The battery voltage changes as it charges. If you use a constant voltage charger then a series resistor will give a charging current which tails off as the battery approaches full charge; i.e. it is not a constant current. Do you mean a 200mA current limit?
Hi,
as the situation has became still now, I'm not at the position to decide anything yet. I want to do the best possible act as far as my capability....
Hi,
as the situation has became still now, I'm not at the position to decide anything yet. I want to do the best possible act as far as my capability....
As Eric pointed out, the panel is rated to put out a max current of ~360mA at 8.3V.
It will put out slightly more current (~400mA) if connected directly to the battery with no intervening regulator.
This Sealed lead acid battery will take a max charge rate of 1.35A, so no current limiter is needed; the panel cannot exceed the max allowed charge rate.
It can, however, exceed the maximum allowed charging voltage of 7.2V, so a voltage regulator is required. You also must switch the regulator output voltage from 7.2V to 6.8V after the charging current drops to a low level per the previous forum thread.
Hi MikeML .... I think this picture can have more details about the battery I want to use.......
This Sealed lead acid battery will take a max charge rate of 1.35A, so no current limiter is needed; the panel cannot exceed the max allowed charge rate.
As I said: "This Sealed lead acid battery will take a max charge rate of 1.35A, so no current limiter is needed; the panel cannot exceed the max allowed charge rate."
You could also just build a voltage regulator that is preset to 7.2V. In that case you will have to monitor the current flowing into the battery using a dedicated meter. Watch the charging current. When it drops to <20mA, disconnect the battery from the charger (a lot of work). If you screw up and leave the charger connected too long, you will be degrading the battery by overcharging it.
Or just set the voltage regulator to 6.8V. This will still charge the battery to ~90% of full charge, but it will take five to ten times as long as it would have taken if the charge voltage was set to 7.2V.
I don't know where the 200mA limit came from. The battery that the OP linked to will tolerate a charge rate of 1.35A (It is printed right on the battery).