EZA MBB50 User manual

DC/DC MBB 12VDC / 50-60A
Installation guide
Ref. MBB1250L
eza.fr

1
ATTENTION
Before any installation, it is required to:
1. Check the condition of the engine battery
2. For « Smart connect » installation,
a. Check the vehicle's original wiring that must be ≥ 10 mm². If it is not the case go directly
page 4: Installation Dedicated Line
b. Check that the vehicle is equipped with a coupling system if this is not the case go
directly Page 4: Installing Dedicated Line
Connection + IN and + OUT of the module:
In SMARTCONNECT mode :
The + original service line (+EBL) = +IN terminal of the module
+ service battery = +OUT terminal of the module
In DEDICATED mode :
+ engine battery = +IN terminal of the module
+ service battery = +OUT terminal of the module
Choice of operating mode:
Setting the charging mode of the LiFePo battery cell from the engine battery:
PROCEDURE :
Remove the front panel (2 screws) and slide the cover towards the rear of the module
Mode n°1 SMARTCONNECT mode 50 Amp : Intelligent charger, it can be installed on an original manufacturer’line
(in 10mm²) without the need to pull a specific load line. It then charges engine running, up to 50 Amp. Bi-directional,
it maintains the charge and floating mode when the vehicle is connected to the 110/220 volt mains. Complies with
the manufacturer's warranty conditions.
Mode n°2 DEDICATED MODE 60 Amp : In some cases, it is possible or necessary to install a dedicated charging line
in 16² or 25²:
-The diameter of the original manufacturer line is less than 10²,
-The vehicle does not have a, engine battery coupling, when the engine is running, to
power the cell of the motorhome.
-- The end user wants to recharge faster, up to 60 amp. Thus, this dedicated line will
increase the load performance, engine running, by 20% to charge up to 60 Amp.
1
2

2
IN+
OUT+
0V
D+
LED 1
LED 2
SELECTION
BUTTON
FRONT OF THE MBB
BACK OF THE MBB
INSIDE VIEW

3
1. MODE N°1 : Charge from the original 10mm2 line / Smart Connect 50A
mode (SC)
a. Connect the positive of the original line, coming from the EBL, to the IN+ terminal of the module.
b. Connect the positive of the auxiliary Lithium Battery (ENERGIE100) to the OUT+ terminal of the module.
c. Connect the negative of both, original line & lithium battery to the negative terminal of the MBB.
d. Prepare de “D+”line from the vehicle (6.35 blue faston lug) = « engine started » information. Connect the
« D+ » wire to the « D+ » terminal of the module
e. Check if the MBB setting is in the desired mode. Press the selection button on the module to check or to
change the setting.
f. To change the charging mode, if necessary, disconnect the D + from the module and follow the
instructions in nest paragraph.
g. Press on the “SELECTION” button of the module (see picture).
h. Release the SELECTION button : The state of LEDs "LED1" and "LED2" and the position of the switching relay
indicate the set mode according to the following table:
Each new pressure (2-3 seconds) on the SELECTION button will allow to change the charging mode
corresponding to the realized installation.
i. Reconnect the D+, if it was disconnected following instructions of paragraph h.
j. Start the engine to check the engine load and the engine battery coupling powering the cell of the
motorhome when the engine is running,
« BYPASS » SYSTEM
The MBB module MBB works in 2 Ways :
In « Smart Connect » mode (on the original line of the vehicle)
-If présence of D+ (engine on) = DC/DC charge from +IN to +OUT / 50A
-If cutoff of D+ (engine off) = bypass allowing the cell to be powered by the Lithium / 0-60A battery.
In dedicated line mode, the bypass is never activated. All consumers are connected directly to the battery.
Mode
LED1
LED2
Relay position
SC Mode
Red a
few
seconds
x
Left
Relay on
the left.

4
2. MODE N°2 : Dedicated line load 16mm2 (25mm2 if length over 5 meters) / dedicated
mode 60A (DM)
a. Connect the positive of the engine battery to the IN+ terminal of the MBB module
b. Connect the positive of the auxiliary Lithium Battery (ENERGIE100) to the OUT+ terminal of the module.
c. Connect the negative of both, Engine battery & auxiliary lithium battery to the negative terminal of the
MBB.
d. Prepare de “D+”line from the vehicle (6.35 blue faston lug) = « engine started » information and connect
it to the D+ terminal of the MBB module.
e. Check if the MBB setting is in the desired mode. Press the selection button on the module to check or to
change the setting.
f. To change the charging mode, if necessary, disconnect the D + from the module and follow the
instructions in next paragraph.
g. Press on the “SELECTION”button of the module (see picture).
h. Release the SELECTION button : The state of LEDs "LED1" and "LED2" and the position of the switching relay
indicate the set mode according to the following table:
Each new pressure (2-3 seconds) on the SELECTION button will allow to change the charging mode
corresponding to the realized installation.
i. Reconnect the D+, if it was disconnected following instructions of paragraph h.
j. Start the engine to check the engine load and the engine battery coupling powering the cell of the
motorhome when the engine is running,
Warning
Installation Precautions:
- It is necessary to add a circuit breaker between the + of the Lithium battery and the OUT+ of the MBB module for the
winterization of the vehicle.
- The connection of a 12VDC / 230VAC inverter must be positionned between the circuit breaker and the OUT+ of the
MBB module (because the current will be higher than 70A).
Mode
LED1
LED2
Relay Position
DM Mode
X
Red
a few
seconds
Right
Relay on
the right.

