Here is a dual charger for Inverter battery. It can charge the battery via Solar panel as well as from AC power to keep the battery always in top condition. Even though a 12 volt Solar panel gives around 20 volts in full sunlight, it is available only three or four hours in a day. During the remaining hours, the intensity of light is very low and the condition worsens in cloudy and rainy days. This results in incomplete battery charging that ultimately leads to memory effect and permanent damage of the battery. This charger shifts the charging to AC mode when the voltage from solar panel reduces below 12 volts and restores the solar charging when the sunlight is sufficient enough again.
The circuit uses a voltage comparator built around IC1. It is powered by the voltage from the solar panel and ZD1 provides 12 volts regulated supply to the circuit. Its Inverting input is referenced at 10 volts using a 10 volt Zener while the Non inverting input receives a variable voltage through R3, VR1 and R4. When the solar panel gives more than 12 volts output, pin3 of IC1 gets a higher voltage than pin2 ( as set by VR1) and its output turns high. T1 conducts and the relay energizes. The battery gets charging voltage through the Common and NO contacts.
Click Image to get enlarged view
When the solar panel output reduces to 12 volts, output of IC1 turns low and the relay de-energizes. Then the battery charges through the Common and NC contacts of the relay. The NC contact is connected to the Transformer power supply using a 15-0-15 volt 1 Ampere transformer .If the switch S1 is closed, the AC charging continues during night also.
SIR…………..,
THANK YOU FOR YOUR VALUABLE REPLY………………. :))
Actually in present situation every body using
Inverter- Battery – Charging circuit mainly depends on normal available 230V A.C. Supply only. The battery terminal is permanently connected with Inverter terminal. So if you are change the circuit in such a manner , the battery can accept both way of charging simultaneously
( Normal A.C.Supply as well as solar charging source ). then it is very useful one………………
I have mentioned some points here for the kind perusal please.
(1). But depends on availability of any one charging source, another source (either normal AC Supply or Solar ) disconnect automatically it self from the circuit.
or
(2). Both the source is simultaneously used for battery charging without any problem.
( Battery charging time is reduced so much…..)
(3). We must avoid manual disconnect Battery from the normal inverter charging circuit and reconnect it to Solar charging circuit.
I expect a good reply sir…………….
SIR……………….. !!!
Thank you so much…..
I have already have 800VA sukam inverter with 160 AHr. AMCO made Battery. I need a solar charger circuit wanted in parallel with the normal 230V AC supply charger. Can you help me………….. ?
If so THANKS in Advance tooooooooooooo
R A M ” S
Hello Ramachandran
I think the circuit above will satisfy your requirement. It delivers around 1 amps current from the transformer. Battery capacity and charging current has no relation. If it is 12 volt battery, use a 15-0-15 or 0-15 volt transformer 2 or 3 ampere rating. The battery will take around 1-2 amperes(If it is good) initially then it drops to 500 mA or less during the remaining period. Since the inverter battery is always connected to charger slow charging with low current is ideal.
sir. If I WANT TO CHARGE 150 AH BATTERY WHAT SHOULD BE THE STEPDOWN TRANSFORMER
CHANDRASEKAR
Dear Chandrasekhar
See the reply above. It is applicable to your query
Dear Sir, Thank you very much for very useful circuit especially for the current situation in tamilnadu(India). I am planning to use 300 or 400 watt solar panel to charge my existing 12V 150Ah battery (850VA Microtek Inverter). I have some basic questions & clarifications…Kindly advice.
1. I need to use atleast 30A solar charge controller to charge my battery..can i just connect the output of charge controller directly to replace the solar panel. I have concern about higher current flow.
2. What happens when power fails during day time (whenthe solar output is 12 or 12+ volts)..the relay energizes and battery is connected with NO..Inverter needs battery to discharge or to invert DC to AC. Battery + terminal is engaged with solar panel side. Am i right? This may be very basic or annoying question. Sorry for that! Kindly advice.
Dear Prabhu
To charge a 12 volt 150 AH battery you need not require a high current solar panel. A 10 W panel gives around 1 Ampere current in full sunlight. I think 10 or 20 watt is sufficient for a 12 volt battery. Battery capacity and charging current has no relation. Ah means Ampere hour. That is ,150 Ah means, that battery can give 150 amperes in one hour for the load. Usually in inverters 2 or 3 ampere transformer is used. Initially the battery takes around 1-2 amperes but with in a few minutes it will drop to 500 ma or less. Since the charger is always connected to battery , slow charging with low current is used.
Solar charger controller is used for
1. Voltage regulation
2.Current regulation
3. Voltage doubling when the output from the panel drops below 10v or less. In normal connection, the wires from panel enters into the controller and from the controller out, current passes into the battery.
Regarding to your queries.
