Wulff

Hi @Coulomb Sometimes, the obvious stares you in the face, as well as a great idea. I made up a cable. the one supplied most certainly wasn't going to work. the pylontech manual as RS485-B on pin 7 , A on 8 and GND on 6 with this magic box having A on pin 4, B on pin 5 and GND on 8. So I made up said cable with a shaved portion mid sentence to see whats potting. With no plug in the battery, its dead silent. so I'm assuming the battery has to be polled to get a response ( more forum digging in future). However, when I connected up my funky cable, things lit up. from what I can gather , assuming; baud 9600, 8 bit, NO party, 1 Stop bit, the strings being generated are long. (2 hours later) there will be a follow up post. I was pretty sure my cable was right that i made up. since 485 was giving grief, i happen to have a ICC cable for the RS232, plugged that in and at 9600 baud rate on BatteryView, it timed out. but i connected at 115200. Since the BMS box wants 9600 and my jumpers on the pylontech was 0000 and i moved to 1000, turned off battery and back on, id imagine that the baud would be 9600.. Is there a trick to getting these batteries to restart?

Good day I recently picked up a modbus duo BMS from our friends at Rectron which according to its literature is designed to be the intermediate between a 5K and a Li battery that communicates over RS485. According to the literature, connect inverter to RS-232 port, connect battery ( with supplied cable) to RS485 port on battery (has drawing of a US2000 in the literature) to the BMS port and if everything is lekker, the battery symbol on inverter should flash and its all good. To communicate with inverter it has a RS485 modbus port to connect up to PC. Sweet. official product, all should be fabulous. However. few things I hope community can help with. Had to buy a USB to RS422/485 adaptor to get PC to talk to inverter. After setting up modbus comms in WatchPower, I could see the Inverter through the BMS module. Yay. The supplied BMS cable to battery they give pinout is 1-2 to 4-5 , which is not RS485, so I used a good ol straight RJ-45 cable. thus far ive seen no blinky battery icon on inverter. So I'm curious, was there a change in the string structure from inverter with the modified 73.e firmware that the genuine BMS for this inverter no longer understands whats being said? [ WatchPower still works and all settings, etc work so I dont think so, maybe its just a passthrough ] Is there some magic sauce I'm missing? No I'm not using ICC for few reasons, one being no trust, two is cost. This BMS is a 1/5th the price and I honestly don't need the extra bits that come with ICC Is there some clever way of intercepting the comms to see if its talking to the battery and what I would be looking for? (Short of hooking up my Oscilloscope and sniffing the raw binary) I wanted to pick up one of these when i bought the pylontech battery but Aunty Rona was causing nonsense with stock and supply. Any help or Clues would be awesome.

@Coulomb Thank you Sir. just hooked up the US2000 with 73.00e firmware. there was a bit of a wobble at the end of the update.( was rather slow at 8 blocks/s) when i tried to switch off, and on, it didn't want to and it became unresponsive. So i tried to update firmware again, which it did, meaning the MCU was still kicking ( there was some swearing involved for motivation). after some digging on the forum i decided to try these settings for my setup, similar to Mr Johan Smit out 1 utl tot 2 10A InP 3 UPS SAu 4 SdS bAt 5 uSr oLr 6 Lrd otr 7 trE out 9 50hz utL 11 10A b2u 12 46V u2b 13 51V ChG 16 utl bEP 18 bon LCd 19 HEP Llt 20 Lon ALM 22 Aon oLb 23 bYE rEC 25 FEn AbS 26 51.8V FLo 27 50.4V PAr 28 SnG Cut 29 47.5V SoL 30 onE bAL 31 Sbd AbS 32 Aut nEC 38 dlS I do not have solar on my system (for shame, i have 6m^2 of roof space facing north and rest of the house is faving east west at a horrid A frame angle.) so thats why I went with the guess on the settings above. I will be getting a copy of ICC and try get the pylon cable to interface with ICC (if there is ever stock again). thanks again.

Hi there. I stumbled over this thread while trying to get a Pylon US2000 to talk to a axpert 5k, same as Johan Smit. I'm using it mainly as a UPS for running PC and router during outage. i used the link for the 73.00e firmware update and the folder had dsp_LF1_73.00e.hex file in it, but running the update software only lets me use the dsp.hex file. i think i almost bricked the inverter trying to use the LF1 file. i dont see a LFP option in the battery profile, is there some sort of magic sauce needed to get it to work? thanks in advance