Hello,
I'm a newbie to renewable energy and solar.
I have installed a 2.7 KW 48 v system with 6 panels 450 W each, Growatt SPF 5000 es inverter, and 4 Lead-acid batteries.

Everything is running smoothly, except that the inverter is not keeping the floating voltage for batteries above 50 v.

While charging the batteries voltage is between 56 and 58 v, but automatically the inverter is discharging till 50 v.

Please check the attached two images

I tried with USE and FLD batteries types with default values but with no success.

Can someone help?

Thank you

Edited January 15, 20223 yr by haissamx

Perhaps you can post all your LCD Program Settings from 1 through to 21.

Are those flooded or gel batteries?

Edited January 15, 20223 yr by zsde

Thanks for the reply,

The batteries are deep cycle tall tubular ones

Number of batteries: 4

Below are the settings

1- sub

2- 60

3- APL

4- dls

5- FLD ( I also tried USE)

6- dls

7- dls

8- 230

9- 50

10- 4

11- 40

12- 48

13- 56

14- snu

15- OFF

16- OFF

17- OFF

18- dls

19- 58.4

20- 56

21- 43.6

Edited January 15, 20223 yr by haissamx

Do you have a grid connection to your Inverter or is it stand alone?
Also check if your codes 12, 13 and 21 are displayed as V or as %. I updated my firmware which is now 040.05 and 041.05 and these codes are now shown on the display as % and up to now I have been unable to get info from Growatt how these percentages relate to voltages.
When you say the float voltage you see is 50V, where do you see it? Is this in zero load condition or is this the voltage right after hitting 100% charge and when the Inverter then goes into discharge mode, irrespective if there is a load or not? 

 

Yes i have a grid connection but not all the time. the electricity in Lebanon is only few hours a day.

The values for codes are not in percentages, it seems i'm still on the older firmware version.

The issue is when hitting 100% battery charge, when there is no source for charging even if there is no load, the voltage is being dropped to 50 V. As it seems for the inverter the maximum voltage for the batteries should be 50 v. 

I really don't have any clue on how to fix it. 

Do you think changing from SUB to SBU would change the behavior?

 

 

9 hours ago, haissamx said:

Yes i have a grid connection but not all the time. the electricity in Lebanon is only few hours a day.

The values for codes are not in percentages, it seems i'm still on the older firmware version.

The issue is when hitting 100% battery charge, when there is no source for charging even if there is no load, the voltage is being dropped to 50 V. As it seems for the inverter the maximum voltage for the batteries should be 50 v. 

I really don't have any clue on how to fix it. 

Do you think changing from SUB to SBU would change the behavior?

 

 

Yes. SUB turns pv off when the batteries are full. The battery voltage then settles down as pv is off. Sbu keeps the pv on so it should float the batteries. 

I have installed a 3phase application using your Growatt SPF 5000 ES inverter. I am currently not using any solar panels on the 3 inverter and only using Grid electricity to charge the batteries.

 

there seems to be a problem in charging  the batteries .  i am using 8x AES nanocarbon batteries ( AGM ) they are 12V 224Ah batteries ( 2 strings = 2x 4 batteries in series ). please find the datasheet attached in the folder above . these batteries need 57.6V charge voltage in settings 19, 54.48V float charge in settings 20. and the problem is that in settings 21 they need to be set at 48.3V to be able to set the batteries at 50% DOD. 

know that the inverter wont let me set the  cutoff voltage more than 45.9V this wil completely empty the batteries and will largely reduce their life.

In settings 05 i am using USE  " user Defined " 

if i use US2 it will let me use a higher cuoff voltage but the problem is that when i use this  mode  the batteries are not charging to the maximum they are stopping the charge at 75%and this setting is only used for LI batteries . 
thank you for your help . 

hello, my growatt 5000es stopped charging the batteries suddenly. just in one day started to charge till 75% and then stopped until dropped to 25% then recharged again and later stopped to recharge. can someone assist plz? tx

On 2022/04/24 at 11:17 PM, CarlosNHM said:

hello, my growatt 5000es stopped charging the batteries suddenly. just in one day started to charge till 75% and then stopped until dropped to 25% then recharged again and later stopped to recharge. can someone assist plz? tx

Hi what batteries do you have?