[RE-wrenches] SOC and LFP batteries and TriMetric

[Jay]

A follow up question to all of this:

Does anyone know what parameters a BMS is using to determine SOC for lithium?

A project I installed uses the Orion BMS jr  for lithium batteries.  It uses a normal shunt, voltage and also measures internal cell resistance to determine SOC. 

Jay
Peltz Power





> On Aug 21, 2018, at 10:29 AM, Howie Michaelson <Howie.Michaelson at gmail.com> wrote:
> 
> Allan, have you talked directly with Bogart?
> Howie
> 
>> On Tue, Aug 21, 2018 at 12:56 PM Sindelar Solar <Allan at sindelarsolar.com> wrote:
>> Wrenches,
>> I  would like to broaden this topic a bit, please: we're currently installing our first Blue Ion LFP set (48kWh). I work almost exclusively with existing off grid systems, often older systems most of which have TriMetric monitors, either the TM2020 or newer TM2030. Has anyone successfully reprogrammed a TriMet to accurately register SOC and other data with LFP batteries? If so can you provide some guidance as to program settings?
>> Thank you, 
>> Allan
>> 
>>> On 8/20/2018 6:15 PM, Lou Russo wrote:
>>> Jay,
>>> The batteries are Blue Ion 2.0 from Blue Planet Energy, the 8kWh cabinet. The listed Maximum Continuous Charge and Maximum Discharge Rate is 1C.
>>> 
>>> Aloha,
>>> Lou Russo
>>> 
>>>> On Sat, Aug 18, 2018 at 6:27 AM Jay <jay.peltz at gmail.com> wrote:
>>>> Hi Lou,
>>>> Can you tell us which LFP batteries?  
>>>> And what rates of discharge/charge?
>>>> Jay
>>>> Peltz power. 
>>>> 
>>>> On Aug 17, 2018, at 12:09 PM, Lou Russo <lou at spreesolarsystems.com> wrote:
>>>> 
>>>>>  Hello All,
>>>>> 
>>>>> Does anybody have any insight in getting the SOC to report accurately on the Outback FNDC when using batteries that have a minimal voltage curve? I have several systems with LFP batteries that have both a eGauge (communicating directly with the battery BMU) and a FNDC and I get wildly different SOCs. In a typical  24 hour period (12am-12am) I get SOCs on the FNDC that vary 2% to 34% of what the battery BMUs are reporting. I am assuming that the BMUs are reporting accurately. I would think a 1%-5% difference would be acceptable.
>>>>> 
>>>>> Any help or thoughts on this subject  would be greatly appreciated.
>>>>> 
>>>>> Aloha,
>>>>> Lou Russo
>> -- 
>> Allan Sindelar
>> 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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