Address the enclosure before the battery. VRLA loses roughly 50% of life expectancy per 10 °C sustained above 20 °C, and once heat has damaged a battery the capacity does not come back. In practical order of effect: Measure the internal enclosure temperature in summer, at the terminals. Not the ambient air. Specify temperature-compensated charging. […]
Less than people expect, which is why they are well suited to small pre-engineered systems. Typical measured continuous loads: SCADA, RTU and telemetry panels 80–280 W; communications, GRN and PSN repeaters 100–200 W; cameras and access control 50–150 W. At those loads a 5–15 kWh storage system with a modest array delivers days of autonomy. […]
Yes, a towable stand-alone power system is designed for it. V-Trail is deployed in minutes rather than days, needs no civil works, runs on solar with a diesel generator as backup, and can be recovered and redeployed to the next location. For a shutdown it means temporary power that arrives before the contractors do; for […]
Mostly through reduced manual handling and fewer site visits. Manual handling of large lead-acid monoblocs is a recognised musculoskeletal injury exposure for maintenance crews, and a lithium bank of equivalent usable energy is a fraction of the weight and volume. Front terminal formats remove reaching across live terminals on upper tiers. And maintenance-free or very-low-maintenance […]
A structured programme rather than an inspection habit. A register of installed batteries with date codes captured at installation. Condition testing on a schedule, impedance trending as the routine tool, with a capacity test at a defined interval or when the trend crosses a threshold, remembering that impedance indicates trend rather than measuring capacity. State […]
Increasingly LiFePOâ‚„, and specified explicitly rather than permitted. TMR’s MRTS213 requires LiFePOâ‚„ with a minimum 10-year life, 4 hours at 1400 W, maximum 80% depth of discharge, 4-hour recharge from maximum DoD, in multiple parallel strings, rack mounted. NZTA permits lead-acid or LiFePOâ‚„ with minimum service lives of 5 and 10 years respectively. Main Roads […]
More than most people specify, and it usually matters more than the battery choice. TMR’s MRTS213 requires an IP-rated double-skinned enclosure with ventilation slots, thermostatically controlled fans and a heater, white (N14) heat-reflective paint to AS 2700, and an internal temperature held between 0 °C and 50 °C, with batteries low, controller above and switchboard […]
Those are the two ends of the same specification and both have to be answered. NZTA states it directly: required battery backup times “shall be met at a temperature of 0 degrees Celsius”, with reduced autonomy acceptable below that. At the hot end, TMR’s 50 °C internal maximum is the design ceiling. LiFePOâ‚„ handles both […]
This is now an explicit requirement in the better specifications and it is worth insisting on. NZTA requires that “replacement of any string shall not require removal of the complete UPS or other strings”, with plug-and-socket DC connections and Anderson-type connectors. TMR requires multiple parallel strings, rack mounted, which supports the same outcome. For a […]
The bar has moved. Main Roads WA requires RS232/RS485 and Ethernet with an industry standard protocol, full web-server management over a secure connection, SNMP v2 or better, non-volatile logging with encrypted credentials, and a front panel displaying battery voltage, charge and discharge current and remaining autonomy time. NZTA now requires SNMPv3, ideally with DHCP, plus […]
Each authority runs its own specification and approval regime, and a compliant product that is not approved is not acceptable. The relevant documents: TMR MRTS213 (UPS for Roadside Devices), Main Roads WA Specification 713, TfNSW ITS specifications including its standalone UPS specification for roadside devices, and DTP Victoria’s traffic signal controller specification. All sit on […]
Traffic signal controllers and intersection cabinets. Motorway and highway assets including ramp metering, lane control, traffic monitoring, CCTV, emergency phones and tolling support. Detection and monitoring including traffic counters, weigh-in-motion, vehicle detection and environmental monitoring. Variable message signs and driver information. Roadside communications and network cabinets. Temporary power for road projects, testing and incident response. […]
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