8 hours ago, fvanz said:

I recently bought an InverMax branded VMIII 5K.

Did you perhaps mean Inverex? I've not heard of InverMax for Axpert-like interter-chargers.

8 hours ago, fvanz said:

Does anybody know how the cooling fans on the Axpert VMIII 5K should behave?

The VM III firmware for fan control is rather confusing. There is code to adjust the pulse width for a PWM port, but there is also code that seems to switch the fans on and off. Perhaps one is PWM controlled, and the other is just on or off.

There is some discussion about it in another forum starting here, if you are interested.

On 2020/02/02 at 7:41 PM, Watt_The_F said:

 

 

Thank you for the replies. @Coulomb it is indeed InverMax branded, distributed by www.allpower.co.za. Will have a look at the discussion you mentioned. This fans are driving me nuts!

First off, sorry in case this already has been mentioned or asked before:

After adding a couple more pylontech us2000 batteries to my existing stack which is connected to one 5048GK I see a strange behaviour: The SoC as reported by the Inverter differs from time to time and is up to 30% less as I  being communicated on the CAN bus of the pylontech batteries. I already changed the order of how the plyons are attached to see if it has anything to do with which battery being the master controller but it is still the same.

The past months (before I added some more pylontechs) I only noticed the SoC as reported by the inverter to 1% over the value reported by the battiers on the CAN bus, leading to the Pip reporting 101% SoC when fully charged.

Has anybody else noticed something similar?

On 2021/05/27 at 6:34 PM, data said:

Pip reporting 101% SoC when fully charged

I rarely see 101% too. I am using a Pip-5048MK and was on firmware 71.80 with display 02.00. I upgraded now to 71.94 and display 02.66. Will revert if this issue come up again.

6 hours ago, MJS said:

Will revert if this issue come up again.

I don't see this as a really bad thing. It just means that the SOC estimate was a bit on the high side, and will get corrected once the conditions are right. I would not use that as a reason to go all the way back to 02.00. There has been a lot of software development between 02.00 and 02.66.

On 2021/05/27 at 6:34 PM, data said:

Has anybody else noticed something similar?

 

7 hours ago, MJS said:

Will revert if this issue come up again.

This has nothing to do with the inverter.  The Pylontechs can and do report SOC values above 100% when charging is allowed to continue.  I monitor this at an individual battery level and often see batteries going past 100 when the system is doing a weekly balancing.

8 hours ago, MJS said:

Will revert if this issue come up again.

I meant that I will report should the issue come up again with this firmware.

I am very happy with 71.94 and 02.66. Frist time I have proper switching between utility and battery without having the 2A constant charging. It would just be even better to have switching based on an adjustable SOC value. Apperently SOLPIPLOG does SOC based switching but currently not for PYLONTECH.

I haven't been able to verify that the PV drop is gone with this release.

On 2021/05/31 at 3:29 PM, Calvin said:

The Pylontechs can and do report SOC values above 100% when charging is allowed to continue.  I monitor this at an individual battery level and often see batteries going past 100 when the system is doing a weekly balancing.

Update: I have recently upgraded the firmware in my US3000Bs to 2.8, and this issue has been resolved.  They seem to have taken a different approach to deciding that the SOC is 100% - it now needs a higher voltage to get there (52.9V vs 52.5V previously). There is also no longer a "buffer" above 100 - as soon as you start discharging the SOC (which is rounded down to the next integer value) drops to 99%.

Sadly the ridiculous "feature" of the reported SOC being stuck at 89% during charging is still there.  It is a ratchet effect: it will not go up but it will come down.  Once this offset between real and reported SOC is present it can only be reset by charging to 100% SOC.

Anybody using more than one inverter with one common bank of pylon batteries?

I have two inverters (5048MGX and 5048GK) connected to the same battery bank. The first pylontech module RS485 port is connected to the 5048GK BMS port. At the moment only the GK is used currently providing mains power to the house. The MGX is turned off. When there is enough sunlight, the MGX turns itself on and charges the battery together with the GK. Since there is no BMS connection between the Pylontech the MGX is set to user defined battery and charging/float voltage set to 53.2V

Today afternoon batteries where charged to 100% SoC and after a while I had the warning 69 on the GK - apparently the batteries wanted to do some balancing and were not happy with the other inverter providing a steady 53.2V. After I disconnected the MGX, charging voltage dropped slowly to 51.x volts and increased back to 53.2V after a while.

I already tried to connect the MGX to the RS485 port on the second pylontech but it seems that only the first one is active.   

My question is: How can I use two inverters on one bank and have the pylontech bms communicate to both?

So in case the batteries want less voltage to do their balancing both inverters get to know this and behave accordingly.

 

Edited July 18, 20214 yr by data

Update to my own issue above:

For now, I have reduced the max. voltage of the second inverter to 51.2V. In case the above issue should still occur I'll go even lower to 50.9V

On 2020/02/03 at 12:04 PM, Watt_The_F said:

Thanks for the replies.

If I assume that each RJ45 plug pin is named pin 1 to pin 8 - from left to right - as viewed in the in the pics above, then:-

 

Option A (TomasCrespo)

Inverter <--> Pylontech

Pin 1 <--> Pin 3

Pin 2 <--> Pin 5

Pin 3 <--> Pin 1

Pin 5 <--> Pin 2

(no other pins connected)

 

Option B (Calvin)

Inverter <--> Pylontech

Pin 3 <--> Pin 8

Pin 5 <--> Pin 7

(no other pins connected)

 

Going to give these options a try. Thanks again, much appreciated.

hi guys, found this gem of a post though i am still having troubles with a US3000C talking to mpp 8048 max. tried both wiring configs above but neither seemed to work. wondering if anyone knows if the C version changed things? 

On 2022/03/14 at 10:35 PM, Daz said:

hi guys, found this gem of a post though i am still having troubles with a US3000C talking to mpp 8048 max. tried both wiring configs above but neither seemed to work. wondering if anyone knows if the C version changed things? 

 

  Hello, 

Any success with this ? I've installed a MPP 8048 PIP MAX invertor with Pylontech US3000C and can't get rid of 61 fault code.

Tried, without success:

Inverter <--> Pylontech

Pin 3 <--> Pin 8

Pin 5 <--> Pin 7

 

Thanks!