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SOLAR POWER WHAT IS THE BEST VALUE

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(@stephenwonders)
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Joined: 9 years ago

Ola,

I have searched the forum and found plenty of posts regarding solar power but all of the information seems quite old so I was wondering what the latest advice would be from the forum.

I know that our energy company edp are always selling the virtues of their solar products but I am not sure if there are any downsides that we should be aware of in terms of commitments and long term ties in.

On the other hand I know we could get the company that installed our heating to install solar panels with no sort of contract.

Can we still earn from feeding into the grid the power we do not use, even if we do not have our energy supplier supply the solar panels?

Anyone got experience of this?

 

Obrigado

 

Stephen

 

 

 

 

 

 

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41 Replies




Posts: 67
Community Member
(@comfortapaul)
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Joined: 2 years ago

Hi Stephen, 

We are by no means experts but we've had two large solar panels heating our household water for the last 10 years and just recently had 6 x 375Wp PV panels installed with a GoodWe inverter. We needed to have our electricity meter updated by E-Redes to enable bidirectional power transfer but this was very straight forward.  

We have not gone for a battery storage sysyem at this time but the possibility to update the system at a later date (more panels, batteries) exists.

In the 4 weeks since installation, we have generated 432Kwh.  Not sure yet how this has impacted our electricity usage bill as this is not due until 23rd of the month.

We are still sorting out the feed-in with E-Redes and the monitoring system SEMS (hence the recent need for wifi in the house 🙄).

There are many companies in PT offering PV installation from simple systems, to battery linkage for electric vehicles, to totally off-grid systems.  We went with a company called ENAT as they cover all types of installations should we want to go further than our 6 PV panels.

Hope this assists,

PLL

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6 Replies
Premium Member
(@stephenwonders)
Joined: 9 years ago

Member
Posts: 89

@comfortapaul 

Many thanks for the information. It is very helpful and will help me in the conversations with whoever we asked to supply and fit solar.

 

Stephen

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Premium Member
(@itexpert7)
Joined: 2 years ago

Member
Posts: 255

@comfortapaul 

Thank you for writing about your experience in such detail.

432kWh x 0.15 euro = 65 euros roughly of saving on your electricity bill. Not bad for 6 panels, although it will probably be much less in the winter.
Could be even more if the feed-in tariff is more generous. Do you know how they are paying you per kWh?
In that case I'm wondering why would someone bother with battery, when you can just sell to the grid, and take it back when you need it at night?

I'm surprised you needed wi-fi to make this work.

Did you have to put a "smart" meter that sends data to the electricity company? They have their own network and antennas.

Kind Regards,
Michael.

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Community Member
(@comfortapaul)
Joined: 2 years ago

Member
Posts: 67

@itexpert7

hi Michael,

The inverter has wifi so that you can connect to an app that gives you the production data and diagnistics (ie it can measure output of each panel).

It means that we can look at the app to see how much we are generating rather than having to physically go to the inverter and press buttons.

The connection to the app will also allow us to do periodic reviews of  production, ie compare this month to last month; review annual charts by month etc.

We've been putting off getting wifi for a few years but monitoring the pv generation was deemed 'the straw' or 'the icing' dependant on your view point 😂

Connection to the grid was straight forward. Although we already had a smart electricity meter that was bidirectional, E-Redes said that we needed a newer version installed.

The final step that we are struggling with is the feed-in agreement as it requires creating ourselves as an electricity production entity in the Financas system (economic activity code CAE 35113).  We have an appointment arranged to sort this out.

Hope this assists,

PaulLouiseLottie

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Community Member
(@sonia)
Joined: 1 year ago

Member
Posts: 211

@comfortapaul great information, thank you for sharing.

would it be to much to ask you to keep reporting about this when you have more information. 
i would love to know how it impacted your bill, how much you produced and how much you saved and what you gained by feeding in to the grid.

i would love to put panels in my house so your information is very helpfull.

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Community Member
(@comfortapaul)
Joined: 2 years ago

Member
Posts: 67

@sonia and all others that are interested.

We now have 6 months data since installation of the pv panels.  

Comparing 2021with the same 6 month period in 2020 our billed for usage is on average €10 a month cheaper. Plus, covering the same period we have received a feed in tariff payment of €174 from edp (this works out to € 0.18 per kwh generation).

