Hi, can anyone help with an issue I have with my Seplos BMS? I was adjusting parameters on it and I lost connection. Now any time I try to start it up, it starts (LED's light up) for around 30 seconds and then shuts down.. Pack voltage is currently 52v. Any tips as to what could be causing this?
Seplos CAN BUS RS485 48v 200A 8S-16S BMS
- Thread starter Firechief
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houseofancients
Solar Wizard
were you setting the shutdown parameters ?
Yes!!! happened to me before! the firmware got corrupted
try to upgrade the firmware
keep rebooting the the bms untill it connect to the upgrade software
took me a bit of time
Battery Monitor - Google Drive
drive.google.com
Actually got another question now. Because I had to revert all settings this has messed up the total ah and useable ah. Should I just charge to full voltage @ 58.4v then set the pack AH correctly, then do a discharge to 10% @ 0.5c so everything gets calculated properly?
houseofancients
Solar Wizard
yes, afraid you'll need recalibate, but i wouldnt go to 3,65 a cell.
3,5 or 3,45( default setting) and 2,7 low (default) should be enough to calibrate
houseofancients
Solar Wizard
Ha ha, yes that old chestnut! I think I have my top-end voltages adjusted right now. More by luck than skill. I still can't figure out when it decides 100% is 100% but it did eventually do this last night and then put the battery in to standby (while waiting for load) which is what I wanted. Will have to test this again on the next charge cycle.
Working on tweaking the lower end today. That battery monitor software definitley has some funny quirks. I'd love to be able to correct all the incorrect English words. Would make it so much easier to read!
Working on tweaking the lower end today. That battery monitor software definitley has some funny quirks. I'd love to be able to correct all the incorrect English words. Would make it so much easier to read!
shavermcspud
Solar Enthusiast
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- Mar 12, 2020
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I started work on " translating" the software, if you have a look there are two XML files called en-us and one under the agreement folder called 16s_v20 with all the weird Chinese oddness language, this is read in depending on what config file you loaded up originally. I have changed quite a few including the max and min voltages so you can actually see the cell differences rather than the truncated output
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houseofancients
Solar Wizard
that would be good...
and i agree sometimes it is a quircky
houseofancients
Solar Wizard
well the only way ( i know of) of recalibrating the soc is a full charge to a full discharge
shavermcspud
Solar Enthusiast
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You can manually change the SOC, normally when I set these up for a customer, I top balance all the cells to3.65, hook up a new Seplos unit, login with admin & admin, go to upload settings, change the battery capacity,rated capacity, then change the SOC ah to whatever the cells are rated for, the change the top end cut off and bottom end cutoff, enable the balance and minimum delta then its job done. you have a fully charged pack, set at 100% soc noted with zero charge cycles ready to go. Section 58 & 59 are what you want to change.
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What I described is for a very special condition . The pylon firmeware give hint to the inverter when it need to re calibrate himeself. to do so there is provision in the protocol to tell the inverter to fully charge the battery. of course it is up to the inverter to do it or not.
Ok, so I'm struggling to get my (BMS) 100% charge sorted. I'm presuming I have this correct. The BMS should get to 100% / 280AH SOC and then go into standby. I can't seem to get this to work whatever I try. I've tried the default parameters, my own, and some others shared with me using the same setup. At the moment I have 3.400v as the alarm and 3.300v as the recovery. The BMS detects that one cell hits 3.400 and drops the charge rate to 10amps but this then continues to charge the cells and they quickly all charge up to 3.65 and trigger the overvoltage protection. Something doesn't seem right here. Any ideas? Cheers.
Sanwizard
Solar Wizard
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- Feb 2, 2021
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Yeah, what are the settings on your inverter? Set the inverter to stop charge before 3.65 per cell. Something like 55.4V, then float at 54V
I currently have my setup to charge to 56V (3.5V per cell) & float at 54.4V (3.4V per cell), but will most likely drop it a bit, as anything over 3.45 is negligable. Its good to balance high though. Andy at off-grid-garage has some good videos covering voltage settings and cutoffs.
_voltmeter_
New Member
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- Apr 24, 2022
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you have to disable the total voltage overvoltage protection switch and set the overvoltage in Harging overvoltage protection
and disable this Intermittent charging function, this crap will lock the charging on high soc.
men this bms is so bad translated i have some problems with my sunny island
my soc also dont set to 100%
sometimes it will but sometimes not, most of the time it sits on 98,3% for hours sometimes for minutes
i have recalibratetd the shunt, omg this was a mess
got a steady -25 a measured load then pressed calibrate and the bms calibrated to -29a next try it calibrated to -33a
then i got a lower load and it finaly calibrated spot on after many times i had just luck.
guys dont touch this damn calibrate buttons it will ruin your bms
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Thanks, I will give these suggestions a try. Yeah they really need to sort out the language issues as it would make it so much better. The hardware seems ok but software issues seem a pain. Kinda thinking I should have spent the extra on a better brand!
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