DC charging systems
Direct Current (DC) That's what a battery provides - DC Power. DC chargers use battery power to recharge other batteries. Examples of this would be using a start battery to charge a house/service battery. Or more specifically the vehicle's alternator which charges the start battery, but then the DC charger amplifies the voltage to provide the correct voltage to the house battery which might also be a different type of battery to the start battery. For instance, a start battery that a wet cell can happily charge at 13.5 volts but a much larger house battery that's an AGM technology might require 14.7v for a much longer period than what an alternator will maintain a steady 13.5 volts for.
That is why we need DC charging systems or DC to DC chargers these days with modern vehicles because a vehicle's alternator doesn't operate as it used to 20 years ago and it's even more important with Euro 5 & Euro 6 vehicles.
- Description
- Specifications
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12V to 12V DC to DC Chargers 70A
- Buck Boost design, offering high efficiency (95-98%)
- Simple installation and setup
- Current limiting charger
- Lithium safe
- BB1270 | 12V 70A (930W 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!
Remote control BBR - Optional remote