Electrical Connections; Connect The Mppt Control Display - Victron energy BlueSolar MPPT 75/10 Manual

A separate ground path for the chassis ground is permitted because the chassis is isolated from the positive and the negative
terminals.
PV array grounding
The positive and negative of the PV array should not be grounded.
Ground the frame of the PV panels to reduce the impact of lightning.
Do not connect the solar charger to a grounded PV array. Only on ground connection is allowed, and this should be near the
battery.
Ground fault detection
The solar charger does not have internal ground fault protection.
The USA National Electrical Code (NEC) requires the use of an external ground fault protection device (GFPD).
The system electrical negative should be bonded through a GFPD to earth ground at one (and only one) location.
When a ground fault is indicated, battery terminals and connected circuits may be un-grounded and
hazardous.

4.5. Electrical connections

Make all electrical connections in the following order:
• Turn off all DC loads, then connect the loads to the load output of the solar charger. Torque moment 0.75Nm.
• Confirm correct battery polarity, then connect the battery (this will allow the solar charger to recognize the system voltage).
Torque moment 0.75Nm.
• Connect the VE.Direct communication cable (if applicable).
• Confirm correct PV polarity, then connect the solar array.
Torque moment 0.75Nm
If accidentally connected in reverse polarity, the PV voltage will drop and the controller will heat up but will not charge the
battery.
• In case a MPPT WireBox is used:
First: Secure all electrical cables as indicated in the WireBox installation instructions
Then: Place the WireBox plastic cover over the solar charger connection area and secure it.
See below figure for an example of the solar charger connections:

4.6. Connect the MPPT Control display

Connect the (optional) MPPT Control display to the VE.Direct port of the solar charger using a VE.Direct cable.
Note that it is not possible to extend the VE.Direct cable, the maximum length can not exceed 10 meter.
For more information, see the MPPT Control display manual
Page 12
MPPT solar charger manual
DC loads
Installation