SMA HM-20 User Manual

8 Connection
SMA Solar Technology AG
Operating manual 23HM-20-BE-en-19
8 Connection
8.1 Safety during Electrical Connection
WARNING
Risk of fire due to dirty or oxidized contact surfaces of live aluminum conductors
Connecting dirty or oxidized contact surfaces with aluminum conductors reduces the ampacity of the live terminals,
thereby increasing the transition resistances. This can cause components to overheat and catch fire.
• The contact surfaces are to be cleaned, brushed, and treated with acidic and alkaline substances (e.g.
petroleum jelly or special thermal grease).
8.2 Connecting the Voltage Supply
8.2.1 Requirements for connecting the voltage supply
Requirements:
☐ The setpoints of the electric utility company must be observed.
☐ The product can be operated single-phase or three-phase. Since the product is supplied with electric current by the
screw terminal L1, at least the line conductor L1 and the neutral conductor N must be connected in order that the
SunnyHomeManager switches on.
☐ When using fine stranded conductors, bootlace ferrules must be used.
Cable requirements:
☐ Conductor cross-section for measurements up to 63A: 10mm² to 25mm²
☐ Conductor cross-section with current transformer: at least 1.5mm², for more information see recommendations of
the current transformer manufacturer

SMA HM-20 Specifications

General

Brand	SMA
Model	HM-20
Category	Measuring Instruments
Language	English