Very simple Solar System

冰之風

1) I want to use a solar cell as charger for a small recharger battery.
2) When it is switches on, the motor will be functioning.

The following is a preliminary idea.  Is it workable?  I only need a very simple but workable circuit only.  Thx!

jackli

唔太work...

果個diode 會食左0.5V- 0.7V...
仲有,,,  5V 80mA 的太陽能板隻都已經講緊hkd 100

Offer

原帖由 冰之風 於 2009-9-27 14:42 發表
1) I want to use a solar cell as charger for a small recharger battery.
2) When it is switches on, the motor will be functioning.

The following is a preliminary idea.  Is it workable?  I only need a  ...

要义5V光伏板電壓要高過電池先义得入

冰之風

Thx to jackli and Offer's comment.  Could I conclude that the circuit basically workable if I reduce the rechargeable battery and motor to, say 3.6V?

jackli

假設你用5V 150mA的太陽能電板,
電流經過diode, 電壓已得返4.5V ( 睇下你個太陽能電板出到幾多A, 出得愈多A, 降得愈多V)

所以你個電池唔可以大過4.5V
假設你個電係4.2V (3AA) 2000mAh,
用5V 150mA的太陽能電板叉電,
就要叉2000/150 = 13個鐘喇

所以做demo, 不如叉好哂D電, 就咁推個裝置算,講佢地講: "喇, 依個叉電我係屋企用太陽能叉好喇"
加埋手口講解, 無謂買咁多野

prowede

原帖由 冰之風 於 2009-9-27 19:27 發表
Thx to jackli and Offer's comment.  Could I conclude that the circuit basically workable if I reduce the rechargeable battery and motor to, say 3.6V?

Solar cell > battery >= motor (depends on the voltage and current needed)

冰之風

原帖由 jackli 於 2009-9-27 20:33 發表
假設你用5V 150mA的太陽能電板,
電流經過diode, 電壓已得返4.5V ( 睇下你個太陽能電板出到幾多A, 出得愈多A, 降得愈多V)

所以你個電池唔可以大過4.5V
假設你個電係4.2V (3AA) 2000mAh,
用5V 150mA的 ...

Thank you very much for your kind suggestion.  That is what I try to do.
However, the solar cell must be presented, so, I will let the solar cell there as demo only.  Of course, the circuit must be workable at first.
Once again, thank you very much for your kind attention.

Offer

原帖由 冰之風 於 2009-9-27 22:00 發表

Thank you very much for your kind suggestion.  That is what I try to do.
However, the solar cell must be presented, so, I will let the solar cell there as demo only.  Of course, the circuit mu ...

Any result?