Solar panels kit for self-consumption

Solar Forum Photovoltaic PV and solar electricity generation from direct radiation solar energy.
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I Citro
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by I Citro » 19/11/15, 14:19

chatelot16 wrote:For those who have already done their utmost to reduce their electricity consumption, photovoltaic production for self-consumption is no longer of much use
I do not agree, and I will illustrate my point with the example of a friend who had to choose between paying € 5.000 to connect his wooden house to EDF or equipping himself for € 2000 with a wind turbine, of photovoltaic panels, batteries and inverter.
Every once in a while he gets a better new battery or an additional solar panel, but it costs him considerably less than the privilege of paying a subscription and electricity bills.
Its renewable electricity production is therefore extremely relevant while it consumes very little and is constantly in a situation of overproduction, not being connected to EDF ...

chatelot16 wrote:Then you have to know what you want: by installing a stronger power it will happen more often to give it to EDF, but whatever that increases the savings on your bill anyway because it will produce more in the morning in the evening and the days of low sun

a power installed 2 times too high does not double the return on investment time, it just increases it a little
Again, I don't agree ...
If you are connected to EDF, it is MANDATORY to have an approved installation (safety and consuel standards).
In this case, an electricity buyback contract will be signed with EDF Obligation to Purchase.
Two possibilities,:
1 / Total resale of production (ban on storage and self-consumption)
2 / Resale of surplus (self-consumption of production and resale of surplus).

There will therefore be no electricity supplied as a gift to EDF as you state ...
In addition, a well-negotiated installation (installer, financing, aid and subsidies) pays off faster when its power is high for reasons of economy of scale ...
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by Gaston » 19/11/15, 15:57

citro wrote:If you are connected to EDF, it is MANDATORY to have an approved installation (safety and consuel standards).
In this case, an electricity buyback contract will be signed with EDF Obligation to Purchase.
Two possibilities,:
1 / Total resale of production (ban on storage and self-consumption)
2 / Resale of surplus (self-consumption of production and resale of surplus).
Approved installation is compulsory, but not the resale contract (which imposes additional costs: double meter, ... which cannot be made profitable for a small installation).
Without a contract, we can produce for self-consumption and a possible surplus is offered to EDF.
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I Citro
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by I Citro » 20/11/15, 13:17

It depends on what you want.

A / Clearing its standby consumption in real time and without storage can only erase 20 to 30% because as soon as the sunshine drops, the erasure drops to 0 but not the consumption = "return on investment" sooooooong .. .
The expense will always be excessive compared to the return.

B / Eliminate standby consumption by more than 80% thanks to storage which allows production to be used 24 hours a day even in the absence of sun.
The expense is higher but the return is much better. this work will be very rewarding.

C / Erase standby and service consumption (dishwasher and washing machine, ...) by changing habits ... Companies like DOMO HELIOS offer 1500Wp installations very relevant and profitable without a buyout contract.

D / Start the process of moving towards energy autonomy with 6 to 9kWp or much more with storage.
It is an expensive challenge in terms of investment, but very rewarding.

In all cases, you should know your needs by MEASURING your consumption.
The shop of forum offers everything you need for this. You just have to take readings and compile them in a spreadsheet to identify the consumption of each device.

With us, for example, the 3500W condensing dryer was removed 6 years ago, this frees up energy to power our vehicles (electric cars, electric scooter, electric bike).
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by chatelot16 » 20/11/15, 13:55

citro wrote: Companies like DOMO HELIOS offer 1500Wp installations very relevant and profitable without a buyout contract.


i see that
Self-consumption 3 kWp with storage 6 kWp from € 13 incl.
it starts badly, what does 6kWp storage mean? we can excuse the misspelling, but not the bad unit on a site whose specialty is energy

then 13 euro there is something to save
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by chatelot16 » 20/11/15, 14:03

citro wrote:
A / Clearing its standby consumption in real time and without storage can only erase 20 to 30% because as soon as the sunshine drops, the erasure drops to 0 but not the consumption = "return on investment" sooooooong .. .
The expense will always be excessive compared to the return.


I don't understand your reason: when the maximum power of the photovoltaic is lower than the minimum power consumed by the house, we are sure to value all the photovoltaic production by subtraction on the bill ... the profitability is the same as for sale to EDF ... the only difference is that it's a small gain, but fortunately also a small expenditure
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by Exnihiloest » 20/11/15, 15:54

citro wrote:...
In this case, an electricity buyback contract will be signed with EDF Obligation to Purchase.
Two possibilities,:
1 / Total resale of production (ban on storage and self-consumption)
2 / Resale of surplus (self-consumption of production and resale of surplus).

I did not know (I am only interested in the only alternatives that could make me completely renounce the EDF contract).
Just for my little culture, why these two possibilities, when the two are actually mixed? Because if we sell all the production (case 1), what we consume is still part of what EDF provides, therefore of what we also supplied (joining case 2).
Last edited by Exnihiloest the 20 / 11 / 15, 16: 08, 1 edited once.
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by Gaston » 20/11/15, 16:00

However I agree with chatelot16: with an "undersized" system, we are sure to value all of the kWh produced, (even if it is not much) so the "return on investment" is not no worse than in other cases.

On the other hand Citro is undoubtedly right on the estimate of a maximum around 20% or 30% of the consumption of day before.
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by gil210 » 20/11/15, 18:18

I have just gone through all your comments with great interest! Even if everyone has a different point of view on the means, the debate on the return on investment (or profitability…. Which makes me think more about profit : Lol: ) dominates all the same a little bit….
I put aside the device with storage but I nevertheless retain one of your arguments that I find essential: a low-power installation, inexpensive, for standby consumption, is an idea to dig into.
Indeed, I am of the opinion of I Citro, this should only concern 20 to 30% of the consumption but, on an EDF invoice, 20 to 30% less each month… .. In addition, this standby consumption can be defined as useless and wasted!
Another crucial argument, even if obvious, it is necessary to measure its consumption and assess these needs.
My punctual consumption read on the meter reported 700 W, as said above, without any device running: only devices in standby (refrigerator, box, some lighting). I will make other more precise measurements, in particular with the SPA in working order, it is in fact since the acquisition of this device that my bills have increased a little. I therefore think of turning to a small installation (around 1000W), without a buyout contract in order to lower my bills.
@Gaston The proposal 150 € investment for 16 € per year saved for example seems to me quite suitable.
It remains to negotiate a suitable rate for equipment and installation.
In this regard, should I favor a local craftsman (after checking his reliability) or rather a "box" having a storefront and partner of EDF (there, I am suspicious ... conflicts of interest :frown: ?
What reasonable budget should I budget for 1000W PV?
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I Citro
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by I Citro » 22/11/15, 22:17

A drawing better than a long speech:

Storage is essential to optimize the use of renewable energy...

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by chatelot16 » 22/11/15, 22:33

this drawing shows what is happening to the house of someone who works elsewhere ... he is not at home when the sun is shining

there is a bunch of factories that consume exactly when there is sun ... no need to stock, but need a public service that buys from those who produce and sells to those who need ... and without complicate with absurd fees

currently the absurdities mean that we paid too much for some with subsidy taken from others ... and that we still do not want to buy at normal price to those who could produce at the normal price without subsidy
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