Reply
 
Thread Tools Display Modes
Old 05-02-2013, 05:26 PM   #21
Junior Member
 
Join Date: Apr 2013
Location: New Braunfels, TX.
Posts: 22
Panels
Attached Thumbnails
Click image for larger version

Name:	DSC_0020.jpg
Views:	38
Size:	58.1 KB
ID:	29484  
Attached Images
 
__________________

__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out and loudly proclaiming:"WOW, what a ride!!!
2011 Flagstaff V-Lite 30WFKS
2011 Ram Laramie Longhorn 3500 CC DRW (TUNED)
Surfer44 is offline   Reply With Quote
Old 05-02-2013, 05:29 PM   #22
Member
 
Join Date: Apr 2010
Posts: 81
Solar Down Range

These are a couple years old. I usually take about 5 pics of the solar array in case some body decides to help themselves to a freebee. Mount is the same on used on a trailer for adjustable angles. This is our lights after dark. I think the ones at COSTCO are LEDs now. Lights go out when the gen goes out.

Also that mount can be a witch. Made out of aluminum and the bolts can bind.
Attached Thumbnails
Click image for larger version

Name:	DSCN0261.jpg
Views:	37
Size:	53.7 KB
ID:	29485   Click image for larger version

Name:	DSCN0262.jpg
Views:	52
Size:	53.0 KB
ID:	29486   Click image for larger version

Name:	DSCN0268.jpg
Views:	45
Size:	56.8 KB
ID:	29487   Click image for larger version

Name:	DSCN0286.jpg
Views:	51
Size:	43.7 KB
ID:	29488  
__________________

__________________
Portagie1968 is offline   Reply With Quote
Old 05-02-2013, 07:02 PM   #23
Junior Member
 
Join Date: Apr 2013
Location: New Braunfels, TX.
Posts: 22
MPPT
The function of a MPPT is analogous to the transmission in a car. When the transmission is in the wrong gear, the wheels do not receive maximum power. That's because the engine is running either slower or faster than its ideal speed range. The purpose of the transmission is to couple the engine to the wheels, in a way that lets the engine run in a favorable speed range in spite of varying acceleration and terrain.
Let's compare a PV module to a car engine. Its voltage is analogous to engine speed. Its ideal voltage is that at which it can put out maximum power. This is called its maximum power point. (It's also called peak power voltage, abbreviated Vpp). Vpp varies with sunlight intensity and with solar cell temperature. The voltage of the battery is analogous to the speed of the car's wheels. It varies with battery state of charge, and with the loads on the system (any appliances and lights that may be on). For a 12V system, it varies from about 11 to 14.5V.
In order to charge a battery (increase its voltage), the PV module must apply a voltage that is higher than that of the battery. If the PV module's Vpp is just slightly below the battery voltage, then the current drops nearly to zero (like an engine turning slower than the wheels). So, to play it safe, typical PV modules are made with a Vpp of around 17V when measured at a cell temperature of 25įC. They do that because it will drop to around 15V on a very hot day. However, on a very cold day, it can rise to 18V!

What happens when the Vpp is much higher than the voltage of the battery?
The module voltage is dragged down to a lower-than-ideal voltage. Traditional charge controllers transfer the PV current directly to the battery, giving you NO benefit from this added potential.

Now, let's make one more analogy. The car's transmission varies the ratio between speed and torque. At low gear, the speed of the wheels is reduced and the torque is increased, right? Likewise, the MPPT varies the ratio between the voltage and current delivered to the battery, in order to deliver maximum power. If there is excess voltage available from the PV, then it converts that to additional current to the battery. Furthermore, it is like an automatic transmission. As the Vpp of the PV array varies with temperature and other conditions, it "tracks" this variance and adjusts the ratio accordingly. Thus it is called a Maximum Power Point Tracker.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out and loudly proclaiming:"WOW, what a ride!!!
2011 Flagstaff V-Lite 30WFKS
2011 Ram Laramie Longhorn 3500 CC DRW (TUNED)
Surfer44 is offline   Reply With Quote
Old 05-03-2013, 09:00 PM   #24
Member
 
Join Date: Apr 2010
Posts: 81
Have to look my model up. U have lost the old portagie. All I know is it works up to 14 volts and them she cuts us off.
__________________

__________________
Portagie1968 is offline   Reply With Quote
Reply

Tags
solar

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 07:07 PM.