Connecting The Power Cable Of The Battery - SMA SUNNY BOY 3.8-US Instructions D'installation

SMA Solar Technology America LLC
Requirements on･the DC conductors:
☐ The maximum permitted temperature for the fuses of the DC connection of 105°C (221°F)
must be observed.
☐ All electrical installations must be carried out in accordance with the local standards and the
National Electrical Code
☐ Conductor type: copper wire
☐ Maximum permissible conductor temperature class: 75°C (+167°F) or 90°C (194°F)
☐ The conductors must be made of solid wire, stranded wire or fine stranded wire. When using
fine stranded wire, bootlace ferrules must be used.
☐ Conductor cross-section: 2.5 mm² to 10 mm² (14 AWG to 8 AWG)
☐ Maximum length of conductors: 10 m (33 ft)
6.8.2

Connecting the power cable of the battery

This section describes the connection of a battery rated for a maximum charge/discharge current of
the inverter of 20 A and a battery rated for a maximum charge/discharge current of the inverter of
10 A.
Input A/B, connected in parallel, is provided for the connection of a battery rated for a maximum
charge/discharge current of the inverter of 20°A. Input C is provided for the connection of a
battery rated for a maximum charge/discharge current of the inverter of 10°A.
If you would like to connect just one one battery, rated for a maximum charge/discharge current of
the inverter of 10 A, and you would like to use the black start function, the battery must be
connected at input A/B and the input A/B and input C fuses must be swapped over.
Danger to life from electric shock due to live DC cables at the battery.
The DC cables connected to a battery may be live. Touching the DC conductors or the live
components leads to lethal electric shocks.
• Ensure that the inverter is disconnected from all voltage sources.
• Do not touch non-insulated cable ends.
Procedure:
1. Remove the adhesive tape from the enclosure opening for the DC connection and, if other
enclosure openings are to be used, take the sealing plugs out of these enclosure openings.
2. Insert the conduit fitting into the opening and tighten from the inside using the counter nut.
3. Attach the conduit to the conduit fitting.
4. If a battery rated for a maximum charge/discharge current of 10 A is to be connected at input
A/B, swap over the input C fuses and the input A/B fuses and make a note of this changeover
(e.g. on the label under the fuses).
5. Guide the conductors from the conduit into the inverter. In the process, install the conductors in
the inverter such that they do not come into contact with communication cables, the cable of
the LED assembly or other live conductors. Lay the conductors as a loop if they are too long.
6. Strip off the conductor insulation.
Installation Manual
®
ANSI/NFPA 70 or the Canadian Electrical Code
DANGER
6 Electrical Connection
®
CSA C22.1.
SBSxx-US-10-IA-xx-11 47