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 Post subject: Solar diy
PostPosted: Wed Jun 27, 2018 2:12 am 
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Looking to create my own diy solar projects

1. Solar jar
2 5w sub led light strip running off solar 5w panel with as battery for storage

Any ideas on best cheap panels kits

With maybe a led controller


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 Post subject: Re: Solar diy
PostPosted: Wed Jun 27, 2018 5:27 am 
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YamYam wrote:
1. Solar jar
2 5w sub led light strip running off solar 5w panel with as battery for storage

Any ideas on best cheap panels kits

With maybe a led controller


I would suggest you do some more research first. The average LED strip is 20w / 30cm so a 5watt solar panel will be of no use. And if its cheap...............

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 Post subject: Re: Solar diy
PostPosted: Thu Jun 28, 2018 7:20 pm 
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someone-else wrote:
YamYam wrote:

I would suggest you do some more research first. The average LED strip is 20w / 30cm so a 5watt solar panel will be of no use.


20W/30cm?

What are you lighting up?


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 Post subject: Re: Solar diy
PostPosted: Thu Jun 28, 2018 7:31 pm 
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someone-else wrote:
YamYam wrote:
1. Solar jar
2 5w sub led light strip running off solar 5w panel with as battery for storage

Any ideas on best cheap panels kits

With maybe a led controller


I would suggest you do some more research first. The average LED strip is 20w / 30cm so a 5watt solar panel will be of no use. And if its cheap...............


Ones I have seen are usually 3-5W per metre.


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 Post subject: Re: Solar diy
PostPosted: Thu Jun 28, 2018 9:06 pm 
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:oops: I was looking at the wrong part of the spec, but even so the good strips are around 8 - 10 w / Metre.

Besides, you can't charge a battery AND run LED lights if the LED lights are the same wattage as the solar panel, not to mention that solar sounds good, but often isn't.

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 Post subject: Re: Solar diy
PostPosted: Thu Jun 28, 2018 9:19 pm 
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a 5w solar panel will probably average less than 1w for say 10 hrs when you actually need it in the winter

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 Post subject: Re: Solar diy
PostPosted: Thu Jun 28, 2018 10:44 pm 
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big-all wrote:
a 5w solar panel will probably average less than 1w for say 10 hrs when you actually need it in the winter


Maybe, but don't "spoil it" its solar, its got LED's its going to have a battery, its going to be sunny all the time, its going to have a massive 5 watt solar panel, its going to work, yeah you are right its :sad:

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 Post subject: Re: Solar diy
PostPosted: Fri Jun 29, 2018 12:03 am 
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someone-else wrote:
big-all wrote:
a 5w solar panel will probably average less than 1w for say 10 hrs when you actually need it in the winter


Maybe, but don't "spoil it" its solar, its got LED's its going to have a battery, its going to be sunny all the time, its going to have a massive 5 watt solar panel, its going to work, yeah you are right its :sad:

a self supporting system will need a large battery off perhaps 5-10 times the daily expected average use to allow for overcast or more than average use in winter months so perhaps a 45-90ah battery
you could perhaps use a 16-20ah battery with" take home and charge if required " an easy option as a top up

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 Post subject: Re: Solar diy
PostPosted: Fri Jun 29, 2018 5:29 am 
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big-all wrote:
a self supporting system will need a large battery off perhaps 5-10 times the daily expected average use to allow for overcast or more than average use in winter months so perhaps a 45-90ah battery
you could perhaps use a 16-20ah battery with" take home and charge if required " an easy option as a top up


It's not that hard to guestimate everything and not be far off, the "problem" if you will, arises when you start to add the cost of everything, its not worth it for the average diy person.

Not far from where I live there is a smallish roundabout and the council took out all the mains lights to illuminate the direction arrows and replaced each one with solar light and a large solar panel, due to ambient light you couldn't see the arrows lit that well in summer and come winter by around 21:00 the lights had gone out. They have since installed mains lights again.

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 Post subject: Re: Solar diy
PostPosted: Fri Jun 29, 2018 10:54 am 
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Solar. like wind, is for countries that have regular, reliable sources of the energy they require.

Tropical areas? No problem. The UK - you're avin' a 'larf.........

It's all well and good experimenting but you have to experiment for a purpose. We know it can be done, we know it works, we know HOW etc but the result of the experiment should be 'is it worth it'?

If you total the costs involved to get the light you require and compare it to creating the same amount of light using existing methods (domestic electricity) does the DIY route work out cheaper? If not, why bother?

And if you start the old 'because of carbon pollution' etc argument you also need to experiment with your cognitive abilities - to decide whether you're sane and capable of individual thought or 'political' and deluded into believing the cr@p they spout to support the likes of solar/wind projects.

But if it's 'for fun' then...... meh..... throw something together and see what happens!

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 Post subject: Re: Solar diy
PostPosted: Fri Jun 29, 2018 7:06 pm 
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kellys_eye wrote:
But if it's 'for fun' then...... meh..... throw something together and see what happens!


You mean not subsidised.


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 Post subject: Re: Solar diy
PostPosted: Fri Jun 29, 2018 7:13 pm 
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someone-else wrote:
Besides, you can't charge a battery AND run LED lights if the LED lights are the same wattage as the solar panel, not to mention that solar sounds good, but often isn't.


Maybe the OP does not want to run the lights when the sun is shining :scratch:


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 Post subject: Re: Solar diy
PostPosted: Fri Jun 29, 2018 7:31 pm 
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Might do if its for a shed / out building

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 Post subject: Re: Solar diy
PostPosted: Sat Jun 30, 2018 12:00 am 
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It is the regulator that makes the difference. You can use a very cheap regulator, and this is likely the best option with small panels, but it is a balance, if you use a good quality regulator then it first of all adjusts the voltage at the panels to ensure maximum output, it also pulse charges the battery so drawing power from the battery at the same time as charging will not upset the charge sequence it with bang in as much power as it can, without over charging the battery.

However these clever regulators use power, so if using a small panel the regulator can use more than it gains. There have also been advances in panel technology the better panels cost more, but can start and stop producing earlier and latter.

Also where aimed, panels set East and West with of course their own inverter regulators start and finish charging earlier and latter than those facing South, where the aim is to recharge batteries lengthy of time when batteries are charged is important, take a 20 Ah battery as an example, with 70% discharged it will likely fully recharge in 8 hours, does not really matter about size of charger I use a 3.8A charger, and even that small within 1 hour the charge rate has reduced. If however it does not fully recharge then next day the battery is say 69% charged, as each day passes the battery gets more and more discharged, and unless you realise what is happening then the battery will get sulfated and fail, increasing current output of solar panels will not help as battery simply can't absorb the energy.

The cure is likely larger batteries, not bigger solar panels, or panels that charge for longer. In the Falklands they used solar and wind power, solar was better because it produced power for longer.


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 Post subject: Re: Solar diy
PostPosted: Fri Jul 13, 2018 11:51 pm 
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I Will try and explain again. my mom has some store brought solar led lights, and i want to improve upon them by buidling my own but i want to use 5V USB LED Strip lights to water proof to run down the garden. Now i know you can already buy these with a solar panel attached but i think 5v will give a much better amount of light.

what size single solar panel would i need and battery please bear in mind that this is for lighting up the boarders. iv watched you tube videos were that have mentioned using a 5v booster


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