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Author Topic: day\night "switch" and panel size needed?  (Read 500 times)

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Offline Alan

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day\night "switch" and panel size needed?
« on: March 12, 2018, 02:14:59 pm »
Hi guys,

I have a couple of these small fairylight sets outside on a patio roof which work well until the cheap rechargeable battery starts to fade, then I replace with a new rechargeable and they work again for the next 6 to 9 months etc.. Problem tho is the panels eventually "craze" over the plastic cover and they don't get sufficient sunshine etc.. They are cheap to replace every other year, but I also have a couple of LED downlights on gutters etc, and I'd like to incorporate them all onto one power supply.

So, I intend to use a small 7.2 Ah 12 Batt, with something like a cigarette USB charger to downsize the voltage to 5 volts, which I could connect 3 or 4 sets of lights onto  (@ 1.2 volts per chain of lights.)

I want to put one small Panel on the roof to help keep this batt charged? Would a small 10 Watt glass panel work ok? And would I need a charge controller for such a small setup? Do you even get 12 volt panels?
And the second question, these small kits have some built in circuit to automatically switch the lights on at night and off in the day?  How could I go about this?

thanks guys

Alan
 

Offline Alan

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Re: day\night "switch" and panel size needed?
« Reply #1 on: March 13, 2018, 11:36:33 am »
@alanB , Can you comment on this? How big a panel etc, and what would be the simplest method to switch off an on automatically?  :thumleft:
 

Offline Casting from Turd

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Re: day\night "switch" and panel size needed?
« Reply #2 on: March 13, 2018, 12:16:52 pm »
At R100 bucks a pop from Makro and 70 bucks from the cjinaman.......  Moer weg and koep n nuwe een
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Offline Alan

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Re: day\night "switch" and panel size needed?
« Reply #3 on: March 13, 2018, 01:04:57 pm »
I'm kind of at the level know, but, you know, it's just a mission to continually strip it all out, throw away and replace.

But ok.
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Offline alanB

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Re: day\night "switch" and panel size needed?
« Reply #4 on: March 14, 2018, 04:33:37 pm »
@alanB , Can you comment on this? How big a panel etc, and what would be the simplest method to switch off an on automatically?  :thumleft:

Hi

You can use this calculator to work out what sized panel etc you need, all you need is the total Watt-hours required per 24 hrs.
http://offgriddiy.co.za/calculators/small-solar-system-calculator/

 I suppose you could switch the lights on/off via one of those light sensitive switch thingys, not sure if that would work for lower voltage systems but they might?
« Last Edit: March 14, 2018, 04:35:19 pm by alanB »
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