Freedom is...: 8/28/11 - 9/4/11

Saturday, September 3, 2011

First Solar, Amorphous Panel

  Any off grid power generating system has 3 basic components but may have several depending on the accessory options you would choose to employ. The first is the generating portion of the system; solar panels, windmill, generator, or hydroelectric generator. There are still others but these are apparently the most common.

Sunforce 50048 60-Watt Solar Charging Kit In this case I am going to be focusing on a solar generating system or PV. At the very least you are going to have a panel, a control module, and a battery to collect any power you don't use as it is produced, or for use in off peak production hours (at night). I have already answered the question "what is amorphous"  so I don't want to get into that here. But I do believe it is a good start to your first solar experience. Mostly due to cost. 

  Even if you manage to find an excellent extended warranty you may still be a little intimidated with the knowledge you are learning on a panel that costs more than the price you would have had to pay for a whole setup containing an amorphous panel. Also, the bit about it being a little more forgiving in the areas of shadowing and breakage, as I mentioned in the other article. In fact, I have seen people demonstrate thin film amorphous panels with holes actually punched through them every few inches with a hole punch to illustrate their durability and ability to produce even in these extremes.


 You will have to decide what particular kind of panel you want to start off with though. But even if you do decide to start off with a higher production panel I think it would still be wise to have some amorphous stuff around to pick up some rays when the higher output panels don't have enough light to start producing. So you could still have a place in your solar array for these panels even after you are comfortable with your newly acquired solar expertise.

 After you have decided what kind of panels to get you are going to run the power they produce through some kind of controller to access it. If you try to run anything more complicated than a dc fan off of the raw power from the panel than you are inviting disaster. Even something as simple as the fan may smoke at the open circuit voltage of panels which can be around 23ish volts in some cases. And even at that it is all variable depending how much light energy is actually being processed by your panel. 

  After the controller you will be in need of a battery to store the juice you produce. It is best to use the energy as it is collected due to inevitable losses in its storage, but that is impractical at times. I try to do most of my "heavy lifting" during peak production times, with "fresh off the vine" energy to curb my storage losses.  Like grind my coffee beans with the 100watt grinder or run my high speed rotary Dremle tool that uses similar wattage. 


  There are several choices to make in the battery department too. There is a mind bending amount of information on batteries that range form the metal lined jars recently discovered in the Egyptian pyramids to the sexiest noble metals only seen in R&D labs currently under development.  


 The most common variety currently available inexpensively though is of the lead acid sort. Even if we narrow that field down there is an incredible assortment of voltage and construction variants. 

 I am going to suggest here to use a common deeep cycle, marine grade, 12 volt, vented(the kind you can take the caps off of and add distilled water to),  lead acid, battery. Try to avoid the duel purpose variety for now, but if you can't find anything else it will do. Your battery should be over 100 ah, more is better here. This is an industry standard measurement that is meant to imply that a 20amp load will fully discharge the battery in 5 hours. You see ah = amp hours. So with a little simple math you can determine how long your battery will last (when fully charged), with the load you intend to put on it.  There is some cause for caution here though due to marketing implications that would incourage the purchase of a lesser battery. Don't be confused by other capacity designations like CCA =cold cranking amps or, CA =cranking amps, or HCA = hot cranking amps, or RC = reserve capacity.

 Unfortunately I can't, in good consonance, offer you a link. You see the lead acid batteries have an electrolyte in liquid form. This means it can spill and shipping is prohibitively expensive.  I encourage the use of this kind of battery though due to the fact that it gives you the opportunity to witness the effect of charging and discharging on the fluids in the cells (ACID). This is of value for 2 reasons I can think of right now.

 One is with an inexpensive controller that comes with most of the starter sets the voltage to the battery may fluctuate to a value too high to be acceptable, causing evaporation of hydrogen from the electrolyte. In a vented battery its no big deal, you just add more DISTILLED water. But in a sealed "maintenance free"  battery it will vent, If the input voltage creeps to high, damaging the battery and may-be you. 

 Two they are usually more expensive than their vented lead acid equivalent for the same AH rating. And so are the charging regulators (in some cases) required to offer you the kind of confidence necessary to feel secure in your first solar experience . So you are just going to have to find a local store to go buy a battery at.  Just remember the higher ah rating the better.

