Eastern Shore MD,Solar Service, Home Solar Panels
Written by Lisa Walsh

Non-South facing solar panel installs in Maryland, DC and Virginia

The Design

Eastern Shore ,MD,Solar Service, Home Solar PanelsWhen planning a solar panel system for your home, the first consideration for any solar designer is the tilt and orientation of your roof areas.  We need to know which roof(s) will ensure the most optimum solar output – which translates to the best Return on Investment.   For us here in Maryland, the most optimum solar roof orientation is Due South at 180 degrees.  Of course, not everyone has this perfectly oriented roof and our customer base consists of homes that have South, West, East and everything-in-between orientations.  Occasionally we even install on North-facing roofs if the pitch of the roof is low enough that panels are close to flat, or can be tilted southerly.

For homes that face East-West, you may be wondering which roof would best suited for solar.  This is a good question given the fact that the output of your solar panels is directly related to your Return on Investment and how quickly the panels can pay for themselves.

If either East or West favors a more Southerly angle, then that would likely be a more favorable roof.  Assuming that there aren’t issues related to shadingor obstructions caused by chimneys, vents, skylights and other roof-placed items.

If the house has a perfectly split East-West orientation, with all things equal – the next consideration would be roof angle; the lower the tilt (i.e. closer to horizontal) – the more solar energy will be generated over the course of the day.  If the tilt on either side is the same then we would usually favor the West facing side.   Here in Maryland, DC and Virginia we tend to have cloudier mornings, and sunnier afternoons going into dusk.  Therefore we want to capture the late afternoon sun (west facing) more than early morning sun (East facing).  Of course, should you happen to have a tree, chimney or other obstructing factor(s) on the West roof – we’d favor the East.

The Economics

Homeowners looking at an East-West installation often have concerns as to whether or not their system will be profitable enough, compared to its south-facing counterparts.    Disqualifiers for cost-effective solar systems include shading and limited available roof space.  Rarely, however, is a home found unsuitable due to a Non-Southerly facing roof alone.

To illustrate, following is a comparison of a 10kW system’s output respective to East, West and South facing orientations.  Data compiled using the National Renewable Energy Laboratory (NREL) weather data patterns for Baltimore, MD –

10kW system installed on a 20 degree pitched roof with zero shade

 SOUTH (180 degrees)WEST (270 degrees)EAST (90 degrees)
ANNUAL OUTPUT13,224kWh11,389kWh11,328 kWh
*Annual $avings$1853 per year$1594 per year$1586

*Savings based on a conservative $3.00/watt installation, and $0.14/watt BGE rate

Data from PV WATTS

As illustrated, although perfectly South would be ideal, the East and West orientations provide a competitive amount of solar and would add only a few months to the payback period.  If you were choosing between East and West (as opposed to installing on both), the difference is nominal.  The choice of which roof may come down to aesthetic preference, distance to utility meter and regional weather patterns.

Residential Solar Panels,Solar Energy
Written by Rick Peters

SES Embraces SunPower Partnership

Residential Solar PanelsMany of our prospective customers have been waiting to buy their panels in the hopes of significant advancement. “I want the technology to mature ” they say, “ and be state-of-the-art”. Well, the closest you can get to those standards with a production panel is with SunPower.

Ask around, do some Google searches. You’ll learn quickly that SunPower is considered the best with very little debate. In fact, it’s by far the best. This American born company launched out of the US university research system (the founder was a Stanford professor) has sustained a 23 year run to be acquired recently by a global energy company.

At Solar Energy Services we’re excited to report that we are now a SunPower certified dealer. We’ve always wanted to offer the very best PV product and now we can. SES is proud to tie our 35 year commitment to the industry to the world leader in solar panel manufacturing.

Many are aware that the cost efficiency of installed solar has improved dramatically in the last 5 years due to efficiencies gained through price competition, distribution improvements, development of installation techniques, and other process improvements. However, the physical efficiency of solar cells has advanced more slowly than most have hoped. The standard Chinese panel being installed by the majority of installers today (especially the large leasing firms) are in the 14-15% efficiency range. A few solar manufacturers have been able to stay notably ahead of the pack. SunPower remains out front with their standard 327 W panel (E20) at 20% efficieny. Sunpower’s new “X” (E21) is 21% efficient! That’s right, over 40% more efficient than the average panel out there. The X begins to ship in April 2013 – next month.

SunPower’s Maxeon cells are the industry leader in reliability and durability also. They’ve had only180 defects out of 7 million panels. That’s right, 1 in 39000! The Maxeon cell has redundancy in contacts, accommodating wear from thermal expansion. It has backside contacts that provide increases collection on the sunny side. They are highly durable with the best impact resistance ratings. They are backed by a solid company with great support and a bright future.

