Its ok? Thanks in advance!!!!. Jim Keith says: on May 23, at pm reply Yes, you may omit the reverse battery connection components. Check your wiring, and test into resistance load —if it will not work with resistive load, it will not regulate float charge voltage. Read this article: electroschematics. Sorry to hear that it is not working for you—for troubleshooting, refer to my response to amoarg69 above.
Jim Keith says: on June 14, at pm reply As soon as the battery voltage drops below the float charge voltage, it will begin charging. Actually, it does not stop charging at the float charge voltage, but the current becomes extremely low. Jim Keith says: on June 15, at pm reply Given says: on July 26, at am reply Hi Jim, I would like you to help me out, please: I am working on a semester project, I am supposed to design a Combined control device for solar charged battery and automatic emergency light.
I have been given these specifications: The developed device should monitor and control the charging of a lead acid battery from a photovoltaic panel and its discharging. The device should also control automatically and emergency light in case the ambient luminance falls below certain level. The minimum specifications are: 1. A controller should charge automatically a 7Ah lead acid battery from a photovoltaic panel until fully charged.
The battery should not get overcharged. The photovoltaic panels should be protected against reverse currents from the battery or the load. There should be a linear, ten level battery output voltage monitor with a range between 10 and 15 volts. The device should operate from V, AC power source.
The primary circuit of the power transformer should be fuse protected. Power switch for the device. An emergency light controller should operate a relay driven emergency light for ambient luminance below 20 lux. God bless! The circuit works great. I cant find a pchannel mosfet as discussed. No, it will not work in this circuit. However, this would make a good project for the future.
Given says: on September 4, at pm reply Jim my brother, do you still remember I asked for your help? Is there any substitute for that?? Navjot Singh Sains says: on September 24, at pm reply Hi Jim, Thanks for the wonderful post and sharing out your designs.
These proved very helpful for me. Can you kindly help me out, please? Thanks in advance! Also, make sure that you have a dummy load to sink the Green LED current. Navjot Singh Sains says: on September 24, at pm reply Gosh! One more question, please — can i use one of the followings? There a few question which i would like to ask you. Is there any issue if i use a electrolytic capacitor instead of a ceramic one? I replaced the electrolytic capacitor with a ceramic one and now i am able to vary the voltage of the load resistor from the potentiometer.
And is the green led suppose to light up all the time? Regards, hunter Jim Keith says: on October 4, at pm reply On the electrolytic capacitor issue, the polarity could have been reverse thus causing excessive leakage.
When setting the voltage with a dummy load, the green LED should light —during normal operation, it extinguishes when the pass transistor is saturated battery at low charge level. LEDs vary greatly in efficiency and brightness —this is to be expected.
Greatly appreciated for the time taken to reply and once again thanks for sharing your charge controller circuit. Regards, hunter Lloyd says: on October 3, at am reply Hi Jim I am busy with a semester project and I need assistance. I am designing a charger controller with MPPT. This will charger from a 75W 12V, 6. Can you assist with the code if possible. As an alternative design will your cirucit work for my kind for system should I fail with MPPT controller?
Sounds like you need a boost regulator — 12V input to 24V battery. If so, this linear regulator will not work. Using a solar panel source basically a current source , you will need a hefty energy storage input capacitor to source the inductor charging circuit. Because the output waveform is anything but pure DC, the current measurement must be integrated over a time period —to make this simple, drive a VCO with the current signal and use your PIC to simply count integrate pulses —no engineering units necessary — just tune for maximum count.
Ali says: on October 9, at pm reply hello. I need controller circuit diagram to charge that. Is it possible? Jim Keith says: on October 10, at am reply Unfortunately, this circuit cannot do this function. What you need is a boost type regulator that is more complex than this circuit—requires an inductor.
Ali says: on October 12, at am reply Thank you Jim. Would you please help me to find suitable circuit diagram. Do you think I need two circuit or one circuit do it? Otherwise the regulator may drag the solar panel voltage so low that most of the power is dissipated in the internal resistance of the solar panel. However, electroschematics. Ali says: on October 12, at pm reply Hello Jim. I will be highly appreciate if you help me to find suitable circuit to my propose.
Regards, Ali Ali says: on October 13, at am reply hello Jim. Thank you for your help. I will be highly appreciate if you explain me about. Ali says: on October 13, at am reply Hello again Jim. I have a question. Is it correct? Rup says: on October 14, at am reply I have a 20W solar pannel and a 12V 7. I want to make a sutiable charge controller for the battery. And if it does, can tell me how does it work? Hope to hear from you soon.
Noel says: on November 16, at am reply hi jim! Thanks and regards, NOEL It would also require 4 heatsinks. So you see that this is already near the feasible limit of a linear regulator. Noel says: on November 16, at pm reply Hi Jim, i am really much thankful with your explanation using 4 FQP27P06 devices in parallel having 1 series diode each.
Run the fan from the solar panel raw voltage via its own LM voltage regulator so that it runs only when the sun is shining. Jim Keith says: on November 19, at am reply This is not a fast charger, and I am unsure how you plan to employ an electrolytic capacitor—need more info. About the electrolytic capacitor, I have constructed your circuit by using that type of capacitor.
Did I need to replaced the capacitor to ceramic X7R to prevent any malfunction during the charging operation? Thanks in advance Merry Christmas and may God bless you always. NOEL It is working very good. I am curious if they can withstand the same current value even they have different sizes.. The voltage can only be varies as the output does not connected to any load.
