_matt_

Thanks! Yeah bms side of things seems functional. It does it on discharge as well as charge it seems, and only sometimes. I’ll see if I can swap the cell over with another, and see if the fault moves to a different cell number in the bms.

Hi Guys, I have a Goodwe GW5048D-ES connected to a Panasonic LinkData PowerWork S2 6.3kwh Li-ion battery. I've recently started to find the battery has switched off over night. After connecting the battery to my computer and logging the pack details, it seems randomly that one cell out of 14 (number 11 for what its worth) spikes in voltage (so all 14 packs will be around the 3900mv mark (as an example, its not specifically this voltage) then cell 11 spikes high enough to trigger OVP on that cell, shutting down the pack. I had it testing today and saw this happen while the logger was running, once the battery had dropped the load cell 11 recovered back to the same voltage as the others after about 5 minutes, then when restarted it went back to working correctly. I'm fairly new to Li-ion technology, but this seems like strange behavior. I wondered if this was even the BMS reading incorrectly perhaps. Any ideas here, would be great to fix this somehow. Thanks, Matt

Thanks - I gave this a go, and worked out what I need, definitely looks like it'll be better with them mounted on the shed. Thanks again!

Secondly is there any issue using standard TPS style cable for this vs the highly stranded and flexible solar specific DC cable? Incase anyone was interested. In NZ at least this is non-compliant. - non-UV rated, cant be confused with AC etc. In my case I need to use the proper stuff it seems. Thanks!

Hi, I've been sitting around reading bits and pieces here for a while. But after starting to play with the gear I've accumulated I've got several queries that I'm going to need some info on. I'm doing this install myself, and gear I've collected used, cheap, free etc. I have a Goodwe 5048es inverter, a 6.8kwh lithium battery. At this point I've got 8 290watt solar panels. (I've also got a 3600watt version of that inverter, and another 24v easun thing that I was trying first. Now the initial question, I've got a reasonable amount of shading on the north roof of my house from large eucalyptus trees. My shed however is in full sun all of the time. (the house shading is most notable in winter (I'm in New Zealand, so the difference between summer and winter is substantial). To me it makes more sense so mount all the solar panels on the shed roof - and run the 40-50m of cable between the house and shed. How much loss would there be from the cables running that distance in terms of percentage using say 6mm cable, or 10mm cable? Secondly is there any issue using standard TPS style cable for this vs the highly stranded and flexible solar specific DC cable? Thanks! That'll get me started if anyone has any commentary?