Please note, it did take edp 6 months to produce the first feed in tariff payment, but now we are receiving monthly rebates.

We do try to use electrical items, e.g. washing machine, cement mixer etc when we are generating electricity so this has helped with the slight monthly usage reduction.

Current estimate is that our panels and installation costs will be recovered in approximately 7 years.

Hope this assists.

Louise & Paul.

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Community Member
(@sonia)
Joined: 1 year ago

Member
Posts: 211

@comfortapaul thank you for the update.

At the end of last year I did a simulation based on my average consumption for the las 12 months to see if I had produced energy what would be the savings, and it amounted to about 12 € a month, it seemed very low, so we decided to shelve the idea for now.

But with your information about the payments from eredes, if I understood correctly they paid 174€ for 6 months, so 29 € / month, this plus the 12 €/month savings looks a lot better.

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Posts: 211
Community Member
(@sonia)
Member
Joined: 1 year ago

My understanding is that nowadays there is no payment for feeding the excess energy to the grid.

With EDP the only benefit is that they offer you a 10% reduction on your electricity, (not the entire bill only the part about electricity consumption).

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1 Reply
Premium Member
(@stephenwonders)
Joined: 9 years ago

Member
Posts: 89

@sonia 

Ola Sonia,

Only 10% wow that's a bit mean. 

For the next couple of years we have got to work in England so the house roof could be generating power and feeding into the grid all day. There must be quite a few properties like that. Not much of incentive from the energy companies.

Then again 10 per cent in better that zero I suppose. 

Obrigado

Stephen

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Posts: 467
Community Member
(@aspidistra)
Member
Joined: 1 year ago

I'm trying to decide what to go for in terms of solar power and am in two minds. An electrician has suggested a couple of the panels that generate electricity would be a good thing but I wonder about having the type that heat water, instead, or whether one can easily have both and how much that would cost to install. 

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Premium Member
(@stephenwonders)
Joined: 9 years ago

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Posts: 89

@aspidistra Bom dia,

Yes we are the same. With the hot water situation - because we are not in permanent residence yet, we wonder if it would be worthwhile yet.

However with generation solar at least energy could be fed into the grid and make a contribution to the national effort to be totally renewable. 

It is something we are trying to find out what the best option will be. 

There is also a government scheme that offers grants for work and improvements on property that will improve the energy efficiency of the property. Our great neighbor Pedro informed us of this and it is something we are preparing to apply for.

ate logo

 

Stephen

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Posts: 211
Community Member
(@sonia)
Member
Joined: 1 year ago

You could have both, but if you have to chose one of them i think the generating electricity ones would be better. 

If you go with the water heating one you will also need a backup water heating system for those cloudy days. But if you have the ones that produce energy you can have an electric water heater that you can program to work during the day when the panels are producing energy and it will also work in cloudy days. also you will have energy for a lot of other things and not only for heating water.

if you do buy in silves and you plan to be living there permanently the solar system is a good option because of the amount of sun in the region

 

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5 Replies
Premium Member
(@stephenwonders)
Joined: 9 years ago

Member
Posts: 89

@sonia Obrigado Sonia, we are not in the Algarve, we are Silver Coasters. We get plenty of sun around Alocbaca but not as much as in the Algarve.

ate logo

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Community Member
(@sonia)
Joined: 1 year ago

Member
Posts: 211

@stephenwonders my reply was to aspidistra post that is looking to buy in silves, but when I'm using the ipad for some reason the forum does not work well and I was unable to direct the response.

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Premium Member
(@stephenwonders)
Joined: 9 years ago

Member
Posts: 89

@sonia I just may get the hang of social media technology one day. 🤔 🤔

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Community Member
(@aspidistra)
Joined: 1 year ago

Member
Posts: 467

@sonia thanks for that. It is sounding like initially some solar ones for electricity are the best starting point.

It's funny, the hot water heating ones have been around for so long, I remember them in Greece 40 years ago, I am surprised they haven’t developed to be more efficient and cheaper. They used to be good for just a couple of showers each day.

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Community Member
(@tygger)
Joined: 5 years ago

Member
Posts: 188

@aspidistra Unfortunately the laws of physics have not changed since Greek Times 😉 the most efficient solar thermal i.e. producing hot water, are the Evacuated Tube panels, but they are more expensive than the flat plate panels.

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