Hi Everyone, 

Calling on the PoweForum hive intelligence 🙂 

At the moment I have 10,900W of panels in an East/West split, very slightly over the max DC Power allowed on an Sunsynk 8KW inverter (10,400W) which doesn't seem to be an issue due to the split.

The inverter has Dual MMPT's which can handle a max of 18A & @ 425V (apparently can go up to 500v) or 7650W on each MPPT.

Combined this is obviously well over the 10400w limit.

My idea is that I can add a  4 extra panels to each string (2s2p), staying within my MPPT restrictions and monitor my DC power on the inverter. If my combined Max power generated goes over 10,000W I can automate a disconnect of one off the strings using HASSIO.

Has anyone seen any Smart DC Disconnect switches? 

If not, was thinking that I could use a suitable SSR  controlled by an Arduino/ESP32

Anybody have any alternative ways of doing it? 

🙂 

 

Other alternative is just to go a grid tie which I suspect is probably the safer way of getting more power 🙂 

 

The inverter will just cap the power to the maximum it can take. The problem is over voltage. I don't think you need to anything fancy to avoid the 18a limit

Thanks @phidz ,

Wow, so it isn't going to damage anything as long as my voltages don't go to high, that's good news.

 I thought that I was a risk of damaging my inverter if I went over 10400w.

Will send Keith an email just to get official confirmation before I make any changes but that really would be first prize. 

 

2 hours ago, Sc00bs said:

Thanks @phidz ,

Wow, so it isn't going to damage anything as long as my voltages don't go to high, that's good news.

 I thought that I was a risk of damaging my inverter if I went over 10400w.

Will send Keith an email just to get official confirmation before I make any changes but that really would be first prize. 

 

He has a video on YouTube about mppts that's where I heard him saying that.

Thanks @phidz Will see if I can find the video

 

What if you use micro inverter on the GEN input leg? 

Edited July 23, 20214 yr by Luminous
spelling

Found the video @phidz seems to be pretty conclusive

  

6 minutes ago, Luminous said:

What is you use micro inverter on the GEN input leg? 

Plug it into the Aux port and set it to micro-inverter

 

13 hours ago, phidz said:

The inverter will just cap the power to the maximum it can take. The problem is over voltage. I don't think you need to anything fancy to avoid the 18a limit

Thanks @phidz , you are 100% correct, just got off the phone from Sunsynk support and they confirmed that it is not an issue as long as the voltage does not spike over 450v

8 minutes ago, Sc00bs said:

Thanks @phidz , you are 100% correct, just got off the phone from Sunsynk support and they confirmed that it is not an issue as long as the voltage does not spike over 450v

That's good, at least it has been confirmed