Infinium designs and installs Tesla, Enphase, FranklinWH, and Lunar battery systems around your home’s actual loads — with our own in-house electrical team, not a subcontractor.
Serving the Bay Area since
CSLB licensed contractor
Electrical design & install
Tesla · Enphase · FranklinWH ·
Lunar
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Between Public Safety Power Shutoffs, aging distribution lines, high time-of-use rates, and NEM 3.0, storing your own energy has become a practical decision for Bay Area homes — not just an upgrade. Here’s what a battery changes.
When PG&E de-energizes lines during high-wind and wildfire conditions, a battery keeps your selected circuits — refrigeration, internet, lighting, medical equipment — running automatically, without a noisy generator. Systems switch over in a fraction of a second so you may barely notice the grid is down.
On PG&E time-of-use plans, electricity is most expensive in the late-afternoon and evening peak. A battery lets you use stored energy during those peak hours instead of buying from the grid at the highest rate. Actual savings depend on your rate plan, usage, and system size.
Under NEM 3.0, exporting solar back to the grid is worth far less than it used to be. Storing your midday solar in a battery and using it later in the day is now how most new solar-plus-battery systems get the most value from what they generate.
Multi-day shutoffs, heat waves that strain the grid, and rolling outages all call for a plan around your critical loads. We design reserve settings so essential circuits stay powered through extended events, and pair batteries with solar when you need to recharge during a long outage.
Every home is different, so we’re not tied to one brand. Below is a side-by-side of the systems we install most across the Bay Area. Use the plain-language “best for” summary underneath if the spec table feels like a lot.
| Feature | Enphase IQ Battery 10CAC-coupled · modular | Tesla Powerwall 3Integrated solar inverter | FranklinWH aPower 2Whole-home platform | Lunar Energy BatteryIntegrated · stackable |
|---|---|---|---|---|
| Usable energy | ~10 kWh per unit | ~13.5 kWh per unit | ~15 kWh per unit | ~5 kWh per module (stackable) |
| Continuous output | ~7.08 kW | ~11.5 kW | ~10 kW (via aGate) | Scales with modules |
| Architecture | Microinverter / AC-coupled | Integrated hybrid inverter | aGate whole-home controller | Integrated inverter, circuit-level |
| Whole-home capable | Yes, with multiple units | Yes, large loads | Yes, designed for it | Yes, with stacked modules |
| Expansion | Add units in 10 kWh steps | Add Powerwall units | Add aPower units | Add modules to the stack |
| Best-fit scenario | Existing Enphase solar, modular growth | Large loads, new solar-plus-battery | Whole-home, flexible retrofit | Local CA support, clean stacked design |
| Manufacturer warranty | 15 years | 10 years | 15 years | 12.5 years |
Specifications are typical published values and can change; final capability depends on your electrical panel, loads, and system design. Infinium is an installer, not the manufacturer.
Not sure which system fits your home?
Talk to an Infinium battery designer — not a call center — about your panel, loads, and goals.
The right system depends on what you already have and what you want to power. Find the row that sounds like you.
Start with Enphase IQ Battery for compatibility and modular expansion — often the simplest path to storage on an existing system.
Look at high-output options like Powerwall 3 or FranklinWH, with smart load management so big loads don't overwhelm the system.
Compare multi-unit and high-capacity configurations, and consider pairing with solar so the battery recharges during multi-day events.
An integrated inverter architecture (e.g., Powerwall 3 or Lunar) can simplify a brand-new solar-plus-battery design.
A battery without solar can charge from the grid off-peak; we plan the design so it's ready to add solar down the road.
We design around refrigeration, internet, lighting, medical needs, and selected circuits — a smaller, cost-effective essential-load system.
These are real Infinium installs, not stock photos. Each battery system was designed around the home’s panel, loads, and backup goals by our in-house team.
Dual Enphase IQ Batteries with an Enphase System Controller, sized to keep essential circuits and the home's cooling running through PG&E outages.
Backup goal: [essential + AC loads]
Solar: [existing/new]
A Tesla Powerwall 3 with integrated inverter installed for a home needing high continuous output for larger simultaneous loads.
Backup goal: [whole-home / large loads]
Solar: [new solar + battery]
FranklinWH aPower 2 batteries provide increased energy storage and backup capacity, designed to support more of the home’s electrical needs during an outage.
Backup goal: [whole-home / large loads]
Solar: [existing/new]
A clean, low-profile Lunar Energy stack with integrated inverter and circuit-level control, matched to the home's backup priorities.
