If you want to have backup power when the utility grid power fails, then this type of system is for you. It combines the best attributes of a grid tied system and an off grid system. This combination allows a grid tied with battery backup system to send excess energy to the utility grid as a credit to your monthly utility bill while also constantly being in backup mode, sending power to the battery you use for backup. This type of solar energy system is always ready for the moment that the utility fails. If your neighbors’ power goes out, your solar installation will switch the loads from a grid to a battery energy source and keep providing power to your home or business. This switch from utility to battery takes only a few milliseconds, so you probably will not even notice that the grid has failed.This type of system is needed if your local utility company power supply is uncertain, if you have special needs such as electric powered home health equipment, or if you rely on refrigeration or electric-powered farm equipment in your business. This type of system is much more complicated than a simple grid tied system. There are many added components and quite a bit more design work that needs to be done to guarantee that the system size meets your needs. Richter Solar Energy will make a site visit and determine the specific needs of your family or business:
How many loads need to be backed up — that is, what electrical appliances or other power usage do you need to cover?
How many hours a day will you need to operate these loads?
How many days would you want the system to power these loads in the event of a power failure?
With this information we can design the inverter size to adequately handle the surge loads imposed upon it, and design the battery bank capacity to carry these loads through extended periods of no sunlight or grid connection. This style of system is more expensive than a simple grid tied system because of the added system complexity and storage batteries — but the satisfaction of having backup power when the utility fails can be priceless at times.