Update on the batteries in my MotorHome.
Today I did a useable capacity test and I am excited!
I installed eight 272ah Lishen cells - (12v - 544Ah battery) about 1-3/4 years ago. I did not do individual cell capacity tests, but after I got the battery made and installed I did a useable capacity test.
The way I did my test was when the battery is in absorbing mode and charging very little, and my Victron Smartshunt has reset to 100%. I cut all incoming energy and then used power until my Victron Multiplus cuts out. I call that the end of the test (yes my cells still have some Ah left in them - but I figure this gives me a good-safe- repeatable mark to test).
Right after I installed the battery, I got 527ah out of the battery. I was happy with my purchase! I figure a bit of the difference between 527ah and 544 ah is in the bottom few percentage.
We have been full-time RVers, so now 1-3/4 years later I redid the test and I got 521ah out. Wow! That really gives me confidence in these cells. They have probably operated the whole time above 50%, most days they get charged to 100% then down to 70 to 80% overnight, then back to 100%.
Anyway I just wanted to share how my cells are aging!
Here is a photo of my computer screen with the Batrium software. My cells were still between 3.04 and 3.08v, I was still burning 201w of DC power.
Yes it took 6hrs and 47 min to drain my battery! I made brownies (yum!) in the convection oven, had all the lights on, had an electric heater on plus computers, Starlink, Refrigerator, etc. I was using about 1000w of AC power at the end of the test plus 200w of DC power.
Today I did a useable capacity test and I am excited!
I installed eight 272ah Lishen cells - (12v - 544Ah battery) about 1-3/4 years ago. I did not do individual cell capacity tests, but after I got the battery made and installed I did a useable capacity test.
The way I did my test was when the battery is in absorbing mode and charging very little, and my Victron Smartshunt has reset to 100%. I cut all incoming energy and then used power until my Victron Multiplus cuts out. I call that the end of the test (yes my cells still have some Ah left in them - but I figure this gives me a good-safe- repeatable mark to test).
Right after I installed the battery, I got 527ah out of the battery. I was happy with my purchase! I figure a bit of the difference between 527ah and 544 ah is in the bottom few percentage.
We have been full-time RVers, so now 1-3/4 years later I redid the test and I got 521ah out. Wow! That really gives me confidence in these cells. They have probably operated the whole time above 50%, most days they get charged to 100% then down to 70 to 80% overnight, then back to 100%.
Anyway I just wanted to share how my cells are aging!
Here is a photo of my computer screen with the Batrium software. My cells were still between 3.04 and 3.08v, I was still burning 201w of DC power.
Yes it took 6hrs and 47 min to drain my battery! I made brownies (yum!) in the convection oven, had all the lights on, had an electric heater on plus computers, Starlink, Refrigerator, etc. I was using about 1000w of AC power at the end of the test plus 200w of DC power.
