solar panel

Ectophile

Kiaora_oap said:

Dolor said:

Kiaora_oap said:

Dolor said:

According to some sites a 30 watt LED bulb is equivalent to a 300 watt halogen. Surely this would give you a ‘beam me up Scotty’ pillar of light unless you can find a clever away of scattering the light around the room.

hi
i did want to just run it off the panel, and let the sun decide when it put the light on or off.
the natural rhythm of life on earth ! 
but it appears i need some control on the panel, unless there is a way of controlling the power supply without a battery ?
maybe a circuit with a drain for anything over 12v
i have a 30w led strip light at the moment and its fine
thanks for your input
regards
kiaora

In your original post, you said 'the kitchen is not as light as i would like'. Isn't there a slight flaw in your logic?

We need artificial light when natural light levels are low: when natural light levels are low, then solar panels are of little use unless you have a large array. For example, I have 7kWp of panels on my roof and my daily output this month has varied from 3.6kWhs to 33kWhs with instant power varying from 100 watts to 5kWs. Scale the solar panel size down and you might find that your 30watt LED bulb is as dim as a Toc H lamp when you need it the most.

hi
I think I may be on a sharp leaning curve here.!
if I get this right, I may need 2-3kWp to run a 30w led lamp ?
If I install the panels myself, how would I use the excess power in the house ? if connected to the house wiring, would it drive the electric meter back ?
I've not heard the phrase about the Toc H lamp for a very long time ! nice one.

thanks again for your input
regards
kiaora

No, you don't need 2-3kWp of panels to power a 30W lamp!  People are trying to come up massively with over-complicated solutions here, given what you originally asked for.

If you expect the lamp to dim every time a cloud goes across the sky, and expect it to go off at night, then you could do it with a simple arrangement of one solar panel, a lamp that runs on the voltage the panel puts out, and something to limit the current when it's a really bright day, so you don't blow the lamp.

You need to find an electronics hobbyist who could make up such a system fairly easily.

Kiaora_oap

Ectophile said:

Kiaora_oap said:

Dolor said:

Kiaora_oap said:

Dolor said:

According to some sites a 30 watt LED bulb is equivalent to a 300 watt halogen. Surely this would give you a ‘beam me up Scotty’ pillar of light unless you can find a clever away of scattering the light around the room.

hi
i did want to just run it off the panel, and let the sun decide when it put the light on or off.
the natural rhythm of life on earth ! 
but it appears i need some control on the panel, unless there is a way of controlling the power supply without a battery ?
maybe a circuit with a drain for anything over 12v
i have a 30w led strip light at the moment and its fine
thanks for your input
regards
kiaora

In your original post, you said 'the kitchen is not as light as i would like'. Isn't there a slight flaw in your logic?

We need artificial light when natural light levels are low: when natural light levels are low, then solar panels are of little use unless you have a large array. For example, I have 7kWp of panels on my roof and my daily output this month has varied from 3.6kWhs to 33kWhs with instant power varying from 100 watts to 5kWs. Scale the solar panel size down and you might find that your 30watt LED bulb is as dim as a Toc H lamp when you need it the most.

hi
I think I may be on a sharp leaning curve here.!
if I get this right, I may need 2-3kWp to run a 30w led lamp ?
If I install the panels myself, how would I use the excess power in the house ? if connected to the house wiring, would it drive the electric meter back ?
I've not heard the phrase about the Toc H lamp for a very long time ! nice one.

thanks again for your input
regards
kiaora

No, you don't need 2-3kWp of panels to power a 30W lamp!  People are trying to come up massively with over-complicated solutions here, given what you originally asked for.

If you expect the lamp to dim every time a cloud goes across the sky, and expect it to go off at night, then you could do it with a simple arrangement of one solar panel, a lamp that runs on the voltage the panel puts out, and something to limit the current when it's a really bright day, so you don't blow the lamp.

You need to find an electronics hobbyist who could make up such a system fairly easily.

hi
thanks for input,
 i did wonder if i just get a 80/100w solar panel?, and try it with two lamps?
i could probably jig it round to switch on lamp 2 with a thyristor if current too high for lamp 1   ?
thanks again for input, i was getting decidedly dejected that my plan was doomed from the start !
it would be nice for the lamp to mimic the sun/daylight . a sort of electric sun tunnel !
regards
kiaora