2022 Model 12V to 12V DC to DC Chargers 40A | 70A | 120A models + Remote Control (optional)

£359.99

12V to 12V DC to DC Chargers 40A | 70A | 120A models - E-Marking

70A and 120A models available now.

BB1240 on pre-order est. Q1 2023.

We can ship to the USA

Remote control BBR - Optional remote

- Buck Boost design, offering high efficiency (95-98%)
- Simple installation and setup
- Current limiting charger
- Lithium safe
- BB1240 Bidirectional | 12V 40A (550W output power)
- BB1270 | 12V 70A (930W output power)
- BB12120 | 12V 120A (1620W output power)

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

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!

 

BB1240 Reverse Charging Feature.

The BB1240 is able to charge in both directions. Provided there is over 13.2V on the leisure battery (13.5V if lithium) and the starter battery is below 13V the BB shall allow approximately half current (~20A) to flow back to the starter battery up to about 13.4V (float voltage). It simply allows the starter battery to remain topped up when there is surplus energy in the domestic battery. This feature will NOT drain your domestic battery - it simply takes surplus. Once your alternator / engine turns on or you provide the BB with an ignition signal the BB reverts to normal charging of the leisure battery.  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.

 

 

Instructions / Information pack BB1270

Instructions / Information pack BB12120

 

Instructions / Information pack BB1240

 

 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 3m extension cable

What does the BBR offer?
- Live voltage and current readings from BB output
- Ability to set custom charge profiles | absorption, float and absorption time length
- Ability to adjust current limit to 85%, 65% or full power (100%)
- Allows the removal of float voltage feature in lithium profiles
- Desulphation / equilisation settings can be set in LEAD modes.

 

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:
1) if you have solar panels and the weather is good, by reducing the power of the BB, you shall conserve fuel.
2) The alternator is better suited running at slightly lower current than what was expected.
3) It may be recommended by your battery supplier to charge the battery up at a slightly lower current. If one of your lithium batteries within your leisure battery bank fails, you may be exceeding the C rating of the remaining batteries.
4) future proofing. If you have installed a high powered BB, in the assumption that one day you shall put a larger alternator on and/or more batteries in your system. You can reduce the power for the immediate install and increase the performance of the unit at a later date.

 Instructions

 

E24 - BB1270 - E-Marking certificate

 

E24 - BB12120 - E-Marking certificate

 

 

E24 - BB1240 - E-marking certificate

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
Continuous Rated output power        112A at 14.41V ~1610W
Continuous Rated input power  123A at 13.68V ~1680W
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 E24*10R06/01*3790*00
Cooling method            Thermostatically Controlled
                Variable low speed fan

Dimensions            270mm x 130mm x 73mm
Weight                1.8Kg

 

 

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            150mm x 130mm x 56mm
Weight                0.8Kg

 

 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.