Installation; Location; Battery Cables And Battery Fuse - Victron energy BlueSolar MPPT 150/70 User Manual

At a voltage >75 V, particularly with regard to the open circuit voltage of the PV array, the solar
system must be installed according to protection class II. A chassis grounding point is located on the
outside of the product. If it can be assumed that the grounding protection is damaged, the product
should be taken out of operation and prevented from accidentally being put into operation again;
contact qualified maintenance personnel.
Ensure that the connection cables are provided with fuses or circuit breakers. Never replace a
protective device by a component of a different type. Refer to the manual for the correct part.
Connections must always be made in the sequence described in section 4

3. INSTALLATION

This product may only be installed by a qualified electrical engineer.

3.1 Location

The product must be installed in a dry and well-ventilated area, as close as possible to - but not above
- the batteries. There should be a clear space of at least 10 cm around the product for cooling.
The charge controller is intended for wall mounting. For mounting purposes, a hook and two holes are
provided at the back of the casing (see appendix G).

3.2 Battery cables and battery fuse

Do not invert the plus and minus battery connection: this will permanently damage the
charger.
In order to utilize the full capacity of the product, battery cables with sufficient cross section and a fuse
of sufficient current rating should be used.
Some basic formulas for copper cable:
Resistance R (m @47° C) of a cable with length L (m) and cross section A (mm²):
c
Or, with R in (Ohm):
c
Power loss P (W) in a cable carrying current I (A):
c
Power loss P relative to solar array output P
c
Cable cross section required to limit relative power loss to α (%):
(with total cable length 2L)
2
in %:
v
R = 20*L/A
c
R =0,02*L/A
c
P = I²*R = 0,02*l²*L/A
c c
α = (P /P )*100
c v
A = 2*2L*I/(α*V)
or:
A = 2*2L*P /(α*V²)
v
(1)
(2)
(3)
(4)
(5)
(6)