To recap, the physical efficiency of solar cells has been relatively stagnant, with the exception of a few leaders that have developed slow and steady progress. SunPower has led the way. The company has been around for over 23 years. They have the most durable solar cell in the industry and the highest performing. I must confess, the 3 year old solar PV system on my roof has panels made in China. If I were installing today, there is no doubt I’d choose SunPower…

Solar Service, Home Solar Panels Washington DC Solar
Written by Rick Peters

SES Embraces SunPower Partnership

Many of our prospective customers have been waiting to buy their panels in the hopes of significant advancement. “I want the technology to mature ” they say, “ and be state-of-the-art”. Well, the closest you can get to those standards with a production panel is with SunPower.

Ask around, do some Google searches. You’ll learn quickly that SunPower is considered the best with very little debate. In fact, it’s by far the best. This American born company launched out of the US university research system (the founder was a Stanford professor) has sustained a 23 year run to be acquired recently by a global energy company.

At Solar Energy Services we’re excited to report that we are now a SunPower certified dealer. We’ve always wanted to offer the very best PV product and now we can. SES is proud to tie our 35 year commitment to the industry to the world leader in solar panel manufacturing.

Many are aware that the cost efficiency of installed solar has improved dramatically in the last 5 years due to efficiencies gained through price competition, distribution improvements, development of installation techniques, and other process improvements. However, the physical efficiency of solar cells has advanced more slowly than most have hoped. The standard Chinese panel being installed by the majority of installers today (especially the large leasing firms) are in the 14-15% efficiency range. A few solar manufacturers have been able to stay notably ahead of the pack. SunPower remains out front with their standard 327 W panel (E20) at 20% efficieny. Sunpower’s new “X” (E21) is 21% efficient! That’s right, over 40% more efficient than the average panel out there. The X begins to ship in April 2013 – next month.

SunPower’s Maxeon cells are the industry leader in reliability and durability also. They’ve had only180 defects out of 7 million panels. That’s right, 1 in 39000! The Maxeon cell has redundancy in contacts, accommodating wear from thermal expansion. It has backside contacts that provide increases collection on the sunny side. They are highly durable with the best impact resistance ratings. They are backed by a solid company with great support and a bright future.

To recap, the physical efficiency of solar cells has been relatively stagnant, with the exception of a few leaders that have developed slow and steady progress. SunPower has led the way. The company has been around for over 23 years. They have the most durable solar cell in the industry and the highest performing. I must confess, the 3 year old solar PV system on my roof has panels made in China. If I were installing today, there is no doubt I’d choose SunPower…

Residential Solar Panels ,Solar Service, Home Solar Panels
Written by Anonymous

DC Condos Use Solar Energy to Pre-Heat Hot Water

Residential Solar Panels ,Solar Service ,Home Solar PanelsWASHINGTON, DC:  Solar Energy Services, Inc., in partnership with third party solar developer Skyline Innovations, recently finished the installation of a solar water heating system for Shoreham North, a condominium building in downtown Washington, DC.

The solar thermal system includes 26 collectors southerly mounted on the roof, closed-loop plumbed to a 1,500 gallon solar storage tank inside the building.  The system is expected to reduce the building’s water heating utility bill by about 30%.

Commercial Solar Energy, Residential Solar Panels ,Solar Service
Written by Lisa Walsh

