SMA SB7000TL-US-22 Inverter - Accessing individual MPPT performance information?

[J.P.M.]

Nice!
It looks like the big voltage sag is due to panel temperature. What kind of panels do you have? What software did you write the application with? Tnx.

Hard to tell, but depending on wind, array location and clearance under the array, that voltage drop doesn't look all that unusual to me.

[DaveDE2]

Nice!
It looks like the big voltage sag is due to panel temperature. What kind of panels do you have? What software did you write the application with? Tnx.

[MinorDeity]

Thanks for all the suggestions. The problem I found with both SB6000TL-US-22s was that even though they were manufactured recently they had the old firmware in them. Once I updated that Modbus became available. I then wrote an application that displays power, current, and voltage graphs for the individual MPPTs in as many inverters as are in the system. Below are some one-day graphs for my single SB7000TL-US-22 system.

[sensij]

My understanding is that modbus is available on all webconnect cards. The item you found is the same as what was installed in your inverter to give you the webconnect access (assuming you are using TCP, not RS-485).

[MinorDeity]

I finally got the Installer passwords straightened out for both my SB7000TL-US-22 system and my daughter's dual SB6000TL-US-22 system, but now I have another concern. My SB7000TL-US-22 was installed just over a year ago and when I use Sunny Explorer to inspect it the External Communication item on the Settings page shows both Modbus and Webconnect. However, both SB6000TL-US-22s only show Webconnect, and they were installed just a month ago. I can't find anything in the SMA documentation that states that the 6000 and 7000 should be different in this regard. Do you know if maybe SMA now provides support for both Modbus and WebConnect by default right out of the box? I'm wondering if my daughter's installer may have dug out some older inverters that only supported Webconnect. If so I need to hit them up for updating them as necessary. I looked up add-on items for the inverters and I found something called the SMA SWDM-10 Speedwire/Webconnect Interface (for a whopping $191) and I'm wondering if I'm going to have to spend an additional $400 for two of those. Besides, I already have the Webconnect part.

[MinorDeity]

Thanks Sensij. Those 6 parameters appear to be just what I'm looking for. Once I can get the Installer PW from my installer (or pay SMA to setup a new one ) I plan to enable Modbus TCP/IP and write an application in C# to log individual MPPT history in a way similar to how Sunny Portal logs the combined MPPT power. As a side note, it looks like we have the same kind of PV panels. I have 30ea. CS6P-260P panels in my system and they are working well (except for the twice/day telephone pole shadow during December and January - So much for Opti-Trac ).

[sensij]

There is some technical support for writing your own Modbus interface on the SMA site here. They've updated it recently to include a spreadsheet with the available registers for each inverter type... super helpful if you already understand how Modbus works.

For your inverter, the following appears to be the only MPPT specific data available:

SMA Modbus Profile
Modbus register address	Short description	Type	Format	Unit	Access
30769	DC current input [1]	S32	FIX3	A	RO
30771	DC voltage input [1]	S32	FIX2	V	RO
30773	DC power input [1]	S32	FIX0	W	RO
30957	DC current input [2]	S32	FIX3	A	RO
30959	DC voltage input [2]	S32	FIX2	V	RO
30961	DC power input [2]	S32	FIX0	W	RO

[MinorDeity]

Hello,
I apologize for posting this to two different forums but after the first post (here) I realized that this was probably the wrong forum, but I couldn't figure out how to delete the post.

I would like to be able to monitor the individual performance information for each of the two MPPTs in my SMA SB7000TL-US-22 inverter. It doesn't appear that there is a way to do this with Sunny Portal, Sunny Places, or Sunny Explorer (is there?) since all I see there is overall inverter performance, but I'm not adverse to writing my own TCP/IP application to communicate with the inverter internals directly through its Modbus interface. However, since I haven't yet researched exactly what can be done at this level, do any of you know definitively if individual MPPT performance information would be available using this approach?
Thanks,
Ray