1. Q: What is the 2s backflow prevention function? Is it a globally unified requirement?
A: When electrical appliances cannot consume all the energy generated by PV systems, electric energy is fed into the power grid. When the capacity of the upper-level transformer of the grid connection point is limited or the local policy does not allow grid connection with feed-in power, backflow prevention function is required. The 2s backflow prevention function means that the function is implemented within 2 seconds. The 2s backflow prevention function (also named as zero power grid-tied feature) mainly applies to self-use scenarios. The SmartLogger detects the active power of meters at grid-tied points and controls the active power output of the inverter in a closed-loop manner to prevent the inverter output power from being transmitted to the power grid. In addition, the inverter generates more power for local load consumption to the maximum extent.
2. Q: Does a parallel C&I ESS system contain no more than 4 ESSs?
A: ESS-only scenario: The C&I ESS supports a maximum of 20 devices to be connected in parallel. PV+ESS scenario: The ESS supports a maximum of 20 ESSs and 30 inverters to be connected in parallel.
3. Q: Is an isolation transformer required when the ESS or PV+ESS system is configured in the maximum self-consumption mode?
A: No isolation transformer is required in the on-grid scenario. Please note that in case of ESS is connected with third-party inverters, the isolation transformer is still needed.
4. Q: What are the requirements on the power supply of auxiliary devices of C&I ESSs?
A: Independent mains is the first choice for the auxiliary power supply of battery cabinets, and the single-phase 220 V power on the 400 V AC bus power supply is the second choice. Obtaining power from the AC side of the PV system is prohibited.
1. Q: What are the battery storage requirements of LUNA2000-200KWH-2H1?
A: Please protect batteries from rain. Place batteries correctly according to the signs on the packing case during storage. Do not place batteries upside down or on the side, or tilt them. Stack batteries in accordance with the stacking requirements on the packing cases. Keep batteries away from heat sources and flammable and explosive materials. For details, see the user manual .
1. Q: What are the functions of the UPS in the off-grid scenario?
A: The UPS supplies power to the monitoring system, including the SACU, microgrid controller, and internal monitoring system of the battery cabinet, to ensure power supply continuity for the monitoring system during system fault ride-through and transient power outage.
2. Q: Does the C&I ESS support remote black start?
A: Black start can be initiated remotely by the EMS. The monitoring system is powered by the UPS, and the EMS determines the system status. If black start conditions are met, the EMS instructs the SmartLogger to initiate black start.
