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(PV) Photovoltaic Systems in Ireland (Solar Electric) 

There are 2 types of photovoltaic applications: those connected to an existing power grid (Grid-connection in Ireland the ESB isn't set up for this type of system, high time to make it available in Ireland), and those independent from any power grid (Stand alone most common in Ireland). 

DO NOT THINK ABOUT PV WITHOUT CONSIDERING ENERGY EFFICIENCY.

PV only makes sense when electricity is consumed efficiently. Energy efficiency is the key goal before considering any PV system, since it will have a direct impact upon the type and quantity of PV equipment needed.

(PV)  STAND ALONE SYSTEMS 

Stand alone systems are totally self-sufficient with no connection to main grid system. They generate electricity during daylight hours, and store excess for night time use. Provide for all electric needs. Require large battery bank for night and cloudy days. Consider a backup system, generator / inverter in case of system failure or spell of bad weather.

What will it do?

Stand alone systems provide power whenever the sun is shining, eliminating dependency on the ESB utility, provided electricity, and reducing ESB bills. Provide power for a variety of applications other than residential use. Can be used for pumping water from a well, outdoor lighting, etc. Care must be taken to correctly size and maintain the system. Amount of solar power available depends on array and inverter. back-up power and time depend on artery and inverter choices.

Stand alone components

PV panels – The part of the system that converts sunlight to electricity
Stand alone inverter – The part of the system that changes the quality of the electricity the panel produces (DC Direct Current) to the quality required by the building equipment. (220 volt alternating current)
Batteries – The electricity storage system
Battery cut off switch – Safety item to isolate the battery bank
Inverter safety switch – So the utility can shut system off in emergencies or work

Applications for PV systems: 

Water pumping, Pool pumps, Ventilation, Irrigation control, lighting, DC powered appliances and many more.

How to choose a photovoltaic (PV) system:

Choosing a system:

System choice is based on what do you need it to do? How much power do you want? What is the daily & annual profile of power use and projected need? What happens if the power system fails?

First steps:

Consider an energy audit, insulation, effective windows, blinds, controlled ventilation, heat-recovery, roof exposure and impacts and last but not least efficient appliances. You should also consider time of use night rate power, site conditions, architecture and construction. Use passive solar techniques to mitigate negative conditions and take advantage of site resources to reduce power requirements.