If your business or home is considering solar but you absolutely can’t suffer an outage, a grid-tied solar system with a battery backup could be a great option for you. With a battery backup system, you’ll be able to run the essentials: lights, computers, refrigerator, television and even heating (depending on battery size).
You will also save more with a battery backup system. Your battery stores up energy during off-peak hours and puts it to use when electricity costs are high during peak hours. It works for you — even when it’s not an emergency. It’s like creating your own micro-grid.
We are often asked how the cost of adding a battery backup compares to non-battery options. Opting for battery backup can add about 30-60 percent to the overall cost of your solar project. This is primarily due to the cost of the battery and other necessary equipment.
The battery storage serves multiple purpose, firstly it provides backup power during power outage and blackouts. But more importantly, it allows customer to use their battery storage at peak rate hours and re-charge it from Grid when the Utilities rates are lower. This is very common solution for places where Utilities charge their customer tier rate and/or if there is a Solar export limit or if there is no net-metering option available. Battery system are little higher in cost due to additional cost of batteries as well as labor and complex design and safety code requirement.
The are two major type of battery storage system commonly refer as DC-couple and AC couple system. The DC couple systems are more efficient since these systems has less component and least amount of energy conversion from DC to AC and or AC to DC. These systems mostly installed outright as a new system. The most common, economical, and reliable system is SolarEdge system with LG chem Lithium Ion battery. It is very efficient, robust, and high-quality system since both companies, i.e. SolarEdge and LG have been making these system for decades.