Residential PV electric systems fall under one of two major categories, solar electrical systems that interact with the utility power grid and do not have any battery backup; or solar energy systems that both interact with the utility power and have battery backup capabilities.
On-Grid solar power system with no battery backup operates only when the utility is available. This type of system provides the largest amount of money saved from utility usage and this is due to the fact that utility outage is pretty rare. In any event of utility outage this type of system is shut down and not providing electricity. Typical solar electrical system without battery will contain the following components: Solar panels (PV array), mounting systems, wiring systems, DC-AC inverter, system performance metering and utility switch.
On-Grid solar power system with Battery backup stores some of the electricity harnessed by the PV solar panels in a battery or batteries. The battery is connected to defined circuits in the house and supply electric power to these critical circuits when event of utility outage occurs. Common backup battery system has a storage capacity of 8 kW. The average usage for home (not including air condition) is at a rate of 1 kWh, so it means that a typical battery can supply electric power for about 8 hours. Typical solar electrical system with battery will contain the following components: Solar panels (PV array), mounting systems, wiring systems, battery, battery charge controller, DC-AC inverter, sub-panel for critical load circuits, system performance metering and utility switch.
When coming to decide what type of system will suit your needs best, with or without a battery, you should consider the following factors and prioritise them:
Now, that you know what elements are more important for you it is much easier to choose the residential electric power system that covers best your needs. Make sure you are familiar with the home solar panels kit components
- Monthly electricity bill reduction.
- Backup power
- Budget constraints
- Environment friendly