I can make the loads. I like Mtn west but they want too much for the advanced version of the software.
Sent from my iPhone > On Sep 19, 2019, at 6:01 PM, Forrest Christian (List Account) > <li...@packetflux.com> wrote: > > The west mountain radio CBA IV can't really be beat for price and > functionality. > > For around $200, you get a little USB-attached unit which can discharge up to > the lower of 150W or 40A, at a constant current. So you can set the > discharge to the 20 hour rate for a battery, and an app on the PC will will > log and graph. For newer batteries, this almost always matches pretty well > with the datasheet voltage. I use this fairly regularly to verify the > smaller batteries I have around. If you stick with the 20 hour rate @ 12V, > you're good up to around 250AH (250AH at the 20hour rate = 12.5A/150W). > > If you're looking at an entire array you're probably going to need more power > - they have add on 'amplifiers' but they aren't cheap. Another option is to > go get a real DC load with appropriate software. See > https://www.youtube.com/watch?v=8y7mFXD8wII for an example. The rigol > illustrated is good up to 350W, other manufacturers have pretty much any size > you want, if you can afford it. There are also usually a few floating > around ebay of older types, if you can find or write suitable software (i.e. > write a python script to pull the data out at regular intervals). > >> On Thu, Sep 19, 2019 at 7:32 AM Chuck McCown <ch...@wbmfg.com> wrote: >> Discharge and logging. >> >> Sent from my iPhone >> >>> On Sep 18, 2019, at 7:12 PM, Forrest Christian (List Account) >>> <li...@packetflux.com> wrote: >>> >>> Are you talking about doing a discharge test on a battery and logging it? >>> (Aka West Mountain Radio CBA IV, or the output from any of several DC loads >>> w/data ports) >>> >>> Or are you looking for current in/out graphing over a long period of time >>> on a system? This is pretty common and I *do* have solutions for this. >>> >>> Or battery state of charge measurement? A victron BMV-700 series, or a >>> trimetric battery monitor /w some sort of logging? >>> >>> Or...? >>> >>> Also, if this is monitoring a live system, what are you charging it with >>> and does it have a data port on it? >>> >>>> On Tue, Sep 17, 2019 at 7:35 AM Chuck McCown <ch...@wbmfg.com> wrote: >>>> Just graphical discharge records. >>>> >>>> Sent from my iPhone >>>> >>>>> On Sep 17, 2019, at 4:33 AM, Forrest Christian (List Account) >>>>> <li...@packetflux.com> wrote: >>>>> >>>>> Nope, never got around to it. >>>>> >>>>> I've recently become aware of several products which do something similar >>>>> to what I had in mind. What were you looking for? >>>>> >>>>> >>>>> >>>>>> On Mon, Sep 16, 2019 at 5:09 PM Chuck McCown <ch...@wbmfg.com> wrote: >>>>>> Did you ever build that battery tester characterizer thingy? >>>>>> -- >>>>>> AF mailing list >>>>>> AF@af.afmug.com >>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> >>>>> >>>>> -- >>>>> - Forrest >>>>> -- >>>>> AF mailing list >>>>> AF@af.afmug.com >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >>> >>> -- >>> - Forrest >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > -- > - Forrest > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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