[PaulRekow]

Hi All, four years ago I converted my Grasshopper lawnmower from gas to electric. I am using 15 Calb 180Ah Li-ion cells, an Elcon charger and CelanPowerAuto BMS v2 which I purchased from Lithium Storage. I also have a Link 10 battery monitor that I use to watch the Amphr's in and out. This has worked fairly well for the last four years with a few minor charging/discharge issues.

My current problem is that the charger is shutting off due to one cell getting to high voltage on the BMS before the charger has had a chance to EQ all the cells. I usually run the batteries to about 80-100 Amphrs discharge level and then recharge. With the BMS shutting the charger off early, the Link10 indicates there is still 15-20 Amphrs of charging left.

I thought the BMS was the problem as two of the cell modules have some corrosion on the chips due to condensation. I moved the BMS cell module and the same battery cell caused the BMS high voltage to shut the charger off.

I have tried to contact Lithium Storage and CleanPowerAuto to get a replacement BMS modules with no luck. I am concerned that if I continue to use the mower without fully charging all the cells I am eventually going to ruin the batteries.

Any thoughts on what I can do to correct this situation.

Thanks, Paul

 

[PaulRekow]

Sorry for my ignorance, but what is meant by "bottom balance batteries"

I do not have much experience with Lithium.

Sorry.

 

[PaulRekow]

Hi Kennybobby, each of the 15 cells reads 3.32 volts currently. Last charge was at 5 pm Monday. Hi voltage on the BMS is set at 3.7 volts, most of the other cells are about 3.35 right before the BMS shuts down the charger.

I usually disconnect one cell when I am not using the machine for more than two weeks. I usually have one cell that is a little lower voltage when it sits for more than a month.

 

[PaulRekow]

This is a basic question that I should know the answer to, but I'm not sure. Do the individual cells need to be disconnected from series connections to get an accurate volt reading on each cell?

Sorry for the ignorance.

 

[PaulRekow]

Is there a better method than the Zantrex Link-10 for measuring the discharge while mowing? I watch the Amphr's discharged and charged and lately I'm always short on the charge side even though the individual cells read charged.