Good day everyone, 

I have installed a 3kw Growatt inverter with pylontech 24v battery. The priority is set to UTI. BUT when both sun and grid are available the inverter still uses the battery. And when loadshedding eventually comes battery is only 25%. And defies the whole purpose. I have 2 X 400w panels to the system. 

 

Pls help as I have tried changing these priorities and no matter which one I choose the inverter uses the battery always 

I now have the same Growatt-Pylontech setup. Mine is set on SBU in menu setting 1 and fully charges the battery and maintains charge. Something else must be wrong.

Mine is under menu setting 14 set to CSO having 4 PV panels but SNU may serve you better. If you need to charge solely from grid as priority, it seems under menu setting 14 CUE will serve you better. 

CAVEAT, I am no expert, but having had much trouble with the battery I fist had and after experiencing no after sales support thereon, I learnt a lot on this and other forums. maybe an expert can chip in? I will follow here.

@Pax, thanks for your input I'll verify and change my values like yours and feedback

 

 

Mr T, which Growatt Inverter specifically you have.. I may be of some help, if your using PYRON Tech battery and if your using L1 05 menu, are you seeing on display screen of the Growatt to right side of the Battery Icon a very tiny icon that says L1 symbol ?. One reason its possible if your setting up as Lithium Battery , but the Growatt in not configured correctly with the particular PYLON battery. Protocol, 

 Let me know if I an help. but need more specifics as to Model of Growatt, and Which PYLON Tech Battery

Regards,

Ric

Many thanks it's SPF 3000TL HVM-24 battery is up2500. 

When I select the L1 it gives me error 20 and 04. Only wants to work on USE

 

11 minutes ago, @Mr T said:

Many thanks it's SPF 3000TL HVM-24 battery is up2500. 

When I select the L1 it gives me error 20 and 04. Only wants to work on USE

 

Welcome to the club 😂. What you are seeing is BMS comms error, there is no comms between your inverter and battery. You need to have a look at your cable 

01 - uti

02- 40A

03- apl

04- sds

05- use

06- ltd

07 - tfe 

08-230v

09-50hz

10- 2(even though I only have one battery pack) 

11-20A

12-23v

13- 27v

14-Snu

15- bof

16-lon

17-aon

18-bye

19-28.2v

20- 27v

21-22.0v

22-sbe

2 minutes ago, hoohloc said:

Welcome to the club 😂. What you are seeing is BMS comms error, there is no comms between your inverter and battery. You need to have a look at your cable 

Is the problem the cable? Or this menu setting? 

4 minutes ago, @Mr T said:

Is the problem the cable? Or this menu setting? 

The problem is the cable, you need to make a new one with the last two wires, on battery end, crossed with the first two wires on the inverter end. Pin 7,8 on battery end wired/crimped to pin 2,1 and cut all other wires. Leave Pin 6 wire on battery end still connected 

On battery end, you should have PIN 6,7,8 and on Inverter end Pin 2,1 only 

I will do that and feedback, so after doing that I can go back to settings L1? 

14 minutes ago, @Mr T said:

01 - uti

02- 40A

03- apl

04- sds

05- use

06- ltd

07 - tfe 

08-230v

09-50hz

10- 2(even though I only have one battery pack) 

11-20A

12-23v

13- 27v

14-Snu

15- bof

16-lon

17-aon

18-bye

19-28.2v

20- 27v

21-22.0v

22-sbe

If you not using BMS comms, then I would suggest the following

01- SOL 

05-US2 (this for Lithium batteries)

12-24.5

14-CSO

19- 28.3

20-28.3

21- 22.7

 

5 minutes ago, @Mr T said:

I will do that and feedback, so after doing that I can go back to settings L1? 

yep, once you have made the cable, then you can go back to L1 and BMS will take care of inverter settings for you. BTW, I have used BMS for over a year and US2 for just few weeks and I will never go back to using BMS again. My system works better with US2 

Give it a try and see 

A million thanks!! Everyone

5 hours ago, hoohloc said:

yep, once you have made the cable, then you can go back to L1 and BMS will take care of inverter settings for you. BTW, I have used BMS for over a year and US2 for just few weeks and I will never go back to using BMS again. My system works better with US2 

Give it a try and see 

@hoohloc I fully agree with you, I've tried both options, and I also realized that my system works better on US2, maybe it's a Growatt thing !!!

