Author Topic: Question po about solar panels (Read 479 times)

kenshee · « **on:** February 06, 2011, 03:18:05 PM »

Tanong po sana ako on how to attach solar panels.
I recently bought Solar Panels from E-Gizmo which were 5V 1W.

I am making a solar tracker po for a project.
With LDRs, PIC, and Servo. I think the total load current would run for about 1A+.
So im thinking of this connection po.

Tanong po sana ako kung pano po i sisingit ung battery charger? And kung what type of battery po ang gagamitin.

Ur reply is very much appreciated.

Maraming salamat ho.

Philippine Electronics Forum · « **on:** February 06, 2011, 03:18:05 PM »

rdpzycho · « **Reply #1 on:** February 06, 2011, 03:28:47 PM »

avoid using 7805 as a regulator, masyadong aksaya 'yan sa efficiency. batteries should be connected right after the panel (with battery charger), tapos sa battery kukuha ng load. kung 10V lang, pwede na 'yung bank ng 6V SLA as they will be the cheapest.

BTW, solar tracking normally doesn't have any feedback dahil fixed ang cycle ng araw based sa kalendaryo kaya typically isang ikot lang from sunrise to sunset tapos balik lang sa reset position.

taken from Wikipedia on Heliostat:

"Most modern heliostats are controlled by computers. The computer is given the latitude and longitude of the heliostat's position on the earth and the time and date. From these, using astronomical theory, it calculates the direction of the sun as seen from the mirror, e.g. its compass bearing and angle of elevation. Then, given the direction of the target, the computer calculates the direction of the required angle-bisector, and sends control signals to motors, often stepper motors, so they turn the mirror to the correct alignment. This sequence of operations is repeated frequently to keep the mirror properly oriented."

Philippine Electronics Forum · « **Reply #1 on:** February 06, 2011, 03:28:47 PM »

kenshee · « **Reply #2 on:** February 06, 2011, 06:50:55 PM »

Thank you po sir. Maraming salamat po sa added info. You're the best.

Bale paano ko po ma i-regulate ung voltage ng main circuit pag di ako mag 7805?

Philippine Electronics Forum · « **Reply #2 on:** February 06, 2011, 06:50:55 PM »

rdpzycho · « **Reply #3 on:** February 06, 2011, 08:07:35 PM »

search for Roman Black simple SMPS. pwede siyang gawing kasing liit ng 7805.

Philippine Electronics Forum · « **Reply #3 on:** February 06, 2011, 08:07:35 PM »

kenshee · « **Reply #4 on:** February 15, 2011, 10:27:14 AM »

Sir, I tried to connect my circuit like this.

Tama pu ba?

Bale, the Cellphone battery will act as the source na mag susuply sa main circuit. tapos ung solar panels po eh mag
chacharge sa battery.

But im kinda not having expected results. Paki correct po. Please and thank you..

As i placed a tester. Unti unting nauubos ung voltage ng battery.

Philippine Electronics Forum · « **Reply #4 on:** February 15, 2011, 10:27:14 AM »

enriz622 · « **Reply #5 on:** February 15, 2011, 11:09:31 AM »

patambay nga po

kenshee · « **Reply #6 on:** February 15, 2011, 12:29:39 PM »

Update lang po. Ok na po pla xa!

Kaka test lang ulit namen. Inalis ko lang ung diode, i guess the 0.7V drop did an effect.

Bale pag me sunlight. The solar panels will charge the battery which will power the source (the tested voltage was around 8.4V and stable(due to
the charging effect ng panels) ).
Pag alang sunlight, the battery alone will be the one acting as the supply, around 8.2V and gradually decreasing. Pag me sunlight ulet, unti unti nanamang aakyat ung voltage.

I love it. This finishes our Solar Tracker project.

Please reply po if i should be corrected. Thanks

Macgyver · « **Reply #7 on:** February 15, 2011, 01:28:57 PM »

na try ko na din yan ganyan setup. solar to cellphone battery although 1 battery lang. ok naman. may nakita din ako sa net, ganyan din ginawa.

kenshee · « **Reply #8 on:** February 15, 2011, 03:33:28 PM »

ok lamat po sa confirmation.

bravokilo · « **Reply #9 on:** February 16, 2011, 04:26:19 AM »

Hi sisters. You can google solar panel regulator. usually, the regulator does not shut down but diverts the current to somewhere else. In this manner, walang loss during low periods. Yung maga emergency tower lamps uses the same concept. kapag full charge na ang SLA, a tansistor "shorts"the line to reduce the current.

By the way lithium based batteries get easily destroyed with overvoltage/overcharging. they do not like trickle charging either. Better to use nickel based like nicads and Ni mH.

If you really want to use li ion, study the universal charger where the batt is clipped and an LED starts blinking.may cut off out yun pag full charge na. See if a 5V input is adequate.Alisin yung built in switching PS dun from 220v.

nagpost din ako ng Li ion charger schem noon. you can search here or google na lang.

BK

kenshee · « **Reply #10 on:** February 16, 2011, 06:27:28 PM »

^ opo super good idea po! dami niu po nalalaman.

salamat master BK

bravokilo · « **Reply #11 on:** February 19, 2011, 09:10:37 AM »

kenshee, an SLA is cheaper. P180 yung 4AH sa ELFOH Raon, udn malapit na sa Ongping.

Betterer and Cheaperer!

BK

Philippine Electronics Forum · « **Reply #11 on:** February 19, 2011, 09:10:37 AM »

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