Jazzmonger
Hacker at heart
Im turning my attention to my batteries now trying to figure out why the capacity readings are so far off when SOC is 100%. These are all 100ah "ESS PowerUp" LifePO4 batteries I got from watts247 a couple of months ago. https://watts247.com/product/powerup-lifepo4-5-1kwh/
They have always showed these capacity numbers from the day I installed them and got the BMS working w/ Solar Assistant.
They are wired in Parallel using 2/0 gauge battery cables, + wired at the top + terminal and - wired at the bottom - terminal. cable length from batteries to inverters is 40" max. I've tried doubling up on 2/0 cables between batteries with no change.
![1661558708296.png 1661558708296.png](https://diysolarforum.com/data/attachments/108/108739-304f3fed3dd7189274a8d802df314cd2.jpg)
Solar Assistant readings:
![1661558024644.png 1661558024644.png](https://diysolarforum.com/data/attachments/108/108730-4ffa89f145fe631e00659bd5da4f4333.jpg)
I have max charge current set to about 80A, but it makes no difference what I set that to. Measuring DC current on each battery during recharge I get about equal amps going into each battery (ie 20A) during max charge either from PV or from Grid. They are at 96% right no bc the sun went down an hour ago and I'm on my discharge cycle.
Any help in understanding whats going on would be helpful. Watts247 says I need bigger battery cables.... I respectfully disagree.
Jeff
They have always showed these capacity numbers from the day I installed them and got the BMS working w/ Solar Assistant.
They are wired in Parallel using 2/0 gauge battery cables, + wired at the top + terminal and - wired at the bottom - terminal. cable length from batteries to inverters is 40" max. I've tried doubling up on 2/0 cables between batteries with no change.
![1661558708296.png 1661558708296.png](https://diysolarforum.com/data/attachments/108/108739-304f3fed3dd7189274a8d802df314cd2.jpg)
Solar Assistant readings:
![1661558024644.png 1661558024644.png](https://diysolarforum.com/data/attachments/108/108730-4ffa89f145fe631e00659bd5da4f4333.jpg)
I have max charge current set to about 80A, but it makes no difference what I set that to. Measuring DC current on each battery during recharge I get about equal amps going into each battery (ie 20A) during max charge either from PV or from Grid. They are at 96% right no bc the sun went down an hour ago and I'm on my discharge cycle.
Any help in understanding whats going on would be helpful. Watts247 says I need bigger battery cables.... I respectfully disagree.
Jeff