October 10, 20223 yr I have 2 Dyness BX51100 batteries on my newly installed system. The installer seems clueless. The batteries drain to 20% within 4 hours with an average load of .74 kwh Anyone that might have seen this before and some help if possible.
October 10, 20223 yr What inverter are you using with the batteries? Can you post images of the inverter battery setup and HOW the batteries were cabled?
October 10, 20223 yr 4 hours ago, The Eagle said: I have 2 Dyness BX51100 batteries on my newly installed system. The installer seems clueless. The batteries drain to 20% within 4 hours with an average load of .74 kwh Anyone that might have seen this before and some help if possible. Have they been fully initial cycle charged so that the inverter can have accurate initial state. On a new install do a full charge till absorbed fully then do a full discharge to empty running about 20 amp continuous load. Then do a full charge back to 100% absorb and on this initial charge try keeping to below or at .2c If all the cells were nicely balanced on install then that should initial cycle charge/discharge/charge will set them up to work correctly going forward.
October 10, 20223 yr Author Install was done more than a week ago. Been running since, but with this issue. Can I still do your recommendation?
October 10, 20223 yr Running more than a week. Has it also been giving you the low output the whole time, more than a week? Sounds like you may just need a decent full absorb and balancing charge. If the cells are out of balance it may take a while for them to get fully balanced, depending on how good the BMS is at balancing. Also like @mzezmanmentioned can you provide a photo of how the batteries are wired up. Incorrect wiring could cause the baetteries to go out of balance. But in such a short time it should not really have reduced the output by so much. It would do no harm to do the initial cycle charge/discharge/charge again.
October 10, 20223 yr Also ask your supplier for the battery monitoring software so you can check the state of the cells especially and how well they are balanced, if your inverter does not show all the cells voltages in each battery.
October 10, 20223 yr 10 minutes ago, The Eagle said: Am on mobile so I could be wrong but that cabling doesn't look correct. Which is the master battery in the setup? The dipswitches also look not right for a Deye setup. Please also post your LiBMS screen from the Deye as well as the Battery screen from the Deye
October 10, 20223 yr Author Initially the setting was to Lithium. Now the installer changed it to Batt %. Recon Lithium on Deye inverter is only for Deye Lithium Batteries.
October 10, 20223 yr Author The back battery is MAster - Dip switch 3 on The front is slave - Dip switch 2 on My concern is the in / out cables (ons is in yellow)
October 10, 20223 yr 1 minute ago, The Eagle said: The back battery is MAster - Dip switch 3 on The front is slave - Dip switch 2 on My concern is the in / out cables (ons is in yellow) From the Dyness manual the setting for the master is correct but the slave has to be all down. The cabling also needs to be amended to function optimally - you can leave the red as-is but the black would then need to go from Inverter > Slave -ve > master -ve CAN cable from Inverter into IN port on Master then cable from Master Out to Slave In These batteries work 100% with Deye in Lithuim mode Source >>https://solaradvice.co.za/wp-content/uploads/2021/10/Dyness-5-12kWh-BX51100-Lithiumion-Battery-UserManual.pdf
October 11, 20223 yr Author Thanks all for the assistance. The batteries was up much longer last night. Now to get the Time In Use correct.
October 17, 20223 yr Shocking to see these types of basic things being done wrong by installers...I am not an electrican but basic self-learning taught me that the install in the photos was incorrect...if this is a person's day job - make sure you are at least self-educating yourself... Glad to read that it seems like your system is performing better
October 17, 20223 yr 32 minutes ago, Douw G. Gerber said: Shocking to see these types of basic things being done wrong by installers...I am not an electrican but basic self-learning taught me that the install in the photos was incorrect...if this is a person's day job - make sure you are at least self-educating yourself... Glad to read that it seems like your system is performing better I for one am also weary of these installers who think they know it all, and refuse to listen to recommendations even by the supplier. IE MY electrician.
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