Grid-Tie System

Charged from the Grid to only provide power supply to essential equipment.

A Grid-Tied system in short is a solar system that’s connected to a Municipality/Eskom with no batteries.

A grid-tied system with no storage, with the aim to save power consumption during the day, is a viable option for South Africa. Unfortunately, if a Grid Export function is not permitted, the system will need to be significantly under-sized to minimise the excess energy generation as, typically, no surplus power can be exported.

If, however, the export or export with banking is permittable, excess energy can be exported to the grid with the option to generate credits to be used when required.

(Additional information is available on Eskom’s requirements and SSEG
application for a Grid-Tied or ESS installation/s).

The Grid-Tied system will generate electrical energy during the day when the irradiation can be utilised to convert sun energy to electrical energy. This process is only possible when the Inverter is connected to the grid and the power is energised.

Therefore, during black outs, grid failures and load shedding the grid-tied system will not produce any energy, since the Inverter requires to synchronise to a live grid.

This approval is an Eskom and Nersa requirement and only Inverters with the Eskom, Nersa and local Municipality approval can be used.

The proposed Grid-Tie System will generate power to the connected load for:

  • Self-consumption – when generated energy is consumed by the connected load and no energy is exported
  • Export energy – when the surplus energy generated, is exported to the connected grid
  • Non-Export – when the surplus energy can be generated, i.e., self-consumption is low, the inverter will be automatically controlled to reduce the output not to allow any energy to be exported to the connected grid
  • electrical installation.

If, however, the system is connected to the Eskom grid, additional selection/s is available:

  • Self-consumption – when generated energy is consumed by the connected load and no
    energy is exported
  • Export energy – when the surplus energy generated, is exported to the connected grid,
    but export can be selected between:
    • Export only
    • Export with Banking – when surplus energy is exported to the grid to be carried
      over to another month/s
  • Free Wheeling – when surplus energy is exported to the Eskom Grid to be used on another point of Consumption (See Eskom’s SSEG application and Information in this regard) The PV system will generate power during clear sunny days and during overcast days, the system
    will still produce, but at reduced levels.

Disadvantage of a Grid-Tied system:

  • Unfortunately, the system cannot generate energy without a grid connected.
Advantages

Advantages:

Grid-Tie Systems

9

Back-Up Power

Back-Up Power can be provided in case of Grid Failure

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System Lifetime of 25 Years

System design is for 25 years, inverters can be warranted for additional years at an additional cost and Lithium Batteries for 10 years.

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Save Money

Saving cost on power generated by the system, payback period is estimated at 3,5 years (at present increase and 8%/annum thereafter).

9

Tax Deductible

The system is tax-deductible and savings is directly related to the annual increase of Eskom – this year was 15% compare to the interest of savings account around 11% only.

Disadvantages

Disadvantage:

Grid-Tie Systems

9

Large Investment

The system requires large capital investments.

9

Grid Must Be Connected

Unfortunately, the system cannot generate energy without a grid connected.

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Address

1234 Divi St. #1000
San Francisco, CA 29362

Phone

(346) 234-5675

Email

info@divielectric.com