Sterling Power Products // AMPS
2025 Model 12V to 12V DC to DC Chargers 10A | 15A | 20A | 25A | 40A | 70A | 120A | 170A | 200A models + Remote Control (optional)
PRODUCT RANGE
Product Code
SKU: BB128
12V to 12V DC to DC Chargers 8A | 10A | 15A | 20A | 25A | 40A | 70A | 120A | 200A models - all items E-Marked! We can ship globally
5 Years Warranty - From 1st November 2024
To simplify navigation, we've compacted the various sections into 'reveal' sections below. Click the area you are interested in for more information.
Saturn series overview (Complete)
The Saturn series charger is a culmination of everything we've learned in our years of experience with DC/DC charging. What was once a simple idea to allow safe charging and use of a bow-thruster bank has evolved into the most reliable, stable and adaptable way of managing a DC battery circuit - including charging, maintaining and catering to even unique demands.
We're genuinely proud to reveal the Saturn series. Efficiency in the high 90 percentile, unparalleled features (bidirectionality, high efficiency, customisability, continuous running at full load even in adverse conditions), current limiting, lithium suitable- and backed up with our Sterling support. This is the next step of DC/DC charging.
Not only are we the most reliable method of safely and properly charging a lithium battery bank without wrecking your alternator- we are also heavily customisable, ensuring whatever unique battery circumstance you present to us, we're able to support.
All that and more. Some of our Saturn chargers open up capabilities you may never have even considered possible- including cross voltage charging. Our 24V output chargers (BB1224120) and our 48V output chargers (BB1248120 and BB124865) can take 12V or 24V input, ensuring the same item is more flexible than ever before.
Saturn series overview (BRIEF)
Buck Boost design, offering high efficiency (95-98%)
- Simple installation and setup
- Current limiting charger
- Lithium safe
Smart Alternator/Euro 6+ compatible
- Ignition feed or Vibration Sense modes
- 6 preset battery types
- 6 self recovering protections
- Low temperature trip for Lithium Ion batteries
Saturn series manuals (Collated is newest)
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Saturn series videos
New BB1225 - video - available now
New BB1210- video - the benefits of 10A current limiting - charging portable power banks
Saturn Series product codes and descriptions
Remote control BBR - Optional remote
- BB1240 Bidirectional w/ reverse charging and jump start assistance mode | 12V 40A (550W output power)
- BB1270 Bidirectional w/ reverse charging and jump start assistance mode | 12V 70A (930W output power)
- BB12120 Bidirectional w/ reverse charging and jump start assistance mode | 12V 120A (1620W output power)
BBW1270 - waterproof version of the BB1270 - weighs about 1KG more. Several available.
EV - Electric Vehicle Compatability - 3 reasons to install a BB instead of direct cabling / relay
Underneath the bonnet of EVs is the positive and negative 12V terminal that leads from the high V -> low V DC DC converter to the 12V battery. There is usually a 12V positive busbar and a 0V negative post. One of these positive feeds leads to the 12V battery. The 12V post that leads to the 12V battery would be where you install the BB along with the common negative post.
The high voltage to low voltage DC DC converter shall likely be itself current limiting. However, the vehicle has uses for this current, albeit, not all of this current all of the time.
Benefits of BB installation with EV
- The BB isolates the EV 12V battery from the 12V leisure battery, therefore you shall NOT drain the 12V EV battery. If you drain the 12V EV battery your EV will not start.
- The BB has a maximum current draw. A good estimate is to rate your BB to approximately 25-50% of the current rating of your DC DC converter. This allows the converter to provide the power to run your obligatory loads (steering, lights, stereo, air con etc) and surplus to go in to your 12V auxiliary battery. For example, if your converter is 190A rated, use a BB1270 - it shall provide ~60/70A to charge. If the full use of the converter is being used by all ancillaries the voltage shall drop across the 12V system and the BB shall naturally reduce performance and eventually turn off during that episode when there is a high power demand. The BB shall turn on again when the voltage climbs.
- Charging lithium batteries shall likely exceed the charge rating. If your converter is 200A rated but your lithium battery can only handle up to 100A - the converter shall try and provide 200A but the battery(s) BMS shall trip out. The benefit of the BB is that it shall reign in the current to whatever BB you choose.
- You shall get the correct charge voltages at the 12V auxiliary battery. Some DC DC converters shall sit at 14.7V all the time, which may be too high! The 2022+ Tesla Model 3 and Y have a DC DC converter that sits at 15.5V. Thus, to convert this voltage to a conventional 12V or 24V battery charging profile requires converting.
Reverse charge / Bidirectional charging / Jump start assist
The Saturn series chargers are able to charge in both directions, distributing power around your vehicle or install wherever it needs it most.
