Standalone installation without EDF resale

[playmo]

Hello everybody

I have as a project a photovoltaic installation which would allow me to cancel the residual consumption of my house which is about 300Wh.

If there is surplus production, I give it back to EDF (I'm a good prince ), and if not, I take EDF when I need more.

The thing is, I wish I didn't have a 20 year return on investment. I may not be staying more than 5 years where I am.
My choice of photovoltaics is motivated by:
- Lower the cost of home consumption (savings excluding investment).
- Better attractiveness of the house for resale (?).
- Ecology.
- Principle (the less I give to EDF or another company, the better I am, I prefer to spend for myself).
- Pleasure to tinker and personal satisfaction.

So basically, I'm still in the design phase.
The I came across this kit:
http://www.rueducommerce.fr/m/ps/mpid:M ... 83M6624532

It is given for 720Wp (I understand 720Whp). Indeed, the panels are 180Whc.
But I have a question. To have 720Whc, it is necessary to put them in series it seems to me (my college courses are far behind me). Suddenly, seeing that they make 24V, that will give 96V. The regulator being for 12 / 24V, it is therefore not undersized.
Tell me if I'm wrong.
But if I'm not mistaken, it would be mandatory to mount the panels in parallel, then obtaining 180Whc in 24V.


Otherwise another very simple question: At the output of the inverter, I go directly to my box with all the circuit breakers and differentials? I connect to the terminal blocks or there is the EDF power supply and the differential feeders?


FYI, I'm in Seine Maritime. We have more rain than sun, but it should do it anyway I think.
My roof has an inclination of 35 °.

Goods.
Bonne journée.

[Gaston]

Hello everybody

Hello

I have as a project a photovoltaic installation which would allow me to cancel the residual consumption of my house which is about 300Wh.

Good idea...
But you need to familiarize yourself with the units:
- a power is expressed in Watts (W)
- an energy is expressed in Whatts-hour (Wh)
- The power of a panel is expressed in Watt-peak (Wp) which represents the power that this panel can provide under optimal lighting conditions.

The thing is, I wish I didn't have a 20 year return on investment. I may not be staying more than 5 years where I am.

There, it seems difficult to me ...
The production of your installation will save you around 13 cents per kWh produced.

As a first approximation, 1 peak watt produces an average of 1 kWh per year.

Your installation of 720 Wp will therefore produce approximately 720 kWh per year, or a saving of 94 euros per year on the EDF bill.

Yes ... electricity is not (yet) expensive enough

- Better attractiveness of the house for resale (?).

Not sure that a "pirate" installation is a plus for resale

But I have a question. To have 720Whc, it is necessary to put them in series it seems to me (my college courses are far behind me). Suddenly, seeing that they make 24V, that will give 96V. The regulator being for 12 / 24V, it is therefore not undersized.
Tell me if I'm wrong.
But if I'm not mistaken, it would be mandatory to mount the panels in parallel, then obtaining 180Whc in 24V.

If you mount them in series, you will get 720W in 96V and in parallel 720W in 24V
With the inverter chosen, a parallel connection is indeed necessary (this is a drawback in terms of wiring, but an advantage in terms of security. In this case, it is undoubtedly the presence of the batteries which led to this choice. ).

Otherwise another very simple question: At the output of the inverter, I go directly to my box with all the circuit breakers and differentials? I connect to the terminal blocks or there is the EDF power supply and the differential feeders?

Not at all

The kit you give as an example is designed for an isolated site, not to perform network injection.
Besides to do the injection you only have to do the batteries that are in the kit.

Not against, you will probably not find a kit for network injection in France, since it is not approved by EDF (apart from the buyout contracts) ...

[playmo]

Ah OK thanks for the info.

But then to make the injection, what equipment is needed behind the inverter?

