Tour of Commonwealth Solar sites:

This is a photo-intensive page so please have some patience while all the photos load ...

Many solar websites will feature beautiful buildings ... from Germany or other scandanavian countries.

While CommonWealth Solar LLC has indeed consulted for remote science research sites in Gabon, Africa - the vast majority of our work since 1975 has been in Virginia.

Final Installed 3kw system

Here are two of our installers goofing off and mimicing "The Price Is Right", celebrating completion  of this 3.3kw Photo Voltaic (PV) Solar system because it was such a beautiful day in March 2009.


This March 2009 install was in one of the the most beautiful houses we have had the honor of bringing closer to the freedom of energy efficiency and alternative energy. The Shugars house.

This is a museum quality rehabilitation of a "Fan" neighborhood house in downtown Richmond, Va. This was the 2009 feature house for the Mother's Day Home Tour .

While certainly more beautiful than many houses, it is an example of the current 2009 trend: solar in increasingly urban neighborhoods.





Alternative energy has formerly been more common in rural settings where power has always been insecure.




However recently interest has grown within urbanized areas in the environmental benefits as well as security aspects

This system is a "Grid Interactive"  system that has very low maintenance batteries to carry the system for several days if the grid goes down.





While the grid is working, excess production is sold back to the power company. Furthermore Solar Renewable Energy Certificates (SRECs) can also be sold over the power grid to other power producers or users of  "Green Tags" and bring you quarterly cash!


This is the opposite of a "Grid Tied" systems that shut down when the main power grid goes down.

Both Grid Tied and Grid Interactive systems pump excess power into the electrical grid for others to use and pay for.

This is convenient since a lot of peak power consumption is during the sunniest and hottest days when air conditioning systems are working full time.

Solar alternative energy is also more affordable now as the costs are offset by tax breaks and cash flow available from Solar Renewable Energy Certificates (SRECs).















This house has already implemented many of the reasonable efficiency efforts that make a solar Photo Voltaic system able to support this house for 3 or 4 days even in grey weather and indefinitely with careful thoughtful use and sunny days.

Brickwork had insulation added to the outside
For example, when the addition with a basement add-on was built, you can see here that insulation was applied to the outside of the basement brickwork.



The brickwork is very effectively pointed. That is, the mortar is in better shape than many houses in this century plus old neighborhood.

 Even so, our blower door test did find a few leaks that were left behind in hidden places and not obvious until after we tested the shell of the house.

Even such an excellent job of rehabilitiation will often leave gaps in the building's shell and the only way to know for sure is to run a depressurization test with a profressional energy audit.

In this case, an energy audit helps find that last significant loss of energy that will dramatically improve the effectiveness of alternative solar energy production.




The Davis House

Davis house with insert images of the tank and panel

The davis house in western Hanover, Va. had their crawl space sealed and this really helped with the cold floor under the kitchen!

The solar tank stores the heated water from the panels and has a tank within a tank that transfers that heat with almost 100% efficiency to water inside the inner tank. The inner tank then preheats the water going to the main original electric tank for backup heat on 4 grey days in a row.
Also the Kitchen table was in a bay that overhung beyond the foundation. Foam panels underneath really helped making breakfast more enjoyable.

So after some reasonable conservation,on to the solar thermal system.



The tank is mounted next to their hot water heater in the garage so of course we put the 12 foot by 4 panel on the garage. We flashed the panel so future roof maintenance will be easier. See more about roof flashing at Commonwealth Solar's Appendix page.




Tank open on top shows tank within a tank
Here's a shot of Davis's tank being assembled on-site. This is very handy when space is tight.  Even when the access is wide open such as here, these tanks can be customized to the energy consumption patterns of its installed site. These are large tanks meant to take advantage of the efficiency of time. The tank within a tank method provides nearly 100% efficient transfer of heat from the water in the solar panels to the potable water for your drinkind and showering in the inner tank.

The reason for nearly 100% efficient transfter is that this method takes advantage of time.

Given enough time, the entire universe will be one temperature. In a considerably shorter length of time, the heat will almost all go from the panel water stored in the outer tank to your drinking and shower water in that inner tank.

As you can see above, then that solar preheated water goes through insulated pipes to the main electric tank which now functions as backup heat for those occasional 4 grey days in a row. Even on overcast days, the tank will often increase the well water from some 40 degrees to 80 degrees so even on grey days, it saves them money on heating water. On several consecutive sunny days, the system actually has to cut off with a "high limit switch" to avoid going over 160 degrees !

Snow on top of panel before we installed flashing to shed snow and leaves and prevent junk from being trapped against the roof on top of the solar panelHere you can see why we flashed their roof. , during our installation Winter 2009, snow accumulated on the top. The flashing was installed after this picture and will no longer lay trapped. Leaves also will no longer be trapped.

One of the other advantages of a "drain back" system is that it is much less likely that there will be water in the solar panels to freeze and do damage.

Drain back systems also rarely if ever suffer from "Stagnation" damage from sitting in the sun  when the pump cuts off  for any reason.

Some of those reasons are that the power has gone out and the pump is not running. Or the building is on standby awaiting sale or rehab repairs. Or perhaps it is not being used during the hottest months, (say the building users went on vacation in August) or if it were a commercial building, like a school Administration building, the usage drops to almost nothing in August.





The Burger House



Looking west toward HollyWood Cemetary on Scott Burger's roof in Oregon Hill with Maxwell, one of our installers

The first PV system in Oregon Hill, a neighborhood just south of Virginia Commonwealth University in downtown Richmond, Va.

