How do you choose the right home battery in Hawaii?

Picture a Tuesday-night outage: a properly configured and charged battery can keep selected essentials powered even when the grid is down.

That is the moment most homeowners picture when they think about a battery. But the right battery is not just about outages. It is also about long-term savings. Without a battery, your solar panels make power during the day and send much of it back to the grid. With one, you store that power and use it at night.

That is why we recommend every solar customer add a battery. Savings and backup depend on equipment, usage, utility rules, weather and stored charge. Off-grid operation requires a separate assessment. Solar without batteries remains available. The choice depends on your energy use and backup goals.

Step 1: Decide what you want to keep running

Most batteries back up selected circuits, not your whole house. So start with a simple question: during an outage, what do you actually need?

• Essentials: fridge, lights, Wi-Fi, phone charging, fans.

• Comfort: TV, a few more outlets.

• Big loads: AC, a well pump, an EV charger.

The more you want to run, the more storage you need.

Step 2: Figure out how much storage you need

One Tesla Powerwall 3 stores 13.5 kWh. That can run essentials like your fridge, lights, Wi-Fi and fans for about a day under modest essential-load usage, potentially longer with solar recharging; runtime varies with loads, charge, weather and system design.

AC is a different story. Air conditioning uses a lot of power. If you want AC during an outage, we recommend two or more batteries.

Step 3: Compare the options

Independent Energy Hawaii installs Tesla Powerwall 3, Franklin, Enphase and Sigenergy batteries. For most Hawaii homes, we recommend the Powerwall 3 for the best savings.

Enphase is a solid modular choice, but it costs more per kWh of storage. If you already have Enphase equipment on your roof, it may still be the simplest fit.

Step 4: Check what you already have

Already have solar? You can still add a battery. Batteries can be added to many systems after compatibility, electrical capacity and utility requirements are confirmed. Our team uses meters to make sure older panels work with the new battery before anything is installed.

Battery-only installs also qualify for a Participate Energy prepaid lease, which costs about 30 percent less upfront.

Step 5: Think about long-term coverage

A battery is a 10-plus year investment, so coverage matters. Every Independent Energy Hawaii system includes up to 30 years of coverage through Solar Insure. Optional SI-30 Total battery coverage is subject to equipment eligibility and policy terms. Confirm covered diagnostics, repair, labor and capacity-related replacement provisions in your policy.

Key takeaways

• Start with what you want to keep running during an outage.

• One Powerwall 3 may run modest essential loads for about a day; actual runtime varies. For AC, plan on two or more batteries and a load assessment.

• For most Hawaii homes, the Powerwall 3 offers the best savings at about $13,000 with new solar.

• Battery additions depend on equipment compatibility, electrical capacity and utility approval. Battery-only installs are eligible for a prepaid lease, subject to agreement terms.

Independent Energy Hawaii can help you size the right battery for your home and your outage plan.

We recommend every solar customer consider a battery for evening energy use and selected-circuit backup. Savings and runtime depend on system design, usage, utility rules, weather and stored charge. Solar without batteries remains available; off-grid operation requires a separate assessment.

Solar Insure coverage is subject to equipment eligibility and policy terms.