Generator or Inverter for residential use?

wingnut771

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Hi, quick question for you guys. We may be moving to a new house soon, and I want to install an inverter system with PV panels. However, the pitch of the roof is running about 10 degrees off north-south, so the sides of the roof are facing almost east-west. Will this have an impact on the solar production and how big? I assume the one side will get more sun in the morning and the other more in the afternoon?

There is a smaller roof area that is facing almost North, would it be better to put panels on there? This is far from the main DB though.
Perfect use case for sunsynk dual mppt.
mppt1 for east
mppt2 for west
 

RonSwanson

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May 21, 2018
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Hi, quick question for you guys. We may be moving to a new house soon, and I want to install an inverter system with PV panels. However, the pitch of the roof is running about 10 degrees off north-south, so the sides of the roof are facing almost east-west. Will this have an impact on the solar production and how big? I assume the one side will get more sun in the morning and the other more in the afternoon?

There is a smaller roof area that is facing almost North, would it be better to put panels on there? This is far from the main DB though.
It will work in an East/West config, but the effects of winter on production will be far more pronounced than a normal North-facing install. How big is the smaller roof area wise? Can it take 3-6 panels (enough voltage to kickstart and maintain the MPPT)? If so, then you may consider additional MPPT controller / small string inverter (for a total of three MPPTs). If not, maybe a micro-inverter on an Aux port.
 

furpile

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Perfect use case for sunsynk dual mppt.
mppt1 for east
mppt2 for west

It can be done using a single MPPT with the East and West PV arrays setup as two separate strings.
Thanks, this will work.

It will work in an East/West config, but the effects of winter on production will be far more pronounced than a normal North-facing install. How big is the smaller roof area wise? Can it take 3-6 panels (enough voltage to kickstart and maintain the MPPT)? If so, then you may consider additional MPPT controller / small string inverter (for a total of three MPPTs). If not, maybe a micro-inverter on an Aux port.

The smaller section is still quite big, can probably fit quite a few panels on there. But it is a separate flat so the wiring could become complicated to get it to the main house.

Also still thinking if the flat should be on the same inverter system or to install a smaller system just for the flat. The geyser and other high current appliances for the flat makes it more difficult to cater for, since you don't want all of that going through the main inverter as well. Not sure at this stage how the wiring was done and if it is possible to add additional wiring runs, will need to check it out.

Thanks for the feedback guys. Will start planning in more detail once the move is closer to reality.
 

Neuk_

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Thanks, this will work.

Pleasure ;) Due to a lack of North facing roof space as well as tree shade, we went for an East/West PV array configuration using a single MPPT. It works fairly well, winter is a bit of an issue but that is also due to shade issues we don't get in summer due to the sun's 'inclination' in winter. Once we have proper batteries I plan on adding additional PV capability to lessen the extent of winter and boost maximum PV capability.
 

furpile

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Pleasure ;) Due to a lack of North facing roof space as well as tree shade, we went for an East/West PV array configuration using a single MPPT. It works fairly well, winter is a bit of an issue but that is also due to shade issues we don't get in summer due to the sun's 'inclination' in winter. Once we have proper batteries I plan on adding additional PV capability to lessen the extent of winter and boost maximum PV capability.
This roof won't get any shade, there are no trees next to it. So the one string will get more production in the morning, they will balance over midday, and then the afternoon the other string will produce more?
 

Neuk_

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This roof won't get any shade, there are no trees next to it. So the one string will get more production in the morning, they will balance over midday, and then the afternoon the other string will produce more?

Yep, pretty much, it also means we start generating the first few Watts before 06:00 and the last after 18:00 in the middle of summer.
 

system32

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tRoN

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My journey has started

4411b0c96c99d0384f45db8c8f39edbb.jpg
 

AchmatK

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Dec 8, 2009
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Durban Solar
Ok not same company. Maybe they used same supplier.

Enjoy the uninterrupted power.
@tRoN should post all the issues with his install I've picked up after everything has been corrected. I've been assisting him remotely from Cape Town over the past week. Some are small and other are more concerning.

