My current solar system for home
- 12V 100W polycrystalline Solar Panel.
- 12V 75Ah Lead Acid solar tubular Battery.
- PWM 12V 10A Solar Charge Controller.
- 12V Input and 200VA Output Inverter.
Battery not getting charged fully daily because solar panel is getting around 3-4hours sunlight and that too includes sunlight at non-90 degree conditions.
So, I want to add an additional solar panel[preferably 200W or more] which will get 90 degree sunlight from 1pm to 5pm. Also, we get around 50 minutes of on grid supply. During this time inverter charges the battery too.
My questions as per my whole day research
If I add a 24V 200+W solar panel, I have to connect the panels in series because parallel means same voltage but ampere gets added.
Series means same ampere but voltage gets added.
In this cases what changes are needed to charge the 12V battery?
I guess someone will suggest MPPT controller. What is the best controller available in India? budget max6000INR
To avoid huge costs and hastle for the above requirement if I go with 12V 150W panel, then I will just need to connect my 12V 10A with a new 12V 20A controller in parallel to draw 8.6+12.5A=22A approx. current from solar panels.Am I correct here?
During a hot and shiny summer how much watts does a 100W panel produce in 90 degree sun conditions? What is the worst output that I will get in rainy season?
While charging battery from the inverter during grid supply, I see the inverter shows around 6A-9A current supply to the battery. Is it the current only that counts how fast the battery goings to be charged. Does change in voltage plaWattage (Wp) : 100 Voltage at Max Power, Vmp (V): 18 Current at Max Power, Imp (A): 5.56 Open Circuit Voltage, Voc (V): 22.3 Short Circuit Currrent, Isc (A): 6.1y any role?
I want to pull as much current as possible from grid and put it to my battery during that 50min time. What device will let me do so? Logically to charge a 12V 75Ah battery from 0-100 we will need something that putts 900W of power into the battery in an hour.
900/12=70A approx. How much Ampere is safe for longetivity of battery?
P.S: In any circumstances safety and device efficiency is my priority.Please excuse any non-sensical thing if I mentioned above.
As per Russel McMohan's response to this question, I have some doubts when I tried to search more about the topic. Thanks a lot for your efforts sir.
- In case there are 2 12V panels:
First Panel Specs[Poly]I own this:
Wattage (Wp) : 100 Voltage at Max Power, Vmp (V): 18 Current at Max Power, Imp (A): 5.56 Open Circuit Voltage, Voc (V): 22.3 Short Circuit Currrent, Isc (A): 6.1
Second Panel Specs[Mono]Looking forward to buy:
Wattage (Wp) : 180 Voltage at Max Power, Vmp (V): 19.95 Current at Max Power, Imp (A): 9.03 Open Circuit Voltage, Voc (V): 23.26 Short Circuit Currrent, Isc (A): 9.31
There is around 2V and 4A difference. However, I can connect them in parallel. Will there be any efficiency issue because of minor Vmp difference?
As per the link mentioned earlier [Reference1]https://solarpanelsvenue.com/mixing-solar-panels/
If both panels are connected to individual 10A PWM controllers, then there wont be any such issue like the total ampere is 2* Min Ampere from either panels because I am not connecting both panels directly in parallel here.
Now total Output that I can expect is 12V*(5.56+9.03)A=12V*14.59A=175W approx. Here I considered 12V because PWMs are known for bringing down the voltage to battery level keeping constant curent and wasting rest of the voltage.
If the above estimation is correct, how do I connect the output from two PWMs to single 12V battery?
- As per your answer on shading issue, I have fixed the 100W panel position today.However, on searching about the bipass diode, I came to know my panel also has 2 diodes inside a box on the back of the panel.
This is how my front panel looks like: https://drive.google.com/open?id=140r_sGgANmxsevVWQLI8hLYEX1kaQDJx
Rear Panel Junction Box: https://drive.google.com/open?id=1Ekw3ojjdnBEzGS11mx7G5Wf1xuO5bPkz
So, front panel in potrait mode has 9 rows and 4 columns. Basically the columns are strings as you said in your answer and rows are substrings. Two diodes are there in JB, 3 junctions(+,Center and -). One diode connected b/w +ve & Center and another b/w -ve & Center . If 1st or 2nd String are under shade,then 3 and 4 will be active.vice-versa
If 8 substrings from these 4 strings are under shade then I think the diode wont work as by pass, the complete panel will produce current equivalent to 4 strings under shade.
- On close inspection, I noticed there is a slight crack at the top end of the substring located at 1st column[from left] and 2nd row[from bottom] Is it a severe fault and how badly can it degrade the output of overall panel. I will ask for a replacement if its serious issue.