LiFePO4 Battery Load Test.... These Batteries Are SIMPLY AWESOME!

We did a load pull test on the two Lithium Iron Phosphate (LiFePO4) batteries I bought from Lithium Valley, and they performed better than expected. After 1.3 years I did expect some amount of performance reduction, but none at all. They actually performed better than the specification.

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Joey Deng
Wechat/Skype/Whatsapp: +8613922267765
Email: [email protected]
Visit us: www.lithiumvalley.com

The two other videos on Batteries:

This was the answer to one of the questions: I think most people that are interested in this video would be interested in the answer.

I graduated from University of Texas at Austin with a degree in Electrical Engineering. UT Austin is one of the top universities for engineering in the USA. I worked as an electrical engineer for for over 30 years. And, though I am not a power engineer, I understand a little bit about the movement of electrons in a wire.

Regarding what I was testing: I showed 2 main things – After the batteries were 16 months old they accepted a charge with low resistance. From 1:10AM until 14:20 or 2:20PM I charged the batteries at about 47 to 60 amps from a discharged state (starting voltage was 23.4V) as shown in the charging spreadsheet. This took 13 hours 10 minutes, and used 16.8KW hours. THUS – I put in 16.8KW Hours into the batteries…. The charging spread sheet is at 16:57

The next spreadsheet I put up was the discharge. I turned on the inverter and the AC unit which pulled between 30 to 42 amps off the batteries. So over a period of 17 hours 25 minutes the batteries were able to power the Inverter and AC unit using a total of 16.3KW hours of energy. So, in this experiment I lost only 500 watt hours of energy. That is simply AMAZING! The Discharge spread sheet is at 17:02

I know that my experiment was not perfect, but even if I was off 5%, these batteries are still Amazing.

The batteries that I had for the test were 2 x 300AH at 24V…. This batteries are specified to hold about 600AH x 26volts = 15.6KW hours. So, during the test, I pulled 16.3KW hours out of batteries. These batteries are 16 months old and were specified to hold about 15.6KW hours.

1) The batteries did not use a lot of energy to get the electrical energy into chemical potential energy. (Low resistance to put electrons into the battery)
2) I was able to USE almost 100-(500/16800) = 97% of the energy I put into the batteries.

16800 Total Watts I put into the batteries
16300 Total Watts I pulled out of the batteries
500 is the Watt hours lost (16800 – 16300)

These batteries are simply amazing. So, I bought the 3rd battery.

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