Hi Stuart
Finally we have the 20 DiyShunts from the Spamnish Team.
Everything has gone very well, and although I have left my eyes a little, it was possible to weld all those small components.
I have tried the 19 and they all go well, but there is a last one that does not work, I put a video with the sequence of lights in case you can tell us where you think the problem is
Autoedited to elimiminated the link to the video sorry
Looking at the programming, I think I can identify 8 flashes in the sequence, so the problem would be
//8 flashes 10101010101010100000000000001111
const static uint32_t err_CheckSumErr = 0xAAAA000F;
How could I deal with a solution?
I don’t think so, it is one of the same 20 that Texas Intrument sent me from the USA.
Maybe it was damaged by heat in the assembly or, although it is rare not impossible, it was defective, it only remains to change it I imagine but it is very lazy to order just one because of the high shipping costs.
Thanks Stuart
@stuart
I am running the old controller with v4 modules. I see fluctuation on the voltage readings, see this video, is that normal ? You can see the readinf from the fluke meter which seems to be stable. As far as i can see all modules reacts the same, maybe it’s normal. I am measuring on Cell #15 with Fluke so it’s the one selected in the UI.
FYI: At the time of the video battery was beeing charged with 10A which is nothing compared to capacity of 160Ah and batery was around 60% SOC
my voltages also vary even when not charging but only a few mv.
how accurate is the module if you add 0.001v will it actually go up 0.001v?
My multimeter reads 0.025v too much right at the max error on the datasheet 3%.
i understand that is why it jumps ± 5mv when calibrating, if the reading goes up 5mv while you type you will be out by 4 or 5mv because it jumped to the next value.
@atanisoft , I’m in a bit of a hurry. Stuart tells me you might know someone who can build me some of these boards. If so, please DM me so we can discuss. Thanks a bunch.
I need the whole lot. 14 BMS boards, Shunt, Controller, etc. And the newest versions of everything.
I’m building a 100P14S battery bank for a Tiny Home Prototype Project, 48v system, using 18650’s (2200mAh). FYI, I’m also adding a Sol-Ark system to manage the whole thing - 12K or 5K, I haven’t decided yet - just so you know the big picture.
I checked what I have of extras and I can only help with the BMS module boards, I have 14 v4.1 module boards (7 fully assembled and I have the parts for the remaining). I don’t have any spare controller PCBs or any of the shunt PCBs.
Unfortunately with the parts shortages it is going to be a challenge to find all of the latest PCBs. I was going to order a batch of the Shunt PCBs but with multiple components being unavailable I’ve held off on ordering.
Sounds like an interesting project. I’m currently working with 160p7s (24v, ~20kWh) and have enough 18650s on hand to double the capacity.
Wow, I didn’t think the chip shortages was effecting PCB production, but I guess everything that goes on or with them is going to be caught up in all the shortages.
Can you email or call me directly so we can discuss timeline and costs for the 14 BMS modules as well as when you think a controller with screen will be likely?
Thanks
Not at this time. This is mostly just a backup supply for when PG&E decides that a PSPS event is necessary (PSPS = Public Safety Power Shutoff). The longest PSPS event we have seen was around 36hrs and it was a mess (not necessarily for us but the area in general). I’d rather not have a generator since I don’t have a good place to store it when not needed. So I now have a semi-portable setup that I can use as-needed.
PCBs are not generally impacted but being able to populate them is impacted. JLCPCB usually has most parts for the PCBs BUT often there are a few that are unavailable (ATTiny841-SSU as example).
Right now I’m not planning on ordering more PCBs unless there is enough demand for them. The costs will scale better for a full order (30 PCBs). If there is enough demand for a batch I can do some further digging into the BOM and see what parts may be unavailable etc.
