In
this article, the solar light I mean The INTEGRATED design solar street light,
solar garden light and solar wall light…..
Most of the people want the solar light keep in full light
for whole night and no need sensor. But most of the integrated design solar
lights in the market are with sensor and turn to full light only when people
pass by. And now I would like to explain why the factories do this design.
Firstly, as all of you may know the solar light fixture consist
of solar panel, LED Chip, battery and controller……Power of the solar panel,
Output of the LED and capacity of the battery need to match well so that the
fixture can work in properly. If one of them doesn’t match, then the light
fixture will have problem or cannot work well as expected. For example, if we
only increase the LED output while keeps the solar panel and battery capacity
the same. Then the battery will consume very fast and the light fixture will
turn off early at night. Because the (keep same) battery capacity is too low to
support such increasing LED output.
Some of you may ask to increase the battery so that it can
support the increasing LED output. But if we increase the battery capacity
while keep solar panel the same, then the battery cannot fully charged because
the solar panel is still small.
Ok, if we increase both the solar panel and the battery, then
the lamp size will enlarge. Enlarged lamp case means increased labor cost,
material cost and shipping cost. You may realize that solar light is always
very big but very low lumen compare to traditional light. The big size is
because the solar panel needs big space. The solar light fixture can be much
smaller and cost reduced a lot if the solar panel can be smaller. That is the
conflict.
That is why the Power of the solar panel, Output of the LED
and capacity of the battery need to match. You can image how big the solar
light is if we make it full light for whole night.
Somebody may ask why not use higher efficiency solar panel so
that it can be smaller size and the charge battery fast. Most solar light in
market is with Poly-crystalline but not Mono-crystalline. That is because the
efficiency between them is not a great different, but the cost is a great different.
That is also because of the cost. Poly-crystalline is more cost-effective. Cost
increase not balance with efficiency if we use Mono-crystalline.
However, the energy saving and cost saving design light
fixture with sensor is humanized. It can meet the requirement for lighting
purpose by turn to full light when people come close but back to DIM light for
save energy after people go away.
However, solar light for high way always need full light and cannot
be sensor-design. That is why solar street light for high way always design
with separated solar panel. The separated solar panel size enlarge not lead to
lamp case size enlarge. I know some factories also make INTEGRATED design and
without motion sensor, but the light seems very big and cost are much higher.
Consider the cost and application requirement of the solar light,
I think INTEGRATED design with sensor is the best design under the current technology.
But I believe the technology is keep make progress. To make the solar light can
be brighter, smaller, and cheaper.
loveandsolar