[RE-wrenches] Battery Monitor for Li

[Ray Walters]

Default efficiency on the TriMet was 94%, needs to be quite a bit higher 
for Li+.  I'd try 98%.

2nd point:  Customers have always obsessed about meter readings: they 
need to take a chill pill, and accept its not going to be better than 
+/- 10% accuracy.  Or get a Fortress battery with built in SOC readings 
on the unit.

On 9/2/2022 1:13 PM, Eric Smiley via RE-wrenches wrote:
> I am having the same problem - same situation. I am going to tweak the 
> efficiency value and see if it helps.
>
>
> *Eric Smiley,* Project Manager
> eric at vecoop.ca <mailto:eric at vecoop.ca>
> T: 250.703.6004 <tel:+12507036004>
> T: 888.386.0116 <tel:+18883860116>
> *VIRIDIANENERGY.CA <https://viridianenergy.ca/>***
>
> **<https://viridianenergy.ca/>**
>
>
>
> On Fri, 2 Sept 2022 at 11:43, Kirk Herander via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org> wrote:
>
>     I’ve never installed simplify batteries. Do they make their own
>     state of charge monitor?
>     The trimetric has a perimeter called charge efficiency % You can
>     tweak that to get it to match the any benchmark more closely.
>     Also the trimetric should be reset to full on a regular basis,
>     When you have confidence the batteries are full. All trimetrics
>     drift off over time, especially given the unique charge
>     characteristics of lithium-ion’s versus lead acid batteries.
>
>     On Fri, Sep 2, 2022 at 2:32 PM Matt Sherald via RE-wrenches
>     <re-wrenches at lists.re-wrenches.org> wrote:
>
>         Hello Friends,
>
>         I have an off-grid customer for whom I recently installed some
>         SimpliPhi 3.8kW batteries.  This is an older system and it has
>         a Trimetric battery monitor that the homeowners have used for
>         years to keep an eye on their battery bank.
>
>         The SimpliPhi batteries appear to be working fine at the site,
>         but the homeowners feel uneasy b/c the Trimetric is reporting
>         that they are finishing each charging cycle with an amp-hour
>         deficit.  The voltage of the SimpliPhi batteries indicate that
>         they are getting fully charged and are doing so fairly early
>         in the AM (solar is the primary power source).
>
>         I've spoken with SimpliPhi tech folks and their hunch is that
>         the Trimetric is not reporting correctly.  They suggested that
>         a Victron BMV-712 would be more accurate at tracking Percent
>         Full etc...
>
>         Do you folks think that the Victron is better at counting Ah
>         in/out for Li batteries?  Or is the Trimetric adequate - do I
>         maybe just need to adjust the settings?
>
>         Anyway, the implication that the Victron BMV was better at
>         monitoring Li batteries has me curious and I will enjoy
>         hearing what the group thinks.
>
>         Thanks for your time!
>
>         -Matt
>
>
>
>         -- 
>         Matt Sherald
>         PIMBY Energy, LLC
>         304-704-5943
>
>         www.getpimby.blogspot.com <http://www.getpimby.blogspot.com>
>         www.getpimby.com <http://www.getpimby.com>
>
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>     -- 
>
>     *Kirk Herander / **kirkh at vermont.solar*
>
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