And I run everything in the house, 3 KW geyser, stove, and all other appliances, after all I have 10 KVA out of the inverters.

I've reduced my consumption from average R 1200/pm to R400/Pm

Bellow screen dump of this month figures. Today has been an excellent day for solar, so far the best day this month.

2 X 5000 ES growatt inverters.

12 X 410 W CSUN 410 W panes 

1 X 100 AH 5.1 KW/h 51.2 V LBSA Battery

4 minutes ago, Antonio de Sa said:

@hoohloc I fully agree with you, I've tried both options, and I also realized that my system works better on US2, maybe it's a Growatt thing !!!

And I run everything in the house, 3 KW geyser, stove, and all other appliances, after all I have 10 KVA out of the inverters.

I've reduced my consumption from average R 1200/pm to R400/Pm

Bellow screen dump of this month figures. Today has been an excellent day for solar, so far the best day this month.

2 X 5000 ES growatt inverters.

12 X 410 W CSUN 410 W panes 

1 X 100 AH 5.1 KW/h 51.2 V LBSA Battery

We have a similar system, I also have 10KW but I'm using the SPF5000TL inverters. I run my entire house from that and I'm extremely happy with the set up. Before, when I was still using BMS, my batteries used to take almost the whole day to charge up and when they got to 100%, the inverters used to switch off PV. Now after changing to US2, around 11:00 my batteries are on 100%. they stay there till around 15:00 and my PV doesn't switch off as often. 

You might want to change your geyser element to 2kw or 1.5kw. Changed mine to 1.5Kw and my geyser can be powered at the same time with my 24000btu AC during the day 

Mr T,

  As a few others are mentioning.

A. your Fault 20 is because the Growatt is not able to communicate with the BMS..

B. Its very possible that your Network cable for the Growatt end needs to swich wire with the BMS end pin pairs.. example but not specific for you. just example is if the BMS of your network Cat5 cable that connects to your PYLON Tech battery is usine #4 pin Blue #5 pin White/Blue Stripe which is called a twisted pair, the Growatt #1 pin White/Orange Strip needs to be connected to #5 pin position of the BMS end, and Pin #2 of Growatt to Pin #4 Blue wire of BMS end.  But first Confirm your Growatt BMS and RS485 ports on the Growatt if pin#1 pin#2 have voltage with ohm meter, should read about +3.32volts,  and or Pin #7 and #8 of the Growatt as well. 

Reason I mention that is my Growatt uses BMS port only, is RS485 only and uses Pin#1 & Pin#2 only +3.32 volts. Your Growatt may be different. 

Also please check out SiliconKid he had the same issues and has a nice explaination and information that may help.. Here is the link: 

You will have success.. Recommend if your handy, take a spare Cat5 Network cable, cut off a 2 foot piece from the rj45 good end, expose the wires, by stripping back the outer insulation by at least 3 inche, caution not to bare any of the pairs of wires internally . now strip 4 wire ends, #1 & 2 pins which should be twisted pair Orange and White orange stripe, and Brown#8 and White Strip Brown pair..  bare the ends, make sure not to have the exposed ends to touch each other while plugged in. Stagger the wire lengths of those that way they can not accidentally touch each other. Now plug into your Growatt ports BMS /rs485 and measure the voltage. DC volts.. ignore if your getting milli-volts. has to be +3.32 or -3,32 Volts DC make sure your multimeter is set for DC volt reading. now you will find out what port rj45 on the growatt and what pins are providing power for the BMS battery. I don't know for your particular BMS Board in your Battery what Pin # it uses.. mine is #4 and #5. yours could be different and you need to know that for the correct cat5 cable connection to work with your Growatt. But check out SiliconKid and what he has, which is similar for You.