Not understanding the sunsynk inverter and its capabilities and features results in an install like his. It should be resolved soon though as the installer is engaging with him in fixing everything.
 

wingnut771

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@tRoN should post all the issues with his install I've picked up after everything has been corrected. I've been assisting him remotely from Cape Town over the past week. Some are small and other are more concerning.

Not understanding the sunsynk inverter and its capabilities and features results in an install like his. It should be resolved soon though as the installer is engaging with him in fixing everything.
Why don’t you say what was done wrong? This way we know what to look for.
 

AchmatK

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Why don’t you say what was done wrong? This way we know what to look for.
Not sure if we've picked up everything yet.

1. CT coil installed inside the inverter. This defeats having the ability to send any excess to the non essential loads. It should be installed on the live wire after the meter.
2. Negative and positive battery cables going to inverter on the same battery instead of the negative on the bottom battery in the bank and positive on the top battery in the bank.
3. Only using one set of pylontech battery cables on a bank of 4 x US3000 pylontech batteries where it should be two sets of battery cables.
4. Battery cable from battery disconnect to inverter possibly under sized at 25mm and it should be 35mm minimum.
5. Not clearly letting the owner know what circuits are on essential and what is non essential. Owner basically has to simulate load shedding to see what circuits are getting power from the inverter.
6. Battery communication cable in link port 0 on master battery instead of can port. There was no communication between battery bms and inverter.
 

RonSwanson

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May 21, 2018
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Not sure if we've picked up everything yet.

1. CT coil installed inside the inverter. This defeats having the ability to send any excess to the non essential loads. It should be installed on the live wire after the meter.
2. Negative and positive battery cables going to inverter on the same battery instead of the negative on the bottom battery in the bank and positive on the top battery in the bank.
3. Only using one set of pylontech battery cables on a bank of 4 x US3000 pylontech batteries where it should be two sets of battery cables.
4. Battery cable from battery disconnect to inverter possibly under sized at 25mm and it should be 35mm minimum.
5. Not clearly letting the owner know what circuits are on essential and what is non essential. Owner basically has to simulate load shedding to see what circuits are getting power from the inverter.
6. Battery communication cable in link port 0 on master battery instead of can port. There was no communication between battery bms and inverter.
That's quite horrifying. It would be one thing if they were just normal plain electricians, but they have "Solar" in their name, so one expects a certain level of competency when it comes to batteries, CT coils and documenting stuff. Did they give the owner a CoC?
 

Sayf777

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Not sure if we've picked up everything yet.

1. CT coil installed inside the inverter. This defeats having the ability to send any excess to the non essential loads. It should be installed on the live wire after the meter.
2. Negative and positive battery cables going to inverter on the same battery instead of the negative on the bottom battery in the bank and positive on the top battery in the bank.
3. Only using one set of pylontech battery cables on a bank of 4 x US3000 pylontech batteries where it should be two sets of battery cables.
4. Battery cable from battery disconnect to inverter possibly under sized at 25mm and it should be 35mm minimum.
5. Not clearly letting the owner know what circuits are on essential and what is non essential. Owner basically has to simulate load shedding to see what circuits are getting power from the inverter.
6. Battery communication cable in link port 0 on master battery instead of can port. There was no communication between battery bms and inverter.
Thanks for the breakdown AchmatK, you should provide a hourly service as a side job. How does one simulate load shedding as I'd like to test whats on essential myside?
 

AchmatK

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Messages
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That's quite horrifying. It would be one thing if they were just normal plain electricians, but they have "Solar" in their name, so one expects a certain level of competency when it comes to batteries, CT coils and documenting stuff. Did they give the owner a CoC?
I think CoC and payment of the balance still needs to happen so he has some recourse in getting it resolved.

This was their first sunsynk install having only done victron and Goodwe and insisting you need two CT coils like with Goodwe for the inverter to read essential and non essentials. They just took all the extra wire of the CT and rolled it up inside the inverter. Fortunately not cutting the CT wire.

The main DB is 5m from the inverter so it should be an easy fix.
 
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