NicoM

I have just thrown in my 2 cents in the pylon vs hubble debate. A lot of things where said by people that made it pretty clear they have no idea what they where saying. I have to say the design of the pylon is is pretty good. I know they make there own cells and the is most likely the reason for the pouch style of cell being used.

If you want to spec a system you should have the electrical knowledge of where to put fuses and wire the batteries so that no cable in the system goes over its rating and use the proper fuses in the right place. Things like that are taught to you at university and almost any competent electrical engineer worth his salt will know what to do. In the electrical industry no knowledge is same, but a little bit is a very dangerous thing because you don't know what you don't know. Just because it works doesn't mean it is right.

Sorry for brining up an old post. But a 0.5c discharge rate is not a problem if you want to run a load for longer than 2 hours. How long is load shedding ? So if you plan on using it for load shedding it wont be a problem. You have a perfect example of a system that was badly specked by the person who designed it because if he did it right he would have read the spec sheet and known that it might be a problem or he didn't read it and only noticed it afterwards, in both situation it is still his fault for ignoring or not knowing the limitations of the tools he chose to use. Don't get me wrong there are situations where a 1c discharge rate is a big bonus and is needed but that is a minority. Also I have had to use a imax b6 to jump start a hubble that was so badly dischaged it could not start up the inverter that was suppose to charge it.

Has the multi been sold ?

Good day everyone. I"m thinking of installing a solis 1.5kw grid tie inverter at my house but I do not want to feed back. Has anyone used the feed back limiting feature of these inverters and if you have did it play nice with your prepaid meter or did you have to change to a smart meter ? Thank you

Well that's timing for you. Thank you anyway @plonkster.

Good day is there anybody in the Cape town / Paarl area that might be willing to lend me a mk3 or mk2 interface till monday by any chance ?

Now that I read thru this again I just want to point out I'm not saying that's how the axpert measures the dc voltage, just that I have used such a circuit on a small system that I was using for some testing and I could get the voltage reading pretty much spot on with an arduino and a ads1115 (a 16 bit adc ) while I had an charger on it as well as with a inverter as a load.

Ok that makes sense. Well I have to admit I did not know about that. This is the part that I just don't get if you have a bms that can give you a accurate soc and also the needed hardware and firmware to read said soc why not use it ? I would love to know the reason that it has not been implemented. This is the part where my head starts thinking of all the reasons why it has not been changed to work with soc when pylon is selected as the battery type. Now I'm also very curios of what causes this drift in the voltage reading. As a differential adc with a good low pass filter should not have a problem with the 50Hz noise.

@Centurionsolar Thank you for your reply. Ok so looks like I will be going the icc route as well then. It will be used off grid with no generator back up so it will only really be there to stop over discharge of the pylons. Now I have to ask what is the use of the bms port on the king and vm iii if it doesn't really do anything ? or is a firmware fix still on its way ?

@Dex_ Thank you. I have read a thew threads on here but most of them are a bit older. I know that pylon has approved the axpert inverters even if there is no comms between the bms and the inverter. But now i want to know what happens when the pylon shuts off because of fault while the mppt is going fill tilt. I know for a fact that the blue stuff can survive it but will the axpert ? This was something that I believe comms between the bms and inverter was suppose to address or am i thinking of something else ? or has it just not been implemented yet ?

Good day everyone. OK so I have heard that the new Axpert King series supports direct comms with the pylontech batteries. Does anybody have any first hand experience with such a setup ? Also is there any problem with running them close to the there max rating (lets say around 4.5KW ) ?

@seant Thank you very much for the advise. I just have to wait for all the toys to arrive. I will keep this thread updated.

I have 20 tp4056 boards on the way i will rather then wait for them to arrive. The bulk of my charging will be done outside in a small brick enclosure that is away from anything that can burn. I have out of curiosity overcharged a fairly large pouch cell just to see what would happen if a cell does go up in smoke. I have to say you get some respect for these cells when you see that thing go off, the whole enclosure was black on the inside and the wire was melted but that was all as soon as the cell had finished burning the smoke stopped as there is nothing there to burn. i have a video but it is about 1.2Gb as i had to wait for the cell to do its thing. As far as i know the Opus BT-C3100 V2.2 can check the internal resistance, i will confirm as soon as it arrives tho I may be wrong. My first pack will be small in the order of 2 or 3 kwh and then the next one will be a big boy. I have had my fair share of accidents (most painful was getting a zap from a camera flash cap ) and have learned when in doubt take it outside.

I have to ask why will you only be able to do 10 a day ? I have an imax b6 on the way for my charging as i will be charging 8 in parallel ? My discharge testing will be done with the 4 cell opus units so i will be looking at doing around 24 cells a day, fun part about being a student so I'm at home a lot of time and the max discharge time is about 3 hours at the normal 1 amp rate. I also have lots of the lipo pouch cells to play around with, thinking of making a small 4s pack as a mobile power source.