BB1248120 - 1 year warranty

BB1248120 - This model does have the reverse charging feature

They simply may have a very very minor mark on the metal, it shall be hardly noticeable. 

As a result this is very good value. 

These models are 12V / 24V input and 48V output - with reverse charging capability.

we only have 1x available, in the clearance section. 

Frequently asked questions regarding the BB1248120 | BB124865.

A common question is whether the BB1248120 is capable of charging 16 string (16S) (51.2V LiFePO4 batteries (rack style). The answer to this is absolutely yes, no issues - what the unit is made for, really.

In order to charge a 15S battery (Pylontech 48V for example) you shall require a BBR (remote) to set the charge voltage for the 15S (48.0V batteries). If the desired charge voltage is between 53.0V and 54.0V a BBR is required to change the charge voltages. There is a slight reduction in charge power, as below - depending on how low you set the charge voltage. If you set the charge voltage to 54.0V - you can get 1400W output power. 

• The BB1248120 can be used for charging 16S Lithium batteries ~1500W (at 57.6V)
  
• The BB1248120 can be used for charging 15S Lithium batteries ~1400W (at 54.0V) - BBR required
  

Remote control BBR - Optional remote

- Buck Boost design, offering high efficiency (93-95%)
- Simple installation and setup
- Current limiting 4 stage battery charger
- Lithium safe

-~20A reverse charge current to 13.3V

- Jumps Start Assistance Mode - watch video about it

- 24V to 48V
- BB1248120 - 1500W of output charging 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

BB1248120 Reverse Charging Feature.

The BB1248120 is able to charge in both directions. Provided there is over 52.8V on the leisure battery (54.0V if lithium) and the starter battery is below 26V the BB shall allow approximately 20A to flow back to the starter battery up to about 26.8V (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.

Generic Instructions:

Instructions