Backup goal: [selected circuits]
Solar: [existing/new]
Battery capacity is measured two ways, and both matter. Getting the size right is about matching your goals to your loads — here’s how to think about it.
kWh (kilowatt-hours) is how much energy the battery stores — this drives how long it can run your loads. kW (kilowatts) is how much power it can deliver at once — this drives how many things you can run simultaneously. A simple way to estimate runtime: usable capacity ÷ average load. For example, a 10 kWh battery serving a steady 1 kW load runs for roughly 10 hours.
During your consultation we look at whether you want essential- load or whole-home backup; whether you have air conditioning, electric water heating, a pool, a well pump, electric cooking, or EV charging; how long you want to ride through an outage; and whether solar will recharge the battery during daylight. Then we recommend a range, not a one-size-fits-all number.
These illustrate how backup goals map to system size. Your design is confirmed after a site evaluation.
Smaller system · longest per-kWh runtime
Mid-size · essentials plus comfort loads
Larger · multiple batteries + load controls
A battery install touches your electrical panel, your utility connection, and your roof or walls. Because our electrical work is in-house, we manage the whole sequence — you’re not juggling subcontractors.
Consultation & backup-goal review
We talk through what you want to keep running, your rate plan, and your budget, and whether backup, savings, or both are the priority.
Site survey, load analysis & compatibility review
We assess your panel, existing solar and electrical conditions, roof, and loads to confirm what's required and what's possible.
Battery selection & preliminary design
We recommend a system and size range matched to your home — not a default product — and explain the trade-offs.
Final engineering, permitting & utility coordination
We handle plans, permits, and PG&E interconnection paperwork. A main-panel upgrade, meter adapter, gateway, or load-management device is flagged here if needed.
Installation & electrical integration
Our in-house electricians mount and wire the system, integrate it with your panel and any solar, and set up load controls.
Inspection, commissioning, app setup & training
We pass inspection, commission the system, get your monitoring app working, and show you how to use reserve and backup settings.
Warranty documentation & ongoing support
We register your equipment, hand over warranty documents, and stay available for monitoring and service.
Most battery installs involve electrical work, and often roofing and solar too. Infinium does all of it in-house, which means fewer handoffs, one point of accountability, and a design that fits your whole home.
Our own licensed electricians handle panel work, interconnection, and integration — not a rotating cast of subcontractors.
We evaluate your existing solar, electrical panel, roofing condition, and backup loads together before recommending equipment.
You're not forced into one battery brand. We match Tesla, Enphase, FranklinWH, or Lunar to your home and goals.
Operations in Campbell and Pleasanton serving San Jose, the Peninsula, and the East Bay since 2008.
CSLB licensed contractor #1031953, with manufacturer certifications for the systems we install.
We don’t publish a single price because no two homes are the same. What we can do is explain honestly what moves the number, so there are no surprises.
The price of the battery itself is only part of the picture. The complete installed-system cost also includes electrical integration, permitting, interconnection, any panel or infrastructure upgrades, and labor. When you compare quotes, compare installed-system costs — not just hardware.
Financing: financing options are available so you can spread the investment over time. See financing options →
Federal and California incentive programs for battery storage change periodically, and eligibility depends on your specific situation. We’ll walk you through what currently applies — without guaranteeing tax-credit eligibility or utility savings.
There are two kinds of coverage. Manufacturer warranties cover the battery equipment (see the comparison table). Infinium’s workmanship and service covers the installation itself. We register your equipment, help with monitoring, and handle service requests and warranty claims.
We’ll assess your home and give you a clear, itemized proposal — equipment, electrical, permitting, and financing options.
In most cases, no. Standard grid-tied solar panel systems automatically shut down during a power outage to protect utility workers and prevent electricity from flowing back into the grid.
Most homeowners need a battery backup system to keep using their solar energy during an outage.
Adding a home battery backup system allows you to store excess solar energy and use it when the grid goes down, including at night. With the right equipment, your solar panels can also continue generating electricity and recharge your battery during an outage.
For more information, read our blog: Everything You Need to Know if You're New to Solar.
Yes, a properly sized home battery can power central air conditioning during an outage.
However, air conditioners require a significant amount of electricity, especially when the compressor first starts. The battery must supply enough power to handle both the initial startup demand and ongoing operation.
Systems such as the Tesla Powerwall 3 and FranklinWH aPower 2 can support larger household electrical loads, including compatible central air conditioning systems.
