i found and have configured one parameter in the growatt menu 
accessing the menu through holding arrow up and arrow down at the same time then entering 111 should only be done by some one who knows what they are doing .
please see pics attached . These settings exist in the menu and maybe @Coulomb could assist as he is really in the know about firmware etc .

bAt is for the battery voltage offset and seems to calibrate the correct battery voltage reading .
Gf.d 
IN.4 or inv might be inv calibration
OP
PV might be pv calibation 

19 hours ago, Zimnismoboy34 said:

These settings exist in the menu and maybe @Coulomb could assist as he is really in the know about firmware etc .

Sorry, I've had to abandon any firmware other than Axperts, and have to focus on only a few models of those. It's just too time consuming.

thank you for the response possibly we flying in solo on this one .. 
Any one else care to test and revert with other features and settings these configuration parameters might alter ?

Bump any one else have any info ?

Howzit just saw your post will try change some of those settings on my growatt. 

Sorry to dig up an old thread, anyone ever found out about these settings?  My inverter's LOAD is out by about 50 Watt, I would love to know if these settings could calibrate that.

I've been trying out these settings, my 5000es was initially setup (not by the installer, so presumably by growatt) as

27 CAP = 5.0 (inverter capacity)
29 Grd.v = -0.8 (grid voltage offset?)
30 Bat.v = -0.1 (battery voltage offset?)
31 Inv.v = 0.0 (Inverter voltage offset?)
32 Out.v = 0.0 (Output voltage offset?)

I have modified 30 to -0.1 to -0.4 and now the inverter and battery (voltmeter) both read the same voltage when not charging.

I also modified 31 from 0 to -0.7 and now when charging from pv the voltages match. I think that I'm also charging the batteries at different voltage than before, but I cannot be certain of this.
I'm not sure what 29 means, but I suspect it's the battery offset when charging from grid.

49 minutes ago, TerryE said:

I have modified 30 to -0.1 to -0.4 and now the inverter and battery (voltmeter) both read the same voltage when not charging.

@Zimnismoboy34 Thank you for finding this hidden feature 👍  What a find.
@TerryE My inverter overreads Battery voltage by ,03 to 1V. Checked with Fluke and the BMS reported voltage is spot on. Will give this a go to hopefully get the stupid inverter to have the same V value as the BMS. 
Will start with -0,4V and see how that goes. 

Edit: Just checked mine at it seems the default on mine has been +0.5V ever since I got this 14months ago. Wonder who changed it, or whether this is random from the factory? I guess I'll never know. I just set it to 0 (zero) offset for now. 

 

Edited November 1, 20223 yr by zsde

I found something for SPF 5000ES - Soft start setting 051
https://www.amosplanet.org/how-to-restart-on-spf-5000es-or-spf-5000tl-hvm-wpv/