Home Solar Panel ,Solar Service
Written by Rick Peters

Peters’ Journey to Net Zero

Solar Service,Home Solar PanelsWhat Net Zero Meant for Us? Our Severna Park based, four-person family was looking to offset some of our home’s dirty energy, but we really did not have an expectation we could offset it all, but we had to start somewhere. We took our first step shortly after I joined the solar industry in 2008.

Low Hanging Fruit. In February 2009, we installed a 120-square foot solar water heating system to offset most of our water heating, and a small portion of our space heating for the first floor of our home. We saw big savings from this 3-panel system right away. Ever since, I enjoy the act of turning off the back-up water heating in April and leaving it off until almost October. For us, offsetting a dirty and expensive oil-fired boiler was the obvious low hanging fruit. We would later convert that remaining load to natural gas when the utility extended the pipeline to our home.

Solar Electric (PV) With the rest of the heat, A/C, and appliances all running off electric, it was time to look at the next opportunity. A few years later, when budget allowed, we decided to add a 5 kW solar PV system to our second story roof which faces SSE. My best determination was that we offset just over 40% of our electric load with that PV system. We were happy, but knew we’d want to find a way to get to NetZero eventually. , . I began to evaluate the remaining rooftops and consider what it would take to get us there. Solar panel efficiencies had improved a lot over the past several years so this reduced the remaining roof space we’d need to hit our goal

Phase 2 (PV). In the spring of 2016 we finished filling the balance of the south roof with some slightly higher wattage panels. As part of the same expansion, we added 24 relatively high efficiency panels to the E/W, low slope, rooftop of our one-story garage. We now had a total of 6.6 kW Equivalent of solar thermal and 13.8 kW of PV.

Not There Yet….We almost tripled our PV with the last upgrade and according to my calculations, this would get us to NetZero electricity. We’d know for sure by April, the annual true-up time frame for netmetering with BGE. When April 2017 came around, we were disappointed to come up a bit short (unfortunately, with a couple teenagers in the house, my usage predictions were a little off). Where do we go from here? I was not ready to put panels on the north roof, there had to be something available to us on the demand side.

Oops – More Low Hanging Fruit…One thing about Energy Efficiency, there’s always more opportunity. I had changed out many bulbs to LED over the prior several years, mostly through attrition, but I had not replaced any of the more than 2 dozen canister lights we had throughout the ceiling upstairs and down. Not only were these lights very inefficient, but the heat they generated in the summer was just adding to our air-conditioning load. We found the LED replacements on sale and replaced them all, as well as the remaining few incandescent lights in the house.

Commercial Solar Energy,Solar ServiceEureka. we have arrived!… In April of 2018 we received a $46 check from BGE for the annual overage from solar. With the kids heading off to college soon and a new refrigerator around the corner, I’m confident our checks from BGE will be getting bigger for the near future. At least until we purchase an electric car…

Solar Service ,Home Solar Panels
Written by Lisa Walsh

DC Property Owners: Big Hot Water load = Big Solar Incentives

Commercial Solar Service, Annapolis MD

A growing number of building owners, developers and condo associations in the District of Columbia have come to realize that their building happens to be located in the most solar-friendly city in the USA .  Solar contractors, investors and financing vehicles are falling over each other to get solar panels on District roofs and start generating  the lucrative solar renewable energy credits (SRECs).   Whether via Direct Purchase, or $0 solar leases – SRECs are undoubtedly the reason for the solar season in DC (more to follow on those below).

However, before you sign on the dotted line and fill your roof with a 25-year solar PV (electric) system, as offered by 9 out of 10 solar professionals, make sure that you’re not losing the opportunity to vastly increase your return on investment with a Solar Thermal System.

Solar Water Heating Feasibility

The pre-qualification for a Solar Thermal System involves three questions:

  1. Does your building have a substantial, daily (365 day) hot water need? (i.e. apartment building/condos, restaurant, laundry, brewery, health center)
  2. Does your building have a centralized water heating system (as opposed to individual units throughout the building)?
  3. Can the building accommodate additional storage tanks?

If you answered YES to these three questions you really (really) should first consider a Solar Water Heating system either before – or at a minimum – in tandem with, a solar PV system.  (Shopper Beware – unless your solar contact has experience with solar thermal – which many do not – you’re going to have to be prepared to shop further).

What is Solar Water Heating (or Solar Thermal)?

