> >>
