Solar lights a challenge
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- Someone-Else
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Solar lights a challenge
I really don't think much to solar lights / solar power, it's not the idea that I don't like, its the cost to do it properly and durability.
I can't afford to buy a "solar power kit" (That is big solar panel, battery, inverter and charge controller) But what I can afford is some stuff to run some 12v lights for my shed.
I am going to make a "project" out of this with pictures along the way.
As I said, I can not afford to spend too much so I am going with the following, all from ebay.
Solar panel and controller
Couple of lights
Any suggestions / comments welcome.
I will be using a 12v rechargeable lead-acid battery.
It's purely a test project.
I have NOT got anything yet.
I can't afford to buy a "solar power kit" (That is big solar panel, battery, inverter and charge controller) But what I can afford is some stuff to run some 12v lights for my shed.
I am going to make a "project" out of this with pictures along the way.
As I said, I can not afford to spend too much so I am going with the following, all from ebay.
Solar panel and controller
Couple of lights
Any suggestions / comments welcome.
I will be using a 12v rechargeable lead-acid battery.
It's purely a test project.
I have NOT got anything yet.
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- Argyll
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- big-all
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Re: Solar lights a challenge
so a 20w panel on the average winter day may give you 20-30w over the whole day so would run a perhaps 1amp[12w] 12v bulb for 1.5-2 hours allowing for losses
how much use are you hopeing for ?
how much use are you hopeing for ?
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- kellys_eye
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Re: Solar lights a challenge
Your figures are wrong b-a.
A 20W panel will give (in theory) 20W continuously and over a whole day would therefore put out 20x8(hrs) = 160 watt-hours meaning a 3W LED could run for 50+ hours assuming full efficiency.
If you use a MPPT converter (standard on solar arrays) you maximise the power available from the panels (this is the 'controller' s-e links to) but manufacturers always over estimate their efficiency so only real-world tests will reveal how much you can get from them.
Being the UK the daily sunlit hours can vary A LOT so a figure of 50% efficiency for the solar side would be about right. Conversion is usually very efficient (90%) and batteries are pretty good too these days so perhaps figure for another 80% efficiency there.
Overall the efficiency is 1 x 0.5 x 0.9 x 0.8 = 36% so a stated 20W panel might best be used at levels of 7W. Still, over 8 hours this is 56 watt-hours and for a 3W LED means 18 hours operation from a DAILY charge.
A 20W panel will give (in theory) 20W continuously and over a whole day would therefore put out 20x8(hrs) = 160 watt-hours meaning a 3W LED could run for 50+ hours assuming full efficiency.
If you use a MPPT converter (standard on solar arrays) you maximise the power available from the panels (this is the 'controller' s-e links to) but manufacturers always over estimate their efficiency so only real-world tests will reveal how much you can get from them.
Being the UK the daily sunlit hours can vary A LOT so a figure of 50% efficiency for the solar side would be about right. Conversion is usually very efficient (90%) and batteries are pretty good too these days so perhaps figure for another 80% efficiency there.
Overall the efficiency is 1 x 0.5 x 0.9 x 0.8 = 36% so a stated 20W panel might best be used at levels of 7W. Still, over 8 hours this is 56 watt-hours and for a 3W LED means 18 hours operation from a DAILY charge.
Don't take it personally......
- Someone-Else
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Re: Solar lights a challenge
big-all, as i said its purely a test. I have no expectations at all, other than for it to work for a short time.
It came about because of This post
It came about because of This post
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
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Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
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- Someone-Else
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Re: Solar lights a challenge
UPDATE. I have ordered it, but I have got smaller Lights (less £)
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
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Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
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- big-all
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Re: Solar lights a challenge
winter cloudy days 8hrs off day light 3-3.5w per hour ??
the point i am making is when you need it most you get the least output
yes it may be more but its unlikly to average very much but iff you only expect 3 or 4 and get 5 or six you will be happy need 5 or6 and get 3 or4 you will be dissapointed
the point i am making is when you need it most you get the least output
yes it may be more but its unlikly to average very much but iff you only expect 3 or 4 and get 5 or six you will be happy need 5 or6 and get 3 or4 you will be dissapointed
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- Someone-Else
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Re: Solar lights a challenge
I am not worried, I have mains lighting in my shed, this is just to prove or not if solar powered lighting is any good in the UK (I think not)
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
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Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
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- kellys_eye
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Re: Solar lights a challenge
Solar is 'good' in any place - except for the capital outlay. There are very few situations where you'd break even or come out on top using a solar installation you pay for entirely from your own pocket.
