# newbie help

Hi im new to everything and i need some help. So i got this 6v 1.5watt solar panel and i want to do something with it. I've googled so much, but i didn't find all that much. So i'm just wondering what i could do with it. I am thinking about making a solar light or something, but i don't know what kind of battery it could charge and how long the lights would be on for and so on.

Any help will be appreciated.
Thanks

• Solar Expert Posts: 10,300 ✭✭✭✭
Re: newbie help

most would go with a nimh or nicad battery charger, but today's batteries are picky of the charging circuit.
• Solar Expert Posts: 705 ✭✭
Re: newbie help

Have a web search for educational solar kits or something similar, there are numerous people selling such kits (IN UK at least) and most use a similar small solar panel have a look at whats available and make your choice. I would thinks that a model shop would carry most parts to finish any project yoy decide to try.
Re: newbie help

hi the problem with googling is that all the sites show like 2v 200ma solar panel and mine says 6v 1.5 panel, i don't know if theres a conversion from watts to amps or anything.
• Solar Expert Posts: 10,300 ✭✭✭✭
Re: newbie help

basic electronic formula for power is:
power(watts)=voltsxamps
with that if you know any 2 of the elements in the formula that the other could be found. 200ma is .2amps btw. for your little panel it is 1.5w/6v=.25amps or 250ma. does that help you?
Re: newbie help

So what kind of battery would that charge, an AA battery is like 500ma, and when i figure out what battery i could charge, how do i figure out what i can power with it. Lets say i want to power some led's with it, theres some 5mm 3.2-3.4V @ 20mA white leds. Could i run (250/20 = 12.5) 12 of them for like 8 hours at night?
• Solar Expert Posts: 10,300 ✭✭✭✭
Re: newbie help

i have 2500ma aa nimh batteries, but most chargers can spread out the charge over time. very basic ones take up to 16hrs and that is like a 175ma charge being delivered over 14hrs and the rest is basically charging losses. some fast charge and your pv couldn't do that for a battery like mine, but smaller types like a 500ma battery with a good charging circuit, it could. in most cases it must have a regulator or you will eventually fry your batteries. i can't and won't get into giving you an online ee course as that is up to you and you can also figure out what it is you'd like to do with the pv in time. i do feel the designing of a charger may be beyond you, but if i'm wrong let us see the circuit you come up with for this. maybe a good pwm?
Re: newbie help

I guess i just thought it would be something easy. Like buying some batteries and an led light. I guess ill find another way to do it. I will just go to a science and surplus store and have them explain things to me and get me what i need.
• Solar Expert Posts: 8,500 ✭✭✭✭✭
Re: newbie help
eekers wrote: »
I guess i just thought it would be something easy. Like buying some batteries and an led light. I guess ill find another way to do it. I will just go to a science and surplus store and have them explain things to me and get me what i need.

Easy is such a relative term. When putting pieces of things together, that are not part of a kit, you need to have an understanding of what you are doing.
It's like I got 2 motorcycle tires and 2 truck tires off e-bay, and I have an old VW chassis in the field out back, will the headlights work ?
You need to match your batterys CHARGING voltage, to the panel voltage, and then resistors for the LED. A 6V battery charges at 8V, someetimes. Subtle things like that.
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