For network injection, at EDF level, it seems to me that I have read on certain stations that you have to request or warn them.
They still cannot stop people from making their own electricity. It would be heretical

If not for the power of the blow, how much do I need?
300Wh gives 2600Kw per year, or approximately 344 € (0.1312 € / KW).
I would need 2600KWp of panels ???
There is a part of the calculation that I do not understand.

Yes ... electricity is not (yet) expensive enough

Yes, but as it goes up, the savings (€ 94) will also increase.

[Forhorse]

The material for making "wild" grid injection is found more and more easily ... from the Chinese inverter to the well-known and recognized brand product.
For small powers, we generally use the so-called "micro-inverter" system (one injection inverter per panel)

The kit given on the links is absolutely not suitable for the project, and the presence of batteries ruins any hope of profitability anyway. (the batteries will be dead before the installation is profitable, and their replacement will lead to an installation even less profitable ... etc)

[Forhorse]

Some reading
http://forum.apper-solaire.org/viewsujet.php?t=7341

[Gaston]

Ah OK thanks for the info.

But then to make the injection, what equipment is needed behind the inverter?

Not "behind", but "instead": you need an injection inverter (grid tie inverter in English) and not an isolated inverter.

For network injection, at EDF level, it seems to me that I have read on certain stations that you have to request or warn them.
They still cannot stop people from making their own electricity. It would be heretical

No, they can "just" prohibit connecting to the network (which belongs to them) an unapproved device
You can do whatever you want, but on a separate network ... or as a "pirate" ...

Otherwise for the power of the blow, I need about 3 times more.
So I would need almost 2.6KWp of panels.

Je n'ai pas compris
What power for what purpose

[playmo]

Well I have a little trouble understanding the calculation that I do myself:

I have a device that measures the instant consumption of my house. It saves me from going to the counter.
When everything is off, I have 300Wh (devices on standby, VMC, fridge, coughing coughing).
As a result, the objective of the photovoltaic installation would be to reduce this consumption to 0.

So I need panels capable of giving me 300Wh.
And that gives 2628KWh / year.
It seems huge to me

[Forhorse]

you can never completely cancel this consumption since at night and in case of bad weather it will have to be drawn from the EDF network.

For a "background noise" of 300w (and not 300Wh) you simply need panels and an inverter capable of providing this power (at random I would say something like 400Wp)

However 300w permanently is huge! Before investing in electricity production means, we should perhaps try to reduce this consumption.

[Gaston]

Well I have a little trouble understanding the calculation that I do myself:

I have a device that measures the instant consumption of my house. It saves me from going to the counter.
When everything is off, I have 300Wh (devices on standby, VMC, fridge, coughing coughing).

No, 300W.
What makes a consumption of 300Wh each hour.

As a result, the objective of the photovoltaic installation would be to reduce this consumption to 0.

So I need panels capable of giving me 300Wh.
And that gives 2628KWh / year.
It seems huge to me

The calculation is correct ...
BUT solar does not produce at night ...
In general for this type of installation, one is satisfied with 300W (or even a little more) of panels to cancel consumption of DAY (when the weather is nice).
This gives a production of around 300 kWh per year.

There are 2328 left to pay ...

If you really imagine producing 300W permanently 24 hours a day, then you need a much more complex system and a power of panels of about 24Wp, but above all a means of storage (batteries) which will have to be able to supply this power during long periods (at least 2700 or 3 days in case of prolonged cloudy period).
It is almost impossible to make profitable this kind of installation because the batteries will have reached the end of their life before the electricity saved has reimbursed their purchase price.

[Regismu]

Hello 0 all

then YES it is possible legally to produce to consume ...

yes there is inexpensive equipment and aps pirate and homologous to connect to the network and yes there must be a declaration of production installation to be made on the portal of ERDF .. iv also a declaration of work at the town hall if you els metetz on your roof ..

a link to see all the information and prices of complete evolutive kits according to your good will and / or need (it is a "commercial" site but I have no interest except that it is al that j I bought my equipment) but it is full of links and clear explanations ...:

http://mices.fr/