40amp @ 24 to 220 VDC SSR $15 - Page 2

OffGridKindaGuy · 12-07-11, 05:32 AM

As per specs.. Under "Ideal" conditions..

Short Circuit Current - 7.68A per panel

Configuring the 4 panels as a 24 volt system (parallel instead of series) will multiply your current but the normal operating voltage will remain the same as one panel. Having the panels connected in series, you are limited to the current of one panel.

Is your experiment an attempt to produce heat?

Xringer · 12-07-11, 07:06 AM

It's too bad a short circuit doesn't produce any watts of heat...
And, I'm kinda stuck with a fixed 10 ohm load.

Yeah, I want heat..

AC_Hacker · 12-07-11, 07:17 AM

Quote:

Originally Posted by Xringer

Yeah, I want heat..

Evacuated tubes.

-AC_Hacker

OffGridKindaGuy · 12-07-11, 07:26 AM

Series the resistors and you'll get more heat.

Xringer · 12-07-11, 07:32 AM

So, four 40 ohm resistors in series is going to get me more heat?
Ever hear of Ohm's Law??

OffGridKindaGuy · 12-07-11, 08:42 AM

Yes, but the single resistors are built to dissapate their designed wattage. Leaving them paralleled creates the sum of the 4 combined. Series connection lowers the load by increasing resistance from 10 to 160 ohms, hence allowing more "friction" to produce heat.

Xringer · 12-07-11, 11:27 AM

I get it, you're pulling my leg..

Just in case anyone else ever reads this thread, here's a pic..

I=Current in Amps
P= Power in Watts
E= Potential in Volts
R= Resistance in Ohms

Or, use V for volts, instead of E for volts.. (Which some find confusing).

Here's some more stuff..
Georg Ohm - Wikipedia, the free encyclopedia

OffGridKindaGuy · 12-07-11, 03:32 PM

This is fun! Did an experiment of my own..

4 ohm wire wound resistor... Adjustable voltage/current power supply...

More to come..

OffGridKindaGuy · 12-07-11, 06:43 PM

Ok.. Here's what I did. Nothing scientific but proved a point..

The power supply has a potential of 50 amps and voltage adjustable between 0-15 volts..

Across a 4 ohm wire wound resistor, I applied 3 volts with unbridled current. The resistor warmed up but didn't pull very much current. I then increased the voltage to 12 volts (4 times) and it showed more current draw and heated up much quicker! The same resistor made more heat and drew more current by increasing the voltage..

Never claimed to be an engineer but I can see that my vision on what should happen was wrong. I'm a good sport, though. I'll take my beatin'..

Anyhow, after thinking about this a little more, maybe your choice of a heat producing device could be replaced with something with less bulk than those big resistors. It would take some energy just to heat those big boys up!

Perhaps a toaster or part of a heating element from a drier?

Xringer · 12-07-11, 07:56 PM

The resistor load is rated at 1,000 watts. The panels can put out 800w,
so they are a pretty good match, power wise..
http://ecorenovator.org/forum/solar-....html#post6937

If I had a 16.43 ohm resistive load, that would be the prefect match for my 800w array.
115v / 16.43 ohms = 7 amps! (7a x 115v = 805 watts)..

10 ohms is just too low. It was made for the 500w tracker array..

It's not engineering, it's simple Arithmetic..

12-07-11, 05:32 AM	#11
OffGridKindaGuy Hi-Tech Hillbilly Join Date: Mar 2010 Location: Ohio Posts: 97 Thanks: 1 Thanked 16 Times in 15 Posts	As per specs.. Under "Ideal" conditions.. Short Circuit Current - 7.68A per panel Configuring the 4 panels as a 24 volt system (parallel instead of series) will multiply your current but the normal operating voltage will remain the same as one panel. Having the panels connected in series, you are limited to the current of one panel. Is your experiment an attempt to produce heat? __________________ If it don't, I'll always think it shoulda..

12-07-11, 07:06 AM	#12
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	It's too bad a short circuit doesn't produce any watts of heat... And, I'm kinda stuck with a fixed 10 ohm load. Yeah, I want heat.. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..

12-07-11, 07:26 AM	#14
OffGridKindaGuy Hi-Tech Hillbilly Join Date: Mar 2010 Location: Ohio Posts: 97 Thanks: 1 Thanked 16 Times in 15 Posts	Series the resistors and you'll get more heat. __________________ If it don't, I'll always think it shoulda..

12-07-11, 07:32 AM	#15
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	So, four 40 ohm resistors in series is going to get me more heat? Ever hear of Ohm's Law?? __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..

12-07-11, 08:42 AM	#16
OffGridKindaGuy Hi-Tech Hillbilly Join Date: Mar 2010 Location: Ohio Posts: 97 Thanks: 1 Thanked 16 Times in 15 Posts	Yes, but the single resistors are built to dissapate their designed wattage. Leaving them paralleled creates the sum of the 4 combined. Series connection lowers the load by increasing resistance from 10 to 160 ohms, hence allowing more "friction" to produce heat. __________________ If it don't, I'll always think it shoulda..

12-07-11, 11:27 AM	#17
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	I get it, you're pulling my leg.. Just in case anyone else ever reads this thread, here's a pic.. I=Current in Amps P= Power in Watts E= Potential in Volts R= Resistance in Ohms Or, use V for volts, instead of E for volts.. (Which some find confusing). Here's some more stuff.. Georg Ohm - Wikipedia, the free encyclopedia __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..

12-07-11, 03:32 PM	#18
OffGridKindaGuy Hi-Tech Hillbilly Join Date: Mar 2010 Location: Ohio Posts: 97 Thanks: 1 Thanked 16 Times in 15 Posts	This is fun! Did an experiment of my own.. 4 ohm wire wound resistor... Adjustable voltage/current power supply... More to come.. __________________ If it don't, I'll always think it shoulda..

12-07-11, 06:43 PM	#19
OffGridKindaGuy Hi-Tech Hillbilly Join Date: Mar 2010 Location: Ohio Posts: 97 Thanks: 1 Thanked 16 Times in 15 Posts	Ok.. Here's what I did. Nothing scientific but proved a point.. The power supply has a potential of 50 amps and voltage adjustable between 0-15 volts.. Across a 4 ohm wire wound resistor, I applied 3 volts with unbridled current. The resistor warmed up but didn't pull very much current. I then increased the voltage to 12 volts (4 times) and it showed more current draw and heated up much quicker! The same resistor made more heat and drew more current by increasing the voltage.. Never claimed to be an engineer but I can see that my vision on what should happen was wrong. I'm a good sport, though. I'll take my beatin'.. Anyhow, after thinking about this a little more, maybe your choice of a heat producing device could be replaced with something with less bulk than those big resistors. It would take some energy just to heat those big boys up! Perhaps a toaster or part of a heating element from a drier? __________________ If it don't, I'll always think it shoulda..

12-07-11, 07:56 PM	#20
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	The resistor load is rated at 1,000 watts. The panels can put out 800w, so they are a pretty good match, power wise.. http://ecorenovator.org/forum/solar-....html#post6937 If I had a 16.43 ohm resistive load, that would be the prefect match for my 800w array. 115v / 16.43 ohms = 7 amps! (7a x 115v = 805 watts).. 10 ohms is just too low. It was made for the 500w tracker array.. It's not engineering, it's simple Arithmetic.. __________________ My hobby is installing & trying to repair mini-splits EPA 608 Type 1 Technician Certification ~ 5 lbs or less..