Huawei SUN2000-20KTL-M3 Quick Manual page 7

4.4 Installing DC Input Power Cables
1. Use the positive and negative Amphenol Helios H4 metal terminals and DC connectors
supplied with the solar inverter. Using incompatible positive and negative metal terminals
and DC connectors may result in serious consequences. The caused device damage is not
covered under any warranty.
2. For models of the crimping tool and removal wrench, use the recommended model or
contact your Amphenol dealer.
3. Ensure that the PV module output is well insulated to ground.
4. The DC input voltage of the SUN2000-20KTL-M3 shall not exceed 750V DC under any
circumstance.
5. Before installing DC input power cables, label the cable polarities to ensure correct cable
connections.
6. If a DC input power cable is reversely connected and the DC switch is turned on, do not
operate on the DC switch or the positive/negative connectors immediately. Otherwise, the
device may be damaged. The caused device damage is not covered under any warranty. Wait
until the night when solar irradiance declines and the PV string current drops to below 0.5 A.
Then set the DC switch to the OFF position, remove the positive and negative connectors, and
correct the polarity of the DC input power cable.
6