Other than using the sun for energy generation, Solar Water Heating Systems operate entirely differently from their electron-shaking PV counterparts.  These time-tested, technologically mature systems are mechanical in nature and relatively simple.

Moreover, a solar thermal panel is 60 – 70% efficient; whereas a solar PV (electric) panel is typically 17 – 24% efficient.  Therefore, solar thermal panels generate substantially more energy per square foot than PV panels,  monetizing many more SRECs.

Solar Service , Home Solar Panels, Solar Renewable Energy

 

Let’s Review SRECs…

SRECs (Solar Renewable Energy Credits) – along with the 30% Federal Tax Credit and 100% Year 1 depreciation– are what drive the tremendous economic benefits of solar in Washington DC; one of several jurisdictions that have enacted a Renewable Portfolio Standard requiring that a specific percentage of electricity consumed must come from solar.   Whether residential, commercial, or institutional, each time a solar system generates 1 Megawatt hour of energy – the solar system owner generates 1 SREC.  This SREC is then sold via aggregators to an SREC market where it is bought by competitive energy suppliers to allow them to meet their share of the compliance obligation, or else pay a legislated fine (Alternative Compliance Payment, or ACP) for every SREC they are short.  Washington DC currently generates the highest SREC values in the country, largely due to the fact that DC does not have the real estate to install large solar farms which can rapidly oversupply a market and drive down SREC prices.

How much are SRECs Worth?

Washington DC SRECs are currently trading at $395/SREC.  To provide a frame of reference, a 6000 sq ft rooftop in Washington DC outfitted with a 75kW solar PV (electric) system could generate around 90 SRECs/year (over $35,000/year).   Depending on variables such as system size, corporate tax rate and and project site attributes, this SREC income – combined with a 30% Federal Tax Credit and 100% Year 1 depreciation, typically result in IRR’s between 30% – 60% and a Simple payback of 3 – 5 years.    Assuming solar thermal is applicable, this same roof outfitted with a Solar Thermal System could fit a kWh equivalent of a 150kW+ system, generating 180 SRECs/year – and see an IRR of 50 – 80%, with a simple payback in the 1 – 2 year range.

Solar Service ,Home Solar Panels, Residential Solar PanelsMaintenance

Although Solar PV (electric) clients often opt for an O & M (operations and maintenance) contract through their solar installer, Solar PV Systems  have relatively minor maintenance needs; usually an annual inspection along with ongoing monitoring.    Solar thermal (water heating) requires a little more maintenance including a 3 – 5 yearly service which, at a minimum, includes a replacement of the propylene glycol/energy transfer fluid that can degrade with time.  Nonetheless, the impact of service costs on the overall IRR is relatively small and easily absorbed by the increased SREC income.

Written by Lisa Walsh

Supercharge your Solar Water Heater

Solar Thermal not Solar PV: When talking about solar and space heating, it’s worth mentioning that the panels used for this type of solar application are not the same panels that power a house, a light, or any other electrically powered appliance. In fact, the only similarity between a PV (photovoltaic/electric) solar panel and a Thermal Solar Panel is that they both absorb solar energy. However, how each panels processes and distributes that energy is entirely different.

Enlarged Domestic Hot Water System: In order to make a solar space heating system cost-effective, most space heating systems are designed to include the home’s domestic hot water supply – thereby offsetting the gas/oil/electric bill and returning the solar system’s investment. Therefore, any space heating system is basically an enlarged solar water heating system. These systems that combine solar water heating and space heating are often referred to as combisystems. This combination is achieved with a solar storage tank that comes equipped with two separate heat exchangers; one for the domestic hot water loop and one for the space heating loop. The cooler water returning from the heating system passes through the upper heat exchanger on it’s way back to the boiler where it does one of two things: It picks up some heat that was generated by the solar system or, if the tank is cooler than the returning water, acts as a buffer tank allowing the boiler to have fewer on / off cycles thereby making it more efficient.

Space Heating Infrastructure: Radiant floor heating systems are highly compatible with solar thermal energy. This is mainly because these systems are designed to operate at low temperatures and thus the solar system can contribute energy more of the time. Hot water baseboards, radiators and other hydronic heaters can also benefit, especially if an outdoor reset control is installed. The outdoor reset control adjusts the boiler’s target temperature according to the outdoor temperature.
Forced air systems can also be modified to accommodate solar by placing a fan coil inside the existing duct work. A controller senses when the fan needs to be activated and, again, a conventional back up system kicks on as needed.

