Batteries and Battery Management Systems
Traveled only 40 miles and battery pack was weak driving home. Charged the pack and today tested each battery. See chart of numbers. Number 41 and number 44 in the center area were Zero volts with the other 45 rest voltages running from 3.34 to 3.68. I have only 2 spares left so will rotate them into…
Had a low battery event on Christmas Eve. Towed home and a few days later I checked voltage and balanced the back. Chart below. The Quick-Charger brand charger is not working correctly I believe and the pack was past due for balance. December 24 Battery Low Voltage Event, Vehicle towed home and Voltage checked a…
The analog voltmeter has not worked for a year now. I really need to see what the voltage fluctuation is to get some bearing on the state of charge and the charging system. Would like a easy to read with a glance meter. LED digital volt meter with Red glowing digits will be the next…
This evening I had a Struggling Saturn as I rolled the last 5 miles with reduced power. My dash voltmeter has failed and I have not replaced it yet so I cannot record the voltage results nor did I have the cell log connected. Running through each battery and testing the results at rest are…
CellLog 8S Cell Voltage Monitor & Logger [[http://saturn.lynnautorepair.com/node/518|I installed the CellLog]] a couple of days ago. I logged 7 of the 48 CALIB 130 amphour LiFePO4 batteries both while driving and again during a charge cycle. The log data is very impressive and informative. When I first opted to go to the CellLog I had…
I installed a Cell-Log8S on the center battery box cell # 47 (the most negative) to #41. That is 7 batteries. The Cell-Log will monitor voltage only, not amps in, amps out or temperature. It will do some things that the Elithon would not. Store a log of the monitored cells see http://saturn.lynnautorepair.com/node/519 Display the…
A few days ago I was checking the battery pack voltages and noticed that 5 of the cells were reading over 4 volts and fail code warning. Upon further investigation #31 through #35 cells were not sending information to the controller of the Elithion Lithiumate BMS. The over 4 volts probably was a default reading.…
The BMS (battery management system) controller has two 12 volt inputs. One when the key is on (load power) and the other when the vehicle is being charged (source power). The [[http://saturn.lynnautorepair.com/BMS%20Elithion%20Lithiumate|Elithion BMS]] needs to know which condition or mode it is in. Mastech and RoadPro AC/DC converters During charging, it will, if commanded control…
The system is up and running but I have had a big problem with the source (charge) current sensor. The source sensor is required to use many of the features like SOC etc. Voltage reading on the White Charge Current Sensor with the Quick Charger 17 up amp charger on. For a few months now,…
Against the advice of Jack Rickard and James Edmonson I have installed a BMS to monitor the battery pack voltage and charging among other capacities. I do not at this time plan on using the automatic balancing part, but will instead balance when needed. Those who recommend no BMS recommend manually balancing the individual batteries…