I should also add that even though my cells are all supposed to be the same I will get substantial cell differential voltages during charging which often causes the BMS to trip before the cells are fully charged. Talking with Chargery, they say they have increased the ability to tolerate cell differences up to one volt with their version 4 BMS release (mine are version 3 but upgradeable to version 4 by firmware). I noticed that when top balancing my cells with a chargery charger one cell got to full long before the others and tripped the charging process. Since the cells were around 3.3 volts at the start of charge this may not happen if I began charging from an empty state. Of course, I could have a bad or out of tolerance cell. As you may have noticed, just because a cell has the same voltage does not mean it is truly at the same charge state. In other words, when I charge cells individually from the same initial voltage, some cells take much longer to reach full than others. I have 150 ah cells from China. Maybe they were not new as even though they were supposed to be. They do look new though. Have you characterized or noticed discrepancies with you individual cells when charging?
I have not configured the full battery bank here yet so can't relay my experiences. In theory paralleled cells should share voltage/current and not get out of balance with each other. I HAVE experienced this issue with many paralleled cells and found the cause to be less than perfect connection between the cells. I checked the terminal screw torque readings carefully and found a few of them were a bit less than perfect. Torquing those properly resolved the problem. You may also check that your conductors or bus bars between parallel cells are sufficient and make sure there is no corrosion or other contaminants blocking the flow of current anywhere...
I ordered 32 Lischen cells 280ah on Alibaba from Senberry. cost $3063.80 including shipping. which is 95.74 per cell. the next project is getting a BMS. for a 48-volt system. I see you doing 4p16s with your battery bank. is that all on one BMS? nice videos! just in time for me to learn some more. I building an insulated (locked) power shed for the batteries and inverters and charge controllers now. to keep the children out and safe!
We will do it all on one Chargery bms with separate 300 amp dc contactors on the charge and discharge. the 4p packs should behave as single cells since they are paralleled... On the charge side I plan to use the charge contactor to disconnect the solar panels from the charger rather than the charger from the battery since I am going to run midnite classic charge controllers which can be damaged if disconnected from the batteries when still connected to the panel voltage.
Since you have your batteries in 4p are you having any problems with cell differences (like voltage and/or capacity) causing one or more of the batteries in parallel to get too much charge/discharge? Of course the cells should have the same voltage as they are in parallel but I have noticed that my cells do not charge identically probably due to internal manufacturing tolerances (have not tested the discharge yet). I am going to be building a 48 volt system with four separate banks of 16s-1p and four chargery BMS16T's. I already have all the gear but have to hook it up. I have considered putting two or more cells in parallel so I could use fewer BMS's (thus save power on the relays) but worry about my cell differences causing uneven cell discharge/charge in a parallel configuration. It might work out as a solution to the cell difference problem or it could cause uneven loading and place more strain on one cell than another. Just wondering if you have looked at this?
My shipped price was 97$ per cell. I requested shipment via sea as it is quite a bit cheaper. shipping time averages 30-40 days from payment to receipt of the goods.
M8 I believe. Insulated ratched could be nice. The terminals are aluminum though so it would probably be easy to strip the threads with too much torque.
Battery storage is the new gold rush. (-; Looking forward to getting these hooked up and working sometime in the next few weeks for our cabin. I am a bit distracted by other projects right now... Our used BYD liFoPo4 battery bank is up and running at our workshop/greenhouse. Similar storage capacity at about 47Kwh tested. There are a few videos on here about that project if you would like to check them out...
I should also add that even though my cells are all supposed to be the same I will get substantial cell differential voltages during charging which often causes the BMS to trip before the cells are fully charged. Talking with Chargery, they say they have increased the ability to tolerate cell differences up to one volt with their version 4 BMS release (mine are version 3 but upgradeable to version 4 by firmware). I noticed that when top balancing my cells with a chargery charger one cell got to full long before the others and tripped the charging process. Since the cells were around 3.3 volts at the start of charge this may not happen if I began charging from an empty state. Of course, I could have a bad or out of tolerance cell. As you may have noticed, just because a cell has the same voltage does not mean it is truly at the same charge state. In other words, when I charge cells individually from the same initial voltage, some cells take much longer to reach full than others. I have 150 ah cells from China. Maybe they were not new as even though they were supposed to be. They do look new though. Have you characterized or noticed discrepancies with you individual cells when charging?
I have not configured the full battery bank here yet so can't relay my experiences. In theory paralleled cells should share voltage/current and not get out of balance with each other. I HAVE experienced this issue with many paralleled cells and found the cause to be less than perfect connection between the cells. I checked the terminal screw torque readings carefully and found a few of them were a bit less than perfect. Torquing those properly resolved the problem. You may also check that your conductors or bus bars between parallel cells are sufficient and make sure there is no corrosion or other contaminants blocking the flow of current anywhere...
I ordered 32 Lischen cells 280ah on Alibaba from Senberry. cost $3063.80 including shipping. which is 95.74 per cell. the next project is getting a BMS. for a 48-volt system. I see you doing 4p16s with your battery bank. is that all on one BMS? nice videos! just in time for me to learn some more. I building an insulated (locked) power shed for the batteries and inverters and charge controllers now. to keep the children out and safe!
We will do it all on one Chargery bms with separate 300 amp dc contactors on the charge and discharge. the 4p packs should behave as single cells since they are paralleled... On the charge side I plan to use the charge contactor to disconnect the solar panels from the charger rather than the charger from the battery since I am going to run midnite classic charge controllers which can be damaged if disconnected from the batteries when still connected to the panel voltage.
that is cheap . i bought in aliexpress 16 cells 280ah $2500 including shipping .
@@michaeltran9879 Did they arrive in good shape?
Since you have your batteries in 4p are you having any problems with cell differences (like voltage and/or capacity) causing one or more of the batteries in parallel to get too much charge/discharge? Of course the cells should have the same voltage as they are in parallel but I have noticed that my cells do not charge identically probably due to internal manufacturing tolerances (have not tested the discharge yet). I am going to be building a 48 volt system with four separate banks of 16s-1p and four chargery BMS16T's. I already have all the gear but have to hook it up. I have considered putting two or more cells in parallel so I could use fewer BMS's (thus save power on the relays) but worry about my cell differences causing uneven cell discharge/charge in a parallel configuration. It might work out as a solution to the cell difference problem or it could cause uneven loading and place more strain on one cell than another. Just wondering if you have looked at this?
hi , How much is the total price with shipping and all taxes? How long was the delivery?
My shipped price was 97$ per cell. I requested shipment via sea as it is quite a bit cheaper. shipping time averages 30-40 days from payment to receipt of the goods.
what size are the terminal screws? I think bolts would be better with a small ratchet or torque wrench maybe. any info is always appreciated.
M8 I believe. Insulated ratched could be nice. The terminals are aluminum though so it would probably be easy to strip the threads with too much torque.
Dang those are all 280Ah that's like 43Kwh
Battery storage is the new gold rush. (-; Looking forward to getting these hooked up and working sometime in the next few weeks for our cabin. I am a bit distracted by other projects right now... Our used BYD liFoPo4 battery bank is up and running at our workshop/greenhouse. Similar storage capacity at about 47Kwh tested. There are a few videos on here about that project if you would like to check them out...