Dc Connection; Possible Connection; Connection Of Two Batteries - SMA SUNNY BOY STORAGE 3.8-US Instrucciones De Instalación

SMA Solar Technology AG
7. Stick the terminal block into the slot
battery interface module in the inverter.
8. Ensure that the terminal block is securely in place.
9. Ensure that all conductors are correctly connected.
10. Ensure that the conductors sit securely in the terminal points. Tip: To release the conductors
from the terminal block, open the terminal points using a suitable tool.
11. Install switch in desired position (e.g. next to the inverter or as switch/outlet combination
optionally at short distance from the inverter (to max. 10 m (393.7 in))).
12. Connect the other end of the cable directly to the switch.
6.8

DC Connection

6.8.1

Possible Connection

The inverter includes the multi-battery function. This enables to charge and discharge several
batteries of the same or different type.
Each DC terminal is designed for a maximum charging/discharging current of 10 A. You can
choose between the following connection possibilities:
• Connection of two batteries: The first has a charging/discharging current limit of 20 A and the
second 10 A.
• Connection of one single battery with a charging/discharging current limit of 10 A.
• Connection of one single battery with a charging/discharging current limit of 20 A.
• Connection of one single battery with a charging/discharging current limit of 30 A.
• Connection of three batteries with a charging/discharging current limit of 10 A each.
In the following sections, you find detailed information as well as a wiring- and connection overview
for each connection possibility.

6.8.1.1 Connection of Two Batteries

You may connect two batteries to the inverter:
• Connection of two batteries with varying charging/discharging current limits.
• Connection of two batteries with a charging/discharging current limit of 10 A each.
Connection of two batteries with varying charging/discharging current limits.
The DC terminals A and B of the inverter are connected in parallel as standard. The parallely
connected DC terminal A/B limits the charging/discharging current to 20 A and the DC terminal C
to 10 A.
Installation Manual
on the
SBSxx-US-10-IA-xx-12
6 Electrical Connection
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