  








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Tuesday, August 30, 2011

Mono-crystalline Panels

HQRP KIT (170W (85W+85W) Monocrystalline Solar Panel, 20A Solar Charge Controller / Regulator, 200W Power DC / AC Inverter, Red & Black Clamps and Cigarette Lighter (Female)) for Solar Systems   
   Mono-crystalline solar cells are created by first growing actual crystals or boules of silicon then slicing them thin to put into solar panels. This is the oldest and most efficient type of solar cell commonly available. 

   Pictured here is a relatively low cost set to help you get started on your first solar experience, if you have a few more dollars to spend than would be necessary for a poly setup of the same wattage production. 

 Being more efficient, a mono-crystalline solar array will take up less space than either an amorphous or a polycrystalline solar system with the same output value. So this would be the perfect type of panel to buy if space is too much of an issue. This solar panel will suffer the same setbacks as a poly system but it will produce more peak power.  Being that this is a set though you will have fewer headaches in the initial install (which can make a first solar experience rough) 

 Even with the initial extra expense of this type of panel you should still see a savings in your utility bill by the first year easily. If you are really serious this kind of technology is the longest lived at a typical loss of efficiency of .5% or less a year. This particular guarantees 90% of total expected production to still be available in this panel for 10 years.  


  This is an excellent choice for a first solar set if you are in it for the long haul. 




 Pros

   Mono-crystalline panels have higher output levels per inch than the other technologies commonly available today.

  Mono-crystalline panels have longer expected lifespans than other tech

  Mono-crystalline panels are the old kid on the block so this is tried and true tech




 Cons

  Pretty much the same as the poly panels they are of rigid construction only and suffer loss due to shadowing.

   

HQRP KIT (170W (85W+85W) Monocrystalline Solar Panel, 20A Solar Charge Controller / Regulator, 200W Power DC / AC Inverter, Red & Black Clamps and Cigarette Lighter (Female)) for Solar Systems   The set pictured here in particular comes with a solar controller with protections for your battery and other appliances. 

  It also has an inverter so you can plug your AC stuff right in.
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Monday, August 29, 2011

Subsidized Solar

  I guess you may have noticed I have been posting lately on the solar panels available today. I am only part of the way through but I saw this link and thought the middle of the topic would be a good place for it. What it is, is a site that tells you what kick-backs you can get for going solar in your local area. 

  That's right kick-backs. (finally we get a shot at a few hea?)  There are state and federal dollars already set aside for you to make your home more energy efficient.  Imagine that, you pay less on your power bill and get a discount on setting up the system.  Some of the money is available as tax credit and I think there is some grant stuff on there too. I don't have time to search out what kind of stuff is available in every state but you can. Here is the link.  Da Link 

 Good luck. I hope you find something cool. It may not make an install free but I think you can get financing on this kind of thing and probably beat the power bill costs in relation to your payments.
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Polycrystalline Solar Panels

Polycrystalline Solar Panels

 The poly panels are the next step up from amorphous panels in terms of efficiency, you can get a bit more watt for size, so you don't have to give up as much real estate to catchin rays.
Sunforce 39810 80-Watt High-Efficiency Polycrystalline Solar Panel with Sharp Module
   
  They are however a little pricier than their less efficient kin, but due to the manufacturing process utilized in their construction. They are still a good, lower cost alternative to fill your, first solar, need for power. 

  Polycrystalline cells are typically cast from a molten silicone solution to create a many crystal type of structure, hence the term Polycrystalline. The panel shown here is 12.7% efficient as apposed to the amorphous type that has an efficiency rating somewhere around 6-8 %. 

  Pound for pound though you will get a lot more bang for your buck with this kind of panel overall. Manufacturing costs are so much lower than the more efficient Mono-crystalline panels, and there have been advances in the efficiency of the poly type to make them a real competitor. If you have a little more to spend this would make a good first solar panel.

  Pros
   Polycrystalline panels are more efficient than thin film solar panels               (amorphous)
 
  Polycrystalline panels take up less room than thin film panels to collect the same wattage


  Polycrystalline panels are less costly to manufacture than mono panels so the consumer pays less overall per watt


 Cons
   Polycrystalline panels are heavier than amorphous and delicate to handle due to their cast construction
  
   Polycrystalline panels suffer greater losses from shadowing on part of the collection surface


  

   This kind of panel is the most popular in use as of now, due to the low watt to dollar ratio. This is certainly the way to go for a first solar system if you have a place to mount them that is rigid and out of the shade. Perfect for the roof of a house or in a field without any overshadowing structure.
  


 
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