• SMA solar inverters (PV)
  • Victron charger/ inverters
  • Solar pump drives
  • Solar panels (Solar world / Solaire direct)
  • Victron Charge controllers
  • Batteries (Hoppecke and Solartron)



Consist of a Grid tie (P.V.) Inverter Connected directly to the household AC circuit. DC power produced by the PV system is inverted by a grid tie inverter into an AC supply that can be consumed directly by the household loads. The system does not contain a backup system and when the AC grid fails the inverter will stop to operate due to safety reasons to protect the electrical network.


  • Self consumption of PV power.
  • Lower cost.
  • Highest efficiency.
  • Ease of installation.
  • Low maintenance.


  • No backup.
  • Grid off, PV off.


Consist of a PV system with Solar Panels with Bi- directional backup inverter/charger and a backup battery bank. This system provides a backup from the battery bank when the grid fails. It uses the Solar power or the grid to charge the batteries. When there is excess solar power it will be used on the load and excess energy will be sent back into the grid if selected to do so.


  • Backup facility due to batteries and inverter/charger.
  • Essential circuits remain operational.
  • System in supplementary mode in grid connected scenario.


  • Non essential circuits disconnected when grid fails.
  • Increased Cost due to battery component.
  • Battery replacement timeframe of 4-15 years depending on how the battery system was designed and/or configured.

Off grid: 

Is the most advanced system to completely go off the AC grid. Batteries store energy which is produced by the sun. This setup consists of Solar panels and an MPPT charge controller which charges and maintains the batteries, exclusively from solar power. A DC to AC inverter is then used to generate power for the AC load. An additional option is to install a remote generator to start and charge the batteries in a low sun condition to keep the batteries within optimal working condition.


  • Independence of municipal grid.
  • Immune to utility tariff increases.
  • Backup facility due to batteries and inverter/charger.
  • Essential and non essential circuits remain operational.


  • Much higher cost since batteries have to cater for full load. (No grid assistance).
  • Battery replacement timeframe of 4-15 years depending on how the battery system was designed/configured.

System type based on grid reliability.

Grid reliability
Recommended Solution
(50-99%) 50% No Grid
Supplementary Hybrid Offgrid
Or Or
Supplementary with Backup Generator Supplementary with Backup Generator