Solar at Distant Hill Gardens
“Be like the flower, turn your faces to the sun.” Kahlil Gibran
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At Distant Hill Gardens, we pride ourselves on working with Nature, not against her. There is no better way to build this relationship than to accept the energy that Nature offers us every sunny day. We are following the advice of Thomas Edison :
Our Passive Solar Home
We starting building our passive solar home in the summer of 1979. It went through a number of changes and renovations over the years, with the last major construction in 1995. The 1800 square foot home is heated each New Hampshire winter with the solar energy that enters through the 250 square feet of south facing glass, and two cord of wood. A conventional home, insulated to the same degree, would need double that amount of fuel for a heating season.
Our Solar Powered Furnace
The heart of the solar heating system of our home is the foot thick brick and concrete wall at the rear of the sixteen-foot long 'solar furnace' or sunspace. This large amount of concrete and brick adds the thermal mass needed for a passive solar home to function efficiently. The wall acts like a large radiator and the sunspace like a hot air furnace. The sun's rays coming through the sloped glass heat up the mass wall, and the stored warmth is radiated back out into the house at night. The sun also heats the air in the sunspace, which is moved automatically into the living space by a thermostatically controlled fan.
The sunspace also doubles as a solar clothes dryer (you can see two of our wooden clothes racks in the photo), and a greenhouse for starting vegetable transplants in the spring. But my favorite use of the sunspace comes when we hang up our hammock on a cold winter day. On a sunny 0℉ (-18℃) day, our 'solar furnace' will be 80℉ (26℃) or more!
Life is Good.
Our Solar Hot Water Heater
The solar hot water heating system was installed in the autumn of 2008. It consists of a ground mounted 8 tube Sunda Solar Seido-1 series evacuated tube solar hot water collector at a 60 degree angle, a pressurized closed loop antifreeze filled system, a pump station with a built in heat exchanger, a super insulated 50 gallon hot water storage tank, and a conventional 35 gallon electric hot water heater. We estimate it provides about 50% of our hot water needs.
We chose to install a solar hot water heater first, before a photovoltaic system, because it was much less expensive. It turned out we made the right decision. A large State on New Hampshire rebate became available in 2009 for PV systems, and along with federal income tax incentives, made it financially reasonable to proceed.
Our Photovoltaic System
In April of 2009, we installed a 3.15 kW photovoltaic system on the south facing roof of the house. The 14 SunPower Signature™ black solar panels supply about 75% of our yearly electric needs. The array is wired directly to the grid, using a payment system called
Net Metering. In a net metering program, the electric company allows a customer's meter to actually run backwards if the electricity the customer generates is more than they are consuming. At the end of the billing period, the customer only pays for their net consumption: the amount of electricity consumed, minus the amount of electricity generated.
We will be installing another 3 kW 12 panel photovoltaic array in September 2016 and plan to begin converting many of our gas powered equiptment to electric as they become available.
Other Solar Components
Energy Efficient Heating and Cooling
The inside wall fan unit for our Mitsubishi Mini-split heat pump.
The outdoor condenser unit for our Mitsubishi Mini-split heat pump.
Our Mitsubishi Mini-split heat pump is highly efficient and can be used for both heating and air conditioning.