solar panel current problem - Electronic Circuits Projects Diagrams Free

electrominds · 5th November 2009, 07:16 PM

i connected 2 solar panel of 130 watts in parellel. single solar panel should give 8.2 ampere so connected parellel that must give atleast 16 ampere. but it gie only 7.9 ampere ie 4.2 amp & 4.5 amp from ist and 2nd cell if measure individually. also when i connect load i.e 145 AH battery very close to parellel connected solars then all thing alright give 16 amp. is it line or distance or cable loss? if yes then how can i solve my problem

**Nigel Goodwin** · 5th November 2009, 08:37 PM

130W is the theoretical maximum, think sahara desert at noon - if you're getting half that current, you're probably doing pretty well?

foobillious · 12th November 2009, 10:31 PM

actually to get the full current it'd be more like sahara desert at noon on a very sunny but cold day.

Mr RB · 13th November 2009, 12:51 AM

Connected to a 16.9v battery.

deepak george · 13th November 2009, 07:54 AM

try using high current carrying wires to connect it to the battery....probably ur wires are not able to carry the current....
check if the wires are gettin heated..if they are,use thicker wires that can carry atleast 20amp...this should solve your problem

Tedfred · 19th November 2009, 08:47 AM

Ok here is how it works. The ohms law in simple states that the panels delivers voltage, and the battery draws current off of the panels. So you need to look at the battery for the answer. For the monument we will replace the battery with a big adjustable resister. Start with a high resistance and very little current will be drawn off of the panels. Lower the resistance and the current increases until you get 16 amps and as you stated you will get 16 amps. Or there about for the two panels. Now place a volt meter across the panels and you will find maybe 10 volt or 11 maybe 12 but not likely more then 12 volts. Now back to the battery. A fully charged battery requires 13.8 volt or more before it starts drawing current off the panels. To get the battery to pull off 16 amps of current the volt will have to be in around 14.5 volts This is just the way batteries work. If run the battery clear down you will find that you will have a good 16 amps of current for a short time. And the battery will only have a small charge on it. and then back to the 4 amps or so. To fix this dilemma you will have to add a few more cells to each panel to increase the voltage from the 12 or so volts to 14 volts or so. There are special inverter to handle this job but they are not cheep.

chemelec · Today, 12:22 AM

Post #3 is Correct.

Post #6 is Probably Not.
Most Solar panals Made for charging 12 volt Batteries have an Open Voltage of around 17 to 18 Volts.
Tis is more than enough voltage to charge at Full Current.
Assuming you have Enough Sunlight.

"Like the Sahara Desert, 12 Noon, Hottest Day Ever and with the Panal at 90 Degrees to the Sun".

But on Some panals, rated current is at a DEAD SHORT, also assuming the above conditions.

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5th November 2009, 07:16 PM	#1
electrominds	solar panel current problem i connected 2 solar panel of 130 watts in parellel. single solar panel should give 8.2 ampere so connected parellel that must give atleast 16 ampere. but it gie only 7.9 ampere ie 4.2 amp & 4.5 amp from ist and 2nd cell if measure individually. also when i connect load i.e 145 AH battery very close to parellel connected solars then all thing alright give 16 amp. is it line or distance or cable loss? if yes then how can i solve my problem

5th November 2009, 08:37 PM	#2
Nigel Goodwin	130W is the theoretical maximum, think sahara desert at noon - if you're getting half that current, you're probably doing pretty well? __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

12th November 2009, 10:31 PM	#3
foobillious	actually to get the full current it'd be more like sahara desert at noon on a very sunny but cold day.

13th November 2009, 12:51 AM	#4
Mr RB	Connected to a 16.9v battery.

13th November 2009, 07:54 AM	#5
deepak george	try using high current carrying wires to connect it to the battery....probably ur wires are not able to carry the current.... check if the wires are gettin heated..if they are,use thicker wires that can carry atleast 20amp...this should solve your problem

19th November 2009, 08:47 AM	#6
Tedfred	Ok here is how it works. The ohms law in simple states that the panels delivers voltage, and the battery draws current off of the panels. So you need to look at the battery for the answer. For the monument we will replace the battery with a big adjustable resister. Start with a high resistance and very little current will be drawn off of the panels. Lower the resistance and the current increases until you get 16 amps and as you stated you will get 16 amps. Or there about for the two panels. Now place a volt meter across the panels and you will find maybe 10 volt or 11 maybe 12 but not likely more then 12 volts. Now back to the battery. A fully charged battery requires 13.8 volt or more before it starts drawing current off the panels. To get the battery to pull off 16 amps of current the volt will have to be in around 14.5 volts This is just the way batteries work. If run the battery clear down you will find that you will have a good 16 amps of current for a short time. And the battery will only have a small charge on it. and then back to the 4 amps or so. To fix this dilemma you will have to add a few more cells to each panel to increase the voltage from the 12 or so volts to 14 volts or so. There are special inverter to handle this job but they are not cheep.

Today, 12:22 AM	#7
chemelec	Post #3 is Correct. Post #6 is Probably Not. Most Solar panals Made for charging 12 volt Batteries have an Open Voltage of around 17 to 18 Volts. Tis is more than enough voltage to charge at Full Current. Assuming you have Enough Sunlight. "Like the Sahara Desert, 12 Noon, Hottest Day Ever and with the Panal at 90 Degrees to the Sun". But on Some panals, rated current is at a DEAD SHORT, also assuming the above conditions. __________________ I No Longer accept Private Messages on here. All Emails to me Must Contain the Word \"Electronic\" in the \"Subject Line\" or they go Directly to my Junk Mail Folder. Email me at: chemelec@hotmail.com Website: http://www3.telus.net/chemelec