Heat Dissipation in the Summer: Of course here in Maryland/Washington DC,  in our Mid-Atlantic climate, solar energy for space heating is being summoned at a time of year when insolation (sunshine) levels are much lower than the rest of the year. Therefore more solar panels are required to meet the quota. A family of four would realistically need two, 4′ x 8′ flat plate collectors for their home’s hot water supply. Depending on the required space heating square footage, this collector size may be increased anywhere between 30 – 100%. To avoid overheating in the summertime when space heating is no longer required, there needs to be a mechanism to dispose of the excess heat. This can usually be achieved with anti-stagnation functions on the controller or by installing a heat dissipater on the roof. An ideal situation is to redirect this excess heat to a pool or hot tub, thereby creating a year round triple-application system that provides the largest return on investment.

Commercial Solar Energy Residential Solar Panels
Written by Rick Peters

SRECs in Maryland and DC

What Does the Future Hold?

Commercial Solar Energy, Residential Solar PanelsSolar Renewable Energy Credits (SRECs) have played a large part in the financing of solar energy systems in Maryland since the RPS (Renewable Portfolio Standard) was enacted in 2005. These market-based, tradable credits are the property of the solar system owner to resell, typically to brokers who bundle them for final resale to competitive energy suppliers in the interest of meeting their solar compliance goals. In Maryland (as well as Washington DC), these credits are generated by both solar electric (PV) and solar water heating systems.

The price of SRECs is supposed to reflect the over or under supply of these credits in the marketplace. Both Maryland and DC have very aggressive solar goals (2% by 2020 in MD and 2.5% by 2023 in DC) with steep adoption curves so we need lots of SRECs to meet compliance.

Maryland:

That said, the solar industry boomed for several years recently and we are currently going into an oversupply phase in Maryland. This has the effect of pushing down prices on SRECs in the near term.   There are many contributors to the oversupply and the industry and legislators are frequently working hard to promote policies that help to smooth out the supply, but in the end, SRECs are a market mechanism that is subject to “animal spirits.”

As solar prices decline it is fitting that SREC prices are declining too – after all, we should need less incentives as solar costs come down to “grid parity.” When Maryland’s SREC market was conceived, the designers planned for a declining value as more solar got on to the grid. In fact, the Alternative Compliance Payment (ACP) schedule – the amount energy suppliers have to pay if they cannot buy SRECs – is designed to decrease over time. The ACP is considered to be the maximum that an SREC would cost in a rational market. Recently SRECs have traded on the order of 35% of the ACP, but as high as 75% a few years ago. In Maryland, the ACP is scheduled to drop from $400 to $350 in 2015 and then down to $200 in 2017, $150 in 2019, and so on.

DC

Washington DC is a different market and one that is much better insulated from the shocks of large utility scale systems that flood SRECs onto the market. The sheer geography in DC does not lend itself to 10 MW solar farms and thus the SREC supply curve is a little smoother due to the requirement being fulfilled primarily with many smaller systems. As a result, DC SRECs have shown more consistency and maintained a higher price, benefitting system owners and prospective system owners.

What now?

Regardless of the trends for solar return on investment (ROI), we all want to maximize our incentives for our own benefit. SRECs are no different. While there are many more new solar customers every day, there are also many solar system owners now approaching the end of 3 or 5 year SREC contracts (aka “strips”) and they too need to decide how to proceed going forward. Do I want to sign up for another strip (3 or 5 year term contract) and accept a large discount on my SREC price for that price security or do I want to maybe float with the market for a while? I’ve got no crystal ball, but I do know that there are many efforts underway in Maryland, some legislative and some not, to help to smooth the SREC supply and thus maintain a reasonable value for SRECs to continue to help incentivize solar. For that reason, I believe we will see some recovery of SREC prices in Maryland in the next year or two and thus maybe it is better to hold off on a term contract. In DC, I would personally opt for more surety and take a term contract with the discount price, but that is my risk averse nature. Others might like to bear more risk and float in hopes of higher SREC values in the future.

Either way, we are lucky to have these incentives in Maryland and DC. They are working to increase solar installations and jobs and they are also helping to drive down the installed price of solar in our region.

ommercial Solar Energy, Residential Solar Panels ,Solar Service
Written by Anonymous

Hagerstown Correctional Facility Installs Solar Water Heating Systems

Commercial Solar Energy ,Residential Solar ,Panels Solar ServiceHAGERSTOWN, MD:  Earlier this week Solar Energy Services, Inc., a Maryland based solar installer, completed installation of five separate solar water heating systems at the Hagerstown Correctional Facility.

