Blog - Tests and diagnosis

The progress of the shirt circuit test (LTO-40AH)

The series of photos shows the progress of the short circuit test for the LTO-40Ah cell. At the beginning of the test, the temperature of the cells is same as the temperature of the surrounding, so that the cell is not visible at the IR photo.

Starting the tests, the temperature begins increasin

01.Feb 2021
| Blog - Tests and diagnosis

The safe battery technology LTO - - - - only 95°C during...

The data recorded at the short circuit test show that the maximal temperature of the Lithium Titanium Oxide - LTO-40AH - cell reached to some 94°C.

This tests proves that the lithium titanite(LTO) batteries are very safe and even during a massive short circuit,the temperature stays within the

01.Feb 2021
| Blog - Tests and diagnosis

The safe battery technology LFP - - - - only 85°C during...

The data recorded at the short circuit test show that the maximal temperature of the Lithium Iron Phosphate- TSWB 40AH - cell reached to some 85°C.

The outer temperature of the case measured by a temperature sensor was above 60°C, the more detailed measurement by the IR camera reached 8

01.Feb 2021
| Blog - Tests and diagnosis

The short circuit of 40AH cells - 2200 Amp reached!

The diagram on the left shows the data from a direct short circuit of the TSWB Winston 40AH cell. The cell was fully charged (even a little bit overcharged) to 3.4V volts of open voltage at the very beginning.

Right at the start, the current reachedthe peak above 2200 Amps. As the voltage of the cell

01.Feb 2021
| Blog - Tests and diagnosis

GWL/Team Making Safety Tests

In April 2019, GWL Team has made extensive tests of various lithium cells to demonstrate the results of abuse and damage for these cells.

One part of the test was adirect short circuit dischargeof a fully charged TSWB Winston 40AH cell.

The photos show the preparation of the test.

01.Feb 2021
| Blog - Tests and diagnosis

Details of the Emergency Output for CPM1

Pin # 1 - Main Turn-on Impulse- 150 ms pulse to GND

The pin will be connected to GND for 150 ms when the board is powered on, or after the board has been reset (and restarted).

This pin is designed to give an impulse to the bistable relay or to give a power-on impulse to the auxiliary controls

04.Jan 2021
| Blog - Tests and diagnosis

Dogma: The energy of the regular “AA” cells = 1.43Wh

The AA cells are the primary one-time use cells. The nominal voltage ofthe AA cells is 1.5Vand their capacity in Ah usually not stated in the specification.It shows that people are fooled easily. ????

Image: you buy the milk in some box every day, but you never now how much liter

21.Dec 2020
| Blog - Tests and diagnosis

A battery pack keeps discharging “by it-self”

Email:Unfortunately, I do not have good news. We faced again a strange situation. The system was not used in the past 2 weeks, there was no grid shortage, the system was not used, and the BMS show that the battery pack was full, please see below the inverter log.

It is obvious from the voltage that&nb

30.Nov 2020
| Blog - Tests and diagnosis

We are moving electrons. A lot of them!

When cells are charged and discharged, the volume of the mass inside the cell is changing. This is because the electrons have a mass and this mass is added or removed when charged or discharged.

How many electrons are moved when working with the current of 1 Amp?

The electron flow produces current. T

16.Nov 2020
| Blog - Tests and diagnosis

BMS123 or GWL CPM? - Deeply discharged cells

As our customers are well aware, some type of protection module is necessary to use with every lithium battery for prevention of a deep discharge or overcharge.

I will use the example of our customer from Holland to describe how a significantly cheaper GWL CPM protection can often be the better choice th

06.Nov 2020
| Blog - Tests and diagnosis
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