Most renewable energy systems are grid-tied systems, meaning that they do not include batteries. These systems are the most cost effective, reliable, and simple alternative energy systems available to the consumer. However, utility power must be present for them to function. Therefore, when there is a power outage, the inverter has to follow UL 1741 code and will shut down, which ultimately means the renewable energy system shuts down and will not produce power. UL 1741 says that the energy generating facility must shut down and isolate itself from the grid so power from the solar panel or wind power system does not back feed onto the utility grid potentially injuring the lineman working on the utility grid to restore power.
When you have a battery backup system, you will designate certain circuits and appliances to function when the grid power is lost. The renewable energy system will use the sunlight or cloudy ambient light to recharge the battery bank which is supplying power to the emergency load panel. The emergency load panel will consist of the circuits you want to run during a power outage.
The size of the battery bank (# of batteries) is determined by the emergency loads you want to run during a power outage and how many days you want to survive without sunshine to recharge the battery bank. In most cases, our customers will only want to run the very minimum loads to survive. The following loads are typically included in a grid tie battery backup system: well pump, sump pump, refrigerator, chest freezer, and a few lights & outlets. Running an AC unit or a furnace requires too much power resulting in a very large battery bank and thousands of dollars. The other item we sometimes consider is the hot water tank which depends on the customer’s budget and preference of emergency loads to run during a power outage.
At Ohio Power Solutions, we will professionally design a solar grid tied system with battery backup power for your home, business, or farm. We will need to know exactly what emergency loads you will want to run during a power outage and what the power requirements are for each of the loads that you wish to run.
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Lithium Ion Battery
The Tesla Power Wall and the Renusol 9.8 kWh LG Chem battery banks are an example of a Lithium Ion battery. Lithium Ion battery wall packs are becoming more & more popular for homeowners. Energy storage is on the rise in the USA
LG’s lithium ion RESU battery is a home energy storage solution that can be paired with a solar panel system. According to the company, the RESU can be used both to maximize consumption of solar energy at home, rather than sending it back to the grid, and also functions as a source of backup power in the event that the grid goes down. However, while the RESU has some backup power capabilities, it isn’t designed for off-grid use.
The LG RESU is an ideal pairing for solar panel systems, especially if your utility has reduced or no net metering, time-of-use rates, or demand charges. Installing a solar storage solution like the RESU allows you to maintain a sustained power supply during the day or night.
As with other home energy storage products, the LG Chem battery pack is sized for day-to-day use at your home, and is usually paired with a home solar panel system. When your solar panels produce more electricity than you can use in your home, the excess is stored in the battery pack instead of being sent back into the electric grid. Later, when your panels aren’t producing enough electricity, you can use the electricity stored in your LG solar battery instead of having to buy it from your utility. Normally, this process happens over the course of a day: when the sun is high in the sky and your solar panels are producing more electricity than you can use, the surplus energy is stored in your battery. As the sun goes down and your solar panel production decreases, you draw on the electricity that you stored during the sunniest part of the day. Essentially, home batteries like the one manufactured by LG help you balance out your electricity production and usage over the course of the day.