SES was engaged by Johnson Controls, Inc. to design, install and commission the solar systems in order to offset a larger portion of the facility’s traditional heating system.  Four of the systems, each consisting of 6 solar thermal panels closed-loop plumbed to 220 gallon solar storage tanks, were installed on four housing buildings.  The larger 12 panel system and accompanying tanks were installed on the facility’s dining hall.

Commercial Solar Energy, Solar Energy Services
Written by Anonymous

Assisted Living Complex Installs Solar Water Heater

Commercial Solar Energy, Solar Energy ServicesGLEN BURNIE, MD:  Glen Square, a senior assisted-living complex in the heart of Glen Burnie, MD now have a solar water heating system that will offset a large portion of their natural gas water heating system.

The solar system is financed by Skyline Innovations, Inc., a Washington, DC based third party solar developer, who engaged Solar Energy Services of Millersville, MD to design and install the 42 panel solar thermal system.

solar services, installation, Commercial Solar Energy, Residential Solar Panels
Written by Anonymous

Capital Manor Housing Cooperative Goes Solar Thermal

solar energy, Solar Service,installationWASHINGTON, DC:  Earlier this week Solar Energy Services, Inc. completed the installation of a solar water heating system on Capital Manor Cooperative’s residence building on the 1400 block of W Street in Northwest Washington, DC.

SES was engaged by third party solar developer, Skyline Innovations, earlier this year to design and install the solar water heating system consisting of 48 evacuted tube solar arrays and three, 1,500 gallon solar storage tanks.

Commercial Solar Service,Residential Solar Panels
Written by Anonymous

Commercial Solar Water Heating on the Rise

Residential Solar Panels,Commercial Solar ServiceWhile still a relatively well kept secret among the general public, large scale solar water heating is popping up in more and more places. While this technology is relatively mature, the practical deployment is still in its infancy.

While we’ve seen lots of growth in recent years, what is holding back solar water heating? Three things actually: Awareness, Cheap natural gas, and Inertia.

We’re overcoming the awareness challenge slowly but surely. Every week there is another article in the trade press about a prison, dormitory, military barracks, restaurant or health care facility adopting this valuable technology. These systems are piquing the interest of facilities managers, engineers, and architects on the demand side and mechanical contractors and manufacturers on the supply side; helping to raise awareness among the traditional commercial water heating business community. This is particularly the case in markets like Washington DC, Maryland, North Carolina, Nevada, and California where solar water heating systems benefit from the existing solar PV incentive markets.

Cheap natural gas. I’ve written on this before, but it’s worth repeating. Today’s wholesale natural gas prices are close to a ten year low, and more than 75% below their most recent peak in July of 2008. Recent data indicates that prices are trending up again, but the current low price combined with economic uncertainty has facility managers and CFOs hesitating until they can see a faster payback on a solar water heating investment. While a 4 year payback may not seem enticing in today’s economy, the problem with waiting for the inevitable price increase of natural gas is that you forgo some of the best incentives existing today that will surely be lower or absent in the future. Remember, the solar fuel is free in the future, so increasing gas prices will only improve the economic return in the future.

Inertia is one of the most powerful social forces I know. It plays a huge role here. As engineers and architects continue to gain experience and confidence in specifying SWH systems, volume will continue to drive down costs in much the same way that we have seen with solar PV. The federal government has required the use of SWH on all of their new construction, if feasible. The number of contractors who are capable of installing and servicing these systems continues to increase, giving prospective system owners’ confidence that the systems will not be supported in the future.

Below are a few links highlighting some commercial systems recently commissioned in the U.S. Read on and learn how commonplace this simple technology is becoming.

Written by Anonymous

Annapolis, MD: Housing Authority Installs Solar Water Heating System

AGING PUBLIC HOUSING BUILDINGS IN ANNAPOLIS GET NEW SOLAR PANELS

At one of Annapolis’ public housing buildings last week, new solar panels on the roof collected energy to heat hot water for more than two dozen apartments below.

Written by Anonymous

Annapolis, MD: Housing Authority Installs Solar Water Heating System

by Erin Cox:  The Baltimore Sun

At one of Annapolis’ public housing buildings last week, new solar panels on the roof collected energy to heat hot water for more than two dozen apartments below.

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