ZERO DROP SOLAR CHARGE CONTROLLER
These chargers are called ‘zero drop solar charger’ as they do not have any diode drop of 0.7v.
This is a MOSFET based design which has very negligible voltage drop of 0.05v or less which means the loss is very less, ideal for solar applications.
Since the drop is less, the losses are negligible so the efficiency achieved is > 99.5%
In this the tw0 n channel MOSFETs are connected in such a way that their sources become common and the drains will be connected to the negatives of battery and solar panel respectively and the gate will be triggered by the microcontroller.
The positives of solar panel and battery will be joined directly and the circuit was powered from that joint.
When the solar power was present the circuit gets activated and microcontroller will pumps the signals that to trigger the gate of MOSFET, when the gate was triggered the negative voltage will flow through the MOSFET and then the battery will be charged through solar panel.
If the battery voltage reaches 13.8 the pumping signals will be stopped, the microcontroller will check the battery voltage for every 2sec and generate the signals in order to maintain float charging.
WORKING OF ZDSCC WITH AUTO MAINS CUTOFF:
When the solar power is present microcontroller will sense the solar power and it will send a triggering pulse to trigger relay.
The relay movable contact wire is connected to the ac mains phase wire and normally closed is connected to the ac mains phase wire towards inverter.
So, when the solar power was not present the relay is in off state so that the ac mains will enter to the inverter card and it will charge the battery.
When the solar power was present the relay will be triggered by the microcontroller and the phase wire will be cutoff. So, the battery will be charged only through solar panel and appliance will run on inverter mode.
The microcontroller uses was MEGA8-9. The inputs to the microcontroller is battery voltage as first input and voltage as second input.
The led indications is for:
A flashing led to indicate battery charging through solar.
A led to indicate battery full.
A led to show mains cutoff.
In this
circuit you can see that 2 presets extra that presets is used to adjust the
cutoff values of full battery cutoff and presences of solar power cutoff
But in
previous vershion it is required to change the code to adjust the cutoff values
and adjust the 12v series and 24v series ,but now with this modified vershion
we can done this by changing some resistors and adjusting the presets
If you
adjust the pin 27 preset you can adjust the full battery cutoff ,the voltage at
the pin 27 is called reference voltage .
The full
battery cutoff is depend on the reference voltage value
If the
reference voltage value of pin 27 is 4.7 then the full battery cutoff value
occurs at 14v
Similarly the pin 26 preset will adjust the solar
presences cutoff value ,if you want the mains changeover when the solar panel
voltage is greater than the 12.5 then the reference voltage at pin 26 is 3.1v
(for any
more cutoff values which you preffered for 12v ,24v and 48v series please mail
me so that I will calculate and give the reference voltage for your specified
cutoff value)
The
resistors R4 & R9 =20k for 12v series,40k for 24v series ,80k for 48v
series
The
resistors R3,R5,R8 and R10 =10k for 12v ,20k for 24v and 30k for 48v series
APPLICATIONS
- SOLAR INVERTERS
- SOLAR CHARGE CONTROLLERS
- SOLAR CLF INVERTER
- SOLAR STRETH LIGHTS
same product can be used for the solar dc power unit like led lights and a dc fan with cell phone charger it can be run with solar power at day time and can be run with 230v ac main at night times
intrested can mail me at sandysplash230@gmail.com
hello sir, circuits is really fine i like it more, i was trying to build the same has u have posted, but, i could find source code to program the AT89 IC
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Deletedear sir,
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hie check your mail
Deletesource code please??? dixxx@rocketmail.com
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