Running your AC will use stored energy more quickly, potentially shortening your available backup time.
Infinium can evaluate your home's air conditioning equipment and recommend a battery configuration designed to support your cooling needs.
The number of batteries needed for whole-home backup depends on your home's electricity consumption, the appliances you want to operate, and how long you want backup power to last.
Some homes can support their essential needs with a single battery, while whole-home backup may require two or more batteries, especially when powering central air conditioning, electric appliances, or EV chargers.
Two important factors determine your battery requirements:
A properly designed system considers both factors to avoid overloading the batteries during an outage.
Infinium offers several home battery storage options, including expandable systems that can accommodate different household energy needs.
Contact Infinium for a personalized battery sizing recommendation.
Yes, charging an electric vehicle during a power outage is possible with a compatible home battery backup system.
Your EV charger must be connected to a circuit that receives backup power, and your battery must have enough stored energy and output capacity to support charging.
However, EV charging consumes a substantial amount of electricity and can quickly drain a home battery.
Some systems offer smart charging controls that reduce or stop EV charging to prioritize essential household appliances.
Infinium provides EV charger installation services and can help homeowners coordinate solar, batteries, and EV charging equipment.
Interested in using your vehicle to power your home instead? Read our blog: Bidirectional Charging: How Electric Vehicles Can Help Power Your Home.
Yes. Many home batteries are designed for outdoor installation, making them convenient for Bay Area homeowners with limited garage or indoor space.
Products such as the Tesla Powerwall and FranklinWH batteries have models designed to withstand outdoor weather conditions.
However, battery placement must follow manufacturer requirements and applicable local electrical, building, and fire safety codes.
Important considerations include direct sunlight, temperature exposure, required clearances, and proximity to doors and windows.
Infinium's in-house electrical team can evaluate your property and recommend a safe, code-compliant location for your battery installation.
Most home battery systems allow you to set a backup reserve, which is a percentage of stored energy saved for potential power outages.
For example, setting a 20% backup reserve generally means your battery will stop using that reserved energy for everyday electricity savings while the grid is operating.
During an actual power outage, the battery can use that reserved energy to keep your home powered.
If the battery reaches its minimum operating charge during an outage, the system may shut off backup power to protect itself. If compatible solar panels are connected, the battery may begin recharging when sufficient sunlight becomes available.
Homeowners can adjust backup reserve settings based on their priorities, such as maximizing everyday savings or keeping more energy available for emergencies.
Systems like the Tesla Powerwall 3 offer app-based monitoring and backup reserve controls.
Yes, many modern home battery systems allow additional storage capacity to be added later.
Expandable battery systems give homeowners flexibility as their electricity needs change.
For example, you may decide to increase storage after purchasing an electric vehicle, installing a heat pump, or adding more electrical appliances.
All the battery products that we offer currently, including the Enphase IQ Battery 10C and Lunar Energy Battery offer modular storage options for appropriately designed installations.
However, expansion depends on the manufacturer, model compatibility, available installation space, and existing electrical equipment.
Infinium can help homeowners plan for future battery expansion during their initial installation.
Home battery installation timelines vary depending on your city, system design, electrical requirements, and utility approvals.
At Infinium Solar, Roofing and Electric, our in-house team coordinates design, engineering, permitting, electrical installation, inspections, and utility paperwork.
This helps streamline the process and gives homeowners a single point of contact throughout their project.
For a straightforward residential battery installation, the physical installation may take approximately one to three days. However, engineering, permitting, inspections, and PG&E coordination can extend the overall timeline to several weeks or longer.
Projects involving multiple batteries, electrical panel upgrades, or modifications to an existing solar system may require additional time.
Contact Infinium to discuss your battery installation and estimated project timeline.
Home battery storage can help Bay Area homeowners manage electricity costs under PG&E's Time-of-Use (TOU) rate plans.
With TOU pricing, electricity rates vary depending on when power is used. Electricity is generally more expensive during designated peak-demand hours.
A battery can store excess solar energy during the day and discharge that stored energy when electricity rates are higher, reducing the amount of power purchased from PG&E during peak hours.
For homeowners under California's Net Billing Tariff, sometimes called NEM 3.0, storing solar energy for later use can also provide an alternative to exporting electricity at lower compensation rates.
Actual savings depend on your PG&E rate plan, solar production, electricity consumption, and battery settings.
Learn more about solar batteries and PG&E rates in these Infinium blogs:
California's NEM 3.0 and the Importance of Solar Battery Storage
PG&E Rate Increases Over the Last Decade and How Solar Can Help
The main difference is how much of your home receives electricity during a power outage.
