I was going through the previous post I made when I discovered
that something was missing which could be confusing. From that post and video we say
that using a TV set, a DVD player and a fan will enable us have 5.2 hours of
use on a battery of 12V and 200AH at full charge.
Someone can easily miss understand this and say it doesn’t
worth it.
Now to make things clear, I want to say that the calculation
was obtainable only when we don’t charge the battery as we use, if we charge the
battery and use at the same time we will have a different result and that is
what we are about to see now.
I live in the part of Africa where sun rays hit the
earth as early as 8 am and shines till 5 pm on a good day, which is roughly
about 8 hours of insolation time or charge time
“Solar Insolation is the amount of electromagnetic energy (solar radiation) incident on the surface of the earth. Basically that means how much sunlight is shining down on us”
If you have a good system that charges your battery
to 100% on daily basics.
Then you will have more than 5.2 hours to use your
gadgets (TV, DVD player and fan) in a day (24 hours)
Let’s see a typical example from the previous post video TV,
DVD player and fan consumes 226W.
I don’t want to go deep here and technical here, so I
will keep it simple. I won't consider losses or anything
To charge a 12V 200AH (2400WH) battery and use
226W of power at the same time you need solar panel capable of producing more
than what you are using (226W), solar panel capable of producing 300W and above
is what you need, say solar panel producing 400W for example.
The amount of power generated by the solar panel
must be more than the power you are taking away from the solar system.
Solar Panel input
|
Battery
|
Total Power used
|
400W
|
12V 200AH
|
226W
|
Here is the question again.
How long can you use the above system in every 24
hours with the same gadgets (TV, DVD player and fan)
Let’s say you start using your solar system by 8am
400W - 226W = 174W
Explanation
So if we have 400W coming in from the solar panel
and you use 226W, you will have 174W left which will go into the battery and be stored there.
So you can use the system from 8am while it is being
charged and at 4pm you might have done 8 hours of use, then if the battery
stops charging by 4pm, it’s assumed that you should have 100% charged battery
by 4pm. From my previous post and video and calculation, we had 5.2 hours of use at 50%
discharge when the battery is not charging
So we add this 5.2 hours used (when not charging) to
our 8 hours use (during the day use, and charging). This bring us to about 13
hours of daily use on our gadgets (TV, DVD player and fan).
So we can do 8 am to 9 pm daily, same as 13 hours of
free energy.
So when I said you can use your gadget for 5.2 hours
in the previous video, I meant using a fully charged 12V 200AH battery without
charging as you use
Summary
What we can deduce from here is that,
1. Your gadget (TV, DVD player and fan) draws
226W every hour, so in 13 hours it would have used total of 2,938W
2. 400W solar panel produces 400W every
hour so in 13 hours you might have produced something less than 5,200W, Which is
more than the total power used (2,938)
Hope this helps
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