Anker SOLIX BP3800 Expansion Battery – 3,840Wh LFP (For F3800)
- 3,840Wh Long-Lasting LFP Battery
- Seamless Expansion for Anker SOLIX F3800
- 3,000 Life Cycles and 10-Year Lifespan
- 5-Year Hassle-Free Warranty
Anker SOLIX BP3800 — 3,840Wh LFP Expansion Battery for F3800
Scale Your Off-Grid Power Without Starting Over
- FREE System Design Consultation -- Engineers size your storage for actual consumption
- FREE Shipping -- Ships free — no freight surprises
$1,227.95
Out of stock
In the box
- Anker SOLIX BP3800 Expansion Battery
- User documentation
Scale Your Off-Grid Power Without Starting Over
The Anker SOLIX BP3800 adds 3,840Wh of LiFePO4 capacity to your F3800 power station — giving you field-tested energy storage that grows with your off-grid setup. With 3,000 life cycles and a 10-year expected lifespan, this LFP expansion battery is built-to-survive years of daily charge cycles on a homestead or remote cabin. It connects seamlessly to your existing F3800, so you can expand your grid-independent system without replacing your core unit. Ships free. Finance with Affirm — pay as low as $103/month on approved credit.
FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
3,840Wh LFP Battery
3,000 Life Cycles
10-Year Lifespan
5-Year Warranty
3,840Wh
LFP Battery Capacity
3,000
Rated Life Cycles
10 Years
Expected Lifespan
Expand Your Off-Grid Runway Without Guesswork
Your neighbor's grid-tied system shuts down the moment the utility fails. That's the problem with equipment cobbled together without verified compatibility. The BP3800 is a field-tested expansion module designed specifically for the Anker SOLIX F3800 — no voltage mismatches, no BMS communication errors, no hoping it works. At Off Grid Vault, we only carry components pre-vetted to integrate cleanly. Add 3,840Wh of LiFePO4 capacity and know that every cell talks to your F3800 exactly as designed. This is how you build a grid-independent system that actually holds up when the sun disappears for days.
LiFePO4 Chemistry That Outlasts the Alternatives
Lithium-ion power stations degrade fast under daily off-grid cycling. The BP3800 uses LiFePO4 cells rated for 3,000 charge cycles — that translates to a 10-year operational lifespan at consistent use. LiFePO4 also maintains stable voltage through its discharge curve, meaning your F3800 inverter receives clean power from 100% down to low state of charge. No sudden voltage drops that trip your loads. No thermal runaway risk. This is the chemistry people on DIYsolarforum and r/solar specify when they are building systems meant to last, not just survive a weekend camping trip.
Scale Your Storage on Your Timeline
One BP3800 gets you 3,840Wh added to your F3800 base. Need more? Stack additional units as your consumption grows — whether you are adding a well pump, expanding to a second outbuilding, or extending your days of autonomy. The F3800 architecture supports modular expansion without reconfiguring your entire system. Start with what you need today, add capacity when your reality demands it. That flexibility matters when you are building a homestead that evolves over years, not installing a static system that gets replaced the moment your load profile changes.
Installation Compatibility
Confirm your setup is ready for the BP3800 before ordering.
- Base unit must be Anker SOLIX F3800 power station
- Expansion battery does not operate as a standalone power source
- LFP chemistry must match base unit battery type
Where This Fits
The BP3800 is built for setups that outgrow their starting capacity.
Homestead Power Expansion
Remote Cabin Backup
Extended Emergency Autonomy
Full specifications
At a glance
- Dimensions
- See product page
- Surface
- See product page
- Warranty
- 5-Year Hassle-Free Warranty
Full specifications7 data points across 4 categories
Dimensions
| Dimensions | See product page |
|---|
Power & Performance
| Battery Capacity | 3,840Wh |
|---|---|
| Battery Chemistry | LFP (LiFePO4) |
| Rated Life Cycles | 3,000 |
| Expected Lifespan | 10 Years |
Materials
| Materials | See product page |
|---|
Compliance & Warranty
| Warranty | 5-Year Hassle-Free Warranty |
|---|
The Off Grid Vault Promise
Every product we carry is vetted for real-world off-grid performance. If it doesn't meet our standards, it doesn't make the cut.
Free ShippingShips free on all orders — no minimums, no thresholds, no surprise freight charges.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
★★★★★
“Added two BP3800s to my F3800 for the cabin in northern Arizona. Ran a fridge, well pump, and lights through a three-day overcast stretch without dropping below 40% state of charge. Plug-and-play integration — no fiddling with settings. Exactly what I needed to stop worrying about autonomy.”
Frequently Asked Questions
3,840Wh at $1,228 works out to roughly $0.32 per watt-hour of LiFePO4 storage. Compare that to replacing a lead-acid bank that costs less upfront but dies in 300-500 cycles. This battery holds 80% capacity after 3,000 cycles — roughly a decade of daily use. You are not spending more, you are spending once. Finance with Affirm and pay as low as $102/month.
Off Grid Vault is an authorized dealer, which means your 5-year warranty claim goes through us — not into a ticket queue. We also provide free system design consultation. If you are unsure whether one BP3800 is enough for your daily kWh consumption, our engineers will size it against your actual load profile. That human accountability does not exist on generic marketplace listings.
The BP3800 is engineered exclusively for the Anker SOLIX F3800. It connects directly using the F3800 expansion port — no custom cables, no charge controller configuration, no BMS protocol mismatches. If you own an F3800, this drops in. If you are running a different inverter or power station platform, contact us for the correct expansion battery for your system.
The 5-year hassle-free warranty covers manufacturing defects and abnormal capacity degradation below rated specifications. As an authorized dealer, Off Grid Vault processes warranty claims directly — you deal with us, not a third-party support line. For context, the BP3800 is rated for 3,000 cycles with 80% capacity retention. If your unit falls short of that within the warranty period, Anker makes it right.
The F3800 supports modular expansion with multiple BP3800 batteries. The exact number depends on your F3800 firmware version and configuration. Before stacking units, we recommend using our free system design consultation. Tell us your daily kWh consumption and target days of autonomy, and we will tell you exactly how many expansion batteries make sense for your setup.
Yes. Finance with Affirm and pay as low as $102/month on approved credit. You can also split into 4 interest-free payments with Klarna. No need to front the full amount upfront — add the storage you need right now and keep your cash flow intact for the rest of your off-grid build.
The Off Grid Vault Promise
Every product we carry is vetted for real-world off-grid performance. If it doesn't meet our standards, it doesn't make the cut.
Free Shipping
Ships free on all orders — no minimums, no thresholds, no surprise freight charges.
30-Day Performance Guarantee
If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Free System Design Consultation
Our engineers size your system for your actual consumption — no guesswork, no incompatible components.
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About anker Expansion Batteries
anker is a trusted manufacturer of premium expansion batteries. OffGridVault is an authorized dealer offering the full anker lineup with free delivery, price match guarantee, and expert support.
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