Enjoy Best Regards,

Ric

ps. Attached Pic of Growatt Port and Pin layout

RS485 SW Picture BMS.pdf

Mr. T,

  I have looked at your User Manual for your particular Growatt.. I have attached what you may already have seen, but not reconize why your Fault code 20, which simply means BMS and Growatt are not talking - Becasue if you look at the Growatt, One you have to use the BMS port, Two, you see that Pin 1 and Pin 2 of the Growatt is why when cabled with the network cat5 cable the other end to the Can of the Battery is not on the same Pin, you need to take the wires from the  Growatt end rj45 plug which should be Pin 1 verify colors of the pairs and Pin 2 for the Growatt end. A normal cat5 cable generally is Pin1 White with orange strip and PIn 2 solid Orange..  and Pin 4 on the battery rj45 plug will be Blue and Pin 5 is White with Blue Stripe.. 

  Please look at your cable ends colors close and verify which needs to be changed.. I believe you need Pin 1 of Growatt bms end to connect to Pin 5 white/blue stripe to the Can Battery plug end,and Pin 2 of Growatt end to Pin 4 Blue of the Can Battery end. See my picture attached as pdf showing clear Pins of the cable ends. Just cut a short cat5 Spare cable with ends  say cut 10 inchs for the battery side end, so you can remember which end is going to the battery, always and not be mislable because tht end has to be in the battery side. and the longer of the 6 foot cable end goes to the growatt.. the other wires have no value for the Growatt as it only uses Pin 1 and Pin 2 as seen in the Manual.

  See Attached PDF file with pictures, etc. Also remember in the picture I sent of pins locationis back or bottom, fliped over, where Growatt  looking in from top, pin 1 2 and 7 8 look reversed , No its just the back side front side the Pin positions same, u just have keep which side your looking at. the colors of the wires will help keep pin positon always correct.. 

 

SPF3000 HVM Growatt Cable Pins BMS Bat Pins Pic.pdf

Edited December 17, 20213 yr by CaptRic
Amended with added info Newer PDF info

Good people many thanks for all the input, it turned out indeed its the bms cable, the cable I had came wihh one of the previous inverter (axpert) so I used it since it said pylon tech. The pin set up is pin 1 and pin 2 connected at the battery side and to the inverter pin 4 and pin 6. looking at the sketches that were sent its wrong. So I used the USE2 settings provided above until I can make myself the correct wiring for the bms cable. 

Since I have changed those settings, my battery is getting full. And because I'm prioritizing the grid first and this systems is purely back up, it is working accordingly. I will monitor until we have power outages to see if it works proper. 

 

I will also provide feedback on it. I was just on the verge of taking this system down, and because of this forum you saved me lots of headaches. A million thanks please continue to be a blessing to this world. I hot this post will also help someone else in future. 

ToHallo to all 

 

I red all the comments and it help me a lot, I had similar problem on which to use between USE and US2, since I set it to US2, I think all is well.

 

I also need help to hope I will also get it 

 

I am using 3kva Growatt 24v inveter paired with 25.6v Esener.

 

I can see the percentage of the Battery both from the inveter and the Battery (it does not have screen display).

 

1. How will I know(see) what is the percentage of the battery?

2. How will I know how much Battery percentage I have used, DOD?

 

3. Is the any method to know or to calculate it since it's not displayed both from the inveter and the Battery?

 

Your inputs will be highly appreciated

 

Thanks 

 

 

On 2021/12/16 at 10:54 AM, hoohloc said:

My system works better with US2 

I am now on USE mode too. Much more stable in terms of maintaining (float) battery charge than with BMS comms.

Edited April 27, 20231 yr by zsde