Hi All,

I have a stupid question, but need confirmation.

I have a 5kw Deye Hybrid Inverter which has been running for just over a year now. I have 12 x 430W panels in total, 5 facing North and 7 facing West. I recently extended my North facing roof and would like to add a 6th panel to that roof and reduce west from 7 to 6.

While we were building I had to remove 2 of my North facing panels temporarily which left me with about 138V at peak sunlight, this seemed to be too low for the 1 MPPT and produced close to 0W. West were running just fine.

 

My question;

According to the manual the range is 124V to 425V, is this for a single MPPT or for both together? Best world scenario is that both strings produce at peak 576V which puts me over the threshold if the 425V applies to both MPPTs. I know in the real world North and West will not produce together at peak, but the risk is there. If the range is for each of the MPPTs then I am well under the threshold.

So it basically leaves me with 2 Scenarios;

1.  Assuming the range is for both strings put together:

> Put 2 strings in parallel of 3 panels in series on each MPPT, this possibly leaves me with a situation where the voltage is too low. Which I really do not understand as the low end of the range is 124V and 3 panels should produce about 135V to 144V

2. Move the 7th panel from West to North, connect the 6 panels in series on both MPPTs which should produce 288V at peak

My guess is that I can go with scenario 2 as this is basically how it's been running for about a year now.

 

Please Help, I am stuck in my own brain.

 

Thanks

23 minutes ago, JeremyJvR said:

Hi All,

I have a stupid question, but need confirmation.

I have a 5kw Deye Hybrid Inverter which has been running for just over a year now. I have 12 x 430W panels in total, 5 facing North and 7 facing West. I recently extended my North facing roof and would like to add a 6th panel to that roof and reduce west from 7 to 6.

While we were building I had to remove 2 of my North facing panels temporarily which left me with about 138V at peak sunlight, this seemed to be too low for the 1 MPPT and produced close to 0W. West were running just fine.

 

My question;

According to the manual the range is 124V to 425V, is this for a single MPPT or for both together? Best world scenario is that both strings produce at peak 576V which puts me over the threshold if the 425V applies to both MPPTs. I know in the real world North and West will not produce together at peak, but the risk is there. If the range is for each of the MPPTs then I am well under the threshold.

So it basically leaves me with 2 Scenarios;

1.  Assuming the range is for both strings put together:

> Put 2 strings in parallel of 3 panels in series on each MPPT, this possibly leaves me with a situation where the voltage is too low. Which I really do not understand as the low end of the range is 124V and 3 panels should produce about 135V to 144V

2. Move the 7th panel from West to North, connect the 6 panels in series on both MPPTs which should produce 288V at peak

My guess is that I can go with scenario 2 as this is basically how it's been running for about a year now.

 

Please Help, I am stuck in my own brain.

 

Thanks

Let's tackle the problems one at a time for you to reconsider. Each MPPT can accept the range you quoted and not combined.

You need 150V to start the MPPT then 125V. Also each MPPT is/was good for about 13A input. Using 2 strings in parallel per MPPT will give over 30% wastage due to this maximum. Thus stick to 1 series input per MPPT. You can use I guess up to 9 in series without exceeding the specs per MPPT.

More info can be added once you have read this post.

Edited October 22, 20223 yr by Scorp007

2 minutes ago, Scorp007 said:

Let's tackle the problems one at a time for you to reconsider. Each MPPT can accept the range you quoted and not combined.

You need 150V to start the MPPT then 125V. Also each MPPT is/was good for about 13A input. Using 2 strings in parallel per MPPT will give over 30% wastage due to this maximum. Thus stick to 1 series input per MPPT. You can use I guess up to 9 in series without seeing the specs per panel.

More info can be added once you have read this post.

Awesome! thank you so much. Just to confirm, what you are saying is I can run 425V on the North side and 425V on the West side?

1 minute ago, JeremyJvR said:

Awesome! thank you so much. Just to confirm, what you are saying is I can run 425V on the North side and 425V on the West side?

That is spot on. The 2 MPPTs work independently. Can have different volts, amps, and numbers of panel inputs and also panels in different directions.

14 minutes ago, Scorp007 said:

That is spot on. The 2 MPPTs work independently. Can have different volts, amps, and numbers of panel inputs and also panels in different directions.

Perfect, that was my assumption. But I just needed the confirmation, thanks so much for your assistance.