# semsem3030

2CommentsJoined September 11th, 2016

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• Dear Deba:First of all, i want to ask you some important questions, your answer will be so important to remove the some confusions.....Question 1: I Make small test...I have 12V Lead-Acid battery i measured the voltage which was 12.3v....then i applied charger of voltage 13.45v on the battery terminals for 1 second....then i remove charger terminals.....I measured the voltage on battery terminals immediately the result was 13.3V and decreasing then after around 3-4 minutes the voltage of battery became stable at 12.4V......repeat this test for 6V battery and the time was 1.5 to 2 minutes .....so i think that this was the relaxation time for battery.......The question is how could measure the battery voltage during charging although the battery needs relaxation time to measure the ac...

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Dear Deba:First of all, i want to ask you some important questions, your answer will be so important to remove the some confusions.....Question 1: I Make small test...I have 12V Lead-Acid battery i measured the voltage which was 12.3v....then i applied charger of voltage 13.45v on the battery terminals for 1 second....then i remove charger terminals.....I measured the voltage on battery terminals immediately the result was 13.3V and decreasing then after around 3-4 minutes the voltage of battery became stable at 12.4V......repeat this test for 6V battery and the time was 1.5 to 2 minutes .....so i think that this was the relaxation time for battery.......The question is how could measure the battery voltage during charging although the battery needs relaxation time to measure the accurate voltage ??? if you measure the voltage after short time or during toff this will gives you wrong readings.Question 2:In bulk charging, to provide constant charging current, you need to increase the charger voltage gradually.....but if you applied constant voltage, the current will not kept constantthanks

• Dear Deba168:thanks a lot for this good work.........but still have some confusion about one thing ...concerning the circuit schematics...relating to measuring the voltages of solar charger and battery...The time that MOSFET is ON,the voltage will be nearly the same on charger and Battery even if you start to charge the battery from low voltage level...so how could you measure the battery voltage while MOSFET is ON???I was thinking about that issue alot..and i thought that you might measure the voltage of battery in zero period of the input PWM signal but is this time enough to make battery return to its actual voltage level...???thanks