North East Roof

[Mr Blobby]

Where should I site the panels on our new build?

 

Options are...

 

14 panels on A +

(

   14 panels at B facing  north east

    or

    8 panels at C  facing South West

)

 

Which is best, more panels on roof B facing North East or fewer panels on the smaller roof C facing South-West ?

 

 

We have 3-phase supply into house so not limited to 4KW pv.  Also, we are at home all day with EVs and a battery.  I don't plan to ever get out of bed early to go to work again so early morning and evening generation is not a priority. 

 

My architect and M and E consultants say I should put the panels on the North-East roof.  I'm not so convinced.  Comments please.

 

 

Edited December 1, 2021 by Mr Blobby

[ProDave]

What are the ratings of the panels?

 

For best self use the panels need to be on the phase you are using most.  What is the reason for having 3 phase?

 

My choice would be the 14 panels on A which is probably in the region of 4kWp, on a single phase dual MPPT inverter on your "main" phase that has most of the house loads and an EV charger.

 

Then 8 panels on C which is likely to only be 2kWp on phase 2 with a second EV charger on that phase.

 

Probably not a lot on phase 3.

[Mr Blobby]

1 hour ago, ProDave said:

What are the ratings of the panels?

 

For best self use the panels need to be on the phase you are using most.  What is the reason for having 3 phase?

 

My choice would be the 14 panels on A which is probably in the region of 4kWp, on a single phase dual MPPT inverter on your "main" phase that has most of the house loads and an EV charger.

 

Then 8 panels on C which is likely to only be 2kWp on phase 2 with a second EV charger on that phase.

 

Probably not a lot on phase 3.

 

Interesting what you say about the inverter configuraiton.

 

Agreed, the 14 panels are to go on the front section. 

 

For the panels I was looking at the JA solar 370 panels to give 5.3kW.   I guess the only way it works is for a 3 phase hybrid inverter, and dual MPPT for the other panels at B or C.  That is what I was planning, something like the Solis 8 kW dual mppt hybrid 3-phase model.

I'm assuming here that the inverter will balance the phases.  Otherwise I need to split across single phase inverters with a max 4 kW on each phase?