Good Day 

I'm new to Solar. Not sure who can assist. Simple question, but I can't get an answer anywhere. 

We recently installed:

3x Sunsynk 5kw hybrid inverter 

3x Greenwich 5kw Lithium Battery 

20x 470w Panels(9.4kwh)

Our home is 3Phase. It's quite a complicated system. Our panels have no trees/houses obstructing them in anyway. 

The question I have, in the photos attached(Photo 1 & 2 - mostly perfect sunny days), our PV isn't staying consistent. It's moving according to Load, although the Load is much more than the peak of the Solar(meaning the Solar at maximum, doesn't come close to the demand of the load most of the time). It would make sense to follow the Load, if the Load was equal to or less than Solar Input, like in Loadshedding. 

Photo 3, shows how it is supposed to be at all times, excluding cloudy/rainy weather. 

According to me and the installer, it's not supposed to do that, maximum is supposed to come from Solar at all times. I thought it might be a ratio setting, but he said there's no ratio for maximum solar draw at all times. 

If my question sounds complicated, let me know, I'll try to rephrase it. 

Edited May 26, 20233 yr by Solly p

Only things i can think is 

The panels are divided over 3 inverters ie 3phases 

 

Each inverter can only feed it's panels to said phase

 

ie lets say pv

phase 1 4kw 

Phase 2 3kw 

Phase 3 3kw

 

So if load is 5kw on phase1

And 4.5kw on phase 2 

 

It would have to assist from grid on those phases

 

The 3 phases are 3 seperate rails solar from the one rail can't reach the other rails

 

The last phases output goes to waste if no load on that phase

Unless if you set the items to work only from batteries to then refill batteries when load is less 

Or if batteries are pooled and thus if the items are set to only use batteries the last phase can push into batteries and the first two phases can assist from the batteries pulling the power the last phase is pushing into the batteries 

Edited May 31, 20233 yr by Leondavibe

So could also check the load and pv production on each inverter to see if the hypothesis is right/wrong

If it is

either restructure the load  by moving load from the one where loads exceed the panels to the under utilised one

or restructure the solar panels so that more panels are connected to the inverter that carries more load

ie if one inverter carries 50% of the load it should get 50% of the panels

If it isn't at its max yet

 

But yea until you have a setup with an acceptable ballance it will feel like whackamole

 

 

Edited May 31, 20233 yr by Leondavibe

13 hours ago, Leondavibe said:

So could also check the load and pv production on each inverter to see if the hypothesis is right/wrong

If it is

either restructure the load  by moving load from the one where loads exceed the panels to the under utilised one

or restructure the solar panels so that more panels are connected to the inverter that carries more load

ie if one inverter carries 50% of the load it should get 50% of the panels

If it isn't at its max yet

 

But yea until you have a setup with an acceptable ballance it will feel like whackamole

 

 

Thanks. It makes sense. 

I was under the impression, just like the 3x 5.5kw batteries(pooled) provide to the entire load(Essentials), also all 20 panels provide maximum output to the entire load(essentials & non essentials) no matter what phase it's on. 

We have 5 sections(Flats), 5 DB Boards. 3phase is a nightmare with all it's complications.

But thanks a million for the explanation. I'll do further checking on how the loads per inverter/phase output from the Solar. 

Thanks again