Whole-home backup is designed to supply electricity to most or all household circuits, potentially including central air conditioning, kitchen appliances, and other larger electrical loads.
Essential-load backup powers selected appliances and circuits, commonly including refrigerators, lighting, internet equipment, medical devices, and certain electrical outlets.
Some systems, such as the Lunar Energy Battery, offer compatible smart circuit controls that can prioritize important appliances during an outage.
Infinium designs both essential-load and whole-home battery backup systems based on your home's electrical requirements.
Both home batteries and standby generators can provide backup power during outages, but they offer different advantages.
Home battery backup systems operate quietly, require little routine maintenance, and automatically provide stored electricity during an outage. When paired with compatible solar panels, they may also recharge using solar energy while the grid is unavailable.
Standby generators use fuel, typically natural gas, propane, or diesel, to produce electricity. They can provide extended backup power as long as sufficient fuel is available, but require routine maintenance and produce engine noise and exhaust.
For homeowners interested in solar energy storage, lower maintenance, and reducing electricity purchases during peak-rate hours, a battery may provide additional everyday benefits beyond outage protection.
Explore Infinium's home battery backup solutions to learn which system may be right for your home.
Generally, no. Most properly configured home battery systems can continue providing backup electricity during a power outage without an active internet connection.
Their core backup functions operate through local electrical controls and do not depend on continuous internet access.
However, internet access may be needed for remote monitoring, mobile app notifications, software updates, and certain advanced energy management features.
Without internet service, you may temporarily lose the ability to check battery performance remotely through your smartphone.
Modern systems such as the Enphase IQ Battery 10C offer monitoring capabilities that help homeowners track their system's energy production, consumption, and battery performance when communications are available.
Yes. Many existing solar panel systems can be upgraded with home battery storage without replacing the entire solar installation.
Compatibility depends on the age and condition of your equipment, inverter technology, electrical panel, and battery system you choose.
Certain AC-coupled batteries, such as the FranklinWH aPower 2, can integrate with qualifying existing solar systems, making them a practical option for homeowners who want to add energy storage.
However, older equipment may require additional electrical modifications, and changes to an existing solar installation should be reviewed for potential PG&E interconnection or billing impacts.
Infinium works with homeowners who already have solar, including systems installed by other companies.
If you're unsure about the condition of your existing panels, read our blog: How Long Do Solar Panels Last?
Contact our team to explore adding battery storage to your existing solar system.
Modern home battery systems generally require very little routine maintenance compared to fuel-powered generators.
Most batteries automatically manage charging, discharging, and operating temperatures through built-in control systems.
Homeowners should periodically check their monitoring app for system alerts, keep the surrounding installation area clear, and follow manufacturer maintenance recommendations.
Avoid opening battery enclosures or attempting electrical repairs yourself.
If you notice reduced battery performance, unusual warning messages, or charging problems, contact a qualified service professional.
Infinium provides ongoing support for solar and home battery systems, helping homeowners understand their equipment and address service concerns after installation.
Your home battery does not automatically stop working when its manufacturer warranty expires.
Most residential battery systems include manufacturer warranties covering a specified number of years, sometimes with additional energy-retention or usage conditions.
Depending on the manufacturer and model, warranties commonly range from 10 to 15 years.
As batteries age, their ability to store energy gradually decreases. This may result in shorter backup times compared to when the system was first installed.
After the warranty expires, the battery may continue operating normally, although repairs or replacement costs may become the homeowner's responsibility.
Homeowners should review individual manufacturer warranty terms before purchasing. For example, Infinium provides information about the warranty and performance specifications of the Tesla Powerwall 3 and Enphase IQ Battery 10C.
Infinium can help homeowners review battery performance, understand warranty coverage, and explore replacement or upgrade options when needed.
Whether you're preparing for PG&E power outages, looking to reduce peak-hour electricity costs, or adding storage to an existing solar system, Infinium Solar, Roofing and Electric can help.
Serving Bay Area homeowners since 2008, our in-house team handles solar, battery backup, roofing, and electrical work under one roof.
We work with leading battery manufacturers, including Tesla, Enphase, FranklinWH, and Lunar Energy, to design systems that fit your home's electrical needs.
Contact Infinium today to schedule your home battery consultation.
Learn more about our Bay Area home battery backup installation services.
Talk to a local Infinium battery designer about backup, savings, and the right system for your home.
