4kw system?.

Reed_Richards

Spats said:

Hi. 
System is

Ja 330w black panels x 12
Growatt 3.6kw inverter
Solo 2 monitor. 

This is a quote from your first post.  If this is what you were told you would get then you can see that 12 x 330 W is not quite 4 kW and the inverter limits your maximum output to 3.6 kW.  The problem is that this does not seem to have been properly explained to you.

Spats

I am saying that a 4kw system would be installed and that is what I should have got, regardless of the output.

If It gives me 4kw output at some point then I would be happy.

There was no mention that it was only going to be a 3.6 kw system. 

Spats

Reed_Richards said:

Spats said:

Hi. 
System is

Ja 330w black panels x 12
Growatt 3.6kw inverter
Solo 2 monitor. 

This is a quote from your first post.  If this is what you were told you would get then you can see that 12 x 330 W is not quite 4 kW and the inverter limits your maximum output to 3.6 kW.  The problem is that this does not seem to have been properly explained to you.

Exactly mate, it was never explained to me. 

I was told it was a 4kw system that would be installed nothing less.

If the installer had said that it would be less than 4kw, then i had an option of saying yes or no, but that was taken away from me.   

Reed_Richards

Spats said:

There was no mention that it was only going to be a 3.6 kw system. 

If you were told in advance that you would get a 3.6 kW inverter then that is exactly where it is mentioned.  The problem is that you did not know to interpret that to mean that your output would be limited to 3.6 kW.

Spats

Read my post above mate.

arty688

The problem is a lack of knowledge that not explained to the customer. I'm looking at PV at the moment and have researched the area thoroughly maybe OTT so I would say I'm not your average customer. To make PV more mainstream you shouldn't have to do loads of research and thing should be explained a bit better.

Basically to be able to compare panels they need to set a standard unfortunately for you its not based on August in Glasgow. If they were your panels maybe 290w not 330w.

Another thing that isn't explained to people is with inverters bigger is not better and inverters should be less than the panels as this makes them more efficient .

The number you should be concentrating on is the estimated annual output which will be on your quote. Again it not guaranteed as its weather dependent . 

Spats

arty688 said:

The problem is a lack of knowledge that not explained to the customer. I'm looking at PV at the moment and have researched the area thoroughly maybe OTT so I would say I'm not your average customer. To make PV more mainstream you shouldn't have to do loads of research and thing should be explained a bit better.

Basically to be able to compare panels they need to set a standard unfortunately for you its not based on August in Glasgow. If they were your panels maybe 290w not 330w.

Another thing that isn't explained to people is with inverters bigger is not better and inverters should be less than the panels as this makes them more efficient .

The number you should be concentrating on is the estimated annual output which will be on your quote. Again it not guaranteed as its weather dependent . 

This is on the MCS Certificate

Total Installed Capacity (kW): 3.96

Estimated Annual Generation (kWh): 3210.0

arty688

So

Estimated Annual Generation (kWh): 3210.0

that's the number that should reasonably expect so don't get hung up on the 4kw thing, most people do end up generating more than the estimate though, maybe people with PV on this board could comment on that.

arty688

Also you do usually get the sale BS like any other produce like the 50% reduction in your bill. Again this is only from research, without batteries you will be doing well to use 50% of the generated electric. So in this case say 1600KWh with the other 1600KWh being exported @5p ish . Again anyone with real life experience it would be good to hear your input.

Martyn1981

Spats said:

arty688 said:

The problem is a lack of knowledge that not explained to the customer. I'm looking at PV at the moment and have researched the area thoroughly maybe OTT so I would say I'm not your average customer. To make PV more mainstream you shouldn't have to do loads of research and thing should be explained a bit better.

Basically to be able to compare panels they need to set a standard unfortunately for you its not based on August in Glasgow. If they were your panels maybe 290w not 330w.

Another thing that isn't explained to people is with inverters bigger is not better and inverters should be less than the panels as this makes them more efficient .

The number you should be concentrating on is the estimated annual output which will be on your quote. Again it not guaranteed as its weather dependent . 

This is on the MCS Certificate

Total Installed Capacity (kW): 3.96

Estimated Annual Generation (kWh): 3210.0

Hiya, if it helps you with peace of mind, you'll generate more per year with a 3.6kW or 3.68kW inverter connected to your ~4kWp PV array, than with a 4kW inverter.

For highest efficiency and annual generation, the installer would not have done their best if they'd installed a larger inverter and at a higher cost.

Even SMA's (inverter manufacturer with the best reputation at the time) research back in the early 2010's, showed higher annual yield from a 3600TL, v's 3800TL or 4000TL, when linked to a 4kWp system in the UK.