Sterling BB1230 'Pro Batt Ultra' Battery-To-Battery Charger - 12V/12V 30A

  (11 Reviews)
Price:  £192.08   (£160.07 Exc. VAT)

Product code:  P01454
Brand:  Sterling Power



8 in stock

Note: Cables not included. Please download installation instructions to determine correct cable size and fuses for your application.

The Sterling 'Pro Batt Ultra' 12V/12V 30A BB1230 Battery-To-Battery charger offers fast, multi-stage charging of auxiliary batteries in automotive, marine and recreational vehicle applications.  Simple to install and configure, it provides a much deeper and faster re-charge than connecting directly to the alternator and is essential if you intend to re-charge a second battery in a modern vehicle where the introduction of  'smart' alternators has rendered traditional voltage sensitive relays (VSRs) redundant (please see download section below for more info).

Smart alternators are ECU controlled and their voltage output varies continuously throughout a journey. Often the voltage is too low to provide any charge to the batteries via a VSR and at other times the voltage is very high (with regenerative braking systems) which can damage sealed, AGM & Gel batteries.

Sterling Battery-To-Battery chargers take the variable voltage output from the alternator and boost or reduce it to maintain a stable voltage output according to a multi-stage charging profile, providing a safe, controlled and fast charge for your auxiliary battery. Another benefit is that current flow is limited by the charger's current rating, eliminating potentially damaging high in-rush currents to deeply discharged batteries and allowing the use of smaller connecting cable compared with VSR split charge systems (which need to handle the max. alternator output).  Importantly, once the engine is turned off the charger automatically isolates the starter and leisure batteries from each other to prevent accidental discharge.

Compatible with the following manufacturer's technologies plus many other Euro 5/6 + vehicles that use smart alternators & regenerative braking.

® Trademark of Mercedes Benz ® Trademark of Volkswagen ® Trademark of Vauxhall ® Trademark of Ford


  • Suitable for all battery types (wet lead acid open and sealed, AGM, gel, lithium and calcium).
  • No connection to alternator required (no warranty issues)
  • No adverse effect on ECU
  • Around 5x faster charging than traditional split charge systems
  • Multi-stage profile for a deep charge and long battery life
  • Solves Euro 5/6+ smart alternator and regenerative braking issues that make VSRs redundant
  • Input voltage boost/reduction for stable and correct charging profile
  • Automatic battery isolation/separation with engine off
  • 9 preset battery chemistry options to suit all battery types, plus user-customisable profile
  • Comprehensive front panel display
  • Quick and simple to install - cables not included
  • Dynamic thermal charging via IP68 waterproof temperature sensor (included)
  • Night time setting for silent running (no fan) at 50% power
  • Fire-proof plastic enclosure
  • Designed in the UK

Further info

We recommend this 30A charger for use in the majority of campervan and motorhome applications that have a leisure battery (or bank of batteries) up to around 300Ah in capacity.  For larger battery banks and/or faster charge rates, consider the 60A model.

  • Input nominal system voltage: 12V DC
  • Output nominal system voltage: 12V DC
  • Current limit: 30A (output limited to this value, input unlimited)
  • Voltage output: Variable dependent on selected charging profile
  • Cooling method: Variable speed fan
  • Cable connection: Screw clamp terminals (max. cable size 16mm2)
  • Ingress Protection rating: IP21 (drip proof - when mounted vertically) 
  • Weight: 1.4kg
  • Overall dimensions: 198 (H) x164 (W) x 71 (D) mm
  • Fixing hole dia: 4.5mm
  • Conforms to the following standards: E-Marked (suitable for OEM fitting)

Part Number:  BB1230

Average Rating (11 Reviews):  
Write a Review and share your opinions!

Dc to dc
Thursday, 20 May 2021  | 

Easy to fit works like it should iv now had 2 of these been very good with no issues

No Problems so far
Monday, 21 September 2020  | 

Seems like a good product. Everything works straight out of the box just like the comprehensive instructions suggest.

Good unit let down by the manual
Wednesday, 27 May 2020  | 

Let me start by saying that this seems to be a perfectly good charger. It does its job, and it runs quietly and (so far at least) reliably. I would have given it 5 stars, but...

The UI and the manual! The first impression of the manual is that it's one of those which has been translated from a foreign language by a non-native English speaker, but on further study I don't think that's right. It's just been written by someone who brain-dumps
without reading it back and has a slightly odd writing style. It consistently uses the word "shall" when it means "will" (the two are not synonyms) and "alternatively" when it means "alternately". The biggest problem though is that it relies very much on you knowing what the author was thinking when he or she wrote it. The information isn't provided in any kind of structured way but just as a stream of the writer's consciousness. So much crucial information is left out that a lot of guesswork is involved in learning how to drive the unit.

The front panel user interface is of the same style - loads and loads of LEDs with cryptic annotations. Much work is required to discover what it's trying to tell you. Some of the LEDs aren't explained at all - cryptically labelled, but not explained.

Both manual and front panel have a really cramped appearance - as if someone was desperately trying to fit too much information into too little space. The manual needs a good editor to pull it apart, quiz the developers to fill in the lacunae, rearrange it in a way
that explains the principles of the device, then polish it to a readable form.

The unit would be much better with a small LCD display on the front to replace almost all the LEDs, and two to four navigation buttons.

To its credit, it does work satisfactorily just straight out of the box. Wire it up, turn it on and it works. The default settings are satisfactory for most installations, and if you're happy to treat it as an impenetrable black box then it's fine. I prefer to have a bit more understanding of what's going on though, and that's where it falls down. To get 5 stars the unit would need either a well-designed UI or a decent manual - currently it has neither.

I would offer to write them a decent manual, provided I could have access to someone who could answer all the questions which the current one leaves unanswered.

B to B 30 amp battery charger
Monday, 11 May 2020  | 

Very good service my questions were answered very well however I found the instructions a bit sketchy to follow so I went on YouTube and watched the video and found that a lot easier to follow itís only been 3 days since I have used my vehicle and it started with no problem Good piece of kit I would recommend

Far better than split charge relay
Wednesday, 27 November 2019  | 

Fantastic product easy to install

Good product and great service
Thursday, 22 March 2018  | 

As title says a really good quality product which was delivered the next day and via the very user friendly website.

Battery supercharged
Tuesday, 30 January 2018  | 

Awesome product. I was struggling to keep my batteries over 12.3 volts (about 60%) with my normal vsr/alternator. After installing this product it really supercharged my batteries 30 mins to an hour for almost fully charged now. It even charges whilst just sitting with the engine on no need to drive around to charge up.

Sterling pro battery charger
Monday, 27 November 2017  | 

Great delivery , product as expected

Pro Batt Ultra
Wednesday, 28 December 2016  | 

I didn't know much about these and have had someone else fit. Seems to work perfectly but the service was excellent. Really took the time to explain things and delivery was quick. Thanks!

Pro Batt Ultra Charger
Friday, 2 December 2016  | 

Looks a nice piece of kit, not fitted yet,(will update at that point.) Delivery and service top notch.

Read all 11 customer reviews...

Sterling Power

Sterling Power Products is at the forefront of battery charging and power management technology for both the professional and recreational consumer, with many yearsí experience. Providing a vast range of products and solutions, this UK-based company uses its award-winning charging technology to minimise re-charge times and maximise service life by ensuring the optimum charging profiles for your battery system. Sterling Power Products is an extremely well known and trusted brand within the marine electronics market and offers a large range of DC-DC charging solutions for the automotive sector.

Business Hours: Mon - Fri | 9am - 5pm
CALL Sales & Support: 01844 885100
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