[RE-wrenches] The Tri-Metric TM-2030-A and LFPs

[Sindelar Solar]

Lou,
I spoke this morning with Kedar, who purchased Bogart Engineering 
several years ago, about an out-of-warranty repair on a TM-2030 (Stupid 
human trick - after installing maybe 100 TriMetrics over 30 years I 
wired a new one backwards). Remembering your post I asked him about 
settings for lithium batteries in general. I have done this successfully 
with several Blue Ion LFP battery replacement installations.
His recommendations:
- set voltage to the BMS voltage regulation setpoint (55.2 for Blue Ion)
- set amps either Off or to a high (5-10%) to disable this parameter
- Set CEF to 98-99%
- set battery AH capacity to actual rated capacity @100% DoD

I checked records for a couple of my own 2018 installations (Both of 
these had existing TM-2020s rather than TM-2030s, which shouldn't make 
any difference in their settings and operation.):
- I set voltage a bit lower - 54.0 and 54.5
- I set amps off in one case and 8A in the other
- I set a large (24 kWhr) CEF to 98% and a smaller (8 kWhr) set to 95%
And both have continued to supply accurate and usable info to the client.

By the way, I was initially disappointed to learn that Ralph Hiesey had 
sold his business and retired. I have recently, however, received 
excellent customer support from Kedar, the owner of Bogart Engineering, 
and wanted to pass that good review along.
Allan

On 6/4/2021 12:16 AM, Lou Russo wrote:
> Aloha All,
> Does anyone have experience with the TM-2030's SOC accuracy when used 
> with LFP batteries that they are willing to share?
> I would think the TM-2030 would be accurate but I just want some 
> confirmation.
> Thanks.
> Lou Russo
-- 

*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

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