You have an error somewhere. Good luck! Jesse says: on December 22, at pm reply Good Day! Hi sir Jim, after the voltage adjustment, the dummy load resistor should be remove or remain in the circuit??? Thanks Greg Banks says: on December 27, at pm reply Jim, thank you so much for publishing your design. A couple of questions. Did you choose the 6v Zener over a 5. The 5v zen ers are usually used in power supplies as they have an almost zero drift with temperature.
Other voltages do. Just wondering if you had considered that and it was deliberate. How much larger do you think it would be possible to upscale the design, parallel connecting FETs etc. Yes a big investment. Every commercial charge controller tried has produced unacceptable RF noise.
We can spare the power for the efficiency loss. Perhaps 3, one on each 11 A panel. Any thoughts would be greatly appreciated. Greg Banks says: on December 27, at pm reply Jim I see you have already answered a similar question regarding parallel connecting FETs.
Jim Keith says: on December 28, at am reply I generally use 6. If you use forced air cooling this could be extended to 11A. The fans could be set up to run only when the solar panels are putting out power. Note that if outputs are paralleled, they tend to act goofy because one will start limiting current before the others—it is not easy to get them to load share after they reach the set voltage—not really necessary either. Jim Keith says: on January 17, at pm reply The first comment identifies the typos—not really circuit errors.
The IRF is good for this application, but more expensive. Ashok says: on January 18, at am reply means your shown at top page in this article schematic diagram is final so it is ready to assemble. Avirup Saha says: on January 21, at pm reply I already get mail, but I want to know the charge controller ckt for 12v 7. Ashok says: on January 24, at am reply Sir i made this circuit now i want one circuit for deep discharge protection of battery with auto cutoff please suggest me.
Jim Keith says: on January 30, at pm reply Sounds like your battery is fully discharged or damaged dead. Try charging it across an automotive system for about 15min to see if it comes up to normal voltage range.
Then connect solar panel directly across battery and make some more measurements—this will not harm the battery short term 1 or 2 days. When you know your battery and solar panel function normally, reconnect the charge regulator and make new measurements.
Ashok says: on January 30, at pm reply Actually i check the battery voltage it gives Ashok says: on January 31, at am reply actually i want to know that, can we change the voltage at charger controller at battery connection?
Ashok says: on February 2, at pm reply Sir Now i check two days battery get charged Jim Keith says: on February 3, at pm reply If you followed the instructions and set the voltage to 14V using a dummy load, it will not overcharge. It appears that your battery is significantly discharged and may require a few more days to get to 14V —at that point, the green LED will come on and it will continue to charge until the current drops to a very low level.
Beyond this, parallel devices and large heatsinks are required —not really feasible for a linear regulator like this. Of course, the only time it runs hot is when the battery is beginning to top off at max voltage. Perhaps you can parallel two 6A4 diodes in close proximity to each other so that they will tend to load share.
Mitra Shah says: on February 16, at am reply Sir can i use this solar charger for a 15 W pannel Jim Keith says: on February 16, at pm reply This will work fine with a 15A panel. The panel power indicated is a maximum.
Mitra Shah says: on March 13, at pm reply Jim thanks for your reply. I just wanted an advice on my project, my project needs a solar charge controller which connects 12v 7ah battery and a load having a mobile charger, a LED module and a Dc fan i have counted the load and came to a decision on using a 12v 7ah battery.
Jim Keith says: on March 13, at pm reply Yes, this is good for your application. Mitra Shah says: on March 13, at pm reply even more where should i connect the load in this solar charge controller. If not can you help me find a circuit that will? Thanks jason says: on March 21, at pm reply It is a 12 Volt battery Jim Keith says: on March 22, at pm reply Your solar panel voltage is too high for this circuit to handle.
What you need is a relay based charger control that measures battery voltage and drops the relay when the voltage exceeds the set level 14V. I have been considering posting a circuit that does this —quite simple, but effective at preventing overcharging. I think I found one that will work. It has it so you can tune your min and max cutoffs and is relay based. Thanks for the quick answer. The circuit looks OK with upper and lower thresholds. With solar unlike wind , there is no need to dump the solar panel when the battery voltage exceeds the upper threshold.
Please note i cant buy another solar panel or buy a mppt charge controller as i cant afford that, so my capacitor idea if it is a good idea we all could use to gain more amps if this is not the case please let me know Jim Keith says: on March 23, at pm reply Unfortunately, there is no way to increase the solar panel output current via the use of capacitors.
Multimedia says: on March 23, at pm reply i dont mean over unity or free energy i mean stored energy to act as a boost and make current seem more constant to enble better or longer charge time or more consistant as the main purpose of caps are to stabelize current flow, or even out spikes so its more consistant! Jim Keith says: on March 24, at am reply OK, I see what you are getting at —two energy storage devices: capacitor and battery.
SPWM Arduino inverter, image source: www. AZZDK, image source: electronics. October 12, Lost your password? Please enter your email address. You will receive a link to create a new password. Toggle navigation. Embed Script. Size px x x x x This electronic security system can be used in banks and other high security areas.
A normal electronic security system will have a transmitter and a receiver. The transmitter sends out an IR laser and this will be received by the receiver.
When an intruder walks past the device, the IR beam is cut and thus the alarm is activated. But, this system has some major disadvantages like limited range and poor line of sight. These disadvantages are eliminated through the PIR sensor circuit explained below. The sensor is basically a pyroelectric device.
0コメント