When the B side (A being traditional input, B being traditional output) is above 13.2V in the lead acid profiles, or 13.5V in the Lithium profile, the Saturn charger engages its reverse charge circuit.
This will aim to bring the input battery up to a healthy maintenance voltage of 13.4V at a current rate of about 1/3rd of the units rating.
If you have solar looking after your house battery, now you can make sure your starter is always good to go, too! This mode can be disabled, but is on as default.
This is ideal for allowing the starter battery to remain topped up when you have solar / wind / charger - charging up your leisure battery.
In the instance that your starter battery might be low one day and is refusing to kick the vehicle on... You can also engage our Jump Start Assist mode at the Saturn charger directly. This forces the reverse charge to run for 20 minutes, hopefully getting you back in action to do what you need to do for the day! Whether it be work, emergency - or maybe you just really want to get to that concert on time.. We're there to help.
Battery to Battery charger remote - BBR
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Battery to Battery Charger Remote Control - BBR PLEASE NOTE - BBR works best with brand new models in stock now (June 2022 onwards). If you have a BB1240/70/120 from before this date, you may have to send the BB back to use for latest firmware. As this is a new item, it has features that require BB firmware modifications. (Optional)
BBR comes with 4m extension cable What does the BBR offer? |
Why adjust the current limit? The default current setting for the BB range is 100% - meaning that the performance default is full power. If you wish to reduce the performance of the BB, here you can set to 85% or 65% charge rate. Examples of why you may wish to reduce performance: |
Charger specifications (more info in manual)
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BB1270 Input voltage range 9V-16V Continuous Rated output power 64A at 14.51V ~930W Continuous Rated input power 71.75A at 13.61V ~976W Quiescent current 5mA Efficiency rating 95-98% Self recovering protections: under voltage protection input over voltage protection output over voltage protection over current protection charge over temperature Operational Temperature -20 Deg C -> 60 DegC Approval CE | UKCA E-Marking 24*10R06/01*3789*00 Cooling method Thermostatically Controlled Variable low speed fan Dimensions 200mm x 130mm x 56mm Weight 1.0Kg |
BB12120 Input voltage range 9V-16V |
| BB1210 Input voltage range 9V-16V Continuous Rated output power 10A at 14.41V ~144W Continuous Rated input current 11A at 13.63V ~150W Quiescent current 5mA Efficiency rating 98% Self recovering protections: under voltage protection input over voltage protection output over voltage protection over current protection charge over temperature Operational Temperature -20 Deg C -> 60 DegC Approval CE | UKCA E-Marking 24*10R06/01*3789*00 Cooling method Thermostatically Controlled Dimensions 120mm x 130mm x 56mm Weight 0.6Kg |
| BB1225 Input voltage range 9V-16V Continuous Rated output power 24A at 14.41V ~345W Continuous Rated input current 26A at 13.68V ~355W Quiescent current 5mA Efficiency rating 98% Self recovering protections: under voltage protection input over voltage protection output over voltage protection over current protection charge over temperature Operational Temperature -20 Deg C -> 60 DegC Approval CE | UKCA E-Marking 24*10R06/01*3789*00 Cooling method Thermostatically Controlled Dimensions 120mm x 130mm x 56mm Weight 0.6Kg |
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BB1240 Input voltage range 9V-16V Continuous Rated output power 38A at 14.41V ~550W Continuous Rated input current 42A at 13.68V ~575W Quiescent current 5mA Efficiency rating 95-98% Self recovering protections: under voltage protection input over voltage protection output over voltage protection over current protection charge over temperature Operational Temperature -20 Deg C -> 60 DegC Approval CE | UKCA E-Marking 24*10R06/01*3789*00 Cooling method Thermostatically Controlled Variable low speed fan Dimensions 165mm x 130mm x 56mm Weight 0.8Kg |
FAQs
Paralleling multiple battery to battery chargers together?
There are no problems installing multiple BBs together in parallel to increase the power. For example, you can parallel a BB1240 with a BB12120 to get 160A of charge current. Likewise, BB1270 w/ BB1240 or BB12120 etc.. it does not matter.
Benefits:
1) Redundancy, having multiple DC-DC chargers can help with reduncancy. If one was to get damaged, the other BB(s) shall continue charging.
2) fine tuning the current. As each BB has 3 different power levels, adding multiple BBs together gives you 6, 9, 12 etc.. different power levels. For example, if you wanted 90A you could get a BB1270 and a BB1240 and set the power levels to 85% each via the BBR remote (to give you approximately 90A). Thus, giving you large levels of flexibily to hone in to a specific charge current.
Turning off the reverse charging feature, you can! Please watch the video
