Good day all

I am new here and need help with solar panels. Thus far I have acquired 2 x Revov 10kw/200ah batteries and a Deye 8kw inverter.

What I understand about the inverter is that it has 2 MPPTs, which can take 2 strings each. The plan is to have 6 x 450w panels on one string, facing East and 6 x 450w panels on the second string, facing West.

The remainder of the required power (to reach the inverter's max input) will be from panels facing North on strings 3 and 4 and this is where I need help with the calculations. My understanding is that each string,s panels will be connected in series.

Hi

You are correct, each string needs to be connected in series. For the north-facing panels, if you are connecting 450W panels, you can connect 2 strings of 7 panels each to make 10400W max.
(450X5) + (450X5) + (450X7) +(450X7) = 10800w

It would be preferable to put more panels on the north-facing side to get the most efficiency.

You could also use larger panels ( 550W) and fewer panels.

(550X4) +(550X4) + (550X6) + (550X6) = 11000W, which should be good as you never reach the rated max of the panels.

You can play around as you have the idea, and the east-west panels will not be as efficient as they get less sun, so you can increase the total watts.

Edited April 22, 20251 yr by Peter Topp

4 hours ago, Peter Topp said:

It would be preferable to put more panels on the north-facing side to get the most efficiency.

I disagree. Rather have power early and late with east and west panels. But make sure that there is no shading in the identified locations. Especially optimise for winter sun.

Hi Frivan

You are correct if you want an even spread of power throughout the day.

Edited April 22, 20251 yr by Peter Topp

17 minutes ago, Peter Topp said:

Hi Frivan

You are correct if you want an even spead of power throughout the day.

If one has enough storage or load during the day the north still gives a much higher yield as you suggested. 😀

5 hours ago, Peter Topp said:

You are correct if you want an even spread of power throughout the day.

To illustrate my concern: my previous house has some panels facing north east and they are positioned high on the roof. That string now starts gradually producing power at 07:00. At my current place, I have a string facing more north than east. However, a tree is casting a shadow on them in the early morning. They only get going at 09:00. It isn't a lot of power we are talking about early in the morning but I hate having to wait.

13 hours ago, frivan said:

To illustrate my concern: my previous house has some panels facing north east and they are positioned high on the roof. That string now starts gradually producing power at 07:00. At my current place, I have a string facing more north than east. However, a tree is casting a shadow on them in the early morning. They only get going at 09:00. It isn't a lot of power we are talking about early in the morning but I hate having to wait.

Can one blame the tree causing the more north to only start working from 09h00?

The same reduction would cause a say east string with a tree shadow - not so?

So many variables to consider that makes a huge difference between installations that can mostly if not at all times explain the reasons why yields differ big time.

4 hours ago, Scorp007 said:

The same reduction would cause a say east string with a tree shadow - not so?

Shading is a problem on all panels. However, panels pointing away from the sun are effectively in shade.

See below the effect that 90 degrees have between string currents: