Benefits and Considerations For Installing a Second PV System
As your household grows and your energy needs increase — whether from adding air conditioning, purchasing an electric vehicle, working from home, or expanding your living space — you may find that your original PV system no longer fully offsets your electricity usage. Installing a second photovoltaic (PV) system can be a smart and effective way to meet that increased demand while keeping your electric bill under control.
If you’re a homeowner served by Hawaiian Electric Company (HECO), it’s important to evaluate a few key factors before moving forward.
Benefits of Adding a Second PV System
1 Cover Increased Energy Demand
A second PV system can be designed to meet your home’s higher electricity usage. By generating more solar power, you can continue minimizing your reliance on the grid and keep your HECO bill low — even as your lifestyle changes.
2 Add Battery Storage for Nighttime Use
If your first system did not include battery storage, adding a second system with batteries can significantly improve your energy independence.
Battery storage allows you to:
- ✅ Store excess solar energy produced during the day
- ✅ Use stored energy at night
- ✅ Reduce or potentially eliminate the amount of energy you pull from the grid overnight
This is especially beneficial in Hawaii, where evening energy use is often high and electricity rates can add up quickly.
3 Improve Energy Security and Backup Capability
A second system with battery storage can provide backup power for essential loads during grid outages. Depending on system design, you can keep critical appliances running and maintain comfort and safety during power interruptions.
Important Considerations Before Adding a Second PV System
While the benefits are clear, there are still several factors to review before moving forward.
1 Financing Considerations
Financing is an important factor when installing a second PV system.
Some solar lease companies will only finance a homeowner’s first PV system and do not offer financing for second systems. This is a common restriction in the leasing industry and can come as a surprise to homeowners who are looking to expand their solar capacity.
If you are considering a second PV system, you may need to:
- 🔘 Explore purchasing the system outright
- 🔘 Consider loan or other third-party financing options
- 🔘 Work with a contractor that offers alternative financing structures
Because financing guidelines vary by provider, it’s important to inform your sales representative upfront that this will be a second PV system. Doing so ensures they can review available options early in the process and help you avoid delays or unexpected limitations.
Understanding your financing path before design and permitting begins will make the expansion process much smoother.
2 Roof and Equipment Space
Adding a second system requires sufficient physical space for both panels and equipment.
Roof Space:
You’ll need enough usable roof area to accommodate the additional panels. Factors such as shading, roof orientation, and structural integrity will also influence system design.
Equipment Space:
Most PV equipment—such as inverters, disconnects, and batteries—is installed near your main service panel. It’s important to evaluate:
- 🔘 Available wall space
- 🔘 Clearance requirements
- 🔘 Access for maintenance
A site evaluation can help determine whether your home can support the new system layout.
Is a Second PV System Right for You?
If your electricity usage has increased and your current PV system no longer offsets your bill the way it once did, a second system may be an excellent solution. With the addition of battery storage, you can further reduce grid reliance, lower nighttime usage, and improve energy security.
Before moving forward, it’s important to review financing options and confirm your home has the necessary roof and equipment space.
Consulting with a knowledgeable solar professional can help you determine the best approach for expanding your system while maximizing long-term savings and performance.
Give us a call at (808) 425-9566 or request a free quote.
