Bluetti B300S Expansion Battery For AC500 (3072Wh)
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4 Year Warranty

£1,916.66 ex VAT£2,299.99 inc VAT


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Delivery within 3-4 Working Days. Please contact us for Same Day Delivery options.

Please Note: This expansion battery only works with the Bluetti AC500 5,000W AC Pure Sine Wave Inverter, available at Eco Wizard.

The Bluetti B300S Expansion Battery (3072Wh) is an expandable battery backup designed to work only with the Bluetti AC500 5,000W AC Pure Sine Wave Inverter. You can plug in up to 6 B300S packs with the AC500, and you'll enjoy 18,432Wh of heavy duty power which is enough to power up your RV while you're on the road, charge devices while you're living off-grid and keep things running during a home power outage. The B300S has an impressive 3,072Wh capacity and lasts 3,500+ cycles to 80% of its original capacity thanks to the safe, reliable and long-lasting LiFePO4 battery.

Fully charges in less than 1 hour with a maximum 4,500W input (dual recharging by solar and grid). In a lunch break, you'll be able to easily recharge your AC500 & B300S to full power and you can even tie the AC500 and B300S system to the grid to power your entire home when a blackout occurs. Please note the UPS power system should be installed by a licensed electrician.

Inputs available:  AC Input (500W Max.), Solar Input (500W Max., VOC 12-60VDC, 10A), Car Input (12/24V from Cigarette Lighter Port), Maximum Input (1,000W, with D050S DC Charging Enhancer).

Outputs available: USB-C Port (1 x 100W Max), USB-A Port (1 x 18W), DC Outlets* (1 x 12V Car Outlet) *All regulated.

In The Box: B300S Expansion Battery, battery expansion cable (P150D), solar charging cable (MC4 to XT90), user manual, certificate card & warranty card.

  • Weight: 36.1kg
  • Size: 52cm x 32cm x 26.6cm
  • Capacity: 3,072Wh (51.2V, 60Ah)
  • Safe & reliable LFP battery with 3,500+ life cycles
  • Standalone power station with 100W USB-C, 12V/10A car port and USB-A port
  • Flexible charging via AC, solar and car power sources
  • Responsive even on freezing days with Self-heating Function
  • Compatible with AC500 for a maximum of 18,432Wh capacity.​(AC500+6*B300S)

Code: B300S-EU-GY-BL-00

Delivery Policy

Last updated 14th December, 2023

This Shipping & Delivery Policy is part of our Terms of Service ("Terms") and should be therefore read alongside our main Terms:

Please carefully review our Shipping & Delivery Policy when purchasing our products. This policy will apply to any order you place with us.

What are my Shipping & Delivery Options?

We offer various shipping options. In some cases a third-party supplier may be managing our inventory and will be responsible for shipping your products.

FREE Shipping

We offer FREE 2-3 working day delivery on all orders over £99 received before 4pm. All orders placed under £99 are charged at £4.95 (£4.13 ExVAT).

For Portable Power please allow up to 4 working days for delivery and Solar Panels are shipped via our pallet delivery service which is a £100.

Next Day Delivery

We also offer Next Working Day Delivery on all orders received before 2pm. Once again, all orders placed after 2pm on a Friday and at the weekend will be processed on Monday and then sent out for Next Working Day Delivery.

Northern Ireland, Highlands & Channel Islands 

Please contact us for our shipping rates to Northern Ireland, Scottish Highlands & Channel Islands.

Please note; we can't currently ship portable power items to Northern Ireland due to insurance issues with the courier.

Do you deliver Internationally?

We do not offer international shipping.

What happens if my order is delayed?

If delivery is delayed for any reason we will let you know as soon as possible and will advise you of a revised estimated date for delivery.

For EU and UK consumers: This does not affect your statutory rights. For more information please refer to our Terms.

Questions about Returns?

If you have questions about returns, please review our Return Policy:

How can you contact us about our Delivery?

If you have any further questions or comments, you may contact us by:

  • Email:


Last updated May 23, 2024

Thank you for your purchase, we hope you are happy with it.

However, if you are not completely satisfied with your purchase for any reason, you may return it to us for a full refund, store credit, or an exchange; please see below for more information on our returns policy.


If you find you have received the wrong or damaged item(s), you need to contact us within 7 days of receipt of goods. Any time after this you are responsible for returning the goods at your own cost following the standard returns process.
All returns must be postmarked within thirty (30) days of the purchase date. All returned items must be in new and unused condition, with all original tags and labels attached.


To return an item, please click the ‘Download Returns Form’ below and complete all data fields. You can then email this to our team once completed.
Place your item(s) securely in its original packaging along with the returns form.
Please note that the RMA# on the returns address is your original order number; please ensure to reference this on the returns address, as per below.
You are now ready to mail your return to the following address:

Attn: Returns
RMA #/Order No -
Eco WizardUnderfloor Wizard Ltd t/a ECO Wizard
Beechfield House
Winterton Way
SK11 0LP
United Kingdom

We ask that all customers when returning products send the goods via a trackable courier service. Underfloor Wizard Ltd t/a ECO Wizard will not be held responsible for goods which do not arrive at our premises.

Please note, you will be responsible for all return shipping charges, unless in the instance of damaged/faulty goods received in which case we can issue you with a returns label to cover the cost of postage.

Download Returns Form


After receiving your return and inspecting the condition of your item, we will process your return or exchange. Please allow at least seven (7) days from the receipt of your item to process your return or exchange. Refunds may take 1-2 billing cycles to appear on your credit card statement, depending on your credit card company. We will notify you by email when your return has been processed.


The following items cannot be returned or exchanged:

  • opened box, damaged, missing or incomplete items cannot be returned.
  • items that have been installed.


If you have any questions concerning our return policy, please contact us at: