This holds the solar panel voltage constant, but the current into the battery rises and falls throughout the day charging the battery, always using as much current as becomes available from the sun.
That takes care of the solar panel.
The next thing to think about is the battery.
Putting maximum solar charge current into the battery all the time is good, until the battery is fully charged. You then need to start thinking about holding the battery voltage at some safe maximum by over riding the control of the solar buck converter.
Well yes, the initial problem is trying to get as much power from the solar panels in all seasons, and in highly changing weather conditions.thank you,
But would the concept of keeping voltage constant and increasing or decreasing the current flowing in the battery remain same irrespective of the kind of battery(i.e wet or sealed)?
Usually solar systems struggle, especially in winter.Because the charger developed for wet batteries are not supposed to charge sealed batteries as they may damage the battery.And i suppose the charging cycle you mentioned is to charge a sealed battery.
You have mentioned that the solar panel voltage is constant.What is needed is a buck regulator that regulates its INPUT voltage.
If the solar panel voltage tries to rise, the duty cycle increases feeding more current into the battery. If a cloud passes in front of the sun, solar voltage will try to fall, but the buck regulator reduces its duty cycle, reducing the load on the solar panel, always holding the panel voltage at the optimum point for maximum output power. Power will obviously decrease with a cloud, but it will always be at the maximum that the panel can produce at the time.
This holds the solar panel voltage constant, but the current into the battery rises and falls throughout the day charging the battery, always using as much current as becomes available from the sun.
the bold line i didn't get what are you trying to tell me please can you explain it.You want to draw power from a PV panel at the maximum Ampere level it can put out, continuously (spec is 5.79 A). That is efficient use of the panel, and fastest way to charge. A 150 A-Hr battery can easily absorb 5.79 A as the bulk charge rate.
Therefore your charge controller input should be able to draw maximum continuous Amperes from the panel.Internally it may have a different waveform. That does not need to be at a constant level, but can be triangular which is typical in a buck converter.
I understand this if the available voltage is maximum then i can always make the panel voltage come back to max power voltage(As voc>vmpp at that irradiance).The solar panel will produce a current which varies from zero (at night) to a maximum short circuit current in bright direct sunlight.
What is needed is a buck regulator that regulates its INPUT voltage.
If the solar panel voltage tries to rise, the duty cycle increases feeding more current into the battery.
But then what would be at night? (I guess the PWM duty cycle will be 1)If a cloud passes in front of the sun, solar voltage will try to fall, but the buck regulator reduces its duty cycle, reducing the load on the solar panel, always holding the panel voltage at the optimum point for maximum output power.
Ok now say my solar panel can give a max power at 30V and the controller is just making sure that panel operates at max power voltage but,simultaneously when i am doing this i should also check that the voltage of battery is maintained at around 13-14.4V for a 12V battery right?The next thing to think about is the battery.
Putting maximum solar charge current into the battery all the time is good, until the battery is fully charged. You then need to start thinking about holding the battery voltage at some safe maximum by over riding the control of the solar buck converter.
No, that never happens.Warpspeed, if you have two different systems trying to charge the battery wouldn't they fight each other and tend to oscillate.
But then what would be at night?
Ok now say my solar panel can give a max power at 30V and the controller is just making sure that panel operates at max power voltage but,simultaneously when i am doing this i should also check that the voltage of battery is maintained at around 13-14.4V for a 12V battery right?
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