Partner Forum 2020 - Q&A

Question: What is the voltage range for the Sierra 25?
Answer: There is a Sierra in 48Vdc with 120Vac o/p for single phase or 3 phase applications. There is a Sierra in 48Vdc and another in 380Vdc with both 277Vac to build 480Vac compatible systems.

Question: How about NEBS?
Answer: There is a Sierra 25 48Vdc/277Vac in course of NEBS approval. The release is expected release after this summer.

Question: How many modules can we connect in one system?
Answer: Up to 32 modules per system and several systems can be parallelized to reach high power. Based on customer requests, we can build systems in one-phase, two-phases or three-phases and with different configurations (N+1, N+2, 2N or A+B).

Question: What happens in case of monitoring failure?
Answer: The monitoring is not a single point of failure for the solution because the control of the power converters is embedded in each power module.

Question: How operates the module that is installed for redundancy?
Answer: All modules are operating and share the loads. In case of failure of one module, the other modules will take over the power and share the loads between them.

Question: Are there any plans to provide application for automatic server shutdown as it is common for UPS solutions?
Answer: The new Inview Cloud monitoring will integrate this feature.

Question: Will the charging be compatible with Li-Ion or Super Cap?
Answer: As long as these are used within the DC voltage range of the converter, yes it is compatible.

Questions: What are the physical dimensions of the Arts battery NiMH?
Answer: The battery measures 704 x 84 x 72 mm with sleeve. Up to 6 battery pack modules can be integrated in a standard 19 inches shelf (parallel and/or series configurable).

Questions: What is the weight of the Arts 48V 6Ah module?
Answer: The battery is light as it weighs only 8.2 kg, which approximately 17lb.

Questions: What’s the difference between Li-Ion (1C) and (2C)?
Answer: What we mean here is 1C charge / discharge or 2C charge/discharge. Of course there are many Lithium techniques but we decide to just focus on LFP and NMC.

Questions: What are the different BMS that are used with batteries
Answer: Lead-Acid and NiCd use classical CCCV algorithm (constant current, constant voltage). For NiZn, we use a dedicated algorithm we build with the battery manufacturer. NiMH also use the CCCV algorithm (at least for the battery presented). Li-Ion also uses CCCV algorithms, but battery manufacturers have their own BMS.

Question: When you have several cabinets in parallel, how many Inview monitoring do you need?
Answer: If you have two systems in A + B, you will have two Inview in total. Same for 2N configuration. But if you have a large “single” system, only one Inview is needed.

Question: What data can we collect from and send to a BMS?
Answer: We can retrieve any data that are available from the battery BMS such as, but not limited, to SOC, SOH, Voltage, Current. We can also receive set point such as required charge current or voltage for proper battery management.

Questions: What are the physical dimensions of the Arts battery NiMH?
Answer: The battery measures 704 x 84 x 72 mm with sleeve. Up to 6 battery pack modules can be integrated in a standard 19 inches shelf (parallel and/or series configurable).

Questions: What is the weight of the Arts 48V 6Ah module?
Answer: The battery is light as it weighs only 8.2 kg, which approximately 17lb.

Questions: What’s the difference between Li-Ion (1C) and (2C)?
Answer: What we mean here is 1C charge / discharge or 2C charge/discharge. Of course there are many Lithium techniques but we decide to just focus on LFP and NMC.

Questions: What are the different BMS that are used with batteries
Answer: Lead-Acid and NiCd use classical CCCV algorithm (constant current, constant voltage). For NiZn, we use a dedicated algorithm we build with the battery manufacturer. NiMH also use the CCCV algorithm (at least for the battery presented). Li-Ion also uses CCCV algorithms, but battery manufacturers have their own BMS.

Question: When you have several cabinets in parallel, how many Inview monitoring do you need?
Answer: If you have two systems in A + B, you will have two Inview in total. Same for 2N configuration. But if you have a large “single” system, only one Inview is needed.

Question: What data can we collect from and send to a BMS?
Answer: We can retrieve any data that are available from the battery BMS such as, but not limited, to SOC, SOH, Voltage, Current. We can also receive set point such as required charge current or voltage for proper battery management.

Question: What is the inrush current capacity for motor starting? How should I oversize the inverter capacity and for how long?
Answer: The Stabiliti can start induction motors. However it is recommended that the motor size doesn’t exceed 30% of the total installed capacity of Stabiliti. To cope with inrush current Sierra based architectures, or combination of both, should be preferred.