Please note the white metal flashing so that future roof shingle repair and maintenance can be done around the PV system. We painted silver coating on the roof shingles close to the system but not underneath it to protect more of the roof shingles from the Sun's Ultra-Violet (UV) rays that destroy them.
  
This is another "Grid Interactive" system that has batteries. This system was installed in a power grid that was originally built for an older neighborhood of lower electrical power consumption. These are mostly 1880s vintage uninsulated wood frame houses with mostly natural draft gas powered heaters that consume a lot of gas, but not much electricity! Very convenient when the power goes out, but not easy on the wallet. The power grid is suffering because of many rehabs and new houses recently added or updated that now have heat pumps and modern appliances such as clothes dryers, microwaves, computers and big screen TVs.

As a result, we found that the quality of the electric power was so variable that his house often ends up running on the PV panels and batteries even though the grid is not technically "down". We found on one visit that the difference between "Leg 1" and "Leg2 was over 10volts. Each "Leg" is half of the 240v that most houses receive from the power pole. Each of those legs is a "phase" that is 120 volts that most of your consumer devices plug into.
We also found that one of those legs drifted down to 105 volts, which tripped the system to disconnect from a grid suffering from BrownOut.

This variability is great for old incandescent light bulbs as they glow dimmer and dimmer and thus last longer, but if comfort and productivity with good lighting and happy computers are your goal, an older power grid creaking under the load of new development can really stress modern electronics out!

A Grid Interactive PV system like this can help with security in older grid areas. The downside was that this system often produced more power in an afternoon than the house consumed and the batteries were fully charged. This means that the panels actually stopped putting energy out becaues there was no where to send the energy! The grid was too unstable to accept the energy. This is something you might want to consider if you choose an "Grid Tied" system that have no batteries.

The bottom line is that Grid Interactive systems WITH batteries provide more security even when the grid does not appear to be "down" but just is not up to the strain of new development and big screen TVs.




Some of the older systems

... that have been installed for YEARS and/or years ago!
After all, Ken Schaal has been working on solar systems since 1976.


Bob's house ...
Solar Thermal panels on south face of main house over enclosed sun porch
Bob is one of three original thermal solar systems installed in 1976 in Ashland, Virginia a block from the railroad tracks.
In 1999 the original fiberglass glazed collectors are replaced with glass and remounted higher on the roof when the sunroom was added.
We reused the same tank.
Originally this system was a drain DOWN. In drain down there is a pressure valve to the cold water supply. The problem is that this automatic valve is a failure point and thus the system can fail to drain down at night and the panels can freeze in the winter or even at 40 degrees due to "night sky radiation".
This system was later converted to Drain BACK system in 1978.

In 1999 when sunroom addition was added, we moved the panels to the upper roof with better collectors.

Bob also had a hydrostove installed. This allowed burning wood to back up the solar on a series of grey days using a Tube and Shell heat exchanger. 
Bob had an oil boiler at that time that also supplied Domestic Hot Water (DHW). We repurposed that heat exchanger.

Later still, the oil boiler was converted to a condensing natural gas Munchkin boiler that is over 95% efficient for baseboard heat in four zones.
removed siding shows dirty fiberglass insulation showing where air has flowed THROUGH the insulation - GET AN AIR BARRIER
Bob also took the siding off to put up hardiplank because he was tired of repainting.
The dirty insulation shows air flow THROUGH the fiberglass insulation.
Insulation also therefore allowed moisture to come THROUGH the insulation and the paint pops off.

The paint pops off the wooden siding when moisture from inside is absorbed by the wood and then literally pushes the paint off the siding as the sun drives that water out of the wood siding soaked by moving moist air from inside!

Bob got the house resheathed and airsealed with housewrap to prevent air infiltration and reduce popping paint.
Hardiplank siding (being cement based) also holds the paint much better.

Energy conservation and alternative energy is a PACKAGE that takes in all factors with the house treated as a whole house system of issues.

Proof that the air leakage (expressed as the "number of air exchanges per hour") have dropped is that the food odors linger longer! He added an effective range hood exhaust system.

Insulation has other advantages: He noticed immediately after insulation was blown into the cieling, walls and crawl space was lined and insulated that the noise and vibration from passing trains was vastly reduced.

The house is now quiet ...


Bob also monitors the local weather in greater detail than NOAA including solar incidence!

 







En example of window insulation conservation work by Commonwealth Solar ...

In 1981, this amazing Libby Hill house near Libby Hill Park was featured in a Sunset Books publication entitled, "Solar Remodeling: Passive Heating and Cooling" (page 36)

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As you can see here, the foil unrolls down tracks to hold it in place.
This is very similar to currently available cellular shades that Commonwealth Solar can custom design and install with side tracks.

This is just one of the two systems of this type that Commonwealth Solar have installed.
An odd bit of corporate product history has locked this product in a kind of ownership limbo ... but there are other possibilities.
Check our moveable window insulation page for more ...








 ... more projects to come!

     Return to this page regularly for more sites and history ...


... more projects to come !
Return to this page regularly for more sites and history ...








 

If you have any further questions, please email and ask so that we know what we need to add to this appendix !

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Note: Last Update 06/19/2009

by webmaster Christopher Maxwell

CommonWealth Solar, LLC

12433 Autumn Sun Lane • Ashland VA, 23005 • (804) 798 5371