UPS and Batteries

UPS and Batteries covers uninterruptible power supplies, replacement battery blocks and the small battery modules that hold up control system memory. Seven Star LLC supplies them from Muscat, Oman. The listing is led by APC single-phase and modular UPS units, with online systems from Vertiv and Schneider Electric, stationary and sealed lead-acid batteries from EnerSys, CSB and YUASA, and battery packs for Yokogawa and ABB control systems.

UPS types in this category

Three UPS designs appear in the product titles. Line-interactive units, such as the smaller tower models, pass conditioned mains power to the load and switch to the inverter when the supply leaves tolerance, with a short transfer time. Online double-conversion units rebuild the output continuously from the DC bus, so the load sees no transfer and is isolated from input voltage and frequency variation. Modular systems combine power modules and battery modules in one frame, which allows redundancy and later growth. Rack/tower convertible models suit control cabinets as well as server racks.

Batteries for UPS and control systems

Most small and mid-size UPS units use valve-regulated lead-acid blocks, and these wear out long before the electronics do. Battery life falls as room temperature rises, a real concern in the GCC. A replacement string should use blocks of the same voltage, capacity, terminal type and dimensions, and all blocks in a string should be changed together. DCS and controller battery packs are a different item. They are ordered strictly by the control system manufacturer’s part number.

How to specify a UPS for a quotation

State the load in VA and watts, the input and output voltage, single or three phase, the runtime required at that load, tower or rack format, and any network management card or external battery pack. For replacement batteries, send the UPS model or the markings on the existing blocks. We check the part number against the manufacturer documentation, propose the manufacturer’s successor when a model has been withdrawn, and provide the manufacturer’s datasheet on request.