Good evening everyone,
Around 18 months ago, I purchased a Seplos Mason 280Ah pre-assembled battery. My plan was to install it in the new house I was building, expecting to do so 2-3 months after the purchase. Unfortunately, due to construction delays, the battery remained unused during this period.
Aware of the risks, I decided to check the battery before buying the other components of the ESS system. When I powered it on and reviewed the menus, the State of Charge (SOC) showed around 49%, so I assumed everything was in good condition.
I then proceeded to buy a Victron Multiplus II, a Cerbo GX, an ET112 energy meter, and the remaining materials to connect everything. However, after completing the installation and turning on the Multiplus, it shut down unexpectedly after a short period. This struck me as odd, so I double-checked everything but couldn't identify the issue.
I decided to disconnect the battery and try again, and this time, the Multiplus stayed on as expected.
Upon revisiting the Seplos battery menus, I noticed that one of the cells displayed a significantly different voltage. While 15 of the 16 cells were around ~3295mV, cell 11 was showing only ~150mV. Ouch! This is likely what caused the Multiplus to shut down.
After contacting the seller, they advised me to check if the nuts were properly tightened. Unfortunately, this is where I made another mistake. I decided to test a torque wrench I had recently purchased. I set the torque to 4 Nm, as advised, but the wrench allowed me to apply a significant amount of force—possibly due to a malfunction. While tightening, the nut slipped, and I accidentally broke part of the cell's bolt.
Now, I'm hoping for some guidance on what to do next:
Kind regards,
Pedro Vieira
Around 18 months ago, I purchased a Seplos Mason 280Ah pre-assembled battery. My plan was to install it in the new house I was building, expecting to do so 2-3 months after the purchase. Unfortunately, due to construction delays, the battery remained unused during this period.
Aware of the risks, I decided to check the battery before buying the other components of the ESS system. When I powered it on and reviewed the menus, the State of Charge (SOC) showed around 49%, so I assumed everything was in good condition.
I then proceeded to buy a Victron Multiplus II, a Cerbo GX, an ET112 energy meter, and the remaining materials to connect everything. However, after completing the installation and turning on the Multiplus, it shut down unexpectedly after a short period. This struck me as odd, so I double-checked everything but couldn't identify the issue.
I decided to disconnect the battery and try again, and this time, the Multiplus stayed on as expected.
Upon revisiting the Seplos battery menus, I noticed that one of the cells displayed a significantly different voltage. While 15 of the 16 cells were around ~3295mV, cell 11 was showing only ~150mV. Ouch! This is likely what caused the Multiplus to shut down.
After contacting the seller, they advised me to check if the nuts were properly tightened. Unfortunately, this is where I made another mistake. I decided to test a torque wrench I had recently purchased. I set the torque to 4 Nm, as advised, but the wrench allowed me to apply a significant amount of force—possibly due to a malfunction. While tightening, the nut slipped, and I accidentally broke part of the cell's bolt.
Now, I'm hoping for some guidance on what to do next:
- Is it possible to reactivate the faulty cell, or is it dead?
- Can I remove that cell and connect the 10th cell directly to the 12th cell?
- If so, how should I proceed, and will the BMS need reconfiguration?
- If not, is it possible to replace just that one cell? If so, do you know any European stores or websites where I could purchase a replacement?
Kind regards,
Pedro Vieira
Can i unscrew the terminal? I mean there's still a like 3mm outside of the cell. Or is there other ways to fix that?
