Recent content by stobbie

No, I don't do that, cell are within 3mv of each other most of the time. Maybe they will drift a bit if you charge higher, but at only 3.4v they stay close to each other.

YES, same here! My fets will never switch.

I Only charge to 3.4 / 13.6 volts. I barely loose any capacity. I have cell overvoltage set at 3.5v per cell. And programmad the BMS to read 100% when one of the cells hits 3.4. So I'm very much at the safe side, my cells will stay healty for a long time, I barely loose capacity..

OK thanks, it doesn't matter too much, the numbers speak for them self, and everything I need to know is on the first screen. I even only designed only one button in my 3d printed enclosure. Only to turn the display on when it is switched off. Mine stays on while charging or discharging but...

I've bought my display a few months ago, but it is in Chinese.. How did you set it to English?

Please don't use stainless steel scrub screws in the aluminium cells. They will corrode. Use normal galvanised fasteners

Not very hard, my sides are 3printed parts with only 20% infill, so you cannot clamp it very hard. Just enough to be able to pickup the pack without the cell in the middle falling out. There's nothing underneath, they are held together only by clamping. I've clamped them at 80% SOC, I wasn't...

From the 8 cells in my van four were completely melted, and four had medium fire damage, melted top vent etc. I've cycled the four cells lots of times now and they still perform like before the fire. They smell very badly so I did nt fit them to the new camper.

To return to my fire from a few weeks ago.. My cells were compressed, could it be a possibility that they didn't have enough room to expand during charging, and that something inside expanded and created an internal short?

That's the second fire here on the forum? I have never found the cause of my fire, but it has cost me $ 40.000 dollars unfortunately :-( Now put a small pack of four cells again in my new campervan, still a bit scared...

It is not the 123BMS, but it is of a similar kind. In Europe a lot of the Yellow Winston cells are sold from Prague, they also sell the Dutch 123BMS. I own such a set, and it is of much better quality than the Lishen or Eve cells with Daly or JBD/overkill BMS. But I do like the cheap stuff...

I have now ordered a small voltage controlled relay to turn the charger on and off.. I think that will be the solution https://www.aliexpress.com/item/33017409932.html

A friend of mine uses a JBD bms, and charges his batteries to 13.6 volts to stay within his 80% usage scenario, his pack OVP is set at 13.6v in the bms. MPPT and DCDC are programmable and are set to charge up to 13.58v, so if everything is well ovp from the BMS doesn't have to kick in. Only...

Well... new campervan, new lishens.. fitmend not as clean as on the one that burned down, but everything works. A lot of work today, glued two solarpanels on the roof 1 x 340 wp panasonic HIT en one perc 200wp. Installed a 30A victron 220v charger, a victron orion 30A DCDC, a victron MPPT...

At the back the enclosure is open, and at the front there is the grille. But I will have to monitor it for a while. But with max Amps of 50 my BMS has never even got warm while carging or discharging. So I think it will be OK.