New from Relec Electronics is the SR-1600-Plus Series of DC-AC inverters from Cotek, consisting of 1600VA inverter modules for either 24V or 48V inputs, bespoke 2U subrack and a system controller. There are also options for remote control and maintenance bypass switches.
The inverters have 89–91 per cent efficiency in DC-AC mode and also provide line conditioning of the AC input supply, making them particularly suitable for use with modern IT systems where the incoming primary AC supply can be variable or non-sinusoidal, such as from a generator. Power factor is >0.99 and maximum AC efficiency is 95 per cent. The SR-1600-Plus series can be used as a DC-AC inverter, where the input source is a DC or battery supply, and also as AC mode with DC back up with zero transfer time. The inverters can also power share between the AC and DC sources. To ensure reliable operation, the SR-1600-Plus Series accepts a wide range of AC inputs (minimum +/- 20 per cent) and delivers a regulated, adjustable AC output (+/- 2 per cent). The inverters can also split the load between the AC and DC input source. This is particularly suitable for renewable energy applications, where DC supply is not available all the time, or to take advantage of low tariff AC sources.
In addition to SNMP (simple network management protocol), an RS-485 Modbus port in the SR-1600-Plus rack allows users to control and monitor key parameters, such as voltage, output power, internal temperature and protection levels. Although primarily designed for use with a bespoke 2U subrack, the SR-1600-Plus inverters may be used as standalone units. Blanking panels support unpopulated slots, which can be used for expansion at a later date, as required. Subracks can be supplied with the SN-1 Plus interface for Ethernet support, or CR-21 for programming at a local level. The SR-2U2-Plus subrack can accommodate up to four SR-1600-Plus modules, providing between 1600VA and 6400VA outputs, with options for redundancy and upgrades. The overall system is scalable with up to eight subracks, or 32 modules connected in parallel capable of supplying up to 51.2kVA. Each DC-AC inverter has a footprint of just 105 × 83 × 405mm, operating from a 2U × 509mm subrack. All units are 100 per cent ‘hot swappable’ in live systems for uninterrupted operation in sensitive systems during maintenance and system upgrades.
For more information about the SR-1600-Plus Series of DC-AC inverters please visit www.relec.co.uk.