SOLARIS Solar Powered Battery Storage For Electric Vehicles

E-STATION SOLARIS Solar Powered Battery Storage For Electric Vehicles. 1 E-STATION SOLARIS OVERVIEW • The E-Station Solaris is a battery storage ...
Author: Eugene Holt
12 downloads 0 Views 1MB Size
E-STATION

SOLARIS

Solar Powered Battery Storage For Electric Vehicles.

1

E-STATION SOLARIS OVERVIEW • The E-Station Solaris is a battery storage solution consisting of a lithium ion battery pack with an integrated battery management system, a DC/AC inverter and switching modules. Customers can also opt for a wall mounted electric vehicle charging station. • The Solaris is primarily designed to store excess energy generated by solar panels during the day for use at night. It is the ideal solution in situations where a feed in tariff is negligible or not available. The recharge/discharge cycle varies depending on the power requirements of the building during the day. The solar array must be sized so that the batteries get an opportunity to re-charge during the day. • The system is available in various battery sizes ranging from 10 kWh upwards. • The Solaris is not grid tied and does not export power to the utility grid.

1

DESIGN • The solar array is connected to the battery pack via a DC circuit. The battery pack is connected to an DC/AC inverter via a DC circuit. The inverter is connected to the building via an AC circuit. The building draws power from the inverter day and night unless the state of charge in the battery drops to the reserve in which case the building power is automatically switched to the external grid. • The solar array is sized so that the energy produced by the solar array during the day is sufficient to recharge the batteries while at the same time providing power to the building. • The batteries start recharging when the solar array becomes active in the morning. The rate of charge is dependent on the discharge rate of the battery which is dependent on the amount of power required by the building during the day. • The building draws power from the batteries through the inverter all day. The BMS maintains the battery’s state of charge as the battery charges and discharges simultaneously. The solar array is essentially supplying current through the battery into the inverter.

• The customer installs a Solaris battery storage system with an energy storage capacity of 10 kWh and an inverter that can supply up to 10 kW of power continously. • The solar panels become active in the morning and start to generate power at a rate of 5 kW. The battery pack is at reserve and starts to recharge. The recharging battery will draw a maximum of 3 kW. • There is a burst of household activity in the morning and the building draws 5 kW through the inverter. The battery maintains it’s state of change as the solar array supplies 5 kW through the batteries into the building. • Eventually the occupants leave for work and school and the energy requirement of the bulding drops to one 1 kW. The batteries recharge until fully charged. • The occupants return home in the evening. The building draws 3 kW through the inverter. The batteries start to discharge. One of the occupants arrives home and plugs in a BMW i3 electric car. The BMW i3 draws 7 kW. The inverter draws 10 kW from the battery pack. The battery pack begins to discharge until it reaches the reserve. The BMS signals the inverter to cut back to the grid.

• The batteries start to discharge in the evening as the power generated by the solar array wanes. The building continues to draw power from the batteries until the batteries reach the reserve at which point the BMS signals the inverter to cut back to the external grid.

• The building draws power from the external grid until such time as the solar panels become operational in the morning.

• The building draws from the external grid when the batteries reach the reserve.

• The Solaris is appropriate for buildings with solar panels that generate excess energy during the day in circumstances where there are no rebates for energy exported to the grid. Solar panels installed on buildings which are empty during the day provide little or no benefit to the owner or occupier as the power generated by the solar panels is unused or exported to the grid with no financial benefit.

ISLANDING • The inverter does not push power out to the external grid so anti-islanding is not required.

FAILOVER • The Solaris will fail over to the external grid in the event of a solar array failure, battery failure or inverter failure.

BACKUP POWER SUPPLY • The Solaris can act as a backup power supply in the event of a grid failure.

SCENARIO

NO ENERGY EXPORT REBATES

ELECTRIC CAR OWNERS SECTION • The Solaris is particularly appropriate for electric car owners who wish to charge their vehicles in the evening from solar power generated during the day. An electric car uses on average 1 kWh of power per 5 km of travel at freeway speeds. An electric car owner who travels 50 km per day uses 10 kWh of power. • An electric car owner who wishes to re-charge an electric car entirely from the battery needs a pack that is sized to re-charge the car and provide power to the house overnight. Otherwise an electric car which starts charging in the evening will quickly deplete the battery pack and the building will cut back to the grid.

• The customer has a 5 kW solar array which on an average day produces 20 kWh of energy. The building consumes 18 kWh of energy over a 24 hour period, 8 kWh during daylight hours and 10 kWh at night. 2

SURGE PRICING • The Solaris will help reduce exposure to surge pricing in the event that electricity retailers start charging a premium for power consumed between 16:00 and 19:00 as the Solaris will power the building during this period.

BATTERY BACKUP • The Solaris can power the house in the event of an external grid failure until the battery becomes depleted.

BATTERY SPECIFICATIONS • Cabinet dimensions: W 50cm L 55cm H 72cm

• Lifespan: Expected lifespan 10 years

• Cabinet Weight 75 Kg

• Battery warranty 2 years

• LiFePO4 chemistry

• Operating temperature range: -45ºC to +85ºC

• Capacity: 10 kWh, 8 kWh usable

• Continuous discharge rate: 10 kW

• Voltage: 180 Volts

• Maximum discharge rate: 30 kW

• Cells: 60 amp hour • Charge cycles: 5000 at 80% depth of discharge

INVERTER SPECIFICATIONS Cabinet dimensions: W 54cm L 54cm H 76cm Weight: 110 Kg

Low frequency transformer Output waveform: Pure Sine Wave DC Input: Rated to 240 V and 42 Amps AC Output: • Rated output power: 10 kW • Overload ability: 15kW for five minutes • Rated Voltage: Configurable to 110/ 120/220/230/240/380/400/415 VAC • Rated Current: 45.5A single phase and 60A three phase • Phases: Optional single phase or four wire three phase @ 15 amps a phase • Power Factor: 0.95 • Efficiency: > 93% • Frequency: 50Hz • Waveform distortion rate (THD):

Suggest Documents