Solar project thoughts.
Hi guys. Midway through installing. I have the panels mounted and working through wiring. Looking for thoughtful comments. Here are a couple pics of install to date.
Forum Discussion
Quick update.
Finally started bottom balancing the cells. In this procedure each of the (24) 3.2v/100AH cells is discharged to 2.5 volts, allowed to recover to around 2.8v and then again discharged to 2.65v. Each cell should recover to around 2.7v. At that point cell voltages are compared. They should all be within a couple hundredths of a volt from each other. At that point groups of 4 in series are charged together and again voltages compared. I start with a relatively low charge limit and slowly adjust up to ensure no single cell will be charged past the manufacturers safe limit of 3.65. My actual final limit will probably be in the 3.4v max per any cell staying well below the margin of safety while charging. There is very little energy to be gained by trying to may out charging capacity.
Finally started bottom balancing the cells. In this procedure each of the (24) 3.2v/100AH cells is discharged to 2.5 volts, allowed to recover to around 2.8v and then again discharged to 2.65v. Each cell should recover to around 2.7v. At that point cell voltages are compared. They should all be within a couple hundredths of a volt from each other. At that point groups of 4 in series are charged together and again voltages compared. I start with a relatively low charge limit and slowly adjust up to ensure no single cell will be charged past the manufacturers safe limit of 3.65. My actual final limit will probably be in the 3.4v max per any cell staying well below the margin of safety while charging. There is very little energy to be gained by trying to may out charging capacity.
