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Solar panels
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24-07-2018 1:27pm#1
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If you want to save the planet, yes if you want to save money probably not.
We are only trying to save the humans, the planet is more resilient.
10k a battery
(worth an extra €6k if you can hang it on a wall)
I hope that salesman bought you dinner first...;)
Solar is the most affordable way to power an installation without utility facilities.0 -
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Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,603 Mod ✭✭✭✭
Join Date:Posts: 12301
Sir Liamalot wrote: »We are only trying to save the humans, the planet is more resilient.
I think that most people in the ROI that install PV solar panels in a domestic install are doing it because they care about the environment. The return on investment is so long in most cases that I can’t see why else they would do it. There are of course a few exceptions, but not many.10k a battery
(worth an extra €6k if you can hang it on a wall)
Not sure what you mean. Are you referring to Tesla’s offering?Solar is the most affordable way to power an installation without utility facilities.
I don’t think it is as black and white as that.
There are many variables.0 -
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You would require an acre of solar panels (slight exaggeration, but not much).
20kWp would charge most fully depleted car batts on the market ona good day.
200m² ± array.Not sure what you mean. Are you referring to Tesla’s offering?
That and the rest of the bandwagon.
^ 45kWh battery, delivered from Poland complete with recombinant gas and minimal upkeep, auto levelling, low maintenance watering system & automated anti-stratification device.0 -
Are you sure it’s 48Kwh? Quote just says 48vSir Liamalot wrote: »20kWp would charge most fully depleted car batts on the market ona good day.
200m² ± array.
That and the rest of the bandwagon.
^ 45kWh battery, delivered from Poland complete with recombinant gas and minimal upkeep, auto levelling, low maintenance watering system & automated anti-stratification device.
Does the 630 mean 630w so 4.4 kWh0 -
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Can you show the calcs?
I’m intreseted in seen how they come up with 45 kWh with only 24 cells
875Ah (battery Capacity @ C80) x 2.1V x 24Cells = 44.1kWh±A 200m² array?
This would be an issue for many houses. I don’t have enough roof area facing south.
It's a lot smaller than an acre!
Use a hybrid system if you haven't the real estate. East, South, West and Horizontal are all good options.
Realistically few people will use more than 30% of an 80kWh battery in their daily commute. ....I'd be highly confident car manufacturers have inflated the battery capacity figures anyway let's say moot point compensating for efficiency looses.0 -
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Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,603 Mod ✭✭✭✭ Join Date:Posts: 12301
Sir Liamalot wrote: »It's a lot smaller than an acre!
Agreed, this is why I said "slight exaggeration, but not much".
200m² may as well be an acre for most people.
I don't see charging electric vehicles with solar panels in domestic installations catching on in this part of the world. Apart from the cost benefit analysis unlikely to work out few would have the roof space and then there would also be planning required for something this size I would imagine.0 -
A 2000% overspec is a large amount in my book but maybe I'm splitting hairs...
You get between 3 and 6 times the rated power in energy from solar that is well sited, most of the year, is all I have to say, the rest is application dependant.
IIRC you need planning permission for >6 modules.0 -
Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,603 Mod ✭✭✭✭ Join Date:Posts: 12301
Sir Liamalot wrote: »A 2000% overspec is a large amount in my book but maybe I'm splitting hairs...
Not splitting hairs, just labouring the point.
Once again, the acre reference was an exaggeration.
I am still of the opinion that installing solar panels on houses to charge electric vehicles just won't catch on, which is my main point.0 -
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Chauffe, Marcel, chauffe!Join Date:Posts: 64448
Although I agree that electric vehicles are the future chargeing then from solar panels mounted of the owner’s home has not caught on and won’t in the near future.
Agreed that it hasn't caught on. The whole EV business hasn't caught on here, with only 0.1% of current Irish private cars being EVs (one of the lowest percentages in Europe)
And most EV owners charger their cars up at night at a very cheap and very green (lot of it from wind) 7c/kWhHave you done this in your home?
If not why not?