1. The circuit given should be connected as shown. Check the output from the controller. If it is below 20 volts in full light, it can be connected in the points for solar panel. But the thing is, if the charger controller has a voltage doubler , there is no need for this circuit because even if the solar panel gives 8 volts, there will be 16 volts from the controller. So check the output of the controller during the mid noon hours and evening or morning. If it is always giving 14-15 volts, doubler circuit is there and no need for AC charging.
2. When power fails, the battery charges only from solar panel and no alternative choice. Your doubt is genuine. As per the diagram, it is directly connected to battery without connecting the inverter as load. That is , for battery charging only. Do not use the power from the inverter charger with this circuit since the inverter has its own mechanisms. This is for a free battery or spare battery or charging by disconnecting the inverter from the battery.
see there links
https://dmohankumar.wordpress.com/2011/08/15/pwm-inverter-2/#more-4801
https://dmohankumar.wordpress.com/2011/08/03/4653/#more-4653
https://dmohankumar.wordpress.com/2010/05/30/inverter-selection/#more-777
https://dmohankumar.wordpress.com/2010/04/25/home-inverter/#more-324
https://dmohankumar.wordpress.com/2010/04/20/solar-inverter-battery-charger/#more-283
https://dmohankumar.wordpress.com/2012/10/26/boost-charger-utility-gadget-8/#more-
https://dmohankumar.wordpress.com/2012/10/07/battery-status-indicator-design-trick-16/#more-8977
https://dmohankumar.wordpress.com/2012/09/26/high-current-battery-charger-design-trick-10/#more-8901
https://dmohankumar.wordpress.com/2012/08/28/how-to-maintain-maintenance-free-battery-tech-focus-5/#more-8281
https://dmohankumar.wordpress.com/2012/08/18/what-causes-premature-battery-breakdown-fact-file-32/#more-8154
https://dmohankumar.wordpress.com/2012/08/17/why-water-topping-is-essential-in-car-battery-fact-file-31/#more-8149
https://dmohankumar.wordpress.com/2012/08/12/how-to-calculate-domestic-power-consumption-fact-file-24/#more-8088
https://dmohankumar.wordpress.com/2011/12/28/battery-level-meter/#more-6051
https://dmohankumar.wordpress.com/2011/11/18/power-factor-correction-2/#more-5626
https://dmohankumar.wordpress.com/2011/05/23/battery-requires-care/#more-4147
Dear Sir, Thank you very much for the answer. My understanding was 12V/150AH =1800watts which needs 300watt panel to charge in 6 hours. However, your answer was very useful to move forward.
Can you provide us the circuit which can switch battery to inverter mode when power fails (from both charging modes)…Thanks!
1 Pingback
Comments are closed.
Total visitors since April 2010
Hobby Kits on Facebook
Recent Updates
Top Post of the Day
Social Media
Search
Enter e-Library
Hobby Circuits
This slideshow requires JavaScript.
Projects Online
Get a Circuit
Ask something. We will Answer
Learn, Write Impress
Design a circuit, It is interesting
Today’s Top Hits
CSIR – UGC NET EXAM PAPER 1 PAGE
BSc Zoology Notes
GET CIRCUITS
ENGINEERING MINI PROJECTS CLICK BELOW
COPYRIGHT NOTICE
© D.Mohankumar – dmohankumar.wordpress.com. 2021
Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to D.Mohankumar and dmohankumar.wordpress. com with appropriate and specific direction to the original content.
COMMENTS FROM VISITORS
MY COMMUNITY
Upcoming Events
No upcoming events
Link to Pages
Mohan on Twitter
Tweets by dmohankumar3Follow me on Twitter
My TweetsAlways Top
MEET OTHERS AND SHARE KNOWLEDGE
RECENT 100 POSTS
Most Used Circuits as Mini Projects
CLICK TAG TO SEE RELATED ARTICLE
1 watt LED AC Capacitor Automatic light battery charger battery charging Battery maintenance Battery monitor BC547 BC 547 BC557 Binary counter Bluetooth capacitor Capacitor power supply CD4060 Cellphone computer Emergency lamp emf Fire alarm flash memory IC555 Infrared Integrated Circuit IR LED IR Sensor LCD LDR Lead acid battery LED LED Lamp LED light LED resistor Light emitting diode Liquid crystal display Lithium ion battery LM3914 Mobile phone Mobilephone Monostable MOSFET Mosquito Photodiode Phototransistor Piezoelectricity Piezo element PIR Sensor Pixel Power Power supply Regulated power supply Relay Resistor Schmitt trigger SCR Smart card SMPS solar cell solar charger Solar energy Solar panel Spike protector Stress Thermister Transformerless power supply TRIAC TSOP 1738 tubular battery Ultrasound Visible spectrum Voltage white led White LED Lamp X rated capacitor ZenerClick Date to See Postings
You must be logged in to post a comment.