weirded
New Member
- Joined
- May 8, 2021
- Messages
- 145
Correct - the setting is for latching switches vs. momentary buttons.
Seplos CAN BUS RS485 48v 200A 8S-16S BMS
- Thread starter Firechief
- Start date
BenYeats
New Member
Great thank you.
My plan is to take the PCB to work tomorrow and try to FLASH the code directly onto the processor. Just confirming this is possible
BenYeats
New Member
Turns out I can connect directly to the processor and re-flash. However the file supplied for FW update are in an encrypted format which are (presumably) decrypted as they are loaded onto the chip. Annoyingly this means the direct program method won't work.
I had contact from a Seplos engineer who was very helpful but wants the BMS back to re-initialise the unit which will take ages and be a major PITA!
I had contact from a Seplos engineer who was very helpful but wants the BMS back to re-initialise the unit which will take ages and be a major PITA!
BenYeats
New Member
Yes from Fogstar. I have asked if they can help with:
i) the return and reset of the original
ii) selling me another in the meantime as I assume turnaround time to China is ages
Fogstar don't seem to break any speed limits when it comes to replying, if no response I will phone them tomorrow.
BenYeats
New Member
Yes and a lot of kits delivered late December so I imagine a lot of support required.
I have a bit of SOC drift on my Seplos, reading in here I think it's because I usually only charge to 90%, and a 100% charge will cause it to wait until cell voltages hit limits? I have previously adjusted the SOC to get it to hit them, but I think that is in fact unnecessary?! I think going forward I could just set a schedule to 100% charge every few weeks, or are the BMS settings conservative enough that a 100% charge is not going to affect the life? I don't often need the full capacity of my system.
houseofancients
Solar Wizard
Seplos BMS v2 resets the soc at 100% charge..
Furthermore I hope you followed instructions to first calibrate the BMS to get a properly set SOC ?
Quattrohead
Solar Wizard
And what are these instructions or where would one find them?
Sanwizard
Solar Wizard
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- Feb 2, 2021
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They usually come with the BMS. It basically says that in order for the BMS to figure correct SOC with you specific battery, you need to fully charge to 100%, then fully discharge. At least one full cycle for the BMS to learn.
Yes the SOC was calibrated when I built it, although the instructions were no more detailed than your text above :D It didn't explain what I have now deduced, that "100%" is met by either the pack/total voltage being reached OR I think multiple individual cell voltage cutoffs in a certain period.
It did not explain that if you repeatedly charge to (say) 90% and discharge then the SOC will drift and it needs occasional charges to "100%" to maintain accuracy. From what I recall the SOC will sit at 98% and then "pop" to 100% when it decides that the pack is full, using whatever internal rules it has.
I'm using Home Assistant to automate an ME3000SP in passive mode, so I can just schedule a 100% charge once a month or so, no problem now I have it figured. The setup has otherwise run flawlessly for a year, the BMS and ME3000SP are pretty decent bits of kit for the money.
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BenYeats
New Member
Update on my situation. I now have a replacement BMS from Fogstar (who were brilliant), the snag now is it is the wrong 'type' so needs the separate PCB for connectors and LEDs. I will bodge something in the meantime to get back up and running.....
BenYeats
New Member
To update again I installed the board minus the connector daughter PCB. The firmware installed is missing all the protocols except Pylontech which worries me somewhat as I was hoping not to risk another FW upgrade. Won't do anything until I have received the daughter PCB.
Hi there, just got my kit last week and nearly completed the build but I was sent a V3 board instead of v2.
It's a type B board apparently and I can't find any documentation for connecting the BMS busbars.
Does anyone have a manual or picture of the BMS busbars connected ?
This is the board they sent .....
It's a type B board apparently and I can't find any documentation for connecting the BMS busbars.
Does anyone have a manual or picture of the BMS busbars connected ?
This is the board they sent .....
Sanwizard
Solar Wizard
- Joined
- Feb 2, 2021
- Messages
- 2,724
It should have come with a 1 sheet instruction manual, but the pictures on it are tiny anyway. There are multiple videos on youtube though:
Lt.Dan
Solar Wizard
That is for the 10E BMS (V2) His does not assemble the same way.
If the case is for a V2, and you got a V3 BMS, I'm pretty sure you are SOL without getting creative and making cables.
Quattrohead
Solar Wizard
Definitely sol, looks like they have done the shunt differently in the V3 and hence there is nowhere to connect those two connections now.
Lt.Dan
Solar Wizard
Yes, the V2 disconnects the positive side of the battery, and uses the shunt on the negative. The V3 flips that and disconnects the negative and shunts on the negative.