5
Diagnostic chart
Inverter DC/DC MBB 12VDC / 50-60A
Ref. MBB1250L
"SMART CONNECT" MODE
VEHICLE
D+
LED n°1
LED n°2
STATE
FONCTIONING
Not
Powered
OFF
OFF
MBB not powered
OFF
ENGINE
OFF
Absence
D+
Flashing
green
OFF
Closed Bypass Relay
MBB in service mode. The
current flows in both
directions within the limit of
50 amp (allows to power
the cell and maintain the
load function of the
original line)
ENGINE
OFF
Absence
D+
OFF
Steady red
Monitoring safety
peak current
MBB in Safety mode in the
presence of a current
higher than 50Amp
(example charger 230V /
12V too powerful). Control
the installation
ENGINE
ON
Presence
D+
Steady
green
Modulated
green
Opened Bypass relay
MBB in charge mode up to
50 amp. No supply (OUT
put). Cell of the vehicle
only supplied by the
engine battery if coupling
relay
ENGINE
ON
Presence
D+
Steady
green
Slow
flashing
green (5s)
Monitoring of
Alternator Voltage or
temperature. Open
bypass relay.
MBB in secure charge
mode. Slow charge
according to the elements
of voltage and
temperature measured. No
supply (OUT put). Cell of
the vehicle only supplied
by the engine battery if
coupling relay.
ENGINE
ON
Presence
D+
Steady
green
OFF
Floating end of
charge. Bypass relay
open.
MBB in end of cycle
charge mode. Balancing
of the cells. No supply (OUT
put). Cell of the vehicle
only supplied by the
engine battery if coupling
relay
ENGINE
ON
Presence
D+
Steady
green
Steady
green
Opened Bypass relay
MBB in standby mode.
Charge completed. No
supply (OUT put)

6
POSSIBLE MALFUNCTION
ENGINE
OFF
Absence
D+
OFF
Steady
red
Fault on OUT voltage
No battery voltage. BMS
disarmed or faulty Lifepo
Battery
ENGINE
ON
Presence
D+
Steady
red
OFF
Fault on IN voltage
Insufficient or too high
voltage.
Required Voltage:
11.8 V <T <16V.
Possible cause:
Engine battery too low
or Bad D +
ENGINE
ON
Presence
D+
Steady
red
Steady
red
Power failure
Power failure. Verify the
installation & contact after
sale service

7
"DEDICATED LINE" MODE
VEHICLE
D+
LED
n°1
LED n°2
STATE
FONCTIONING
Non
alimenté
Éteinte
Éteinte
MBB non alimenté
OFF
ENGINE
OFF
Absence
D+
Flashing
green
OFF
Opened Bypass
relay
MBB in standby mode.
Charge 0
ENGINE
ON
Presence
D+
Steady
green
Modulated
green
Opened Bypass
relay
MBB in charge mode up to
60 amp.
ENGINE
ON
Presence
D+
Steady
green
Slow
flashing
green (5s)
Monitoring of
Alternator Voltage
or temperature .
Open bypass relay.
MBB in secure charge
mode. Slow charge
according to the elements
of voltage and
temperature measured.
ENGINE
ON
Presence
D+
Steady
green
Steady
green
Floating de fin de
charge. Relais
Bypass ouvert.
MBB in end of cycle charge
mode. Balancing of the
cells.
ENGINE
ON
Presence
D+
Steady
green
Steady
green
Opened Bypass
relay
MBB in standby mode.
Charge completed.

8
POSSIBLE MALFUNCTION
ENGINE
OFF
Absence
D+
OFF
Steady
red
Fault on OUT voltage
No battery voltage. BMS
disarmed or faulty Lifepo
battery
ENGINE
ON
Presence
D+
Steady
red
OFF
Fault on IN voltage
Insufficient or too high
voltage.
Required voltage :
11,8 V < T <16V.
Possible cause :
Engine battery too low
or bad D+
ENGINE
ON
Presence
D+
Steady
red
Steady
red
Power failure
Power failure.
Verify the installation &
contact the after sale
service