This is the most exciting proposals to ever hit the renewable energy market. It offers the opportunity to be in complete control of your energy costs and earn an income for the generation. It uses a wind turbine and or battery storage system to supply power to the property when the wind is not blowing. The excess power is used to create Hydrogen, which is then used as vehicle fuel or fuel for the central heating. The system also allows you to export a predetermined amount of electricity to the Grid. This means that you do not have to pay for any upgrades to the local network and still have the ability to use the Grid if you need extra power.
The system is tailor made to perfectly fit your requirements as to the amount of power required and the amount of time that the wind might not blow.
Off grid side
The turbine will be used to provide power via its standard inverter setup as if it were grid tied but will be off an island systems synthetic grid.
Island inverter system
Island Inverter System
A specific island inverter charger system will be used for this system. An example of which would be a Voltlogic Inverter Charger. This is a completely new and unique inverter that can balance phases as well as run the system.
The Island system will be able to provide a 50Hz grid for the turbine which is completely isolated from the Grid.
The Island system is capable of power being harvested from the turbine to charge batteries. The Island system will be able to take any available power due to voltage rise on the synthetic grid and place it into a battery bank.
The Island System will have a charger built in to only take power from the grid connection to charge batteries but not to export through this specific connection.
The battery storage will cater for the site demand requirements with switch over backup from the electricity grid if long periods of low wind
The on-site charging requirements will vary depending on the size of off-grid system proposed. This will be determined on a site basis and submitted accordingly to the DNO (District Network Operator).
EMMA Power and Heat Control
The EMMA controller will siphon power to produce hydrogen gas and heat a buffer tank for hot water heating and central heating as well as provide up power to a 3.6kW inverter. This will be done with respect to charge level in the batteries.
When the battery voltage is low the EMMA will send less power to grid and or heat and more power to battery charger system.
When batteries are nearing full charge the EMMA system will divert more power to hydrogen production.
Export current is inversely related to battery voltage. (Export current is classed as the current that is allowed to be sent to the Inverter charger system)
When batteries are charged to a pre-set level, up to 6kW of energy will be diverted via solid state relays to an electrolyser for the production and storage of hydrogen gas, at the maximum rate of 2.1Kg per 24 hour period. The gas will be used during times of demand for indirect heating via a hydrogen burner, of water within the buffer tank. This system is modular and so if you require more Hydrogen, then a large electrolyser or multiple electrolysers would be used.
The heating system will be retrofitted to the existing heating system.
A buffer tank will be sized taking account of the heating requirements of the house and the estimated daily output of the turbine less the electrical demands.
The buffer tank will be connected via a motorised control valve so it is only used when enough hot water is available to do the heating.
The existing heating system will be used as a backup when there is not enough power from the wind.
The motorised valve will be controlled by the temperature of the buffer tank
Hot Water Heating
The renewable heating buffer tank that supplies the boiler circuit will heat the hot water in the same way the existing boiler system did, most likely by means of a motorised switchover valve.
This will be temperature controlled and or timer controlled.
Each site will have different energy requirements. The requirements will be matched or offset to some extent with a suitably size Wind Turbine. As the turbine production varies the following have been considered:
A battery bank is in place to harness some of the power to offset electrical requirements.
A G83 type tested inverter to the -2 requirements for grid export.
Hydrogen production and storage is provided to provide non carbon heating of water.
A heat store is also used as this is a large energy requirement on most windy sites and is a significant energy requirement on farms where this system is the target install.
The EMMA system has the ability to stop the turbine when all energy needs are met.
All the above requirements are governed by the EMMA system.
On grid Domestic Hot water heating suggestions
If an immersion is present in the hot water tank, intelligent hot water heating can be applied.
The Hot water heating can be heated by the following means:
High Grid voltage can trigger the system to commence heating due to surplus power available on the grid.
Timer control can allow for the immersion to come on during specified times.
Zesto Nero Control can allow the tank to just heat the exact amount of water for the exact time it is required reducing grid intake significantly.