Systems: stand-alone power, off-grid and deployable

Frequently, yes, and the crossover point is closer than most asset planners assume. Rural network extension and replacement in Australia is commonly costed in the range of tens of thousands to hundreds of thousands of dollars per kilometre depending on terrain, access, vegetation and line construction standard. A SAPS is a fixed cost per site. Where a single customer sits at the end of several kilometres of line, the SAPS is usually the cheaper option on capital cost alone, before any operating saving.

The operating case is often larger than the capital case, and it is the part that gets under-counted:

• Vegetation management on the removed line, in perpetuity
• Inspection and maintenance of poles, conductor and pole-top assets
• Fault response to a line that is long, remote and slow to patrol
• Bushfire and storm exposure, both the risk cost and the mitigation cost
• Reliability penalties, every hour of outage on that feeder is counted

Standalone power systems are reducing outage hours by around 90% on remote properties. Pilot programs have cut outage durations from 1,000 hours over five years on individual sites down to 72 hours. Long-term network scenarios contemplate deployments of thousands of units, removing tens of thousands of poles and tens of thousands of kilometres of conductor.

Multiple DNSPs are targeting 400+ SAPS installations across their networks by 2029. The economics are straightforward: a SAPS costs less than extending, maintaining and operating remote lines indefinitely.

The number that decides it on any given feeder is line length per customer. If you can send us that, plus the customer’s load profile, we can size the system.

ModX2 Q5.3 and hub C2. [days of autonomy off grid] AS/NZS 4509.2 guidance: 2 days with automatic generator control, 2–3 days manual, 4–5 days with no generation backup. The governing input is the maximum contiguous low-solar run at your site in the worst month, at end-of-life battery capacity.

Not necessarily. If the generator is running weekly in a normal year, the solar and storage are undersized.

The energy the system consumes to run itself before any reaches your load. On a small remote load it can be a large fraction of daily generation, and it is rarely quoted. Ask for total daily parasitic consumption in kWh, and whether quoted usable storage is before or after it.

ModX for off-grid solar powering monitoring and small loads, with ModX2 the fixed-frame certified platform for remote critical infrastructure. Vantara for permanent large-scale stand-alone supply, and Vantara Rapid for standardised multi-site rollouts. V-Trail where the requirement moves or is measured in weeks. Valen also supplies Vora grid resilience batteries and VoraPlus community batteries for network-scale applications.

A stand-alone power system, or SAPS, generates and stores electricity at the point of use instead of taking supply from the distribution network. In Australian utility practice it typically combines solar generation, lithium battery storage, an inverter that produces standard 230/240 V AC, an energy management system, and often a small backup generator, all installed at the site it serves, with no connection to a distribution feeder.

SAPS are used in two distinct ways in Australia, and it is worth being clear which one you mean. Distributor-led SAPS replace an existing network connection: a DNSP identifies a long, low-customer-density feeder, often a single property at the end of several kilometres of line, and substitutes a SAPS for the poles and wire. Site SAPS power infrastructure that never had a grid connection at all: remote telecommunications, water pumping, mine infrastructure, monitoring stations, rail trackside assets.

The engineering is similar. The commercial case, the regulatory treatment and the reliability standard applied are quite different. Vantara is built for both, but the sizing conversation starts differently depending on which you are doing.

Technically they overlap; commercially they are different products for different buyers. “Off-grid solar” generally describes a system serving a premises that chose not to connect. “SAPS” is the utility and infrastructure term, and it carries expectations that off-grid solar usually does not: a defined reliability standard, redundancy, remote monitoring, SCADA integration, and in the distributor-led case a regulatory framework governing the customer’s rights. Same physics, different specification.