I have installed 2 arrays of solar PV in my home since I got my EV. These are used for my high background electricity use at the moment (and not for charging my car). I do plan to install more PV in the very near future (before next summer) and hope to either charge my car with it, or sell it back to the grid, or bothMy ads on adverts.ie
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Agreed that it hasn't caught on. The whole EV business hasn't caught on here, with only 0.1% of current Irish private cars being EVs (one of the lowest percentages in Europe)
And most EV owners charger their cars up at night at a very cheap and very green (lot of it from wind) 7c/kWh
I have installed 2 arrays of solar PV in my home since I got my EV. These are used for my high background electricity use at the moment (and not for charging my car). I do plan to install more PV in the very near future (before next summer) and hope to either charge my car with it, or sell it back to the grid, or both
Any chance you could post up exactly what you have?0 -
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Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,603 Mod ✭✭✭✭ Join Date:Posts: 12301
Agreed that it hasn't caught on. The whole EV business hasn't caught on here, with only 0.1% of current Irish private cars being EVs (one of the lowest percentages in Europe)
Even within that small group that have EV's charging from solar panels has not caught on no matter what way you look at it.
I think that the cost benefit analysis would demonstrate that there are quicker ways to get a return on your investment.I have installed 2 arrays of solar PV in my home since I got my EV. These are used for my high background electricity use at the moment (and not for charging my car).
Fair enough.
Do you know anyone in a domestic installation that has installed enough solar panels to charge a car? I certainly don't and I believe that this is due to the cost and size of the array required, which is my central point. Do you agree with me on that?
I know that an acre sized solar array is not required to charge the average EV. This is why I consistently described this as an exaggeration, so lets take that as read. However, it will require a larger array than anyone is prepared to install in a domestic installation to date in Ireland with perhaps only one or two exceptions (if even that). So we can argue back and forth about the size of the array required, but my point still remains.0 -
Chauffe, Marcel, chauffe!Join Date:Posts: 64448
Muhammad CoolS Radium wrote: »Any chance you could post up exactly what you have?
I have 2 arrays of 3 panels each. Both DIY installs on my shed and on my kitchen extension.Do you know anyone in a domestic installation that has installed enough solar panels to charge a car? I certainly don't and I believe that this is due to the cost and size of the array required, which is my central point. Do you agree with me on that?
Nope. The minimum charge most EVs take is 6A. You will need just a 5 panel array to produce that (that's the token array they stick on new houses these days) on a bright day. It would charge your car up for the 5kWh you need for your average daily mileage in about 4 hours
Again, obviously not on a dark winters day. But you get my drift. A reasonable array of say 3-4kwp goes a long way to providing for your day time elecricity needs including charging your EV, running dish washer, washing machine, dryer, hoover, lawn mower, etc. for most days of the year. Some people divert the excess to heat water, but I'm no fan of that, as it is very inefficient. I also have a large Kingspan 40 tube solar thermal setup for that as we use a lot of hot water (family of 5 with 4 women) My ads on adverts.ie
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Chauffe, Marcel, chauffe!Join Date:Posts: 64448
Let’s talk average kWh delivered @230 volts ac per 24 hour period in ireland with your 8 m sq. array (accounting for losses).
You see that's where the problems arise.
An 8 panel system is 8 * 300 = 2400wp. Which south facing in say Dublin, would generate about 2.4MWh per year. On average that is 6.5kWh per day. More than plenty (including any losses) to charge your car with the 5kWh it needs for its daily drive
But you won't be going very far in winter, in fact you might have to park your EV up for days on end in December and on a good day you might only make it to the shops and back My ads on adverts.ie
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Average would be a 4kWp system.
For a houshold demand of 10kWh a day.
~20m² Array (can be multi-aspect)Let’s talk average kWh delivered @230 volts ac per 24 hour period in ireland with your 8 m sq. array (accounting for losses).
Solar Powah Calculator0 -
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Chauffe, Marcel, chauffe!Join Date:Posts: 64448
That's a 1.2kW system, so you need to double those figures for an 8 panel (2.4kwp) array. So 5.5kWh daily average after all losses (enough to charge your car with 5kWh after an additional 10% loss for charging). But on a really bad day in December you don't get a lot over 0.0kWh My ads on adverts.ie
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. But on a really bad day in December you don't get a lot over 0.0kWh
Oh you do but yer inverter eats it.
My DC coupled solar can trickle charge in Winter.
Direct drive Mwahaha!:p:p
My AC coupled solar uses grid lecky, running as a parasitic load sometimes just feeding the inverter self-consumption.
In December 150Wp DC coupled usually performs better than 550Wp Grid Tied.0 -
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