[RE-wrenches] Battery Monitor for Li

Sindelar Solar Allan at sindelarsolar.com
Fri Sep 2 12:29:54 PDT 2022

Matt, you didn't indicate whether this is a TM2020 or a newer TM-2030. 
The steps are the same, so it shouldn't matter.
Set the charge efficiency to 99%. Set the voltage to a few tenths of a 
volt below the Simpliphi's BMS setpoint.
Set the amps to off.
Make sure that P01 for auto reset is on.
Should work fine.

On 9/2/2022 12:43 PM, Kirk Herander via RE-wrenches 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>
*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
Founder (Retired), Sindelar Solar
*505 780-2738 cell*

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