Bluetti B300 Power Station Expansion Battery (3,072Wh)
Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 1Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 2Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 3Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 4Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 5Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 6Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 7Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 8Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 9Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 10Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 11Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 12Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 13Bluetti B300 Power Station Expansion Battery (3,072Wh) additional 14
4 Year Warranty

£1,662.50 ex VAT£1,995.00 inc VAT


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

The Bluetti B300 Expansion Battery (3,072Wh) is a versatile expandable power source for charging a range of devices including smartphones, laptops, fans, lights, refrigerators, microwave ovens and more, with a selection of output ports to choose from. Compatible with the Bluetti AC200MAX, AC200P or AC300 series, this expansion battery is great as a backup power source and for using as a standalone power bank for devices. Built with a reliable and long-lasting LifePO4 battery providing over 3,500 life cycles and offering up to 80% of original capacity, you can double, triple and even quadruple the total capacity with the Bluetti AC200MAX, AC200P or the AC300 series. Designed to adapt to a range of situations to provide backup power during camping trips, holidays, hiking excursions, travelling on the road, family gatherings and in the event of power outages at home.

This expansion battery also comes with flexible recharge options, allowing you to quickly replenish the B300 with 200W Max. solar input thanks to the built-in MPPT and it also supports AC, car, and lead-acid battery charging. Please note that the car and lead-acid battery charging need a D050S. With its modular design, early adopters can enjoy more capacity when it comes to old models by simply connecting up with the B300 backup battery.

Inputs available: AC Input (500W Max), Solar Input (200W Max., VOC 12-60VDC, 10A), Car Input (12/24V from Cigarette Lighter Port), Max Input (700W, With AC Adatper + Solar Input Simultaneously)

Outputs available: USB-C Port (1 x 100W Max), USB-A Port (1 x 18W USB-A), 12V DC Outlet* (1 x 12V/10A Car Outlet *All Regulated)

In The Box: B300 Battery Expansion Battery, battery expansion cable (P090A), solar charging cable (MC4 to XT90), user manual, QC card & 48-month warranty card.

  • Size: 52cm x 32cm x 26.6cm
  • Weight: 36.1Kg
  • 4-year warranty for B300, 1-year for accessories
  • Capacity: 3072Wh (51.2V, 60Ah)
  • Features a 100W USB-C, a 12V/10A car output and a USB-A ports, you can use the B300 as a portable power station
  • The smart MPPT inside of the B300 enables it to recharge quickly through solar power at a 200W maximum loading scale
  • You can also recharge it by wall socket, car charging or lead-acid battery
  • Car charging and lead-acid battery charging need to be realized through D050S

Code: B300-UN-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: