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Post by chrisell on Feb 2, 2023 19:15:51 GMT 1
You got a bargain at 12k.
Current French prices I could just about self install the panels at that price but not the battery. That's assuming I didn't need a scaffold......
Quotes seem to be about 2 grand per kW installed. Or if they put an EDF logo on the Devis 3-4k a kW. Without a battery.
It's about 1k per kW if you self install - although that's quite variable. It varies on varying factors and it's based on much smaller installations.
Theres a concept of only producing what you use - auto consummation. Much smaller installations and based around never exporting at crap rates. In theory self installation payback is 5-7 years. You can get small kits that literally plug in now
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Post by cernunnos on Feb 2, 2023 19:21:37 GMT 1
This is how mine works: 10Kwh battery, 14 400wh solar panels. Battery charges at 16p/Kwh from 00.30 to 07.30. Battery also charges from the panels. If battery is full excess power sent back to grid at 15p/Kwh. The battery will not charge from the grid outside the above hours even if it is fully discharged (actually, it never goes below 10% charge to protect the cells). If panels are producing power at, say, 2kw and we are drawing 3kw then the battery will make up the difference. Only when the battery is discharged and there is no solar power will the system take power from the grid at the daytime rate of 44p/Kwh (Gulp!). This doesn't happen in practice except where the draw is higher than solar plus battery can provide - only when we use the 9.5kwh electric shower So the hierarchy of use is: 1. Solar 2. Solar plus battery 3. Battery 4. Grid To put this in perspective our bill has gone from £160pm to about £50. In summer we should be running at a surplus. I reckon we save around £1200 over the year. Could be more depending on how much we sell back in the summer. Cost £12900 so 10 years to repay at current rates. I can live with that.Furthermore, the system probably adds at least its cost to the value of the house and drops the EPC to the next lower category. So basically you will get your initial costs back in nearly 11 years , but then your system will be 11 years old and the batteries will need replacing plus maybe inverters etc ?
That is the reason we havn't opted for this investment . For €14,500 ( 12900 pounds ) we could get a lot of insulation and a wood burning cooker.
I respect your decision , but don't agree with the maths .
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Post by ForumUser2 on Feb 2, 2023 21:22:05 GMT 1
Very clear and logical. There will of course be unknown variations in the long term but you must be reasonably satisfied with your choice. Did you buy the solar panels and associated control system direct from your electricity supplier? Also, what happens if panels become faulty? Bought from So Energy. Our supplier is Octopus. System prices are now around 20% higher when we ordered last August. Panrels guaranteed 5 years then we are on our own. Battery 10 years.
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Post by ForumUser2 on Feb 2, 2023 21:29:43 GMT 1
This is how mine works: 10Kwh battery, 14 400wh solar panels. Battery charges at 16p/Kwh from 00.30 to 07.30. Battery also charges from the panels. If battery is full excess power sent back to grid at 15p/Kwh. The battery will not charge from the grid outside the above hours even if it is fully discharged (actually, it never goes below 10% charge to protect the cells). If panels are producing power at, say, 2kw and we are drawing 3kw then the battery will make up the difference. Only when the battery is discharged and there is no solar power will the system take power from the grid at the daytime rate of 44p/Kwh (Gulp!). This doesn't happen in practice except where the draw is higher than solar plus battery can provide - only when we use the 9.5kwh electric shower So the hierarchy of use is: 1. Solar 2. Solar plus battery 3. Battery 4. Grid To put this in perspective our bill has gone from £160pm to about £50. In summer we should be running at a surplus. I reckon we save around £1200 over the year. Could be more depending on how much we sell back in the summer. Cost £12900 so 10 years to repay at current rates. I can live with that.Furthermore, the system probably adds at least its cost to the value of the house and drops the EPC to the next lower category. So basically you will get your initial costs back in nearly 11 years , but then your system will be 11 years old and the batteries will need replacing plus maybe inverters etc ?
That is the reason we havn't opted for this investment . For €14,500 ( 12900 pounds ) we could get a lot of insulation and a wood burning cooker.
I respect your decision , but don't agree with the maths .
That's a personal financial decision. We already have a 'C' rated home but there is little we can do to improve heat loss as it is cavity wall insulated, double glazed, attic and floor insulation. And we run a wood burner. All the figures I gave ignore charging the car which I do only from solar. That's probably 30kw per week. Or about £50 a month at capped rates. It's quite likely that during Apr-Oct our electric bill could be zero. But I'm not prepared to state that until a summer has passed. Our son has the same system in a bigger house. His bill has gone from £240pm to £50. Selling back at 15p per unit really has, for him, been a real boon.
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Post by ForumUser2 on Feb 2, 2023 21:36:30 GMT 1
You got a bargain at 12k. Current French prices I could just about self install the panels at that price but not the battery. That's assuming I didn't need a scaffold...... Quotes seem to be about 2 grand per kW installed. Or if they put an EDF logo on the Devis 3-4k a kW. Without a battery. It's about 1k per kW if you self install - although that's quite variable. It varies on varying factors and it's based on much smaller installations. Theres a concept of only producing what you use - auto consummation. Much smaller installations and based around never exporting at crap rates. In theory self installation payback is 5-7 years. You can get small kits that literally plug in now £12900 including kit, labour, scaffolding, warranty and paperwork for the SEG. One point, though, and I'm slightly annoyed about this: If there is a supplier power cut the system shuts down. Apparently a "critical" circuit could have been set up to run from the battery during power cuts at a max 22 amps (to run a ring with router, fridge, freezers, some lights) but that was not offered. Retro-fitting isn't worth the cost or effort. Once power returns the inverter and battery restart automatically.
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Nifty
Member
Posts: 4,968
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Post by Nifty on Feb 3, 2023 10:49:14 GMT 1
With all this business about the supposed danger of electric vehicles and danger of fire and insurance ietc. , I am wondering what type of batteries are used in some off grid power systems, never mind what is going to happen to solar panels when they become defunct.
Who gives a toss anyway?
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Post by ForumUser2 on Feb 3, 2023 17:44:38 GMT 1
With all this business about the supposed danger of electric vehicles and danger of fire and insurance ietc. , I am wondering what type of batteries are used in some off grid power systems, never mind what is going to happen to solar panels when they become defunct. Who gives a toss anyway? When I informed the house insurance people there was no rise in premium. I'm sure there would be a rise if the fire risk increased.
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