Recommendable system is so simple.
I believe that the system should be satisfied
with the following 3 points.
1. It must be cheap.
2. It must be simple, and
3. It must be sustainable.:see next page.
Regarding point 1, this system includes
following items.
This system consists of the following 3 elements.
The left is cheero Power Plus 2 with 10,400 mAh.
This can charge 2 machines simultaneously.
Regarding point 2, compared to the solid system before., this system excludes a car battery and charge controller. But only Li-ion battery is added instead.
Regarding point 3, in this system, you can charge your Li-on battery. Through
this battery you can charge various devices. Even you can use LED light
at night..
In fact you can connect direct to your devices such as cell phones. However, you are advised to use Li-ion battery to be charged and save electricity
and then you charge your machines from this battery. Li-ion battery can
be allowed to be buffered. In case bigger voltage from a solar panel flows
or backward flow happens, the risk can be minimized by having this battery
in the system.
Attention should be paid to proper wire connection (+ and -) between a
solar panel and a cigar socket. If you have wrong connection, the USB output
will be broken.
To refrain from backward flow, you should install a gadget which usually
comes together with a panel. This was already mentioned in previous pages.
| item |
price(JY) |
specification |
|---|---|---|
| solar pane |
\ 5000 | 20W |
| cigar socket |
\ 170 | This may not be needed unless it is available |
| USB output |
\ 500 | Available to 12V and 24V |
| USB cable |
\ 100-500 | Attention to the shape; a micro plug. |
| Li-on battery |
\ 2000 | more than 10,000 mAh |
Recommendations
It is more recommendable that you can get 2 units of Li-ion batteries. Then you can alternatively use (be charged and charge) them. as the below image
Regarding a capacity of a solar panel, it is advised 20W as far as I have experiensed. It is because the highest voltage from the 20W panel is 20V..
Price list and specification
I found a paper on sustainability while voltage of a battery is low. A
solar panel happens low output due to weather.. In this case, MPPT (Maximum Power Point Tracking) system is needed. A battery below has this
system inside.
Xiaomi Powerbank 10000mAh (\ 2,000 at Amazon Japan)