jetlee

Awesome, got it now .. thx

Hey, can you please elaborate on that current calculation with an example .. its not making sense to me ? I assume this could be negative (discharging) or positive (charging) ? But I cant follow your logic ? Thx

The inverter will surge to utility, in short tests, I have seen it go to 8kw.. I haven't tried much higher than that, and do not intend to. It moans a bit by beeping, but it will do it. I feel like we are debating semantics though. My inverter very seldom even gets to 3.5kw, and if it does, its there for a few seconds and then back to a regular load of around 500w. My statement is really just, that while the inverter is under 5kw (its rated load), it SHOULD be able to handle switching between solar / utility / batt without asking the battery for more than 100A, which it appears is not 100% the case.

Thanks Ill give a firmware update a bash, and monitor for a bit. I was hopeful this was a more common problem with a simpler solution like an inverter setting, but it appears a new battery will be in my near future.

Thanks for this. I just want to comment here. I am not off-grid, I (mostly) have a grid (bar loadshedding, which is not when I am experiencing this problem). In the event that I have a utility failure, I agree 100%, the inverter must supply, and should the demand exceed the 100A limit on the battery, yes, I expect a trip or some sort of drama. But, my expectation when utility is available is not the same, and perhaps this is where I am off with my expectation. If I have a fully functional grid, my expectation is that when the inverter is asked for more than its rated power (5kw / 100A at 48v), it should ask from utility, not try to pull the additional load from the battery, and that switch should be handled gracefully.

awesome, glad its working .. good luck

I feel like maybe I havent been very clear, so just to be super clear.. I am not exceeding the 100A draw .. I havent ever gone over about 60A according to my logs. BUt when the inverter switches between battery / utility / solar, its sometimes going into protection mode with a short circuit protection, which I am assuming is due to the capacitors suddenly requiring current when switching. I just want it to be clear, that I am not getting close to 100A yet .. but once or twice a day, even at lowish loads, I can see the battery behave as if it detects a short. No need to answer if thats been understood, I just got the feeling from the replies that there was an assumption that I was getting over the 100A limit on occasion

I used an old straight through cable, and it was wired as follows Orange (pin 2) -> A / D+ Green and White (pin 3) -> B / D-

I didnt search for the files, when it was unrecognized, I just told it to search online for a driver and it installed no problem

OK, had a minute so git my wife to release her laptop driver : ftdi (2.12.36.4) (2021/07/05) driver files ftser2k.sys, serenum.sys, ftcserco.dll, ftserui2.dll worked fine with my batt, did a quick software connect to be sure Hope that helps

Just as an FYI, my linux machine sees it as "Future Technology Devices International, Ltd FT232 Serial (UART) IC"

LOL .. isnt that amazing .. TBH I dont use windows, except for the Narada software .. and thats inside a VM .. My current setup is ubuntu 22 desktop -> virtualbox windows 10 vm with serial passthrough -> Narada software = working Also working, is ubuntu desktop -> cutecom direct to battery .. The other adaptor I had was not a usb -> rs485, it was serial -> rs485, so not the same .. If you like, I can plug it into my wifes windows 10 laptop and run some tests and feed back when I get a gap on the weekend, but the adaptor def works via linux

Just a note for anyone who finds there way here and has a similar problem with the Narada and the older (5KW) Axperts. The error I was getting was the BMS going into short circuit protection. This is most likely due to the instantaneous current draw when switching powers source if the capacitors discharge slightly. So .. running a single Narada is a bit hit and miss it seems .. probably going to order a second one to get it going properly

Sure .. bought this one https://www.robotics.org.za/RS485-MINI , all the others I found were like 300 rand plus, this one with shipping (95 rand in SA) was still cheaper even with ludicrously expensive (proportionally) shipping .. Hooked up to a homemade RJ45 .. Good luck

Hi Coulomb Thanks for the advice, I have read MANY of your responses on this forum, and appreciate that you took the time to reply, I'm sure you spend many hours helping people on this forum. I have a follow up question / comment that could use some clarity. I have yet to update my firmware (current - 74.31) and I know there is an updated version (if I recall 74.40 with the lithium slant), I assume that has no extra bits to soften the cutover? Additionally, there are no settings I can tweak to force the capacitors to stay "more charged" when switching back to battery? This is a little frustrating when I spent 4 years running flawlessly on 100ah of AGM, and after spending the cash, now need to spend more .. so just trying to exhaust as many options as possible, before selling my soul for another Narada 😉 Again, thanks for your reply