Installing a solar panel with battery backup requires some different components than traditional systems. Here may be a quick rundown of the components involved in grid-tied PV solar storage system with batteries.
A hybrid inverter (also named as a bidirectional or battery-based inverter) is usually a string inverter which will operate bidirectionally. this implies it can take DC from the array or the battery, supply AC to the grid or critical load panel, and charge from the PV or the grid. A hybrid inverter can isolate the system from the grid when the grid is down so the system can still provide power to critical loads without feeding it into the grid. In contrast, when systems with traditional string inverters disconnect when the grid is down, no solar energy is in a position to be generated or used.
The job of an inverter mainly consists of checking if the grid is online and if the energy is being generated from solar panels, then converting powering and sending it to the appliances. However, hybrid inverters ought to be pretty smart, taking an intelligent approach to power management. this is often especially important due to changing time-of-use rates which affect the price of electricity at different times. The inverter must determine where the power is coming from and what critical load is required to manage power from the batteries, array and grid to urge the most effective electricity savings and financial return possible for the system owner.
Battery Management System
A battery management system (BMS) helps control parameters like battery temperature, depth of discharge and state of charge therefore the batteries aren’t over or under charged, which may affect their life. A BMS is typically a software function internal to a charge controller or more sophisticated charging device.
A BMS is critical when using lithium-ion batteries because there’s more risk for thermal issues with this chemistry. When using other batteries, like lead acid, a BMS are often included but isn’t critical because there’s less risk of thermal issues and therefore the inverter or charge controller can usually handle charging regimes.
Choosing the proper battery for a system is important for optimizing project life and performance, and minimizing maintenance costs and downtime or failure. There are different types of batteries, and makers within each type make their products differently.
Exploring the various varieties of batteries and asking your manufacturer or distributor the proper questions can assist you decide which chemistry and manufacturer is correct for you. You’ll also want be sure you size the battery properly to the array and give proper O&M for the simplest performance and battery life.