The following image shows SunStation in operation on a bright October day! The load for the day was 12.4 kWh. This includes charging a Nissan Leaf and a Toyota Prius Plugin-in. The total power generated was 40.3 kWh and 21.4 kWh was sold to the grid. As you can see, the installation is much more than carbon neutral with regard to electrical power. It has a gas heating system so is not completely carbon neutral.
The orange line is the state of charge for the batteries. The 14.4 kWh of batteries is enough to keep the home running, charge the Prius fully and the Leaf partially, when the grid is down. The system automatically disconnects itself from the grid when there is an outage.
The house itself is fairly energy efficient with mostly LED lights and a few CFLs. The heating system is high efficiency with a 60 W fan that operates most of the time. The house is air-tight and has a whole house air exchange system that operates continuously. The refrigerator is 10 years old and the washer and dryer are less than 10 years old. As you can see, the typical load is 500 W except when the cars are charging. The efficiency could be further improved by installing a state-of-the-art central air system and replacing the refrigerator.
The Nissan Leaf is 100% electric. On a normal day the Prius operates on battery stored energy about 80% of the time. It visits the gas station once every 3 weeks or so.
Besides saving money on power, the system produces 7 Solar Renewable Energy Credits (SRECs) yearly. At current SREC prices, that is about $1500 a year in revenue. The homeowners own the system so all the revenue goes directly to them.
SunStation is in operation! The system produces a peak of 7.8 kW solar power. It has 14 kWh of lithium batteries. The SunStation electronics are shown below. The inverter is on the left. The batteries are in the cabinet on the right.
The SunStation has a web interface. You can see that when this screen shot was made the SunStation was selling 5.1 kW back to the power company! The batteries are fully charged. Usage was very small. The house has a whole house ventilator that is drawing most of the power. The homeowners also own a Nissan Leaf and a Toyota Prius Plugin. The solar array is enough to fully recharge those cars and run the house electrical devices when the air conditioning is not on.
Unlike gasoline, diesel or natural gas systems SunStation provides power year round! There is no noise and no toxic emissions. SunStation has no moving parts and is zero maintenance. Solar power systems are eligible for Solar Renewable Energy Credits which are cash payments for having an operating solar power system. It is estimated that this system will bring in $3700/year revenue between selling power and SRECs.
The first SunStation installation is done! This system includes 14 kWh of Valence lithium batteries and an Outback inverter. Unlike most other solar power systems, the solar panels will deliver power to the house with or without the grid active.
An existing 3.8 kW array was augmented with the new Panasonic solar panels on the right. They are about the same size as the older Sharp panels but much more efficient. In the bottom picture you can see the Outback inverter. The cabinet on the lower right houses the Valence batteries. The system will power the entire house in an outage with the exception of the central air conditioning system.
Unlike gasoline, diesel or natural gas systems this system provides power year round! There is no noise and no toxic emissions. SunStation has no moving parts and is zero maintenance. Solar power systems are eligible for Solar Renewable Energy Credits too which are cash payments for having an operating solar power system so you save money two ways.
Check out our SunStation page for more information!
On Saturday April 1, PSS participated in the Princeton Plasma Physics Lab Open House to show case our Direct Fusion Drive and our conceptual nine-month manned space mission to Mars in 2024! Our new fusion engine enables shorter transfer times and total mission durations, critical for interplanetary manned space flight. We had great interest in our human mission and many budding astronauts were ready to sign up for the trip.
Please see our educational page for some fun DFD material for your space enthusiast:
More information on this exciting project is available on our Fusion webpage:
Our SunStation products for Home Back-Up and EV Charging were also on display at the PPPL Open House. SunStation is a green way to provide emergency power to critical loads in your home during an electrical service interruption or to charge your electric vehicle without using any grid power!
Please join us at the Princeton Plasma Physics Laboratory from 9 am to 4 pm on June 1, 2013.
We will have exhibits on our Direct Fusion Drive, a collaborative project with PPPL to develop a nuclear fusion rocket engine for space propulsion, and on our SunStations for home electrical power backup and electric vehicle charging.
We received the batteries and BMS for Mike’s SunStation last week. They look great!!