Plug-In Capacity for Your PowerMax Ecosystem

More Power, Same System. Just Bigger.

The Oscal BP3600 Expansion Battery adds 3,600Wh of LFP capacity directly to your Oscal PowerMax3600 or PowerMax6000 without replacing anything. Stack up to 15 units and push your total system to 57,600Wh.

$1,199.00

Oscal BP3600 expansion battery standalone

Oscal BP3600 Expansion Battery - 3600Wh Scalable Power for PowerMax

by Oscal

$1,199.00

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3,600WhAdded Capacity Per Unit

Up to 15Units Stackable

57,600WhMax System Capacity

3,500+Cycles to 80% Capacity

The short version

The Oscal BP3600 Expansion Battery is a dedicated add-on battery for the Oscal PowerMax3600 and PowerMax6000 base stations, sold separately. It is not a standalone unit and requires a compatible PowerMax power station to operate. Each BP3600 adds 3,600Wh of LiFePO4 capacity, and you can stack up to 15 of them for a combined system total of 57,600Wh. If your current PowerMax runs out too fast during long outages or extended off-grid stays, this is the direct fix without buying a whole new system.

Everything it does, at a glance

Real loads, honest answers

What can it run?

Load	Supported	Notes
Refrigerator (150W average)	Yes	Approximate runtime varies by compressor cycle; managed through base station
LED Lighting (50W)	Yes	Extended runtime; exact duration depends on base station output and total system charge
CPAP Machine (30-60W)	Yes	Multi-night use possible depending on total system capacity
Box Fan (75W)	Yes	Comfortable extended runtime as part of the full PowerMax system
Phone and Laptop Charging	Yes	Handled through base station outputs; BP3600 extends total system duration

Is it right for you

Best for

Oscal PowerMax3600 or PowerMax6000 owners who need more runtime
Home backup users preparing for extended multi-day outages
Off-grid and cabin setups that run overnight or through cloudy stretches
RV and overlanding builds where adding a second standalone unit isn't practical
Solar system owners who want more storage to hold daytime generation
Anyone who wants to scale capacity gradually without replacing their base station

Not the best fit if

Anyone who does not own a compatible Oscal PowerMax3600 or PowerMax6000 base station
Shoppers looking for a standalone power station with its own outlets and inverter
Applications requiring a single compact, lightweight battery pack
Anyone who needs AC output from the expansion battery itself

Versus the alternative

How it compares

	Oscal BP3600 Expansion Battery	Buying a second full-size power station
Capacity Added	3,600Wh per unit, stackable to 57,600Wh total	Fixed to whatever the second unit ships with, not integrated
System Integration	Connects directly to PowerMax, managed through one app	Two separate systems with separate displays, apps, and controls
Scalability	Stack up to 15 units incrementally as needs grow	Requires buying another full unit each time you need more capacity
Battery Chemistry	LFP (LiFePO4) rated 3,500+ cycles to 80%	Varies by brand and model; often standard lithium-ion with fewer rated cycles
App and Monitoring	WiFi and Bluetooth, same app as your existing PowerMax	Separate app or no app; no unified system view
Simultaneous Charge and Discharge	Yes, supported	Depends on the second unit; often not integrated with first unit's behavior

Set it up right

Safety and installation

Built-In Battery Management System The integrated BMS monitors charge levels, temperature, and current to keep the BP3600 operating within safe parameters and protect both the battery and your connected base station.

Wide Operating Temperature Range The BP3600 discharges safely from -4F to 131F and charges from 32F to 122F, with optimal ranges defined so you know exactly where it performs best in your environment.

LFP Chemistry for Thermal Stability LiFePO4 chemistry is inherently more thermally stable than standard lithium-ion, reducing the risk of thermal runaway and making it a sensible choice for home and indoor-adjacent installations.

The numbers

Specifications

Battery Capacity	3,600Wh
Battery Type	LFP (LiFePO4)
Cycle Life	3,500+ cycles to 80% of original capacity
Compatible Base Stations	Oscal PowerMax3600, Oscal PowerMax6000
Max Units Stackable	Up to 15 units
Max Total System Capacity	57,600Wh
Battery Management System	Yes, integrated BMS
Simultaneous Charge and Discharge	Yes
App Control	Yes, via WiFi and Bluetooth
Charging Temperature	32F to 122F (0C to 50C); optimal 32F to 113F (0C to 45C)
Discharging Temperature	-4F to 131F (-20C to 55C); optimal 14F to 113F (-10C to 45C)
Storage Temperature	14F to 113F (-10C to 45C)
Weight	83.11 lbs (37.7 kg)
Dimensions (L x W x H)	590 x 350 x 441 mm
Warranty	4 years (manufacturer warranty)

Verify contents against the packing slip upon arrival. The BP3600 requires a compatible Oscal PowerMax3600 or PowerMax6000 base station, sold separately.In the box

What's included

Oscal BP3600 Extra Battery
Battery expansion cable
User manual and warranty card

Before you buy

Frequently asked questions

Does the Oscal BP3600 Expansion Battery work as a standalone power station?

No. The Oscal BP3600 is an expansion battery only and requires a compatible base station to function. It must be connected to an Oscal PowerMax3600 or PowerMax6000, both sold separately. It has no inverter or AC outlets of its own.

Which power stations are compatible with the Oscal BP3600?

The BP3600 is compatible with the Oscal PowerMax3600 and the Oscal PowerMax6000. If you own a different Oscal model or a power station from another brand, this unit will not work with it. Double-check your base station model before ordering.

How many BP3600 units can I stack together?

You can stack up to 15 BP3600 units alongside a compatible PowerMax base station. At full stack, your total system capacity reaches 57,600Wh. You don't have to add all 15 at once; you can start with one and add more over time.

Can the Oscal BP3600 charge and discharge at the same time?

Yes. The BP3600 supports simultaneous recharge and discharge, so your connected loads can keep running through the base station while the expansion battery is being recharged from solar panels or a grid connection. Recharge sources are managed through your PowerMax base station.

How long will the Oscal BP3600's LFP battery last over time?

The LFP (LiFePO4) cells in the BP3600 are rated for 3,500-plus charge cycles before capacity drops to 80% of the original rating. LFP chemistry is also more thermally stable than standard lithium-ion, which contributes to consistent performance under regular use.

Can I control and monitor the Oscal BP3600 through an app?

Yes. The BP3600 connects via WiFi and Bluetooth and is managed through the same app used for your PowerMax base station. You don't need a separate interface or app specifically for the expansion battery.

What owners say

Customer reviews

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No-risk purchase

Authorized dealer, full manufacturer warranty Every unit ships genuine from an authorized dealer, backed by the manufacturer's full warranty and factory support. No gray-market gamble.30-day returns, no restocking fees Unused and in the original packaging, returned within 30 days. We never charge a restocking fee, and approved refunds post to your original payment within 7 days.Free shipping Ships free to the contiguous United States with tracking. Freight items delivering to a home with no dock or forklift can add liftgate delivery at a flat fee shown at checkout.Arrives damaged? We cover it. If your unit shows up damaged or defective, we pay return shipping and expedite a free replacement. Send photos and we move fast.90-day price guarantee Find it lower at an authorized retailer within 90 days of your purchase and we refund the difference.Financing available Split the cost into monthly payments at checkout.Real pre- and post-sale support Questions about sizing, compatibility, or setup? Reach our team directly at info@mightygenerators.com before you buy or after your unit arrives.