It depends on your monthly electricity bill. Normally, if your monthly electricity bill over $300/month, the solar system is absolutely worth. Also, you have EV or have a plan to have a EV, the gasoline expense will shift to electricity bill, which can drive your electricity bill obviously surge. Solar system is the best solutions for it. With many states transitioning to policies like NEM 3.0 in California, traditional net metering (selling power back to the grid for full credit) is no longer profitable. Today, solar is absolutely worth it if paired with a battery storage system. By storing your excess daytime generation and using it during expensive peak hours (Time-of-Use rates), you can maximize your ROI and gain energy independence.

Yes. Adding Battery Storage to Your Existing Solar System

If you already have a grid-tie solar system without battery storage, we can upgrade it using one of two methods based on your current inverter's model and specifications:

1. DC-Coupled Battery Upgrade
This applies to systems already using a hybrid inverter. Our goal is to find a battery system that is fully compatible with your current setup:

• High-Voltage Hybrid Inverters: (e.g., Growatt MIN series, Solis S6 series). These require a high-voltage battery system that carries a certified UL 9540 system listing and has been officially tested for compatibility.
• 48V Low-Voltage Hybrid Inverters: These can typically be paired with standard 48V low-voltage batteries, utilizing universal RS485 communication between the battery and the inverter.

2. AC-Coupled Battery Upgrade
This applies if your existing system uses a standard grid-tie inverter with no backup capabilities. To enable backup power, we install a complete storage suite consisting of a Hybrid Inverter, Storage Battery, and Smart Gateway/Controller. Your existing grid-tie inverter will then be integrated via AC-coupling through the smart gateway.
Common grid-tie inverters that use this AC-coupled upgrade path include:

• SolarEdge SE Series Grid-Tie Inverters
• Solis S5 Series
• Enphase IQ7 / IQ8 Microinverters
• Hoymiles HM / HMS Series miMicroinverters

Not sure about your inverter's model or specifications? The Self2solar Team is here to help! Feel free to reach out anytime at: PrimeService@Self2solar.com

The required capacity of a standard residential battery storage system typically depends on your daily power consumption and the size of your rooftop solar array. For instance, if you have a 10 kW PV system, assuming an industry-average of 6.5 peak sun hours per day, the system can generate approximately 65 kWh of electricity daily.

During the day, high-power household loads—such as pool pumps, refrigerators, air conditioning or heat pumps, and EV chargers—will consume at least 50% of this solar generation. The remaining 50% is stored in the battery system. Therefore, a 10 kW PV system is typically paired with a 20 to 30 kWh energy storage system.

Modern energy storage systems feature a modular, stacked design that offers plug-and-play installation and flexible scalability. Industry-leading options like the Sigenergy SigenStor All-in-One system, Growatt APX battery system, and FOX ESS PowerQ All-in-One system allow you to configure capacities anywhere from 10 kWh to 120 kWh. This means you can comfortably start with a 10 to 20 kWh setup, monitor its performance over time, and easily expand your battery capacity later based on your actual energy usage.

It depends on the AC starting surge, running watts, battery output and load panel design. A soft starter or load management may be required.
A typical large 4-ton or 5-ton central AC unit uses about 4,000~5,500 watts (4~5.5kW} while running. The 11.4kW inverter can handle this easily, and still with plenty of room left over for your fridge, lights, and TV. Like Sigenergy Sigen 11.4kW controller surge peak is 17.1kW ( 10s ), which can handle 2 5-ton central conditions.

If your system is off-grid system, and need to power whole home or run AC during a power outage, the inverter is only the engine—the battery is the fuel tank. An AC drawing 5kWh per hour will drain a standard 10kWh battery in just 2 hours of continuous running. To run an AC comfortably through a hot afternoon or overnight, you will want a battery bank of at least 20kWh~30kWh paired with that 11.4kW inverter. Also, most of the battery storage system has smart loading hub, you have the loading wiring to the controllable breakers, you can control the breakers via App or software.

Whole-home backup is designed to support most home circuits, while partial backup focuses on selected critical loads such as refrigeration, lighting, internet and key outlets.

UL9540 generally applies to the energy storage system configuration ( inverter and battery system). Individual batteries may also carry standards such as UL1973 or UL9540A test data, the inverter carries UL1741.