Going Solar? Top 10 Things to Consider…

SES gives the skinny on going sunny

  1. Commercial Solar Energy ,Residential Solar ,Panels Solar Service1. Cut your Energy Losses
    In most homes, heating and cooling accounts for the most energy usage. Regardless of where your energy is coming from; gas, coal, solar, electric, wind, etc. a homeowner’s first consideration is to reduce the loss of incoming energy:
    • Replace old windows and doors with Energy Star products. This can reduce energy consumption by 7 – 15%.
    • Seal up any air leaks throughout the house, attic and basement.
    • Insulate! This blocks air loss in the winter and preserves cool air in the summer.
  2. Consider those Big Appliances
    Refrigerator:
    Keep the condenser coils clean. Keep refrigerator away from oven/washer/dryer and other heat producing appliances. Place with consideration to air circulation.
    Stove: Remember that gas is generally a more cost-effective choice than electric.
    Attic Fan: An excellent way of pushing hot air outside in the day, and drawing cool air at night.
  3. Need a new roof?
    If you think your roof may need repairing or replacing within the next 5 or so years –it may be worth replacing before the solar panels are installed. If you’re on the fence about replacing your roof prematurely, remember that installers such as SES do provide a Remove and Reinstall service where, for a reasonable fee, the panels will be safely removed then re-installed after re-roofing.
  4. Small Bite or Full Monty?
    Just about every solar energy company sells and installs Solar Electric (Photovoltaic) systems. However, solar water heaters are an entirely different type of solar panel and not every solar company installs them. Thus, not every solar company is likely to tout the cost-effectiveness of this mature technology. Solar water heaters require only a fraction of the roof space (and often a third of the cost) that a solar PV system requires. For a family of four, currently using electric to heat their home’s water – solar water heating may provide the biggest bang for your solar buck, providing around 75% of a home’s annual hot water. However, a family of two heating their water with gas may consider investing in a solar electric (PV) system sized for their usage. Insofar as solar electric (PV), many homeowners cover 60 – 100% of their electrical needs from solar. Some choose to offset as little as 25% and opt to add panels as their budget allows.
  5. READ your Energy Bill
    For electricity, your energy bill should tell you how many kilowatt hours you use per year. This is an important number as you generally do not want to install a system that will exceed your annual consumption. Experienced installers can help you assess this, but a good rule of thumb is to divide that number by 1200kwH and that will tell you the approximate max sized PV system you should consider. That will be represented in kW – probably something like 8 to 10 kW if you are an average consumer. If you heat your water with electric, then solar water heating should absolutely be considered first.
  6. Best way to pay for your solar system
    The beauty of an increased popularity in solar is that there are a number of ways a homeowner can finance their project. Without question, whether immediately or over time, Solar Power is far cheaper than your Utility bill.

Payment plans range from No-Money-Down leasing options to initial investments ranging from $2000 – $50,000 depending on your energy usage and type of solar system. Thanks to current financial incentives, many Marylanders receive over 50% of their upfront investment back the first year. Some of our customers have transferred funds from low yield CDs and even borrowed from 401ks in order to fund their higher-return solar investment. Other homeowners have no interest in ROI’s and fund-juggling and simply want a lowered electric bill/carbon footprint. Thankfully there is a wide variety of financing options available.

  • Know YOUR solar energy tax credits, grants and incentives
    Any solar salesperson worth his/her salt will visit your home with full knowledge of the available financial incentives for your state and county. For example, an Anne Arundel County resident has the good fortune of FOUR different financial incentives (for both PV AND solar water heating) that combine to offer a huge discount on their system. Acclimating yourself to current incentives for your county will help the sales process be much more informative for you. Every solar homeowner is eligible for a 30% Federal Tax Credit. Then SRECs (solar renewable energy credits), state grants, county tax credits differ across the region.
  • Solar Panel Placement
    Whether solar water heating or solar electric (PV), a south facing shade-free roof provides optimum conditions for solar panel placement. However, any shade-free roof – including East and West orientations provide excellent rooftops for solar panels. The number of panels installed depends upon system size, roof space and budget. Homeowners with a good amount of spare land may also consider ground-mounted systems, some of which offer solar tracking options where panels are mounted to motorized pole that literally follow the sun, improving solar efficiency by 40 – 45%.
  • How many solar panels on the roof?
    Insofar as solar water heating, a shade-free area of 64 square feet is typical to house two 4′ x 8′ solar thermal panels (sized to provide a family of four with around 75% of their annual hot water load). Most solar electric (PV) panels measure 3′ 6″ x 5′ 6″. So, a roof that is 30′ wide by 14′ from gutter to ridge will fit two rows of 9 panels. An experienced solar designer will get precise roof measurements and ensure the panels are placed in the most space-efficient and visually appealing design.
  • Choosing a solar energy installer
    Of course, the author of this blog would like to gleefully exclaim, “Choose Solar Energy Services!”. However, most educated consumers know that the best way of finding the best fit for an installer comes from shopping around for the popular 3 proposals/estimates. There are a lot of solar installers our there in today’s market. Some considerations:

 

Time in the Business: This matters. Obviously the more systems a licensed installer has installed – the more experience they’ve gained – and the more they’ve refined their installation technique. Just as important, however, is the question of whether the installer will be around in 5, 10 or 15 yrs when perhaps the incentives for solar have declined. An older company is likely to have deeper roots in the industry regardless of current solar trends and incentives. You want your installer to be around for the life of your system, 25 – 35 yrs plus. This narrows the field considerably.

Service Department: Solar Water Heaters require a 3 – 5 yr simple service visit. Does the installer provide this service?

All Options on the Table: A company who offers both leasing AND upfront purchase will likely lay ALL your options out on the table. This also goes for installers who offer both solar water heating AND solar electric.

There should not be a charge associated with a site evaluation of your home for solar energy. This is a necessary part of the sales process and should take place before the cost estimate/proposal is presented.

Happy Solar Shopping!