Recent content by elimac_pt

Thanks for your reply! Just to be clear what I meant..., I'm not sure if we are saying the same. I currently use the only UART port available on the BMS (that I am aware of) to connect to the GX device via USB (using the adapter box). I also have the Bluetooth dongle that I can use, but of...

Hello! Logging via Bluetooth would be awsome. Besides avoiding all the wiring - I am using 2 parallel banks in Summer, planning on 4 banks in Winter - I was hopeful that one could also be able at same time (briefly) to use the default Phone App "Xiaoxiang" to take a look at extra parameters of...

I think there was some Holidays in China last week. Should all return to normal this Monday.

I'm also going to adopt the SLIM configuration as shown in first post. But in my case it will be a 8S /24V configuration, hence I will have 2 rows of 4 cells. Advantage of this scheme is: - Both (+) and (-) come at same end -> less main cable to use (in my case) as it will be optimal distance...

I can confirm that well crimped lugs and 25mm2 cable resulted in with a much better interconnections than with the provided busbar (40mm2). If we can't flat it out, better to not use them Interconnection bridge from center ALU battery to the next, voltage drop while charging with 50A: -...

Has anyone considered making cable bridges with copper lugs? For who is worried anout stripping the fragile aluminium threads, the flexible cable (35mm2 in my case) will help diminuish the strain on the poles. The busbars are too rigid. If one disposes the prismatic cells back to back along the...

I did clean the surface. The root cause is almost for sure that the copper bus bars are not 100% flat, thus the contact is not perfect and highly dependent on vertical force. And some of them were 100% cold, and some very hot. So, I did have good contacts in some cells. While in load, I also...

I'm thinking about using helicoil for M5. This way I wouldn't have to dril. The outside dimensions should almost fit ok in a M6 threaded aluminium hole of the battery pad. What do you think?

ok... makes sense. I actually have a big problem now. And it was by using the original screws... I stripped at least two battery poles... the thread is gone :( It started by noticing the busbar was hot. The contact resistance was high, so I raised the torque. It got better, but not enough. I...

Why: 3) do NOT use Zinc Plated screws or hardware - ?

Thanks. Yes, I will modify accordingly. Has anyone, as a last resort, successfuly changed the M6 connection to an M8 connection? That is, enlarge the hole with new screw track, to M8. Do we have enough aluminium in the cell posts to do this?

Hi All, Yesterday I disassembled my 8S bank in order to insulate the bus bars and also plug in extra wires for a balancer. This mid-morning I had 465 overvoltage warnings on the BMS... specifically on cell #5... very strange. It was ok for the past weeks. First I thought it was the balancer...

ok, so the IRFB7730 is a better alternative. I'm considering the idea of swapping the SMD mosfets to lower the dissipated power with high currents. Has anyone tried this? BTW - does anyone know which transistor is involved in the balancing part that sometimes gets fried? Maybe a normal "547" or...

@OverkillSolar : do you know at which parameters did your customer manage to disrupt the BMS? I was looking today at affordable Mosfet alternatives to work over 30V (30V is not ok to use at 24V banks) and I couldn't find very much altenatives. IRFB7730 is one of my favourites, but Rds is still...

Great thread! I am very much interested in the 8S version. Does anyone know which mosfet is used in the 100A 8S version? By the photos it seems to be a TO-263. It cannot be the same of the 4S version, as the (good) mosfet used is only rated to 30V Vds. I want to antecipate how well can the 8S...