Of course the 'subsidy suckers' that leech off the poorest would probably argue the point.
Of course the 'subsidy suckers' that leech off the poorest would probably argue the point.
Don't take it personally......
- Someone-Else
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For Clarification
I am doing this test just to see if / how (well) it works, I do not need the lighting in the shed.
I have ordered two 10W LED lights (For vehicle use) so one can be inside and one outside.
The solar panel is 20W But I have no intention of running the lights during the day. (So the panel can charge the battery)
The solar panel is "Slightly flexible" (it has no glass or frame) so I am going to mount it on some timber, and fix the timber to a "pole"
I am not expecting any of the parts to arrive until next year.
I am hoping to take lots of pictures.
I know I have chosen cheap bits, but then I don't have a lot of money for this.
I will list costs on the pictures.
I am crap at woodwork.
If you have any questions, please ask.
I have ordered two 10W LED lights (For vehicle use) so one can be inside and one outside.
The solar panel is 20W But I have no intention of running the lights during the day. (So the panel can charge the battery)
The solar panel is "Slightly flexible" (it has no glass or frame) so I am going to mount it on some timber, and fix the timber to a "pole"
I am not expecting any of the parts to arrive until next year.
I am hoping to take lots of pictures.
I know I have chosen cheap bits, but then I don't have a lot of money for this.
I will list costs on the pictures.
I am crap at woodwork.
If you have any questions, please ask.
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
Click Here for a video how to add/change pictures
Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
Click Here for a video how to add/change pictures
Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
- wine~o
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Re: Solar lights a challenge
I've got "solar lighting" in my greenhouse...
Verwood Handyman
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- kellys_eye
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Re: Solar lights a challenge
I've got a solar panel on my head - as my son likes to keep pointing out.
Other than the simplification of not using a mains connection I'd not bother with solar/battery for LED lights as the mains supply is so cheap (comparatively) but fitting them in sheds with no other mains supply is a very useful and practical solution to an issue that many face.
We've been through the figures and know that you'll never save money but the final cost and details of how easy (or not) and efficient (or not) your system ends up being will be interesting to discover.
Other than the simplification of not using a mains connection I'd not bother with solar/battery for LED lights as the mains supply is so cheap (comparatively) but fitting them in sheds with no other mains supply is a very useful and practical solution to an issue that many face.
We've been through the figures and know that you'll never save money but the final cost and details of how easy (or not) and efficient (or not) your system ends up being will be interesting to discover.
Don't take it personally......
- Someone-Else
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Re: Solar lights a challenge
I have made a start. More pictures to follow as and when the kit arrives. Please also note (As I said earlier) I am crap at woodwork. Total cost so far is £0.00 as I have used odds and ends I had laying around. (Which is why the timber has drill holes in it)
- Attachments
-
- Where the "pole" for the solar panel will be secured to. It is to "fill out" the difference between the wall and the roof overhang.
- sp2.jpg (366.9 KiB) Viewed 4258 times
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
Click Here for a video how to add/change pictures
Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
Click Here for a video how to add/change pictures
Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
- Someone-Else
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Re: Solar lights a challenge
The LED lights have arrived
I have two of these. £3.80 each.
The bad news is the solar panel has only been posted today I was expecting it to arrive tomorrow
I have two of these. £3.80 each.
The bad news is the solar panel has only been posted today I was expecting it to arrive tomorrow
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
Click Here for a video how to add/change pictures
Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
If gloom had a voice, it would be me.
Click Here for a video how to add/change pictures
Inept people use the QUOTE BUTTON instead of the QUICK REPLY section
- big-all
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Re: Solar lights a challenge
how many watts are those lamps ??
we are all ------------------still learning