September 20, 20232 yr Please ensure that all the battery cables are the same length. Fuse should disconnect the Positive and Negative. 25mm cable from batt to fuse/busbar is fine. From there I would use 50mm to the Inverter. what he said !!!
September 20, 20232 yr I'd personally set it a little bit lower at 52.5v. That's enough for the batteries to balance. (I run mine at 53.2v once a week (until it gets to 100% SOC) and 52.5v for the rest of the week).
September 20, 20232 yr Author I'd personally set it a little bit lower at 52.5v. That's enough for the batteries to balance. (I run mine at 53.2v once a week (until it gets to 100% SOC) and 52.5v for the rest of the week). fair comment.. so I need to change all three voltages on that page to 52.5? very occasionally with the two batteries and the installers settings both batteries would go into alarm state if they are at 100% late in the afternoon, maybe once very couple of months or so, and turning them off and back on again would clear it. maybe this is was the cause - overvolt protection. but to be honest I thought it didnt actually matter what voltages you set on the inverter as the bsm link would correct it anyway.... either way ill drop mine down to 52.5 and monitor I think
September 20, 20232 yr fair comment.. so I need to change all three voltages on that page to 52.5? very occasionally with the two batteries and the installers settings both batteries would go into alarm state if they are at 100% late in the afternoon, maybe once very couple of months or so, and turning them off and back on again would clear it. maybe this is was the cause - overvolt protection. but to be honest I thought it didnt actually matter what voltages you set on the inverter as the bsm link would correct it anyway.... either way ill drop mine down to 52.5 and monitor I think The BMS link should set the voltages but I have a recollection that someone on here mentioned that the batteries will use the settings if the CAN fails. I think their was a link to a YouTube video about it. (It may have been on another forum that it wa mentioned.) Personally I would expect the inverter to shut down but I don't have your inverter.
September 20, 20232 yr Has your setup always had the CAN connection working as you mentioned the installer using a standard patch cable?
September 20, 20232 yr Author Has your setup always had the CAN connection working as you mentioned the installer using a standard patch cable? Yea I worked out his bad CAN connection basically on week one. I mean all I had to do was read the manual and see straight away something wasn't right. So its basically always been working. I called them out to look at it and he blindly insisted right in front of me that everything was correct. In the meantime I had found the pinouts online and made my own cable, so plugged it in right in front of him and showed him right there as the CAN page lit up with all the correct readings how wrong he was. He then asked me how to make the cable 🤦🏻♂️ Anyway it makes sense that maybe if for whatever reason the CAN fails it would revert to inverter settings, even for just a second so im gonna have backup settings on the inverter low at 52.5v across the board and then just see if i get a random alarm again at some point. its so intermittent that i might have to wait a few months. New battery looks great though.. charged to 100% today and is now gradually on its way back down with no issues so far. the way ive cabled them all up is also miles better than the installer so that may also help the intermittent alarm.
September 20, 20232 yr Yea I worked out his bad CAN connection basically on week one. I mean all I had to do was read the manual and see straight away something wasn't right. So its basically always been working. I called them out to look at it and he blindly insisted right in front of me that everything was correct. In the meantime I had found the pinouts online and made my own cable, so plugged it in right in front of him and showed him right there as the CAN page lit up with all the correct readings how wrong he was. He then asked me how to make the cable 🤦🏻♂️ Anyway it makes sense that maybe if for whatever reason the CAN fails it would revert to inverter settings, even for just a second so im gonna have backup settings on the inverter low at 52.5v across the board and then just see if i get a random alarm again at some point. its so intermittent that i might have to wait a few months. New battery looks great though.. charged to 100% today and is now gradually on its way back down with no issues so far. the way ive cabled them all up is also miles better than the installer so that may also help the intermittent alarm. Sounds like you are quite savvy there you might want to look into getting a cable to connect to your console port on the battery so you can grab the history/events from the BMS and see why it was throwing alarms. Go through this thread, the info is in there on how to do it . https://powerforum.co.za/topic/2322-youdas-off-grid-lab/
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