SMA SI 4548-US - Manual (Page 73)

SMA America, LLC 8 Commissioning
Operating Manual SI4548-6048-US-BE-en-20 73
Make sure the insulated conductors have the correct polarity.
– BatCur+ to terminal 1
– BatCur– to terminal 2
9. Start the Sunny Island (see Section 9.1 "Switching On", page 74).
10. Check the current direction: "120.06 TotBatCur"
Current direction: Discharging the battery
• No generator/utility grid connected
• Loads are being supplied
The measured value of the battery current is positive.
Current direction: Charging the battery
• Generator/utility grid connected
• Loads are not/marginally supplied
• Battery is being charged
The measured value of the battery current is negative.