12-Year Battery Warranty 12-Year Battery Warranty
ISO 9001 Certified ISO 9001 Certified
CEC Listed Systems CEC Listed Systems
Designed & Engineered in TX Engineered In TX
4.6

Google Rating (350+ Reviews)

Batteries Reliable energy storage for home, RV and off-grid.

Inverters Convert and manage power efficiently for home and off-grid.

BigBattery NEXUS 2 battery and EG4 12000XP inverter kit

Solar Kits Complete systems with battery + inverter, matched.

BigBattery, EG4 Charger, cables & system accessories

Accessories Chargers, cables, conduit and everything to complete your system.

Home Solar & Backup Grid-Tied · UL-Certified

Home Solar & Backup BigBattery solar LiFePO4 batteries deliver premium, high-performance energy storage for residential grid-tied systems engineered for reliability, longevity, and clean, efficient power for your home.

Off-Grid Power Cabin · Home · Ranch

Off-Grid Power BigBattery LiFePO4 batteries for off-grid solar deliver reliable and long-lasting energy storage for true energy independence.

Golf Carts & Utility Club Car · EZGO · Yamaha

Golf Carts & Utility BigBattery golf cart batteries are engineered to increase performance, run times, faster charging, and reliable power with top American brands like Club Car, E-Z-GO, Yamaha & more.

RV, Van & Camper Class A, B, C & Van Life

RV, Van & Camper BigBattery lithium RV batteries are lightweight, fast-charging, and built for homes that roam.

Marine & Boats Trolling · Sail · Yacht

Marine & Boats BigBattery lithium batteries deliver deep-cycle performance and high energy density, ideal for trolling motors and onboard electronics.

Industrial & Commercial Lifts · Sweepers · C&I

Industrial & Commercial BigBattery lithium batteries for industrial equipment deliver long-lasting power ideal for scissor lift fleets, floor sweepers and C&I.

Free solar calculator

Solar Battery & System Sizing Calculator

LiFePO4 Lithium Batteries for Home Backup, Solar, Golf Carts, RV & Marine

Get a custom battery, inverter and solar panel recommendation for your home or off-grid system.

1Choose Grid-Tied or Off-Grid
2Enter your ZIP & energy use
3Get your custom kit
4Order online or talk to an expert

Start the Free Calculator

Powering an RV or van? Try the RV calculator

100% free About 60 seconds Custom to your ZIP

Why Americans Choose BigBattery

Factory-Direct Pricing

No middlemen

Premium LiFePO4 at prices that make clean energy accessible. We cut out the middlemen so you don't overpay.
Universal Compatibility

Open BMS

Open-communication BMS integrates with virtually any setup. No proprietary lockouts, by design.
Real Experts, Texas-Based

Texas team

U.S.-based support with fast response times. We answer the phone when you need help.
12-Year Warranty

4,000+ cycles

An industry-leading warranty backed by 4,000+ charge cycles. We stand behind every product.

Not sure what you need? Talk to a Texas-based expert. (818) 280-3091

Best Sellers

Golf Cart

48V EAGLE 2 Golf Cart Battery Kit

LiFePO4
64Ah
3.26kWh
2× / 3× / 4× kits

From $1,645

or $69/mo

View Details

Off-Grid

NEXUS 2 + APEX 6.5K Off-Grid System

16kWh
6.5K Inverter
Off-Grid ESS

From $4,305

or $179/mo

View Details

Grid-Tied

ETHOS + EG4 FlexBOSS18 Home Backup

UL-9540
18kW Inverter
Grid-Tied

From $5,980

or $249/mo

View Details

View Current Deals

Dustin McGuire Verified

My first warranty interaction with BigBattery was unexpectedly positive. I have had awful experiences in the past getting solar equipment warranty replacements from other companies. My inverter failed and I was worried about warranty replacement of an extremely heavy(165lb) inverter. Dylan at BB helped me through the entire process, description, diagnosis and replacement procedures. I was very disappointed to find out my inverter was no longer available. Dylan made me aware of this and got approval for what may be the most cost effective and modular inverters(EG4 6000xp’s). I am grateful that Dylan helped get me back off grid. Thank You Dylan and the BigBattery team for making a bad situation into positive encounter!
Monty Nash Verified

I called and asked questions they had great tech help and customer service. I ended up ordering a 48 volt battery pack for my golf cart and water resistant charger kit. Was an awesome price and even better product. I have been super happy with the battery pack and not having to constantly add water to the old lead acid batteries.
David Mahlmeister Verified

I recently installed a new system using 16 of the new BigBattery ETHOS modules and it has been working PERFECTLY... Installing the modules and controller was a breeze as everything is plug and play.

