Delta-V
Solar Enthusiast
- Joined
- Sep 20, 2019
- Messages
- 97
Looks like Steve has be the best overview pic.
Disconnect the battery box from anything connected to it. Remove all the side screws that hold down the top cover. Remove top cover. You may have to wrestle with and slice away any caulking along the way.
You should not have to clip any wires for an initial test.
---***---
>> Ah, forgot these are 12V instead of 24V. You'll likely see a similar cell pattern. But, cell testing should be pretty much the same approach. <<
---***---
For 24V, inside there's 16 long skinny cells that go horizontally down the length of the long box (under the vertical amber colored plastic coverings). Not sure for 12V, but probably similar configuration with half as many cells.
There's a left vertical column of screws/ bolts and a right column. Touch one multi-meter prob to a left bolt and the other probe to the corresponding right bolt. Note the voltage reading (plus or negative). Do this with all cells.
This is an initial voltage test before undoing anything further. You still may be able to notice a significant voltage difference with one of the cells before having to dismantle anything further.
If all cells show the same voltage, then you may have to unscrew the screws/ bolts and remove the aluminum bus bars from between the cells. Take pictures first and keep track of the wires/ bus bars. Be careful to make sure you don't short-circuit anything. You wanna make sure each cell terminal is not connected to any other cell terminal when re-checking the voltage readings.
Re-test each cell again like before. If one of the cell voltages shows significantly different from the rest then you've identified your problem. If all cells are still close in voltage readings then inspect further. Check for loose connections, look for burn marks, or anything that catches your eye. Last thing would be the BMS circuit board which is located in the upper middle laying on top, between cell terminals (between the left column of screws/ bolts and the right column). Inspect it to see if anything looks cracked, burnt, or damaged.
Disconnect the battery box from anything connected to it. Remove all the side screws that hold down the top cover. Remove top cover. You may have to wrestle with and slice away any caulking along the way.
You should not have to clip any wires for an initial test.
---***---
>> Ah, forgot these are 12V instead of 24V. You'll likely see a similar cell pattern. But, cell testing should be pretty much the same approach. <<
---***---
For 24V, inside there's 16 long skinny cells that go horizontally down the length of the long box (under the vertical amber colored plastic coverings). Not sure for 12V, but probably similar configuration with half as many cells.
There's a left vertical column of screws/ bolts and a right column. Touch one multi-meter prob to a left bolt and the other probe to the corresponding right bolt. Note the voltage reading (plus or negative). Do this with all cells.
This is an initial voltage test before undoing anything further. You still may be able to notice a significant voltage difference with one of the cells before having to dismantle anything further.
If all cells show the same voltage, then you may have to unscrew the screws/ bolts and remove the aluminum bus bars from between the cells. Take pictures first and keep track of the wires/ bus bars. Be careful to make sure you don't short-circuit anything. You wanna make sure each cell terminal is not connected to any other cell terminal when re-checking the voltage readings.
Re-test each cell again like before. If one of the cell voltages shows significantly different from the rest then you've identified your problem. If all cells are still close in voltage readings then inspect further. Check for loose connections, look for burn marks, or anything that catches your eye. Last thing would be the BMS circuit board which is located in the upper middle laying on top, between cell terminals (between the left column of screws/ bolts and the right column). Inspect it to see if anything looks cracked, burnt, or damaged.
Last edited: