Free Shipping In The USA | Call Us:  877-556-3347 

Free Shipping In The USA | Call Us:  877-556-3347 

Skip to content

Oscal BP3600 Extra Battery | Enhanced Power for PowerMax 3600 & 6000 Power Stations image gallery

Product image 1 of 3

Oscal BP3600 Extra Battery | Enhanced Power for PowerMax 3600 & 6000 Power Stations Solar Generator Expansion Batteries Oscal

Oscal BP3600 Extra Battery | Enhanced Power for PowerMax 3600 & 6000 Power Stations

BY: Oscal
SKU: BP3600
| Availability: Out of stock
$1,399.00
$1,099.00
Sold out

Notify me when back in stock

Product Highlights

  • Built for home backup, off-grid power, and RV travel
  • 3,600 Wh capacity for extended backup and off-grid runtime
  • Expandable design lets stored power grow with future needs
  • Remote monitoring makes power and settings easy to track

Found A Better Price?

Share it with us now and we will beat it.
Get the best deal online, guaranteed!

Contact Us: 877-556-3347
Live Chat With an Expert

Estimated Delivery Between

and .

Order within to get it by the earliest date.

Order within
to get it by the earliest date.

Not Sure This Is The Right System?

Request a Free Solar Proposal
Authorized Oscal Dealer
Free & Fast Shipping From US Warehouses
Easy 30-Day Returns & Price Beat Guarantee
Lifetime Expert Support

Shipping & Easy Returns

Shipping is free across the Lower 48. No fuel surcharges, no residential fees, and no liftgate charge on freight orders. The price you see is the price you pay. Read our full Shipping Policy here.

Most orders leave the warehouse in 1 to 2 business days and arrive within 3 to 10 business days. We send tracking the moment it ships.

Anything that ships on a pallet goes freight with liftgate and pallet jack included, so the driver gets it off the truck and onto the ground at your address. The carrier will call you directly to schedule a delivery window.

Returns are 30 days from delivery. For freight deliveries, inspect the shipment before you sign for it. If something is damaged in transit, note it on the delivery receipt and we handle the freight claim, not you. Read more about our Returns Policy here.

Why Buy From Us

Buying solar online should not mean guessing your way through the install. Here’s what you get with Off-Grid Source.

  • We size the system, not just sell it. Call before you order and a sales engineer will check the kit against your actual loads, tell you if you’re buying too much or too little, and list the site-specific parts your install will need.

  • A+ rated by the Better Business Bureau. Another trust signal that you’re buying from a real company that stands behind the sale.

  • Free shipping across the Lower 48. No hidden freight charges, residential fees, or liftgate surprises at checkout.

  • Guaranteed best prices. Find the same product for less elsewhere and we’ll match it.

  • 30-day easy returns. If it is not the right fit, we’ll help you get it sent back.

  • A real person on the phone. Product questions, sizing, install planning, warranty help: call us at +1 (877) 556-3347.
  • 5 stars: 2 (67%)
  • 4 stars: 1 (33%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
M
MARTIN BRADY
I received it with a 52% charge

I received it with a 52% charge, and I hooked it up to the main unit to fully charge it, but it only charges to 96%, not 100%. What's up with that?

A
Anonymous
I am very happy with my extra battery

I am very happy with my extra battery. I haven't been able to run it through any paces.
But what I've seen so far, it seems to be functioning properly.

A
Anonymous
Review of BP3600 expansion battery

I bought the PowerMax 6000 back in October of 2025 it's worked great.So I went with the BP3600 battery so so good !

Why Choose Off Grid Source

FAST & FREE SHIPPING

FAST & FREE SHIPPING

From US-Based Warehouse

30-DAYS EASY RETURNS

30-DAYS EASY RETURNS

Yes, Really.

GUARANTEED BEST PRICES

GUARANTEED BEST PRICES

Find a Better Price? We’ll Match It.

GREAT CUSTOMER SERVICE

GREAT CUSTOMER SERVICE

Call Us: (+1) 877-556-3347

You May Also Like

Our Customers Tell It Better Than We Do

Excellent 4.9/5

Trusted By 10,000+ Customers. See All Reviews.

They Stood By Me

I was a DIY solar power wannabe... that is 'til I connected with Manny... The man's a prince! He not only knows his stuff; he walked me through all things electrical. To make sure I had all I needed... he gave me his cell phone # to text him anytime I got confused... nights and weekends included. The prices were very competitive... definitely go with Manny -- you won't go wrong!

Bruce D.

Awesome Service!

I am always hesitant to buy things at places I have never shopped... I want to give a shout out to Manny who with great patience and knowledge helped me get my orders... I felt valued as a customer and I will definitely be back in the future. I highly recommend them, they make you feel like family.

Jennene A.

Real Person, Honest Service.

I'm about to go off grid. I called Manny, he walked me through everything so I could truly understand what I needed and never tried to upsell me. He was honest and made a customer for life.

Ray B.

Easy Return

I would personally like to thank Manny... I purchased the inverter and decided I needed to return it... Manny was very understanding and went out of his way to help me return the product and not even have to pay for shipping return. He gives this company reputation, honor and quality customer service!

Roger V.

Totally Off Grid.

I have been talking with Manny the owner... He has not only helped me design a system but he's been assisting with the install and components. I am super pleased so far with the assistance.

Jeff S.

Great Product! Fast Shipping

We added 2 more batteries to our current set up. Pleased with the customer service from Off-Grid Source! Will be back!

Jason

Excellent Customer Service

Very fast response times. Very professional. I highly recommend!

Ray W.