January 25, 20242 yr Hi guys I have a friend running this setup RTC-AXPERT 5.6k MK4 with Rentech RT 5.0-L battery but currently the coms between the inverter and battery isn't working and he is running it ons USE settings using the volts to determined SOC. Does anyone maybe know how he can setup the coms between the inverter and battery? Thanks in advance.
January 25, 20242 yr 1 hour ago, Jakesvt02 said: Hi guys I have a friend running this setup RTC-AXPERT 5.6k MK4 with Rentech RT 5.0-L battery but currently the coms between the inverter and battery isn't working and he is running it ons USE settings using the volts to determined SOC. Does anyone maybe know how he can setup the coms between the inverter and battery? Thanks in advance. What does the battery manual say?
January 25, 20242 yr Author 14 minutes ago, madness_za said: What does the battery manual say? Will quickly ask him for the manual. He had someone there who made the coms cable according to the manual but it didn't work.
January 25, 20242 yr From the battery manual above you can try the following pinouts - not saying it will work but worth a try INVERTER SIDE BATTERY SIDE PIN 6 CAN H PIN 4 CAN H PIN 7 CAN L PIN 5 CAN L PIN 8 - GND PIN 6 GND Pinouts for MK4 Even if the above is correct - not sure which protocol to use but you can try PYL, LIB and LIC - give it at least 2 minutes - if it starts flashing red with error 61 then it cannot communicate. U can also just continue using USE and setting the voltages for Bulk/Float/Cut-off and just ignore SOC value on the inverter - the battery has LED's showing SOC. Cheers Douw
January 25, 20242 yr 1 hour ago, Douw G. Gerber said: you can try PYL, LIB and LIC An Axpert will not talk Pylontech protocol (PYL battery type) over CAN bus, even though both the inverter and the battery can use CAN bus. If you are going to try Pylontech protocol, you will have to connect wires for RS-485 A and B. I haven't checked if this battery can support RS-485.
January 25, 20242 yr Author 8 minutes ago, Coulomb said: An Axpert will not talk Pylontech protocol (PYL battery type) over CAN bus, even though both the inverter and the battery can use CAN bus. If you are going to try Pylontech protocol, you will have to connect wires for RS-485 A and B. I haven't checked if this battery can support RS-485. Which protocol do you think will be the best or work actually?
January 25, 20242 yr Author 1 hour ago, Douw G. Gerber said: From the battery manual above you can try the following pinouts - not saying it will work but worth a try INVERTER SIDE BATTERY SIDE PIN 6 CAN H PIN 4 CAN H PIN 7 CAN L PIN 5 CAN L PIN 8 - GND PIN 6 GND Pinouts for MK4 Even if the above is correct - not sure which protocol to use but you can try PYL, LIB and LIC - give it at least 2 minutes - if it starts flashing red with error 61 then it cannot communicate. U can also just continue using USE and setting the voltages for Bulk/Float/Cut-off and just ignore SOC value on the inverter - the battery has LED's showing SOC. Cheers Douw Thank you I will send it through to him to try.
January 26, 20242 yr 13 hours ago, Jakesvt02 said: Which protocol do you think will be the best or work actually? That depends on the battery. Some batteries only support one port or the other. Almost all of them support only one protocol. My issue with your diagram is that IF you end up needing RS-485, then these work over different pins to the CANH and CANL pins. The CANH and CANL pins will have a 120Ω resistor there for CAN bus termination; that won't work for RS-485. So the cable should ideally have 5 wires: two CAN bus, two RS-485. and earth. I don't know the battery concerned, so I can't suggest which pins to use on the battery-side.
January 26, 20242 yr 5 hours ago, Coulomb said: That depends on the battery. Some batteries only support one port or the other. Almost all of them support only one protocol. My issue with your diagram is that IF you end up needing RS-485, then these work over different pins to the CANH and CANL pins. The CANH and CANL pins will have a 120Ω resistor there for CAN bus termination; that won't work for RS-485. So the cable should ideally have 5 wires: two CAN bus, two RS-485. and earth. I don't know the battery concerned, so I can't suggest which pins to use on the battery-side. Thanks for the info re PYL protocol - will keep that in mind.
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