BigBattery vs. Typical Brands

More Value. Better Performance.

See how we compare where it matters most.

Feature	BigBattery	Typical Battery Brands
Warranty	BigBattery10–12 years	Typical brands1–5 years
Manufacturing	BigBatteryDesigned & engineered in the USA (Texas)	Typical brandsOften overseas, private-labeled
Battery Chemistry	BigBatteryLiFePO4 (thermally stable)	Typical brandsMix of LiFePO4 and less stable NMC lithium-ion
Compatibility	BigBatteryOpen-communication BMS, works with most inverters	Typical brandsOften proprietary, locked to one ecosystem
Pricing Model	BigBatteryDirect-to-consumer, no dealer markup	Typical brandsOften sold through dealer networks
Support	BigBatteryU.S.-based team, phone/chat/email	Typical brandsVaries — often overseas or ticket-only

Shop BigBattery Systems

Not Sure What You Need?

Whether you prefer to explore on your own or talk to a real expert — we've got you covered.

Two ways to find the right system:

Self-guided System sizing tool

Solar Battery Sizing Calculator

Takes about 60 seconds
Instant recommendations
Compare options side by side

Calculate My Battery Size

US-based customer support Speak to our US based experts

Speak with an Expert

Free consultation
No obligation quote
Mon–Fri 8am–6pm PT

Call (818) 280-3091

No spam, no pressure. Trusted by 50,000+ Americans since 2011.

Frequently Asked Questions

What does BigBattery sell, and who is it for?

BigBattery designs and manufactures lithium batteries, including LiFePO4 battery packs, solar batteries, and complete off grid solar systems; for homeowners, RV and van owners, boaters, golf cart owners, and industrial or commercial fleets. Whether you need a solar battery backup for your house, a full off-grid setup for a cabin, or a deep cycle lithium battery for your boat or golf cart, you'll find it in our Home Solar & Backup, Off-Grid, RV, Marine, or Golf Cart lineups.

Is BigBattery compatible with my existing solar system, inverter, or charge controller?

Yes, most BigBattery batteries use an open-communication BMS built for universal compatibility, so they work with major inverters and charge controllers like Victron, Growatt, and Schneider with no proprietary lockouts. UL-certified, grid-tied systems like NEXUS are designed to integrate directly with select hybrid inverters. If you would like more information on your specific setup, call (818) 280-3091.

What certifications does BigBattery meet?

BigBattery products are ISO 9001 certified, CEC-listed for grid-tied solar systems, and designed, and engineered in the USA. These certifications confirm manufacturing quality standards and, for CEC-listed systems, can help qualify you for state and utility solar incentive programs.

Why does BigBattery use LiFePO4 instead of other lithium chemistries?

BigBattery builds nearly every lithium battery on LiFePO4 (lithium iron phosphate) chemistry because it's the most thermally stable lithium ion battery option available, with a significantly lower risk of overheating than NMC lithium-ion. LiFePO4 also delivers 4,000+ charge cycles and a decade or more of daily use, which is why we can back every LiFePO4 battery with a 10–12 year warranty. Learn more in Battery 101.

How do I know which BigBattery system is right for me?

Start with the free Solar Battery Sizing Calculator, it takes under 3 minutes and gives you a custom lithium battery or off grid solar system recommendation based on your daily energy usage. Prefer to talk it through? Call (818) 280-3091 to speak with a U.S.-based expert, no obligation.

What warranty and support does BigBattery provide?

Every BigBattery lithium battery comes with a 10–12 year warranty — the longest in the battery industry — plus U.S.-based support by phone, live chat, and email. Full terms are on our Policies page.

Does BigBattery ship nationwide, and how fast?

Yes, BigBattery ships nationwide from our Texas manufacturing facility. Most in-stock lithium batteries and solar batteries ship within 1–3 business days. Larger systems, like a full off grid solar system kit or inverter, may ship via freight with a longer window shown at checkout.

Do I need a professional to install a BigBattery system?

It depends on the system. Drop-in batteries for golf carts, RVs, and boats are plug-and-play and don't require an electrician. Larger grid-tied or off grid solar systems involving inverters and panel wiring should be installed by a licensed electrician or solar installer. If you're not sure what your setup requires, call (818) 280-3091 and our team can walk you through it.

Still have questions?

Our Texas-based team is happy to help you pick the right system.

(818) 280-3091 Contact us

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