How to Add Battery Backup to Your Existing Grid-Tied Solar System (EG4)
- Fabian Wells
- May 13
- 2 min read
Already have solar panels but no battery backup? You’re not alone, thousands of Texas homeowners were sold grid-tied systems that work great on sunny days but shut down completely when the power goes out.
The good news? You don’t need to start from scratch. With the right battery system and inverter setup, you can upgrade your current system into a hybrid solar solution that stores energy, powers your home during outages, and saves you more in the long run.
Why Grid-Tied Alone Isn’t Enough
Most standard solar systems are grid-tied, meaning they only work when the power grid is on. Here’s the catch:
When the grid fails (which is common in Texas), your system shuts off for safety leaving you without power even when the sun is shining.
That’s why more and more homeowners are adding battery storage to their systems.
What Is a Hybrid Solar System?
A hybrid system combines your existing solar panels with a battery and hybrid inverter, giving you like EG4:
• Backup power when the grid goes down
• Energy storage for nights and cloudy days
• Smarter control over when and how your solar energy is used
• Continued energy savings and peace of mind
Benefits of Adding Battery Backup
✅ Blackout Protection
Run your lights, fridge, Wi-Fi, and even AC during outages.
✅ Energy Independence
Store extra power during the day and use it at night — reducing your reliance on the grid.
✅ Lower Your Electric Bill
Avoid peak rates by using stored energy during high-cost times.
✅ Increased System ROI
Make the most of your existing panels and maximize your investment.
At Sundown Solar, we install battery systems that integrate with most existing solar arrays!
Our Process
1. System Evaluation
We check your panels, inverter, and electrical layout.
2. Design + Sizing
We calculate how much battery storage you need for your lifestyle.
3. Installation + Commissioning
We install your battery system, update your inverter (if needed), and ensure it works with your home and grid.
4. Walkthrough + Monitoring Setup
You’ll know exactly how to read, manage, and maximize your system — no guesswork.
Ready to Upgrade Your Solar System?
If your system is already installed, you’re halfway there. Let us help you unlock its full potential with battery backup.
👉 [Schedule Your Battery Upgrade Assessment by filling out the FORM]
👉 Or call (210) 537-9865
Proudly serving San Antonio, Boerne, Helotes, and surrounding areas.
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