Grid Connect installations are ideal for home and business owners looking to offset their energy consumption with solar PV energy. Referred to as grid-tied PV systems, savings are generated by consuming the generated energy directly and exporting any excess to the grid. These are by far the most popular PV systems as they are simplistic in design, very safe to use and generate substantial savings from the day they are commissioned. The STC/LGC rebates in place for these systems could provide up to 40% year on year ROI. Volta offers quality grid connect solutions in both the residential and commercial sectors.

Residential Solar

Our Residential PV system design process utilises industry leading software that takes into account geographic location/weather, consumption, time-of-use and load flexibility to determine the optimal system design.

Residential PV system sizes range from around 6.6kWp* to 39kWp. Grid approvals need to be obtained from the local Distribution Network Service Provider. Allowable AC inverter capacity per phase is normally 10kW of inverter output export limited to 5kW.

  • Single phase homes can have a maximum of 10kW** AC inverter capacity with 13kWp of PV panels (5kW export limit)
  • Three phase homes can have a maximum of 30kW AC inverter capacity with 39kWp of PV panels (15kW or more export export limit)
  • 6.6kW PV systems produce a daily average of around 30kWh of power and caters for the needs of most small to medium households
  • Sizing the PV capacity to exceed the inverter output capacity by roughly 30%, ensures longer max inverter output during peak solar hours

The table outlines various system sizes and expected savings based on projected average annual production. The assumptions are based on 60% self consumption and 40% export with a 85% overall system efficiency (accounting for dirt and downtime). Once you have installed your solar system, the goal is to try and self-consume as much produced energy as possible while exporting less to ensure maximum savings.

* kWp = Kilowatt Peak relating to total PV
**kW = Max inverter output or consumption rating
***kWh = Battery storage capacity

Below the typical system specifications (single or 3-phase).

Major Components:
5kW AC Inverter (output capacity)
20 x 330W Mono PV Panels

Extras to consider:
Meter-board compliance (might need upgrading to connect to the grid)
Consumption meter (to monitor system self-consumption)
Water Heater Timers (manage water heater time of use)

Expected quarterly savings: $400 to $600 per quarter

Typical price range for a decent quality system: $5,599 to $8,599+

Commercial Solar

As per residential, our Commercial PV system design process utilises industry leading software that takes into account geographic location/weather, consumption, time-of-use and demand to determine the optimal system design – we can also asses the interval consumption data for the last year to achieve even more accurate outcomes. Commercial PV systems are unique and offer returns of between 20% to 38% annual return on investment, over a 25 yea life cycle.

System sizes may range from around 10.5kWp* to 99.9kWp size range to qualify for the upfront STC rebate. System sizes over the 99.9kW threshold on a single NMI qualify for LGC rebates increasing the upfront system cost, but provide guaranteed returns in the long run. Overall, most businesses save as they repay their initial investment leases over 3 to 5 years with a guaranteed income of up to 25 years. The grid approval process is much more complex with varied export limitations and needs to be managed by qualified engineers.

  • System sizes up to 39kWp are not subject to engineering costs and provide great return on investment figures
  • All systems over 39kWp require engineering, grid protection and advanced system design expertise
  • Optimal results are achieved with 99.9kWp system size for medium to large industry as the upfront rebate reduces cost of ownership
  • LGC systems (over 99.9kWp) are still profitable and might pose a longer payback curve, but offers higher long term returns

The table to the right outlines various system sizes and expected returns based on expected annual production. The savings figures are based on 60% self consumption and 40% export with a 85% overall system efficiency over the period of a year.

* kWp = Kilowatt Peak relating to total PV
**kW = Max inverter output or consumption rating
***kWh = Battery storage capacity

Below the typical system specifications (3-phase).

Major Components:
30kW AC Inverter (output capacity)
120 x 330W Mono PV Panels
Consumption Meter

Extras to consider:
Meter-board compliance (might need upgrading to connect to the grid)
Water Heater Timers (manage water heater time of use)

Expected quarterly savings: $2,400 – $3,000

Typical price for a decent quality system: $29,995+

Stand-Alone systems, otherwise referred to as off-grid installations, can be considerably more complex than Grid Connect systems. Reliable Stand-Alone systems are dependent on equipment quality and attention to detail in terms of system design and installation. We advise that these systems are designed at least 20% over required output and storage capacity, as consumption is likely to increase over time and to account for long term degradation. Volta also offers modular solutions which can be upgraded in either output and storage capacity as required. We cater for any size system, from tiny homes to off grid businesses or farming and mining operations.

The most common applications for Stand-Alone systems are:

  • Mobile and marine (vehicles and boats)
  • Remote worksites
  • Tiny homes, caravans and motor homes
  • Single/Three phase residential homes
  • Business properties and small holdings
  • Farming or off grid manufacturing operations

There is a whole array of Stand-Alone battery inverters that can convert 12, 24 or 48V DC power to usable AC current. The inverters can output anywhere between 500 to 135 000kVa+. The table outlines popular system sizes and expected output. It is also vital to incorporate an alternative power source such as a diesel generator in the system design to guarantee uninterrupted power.

* kWp = Kilowatt Peak relating to total PV
**kW = Max inverter output or consumption rating
***kWh = Battery storage capacity

Below the typical system specifications (3-phase).

Major Components:
30kW AC Inverter (output capacity)
120 x 330W Mono PV Panels
Consumption Meter

Extras to consider:
Meter-board compliance (might need upgrading to connect to the grid)
Water Heater Timers (manage water heater time of use)

Expected quarterly savings: $2,400 – $3,000

Typical price for a decent quality system: $29,995+