Inverters : Which one is the best for you – Bi-Directional Systems

Solar systems seems complex with all the choices you must make to get to the right system for you. A solar system is defined by the type of inverter it use to produce electricity. There are a number of types, brands and philosophies available in the market. Which one is the best for your requirements?

We will try to simplify the system design by discussing the different inverters available to you.

Bi-Directional Systems

Bi-Directional Systems combines the best of two systems: Hybrid and Grid Tied.

Bi-Directional systems consists of the following components:

  1. Solar modules that collect sunlight and convert it into DC power
  2. Batteries
  3. Charge controller that charge the batteries
  4. Inverter that converts the battery DC power into AC power

(The charge controller and inverter may be combines in one unit)

This is how it works:

The charge controller charges the batteries from the solar modules

The inverter convert the battery power to AC power for the backup circuits on demand

The inverter generate Electricity from the extra power from the sun

If the batteries charge is low, it will switch over to Eskom power
If the batteries charge is low, it might use Eskom power to charge the batteries

This is a dual Solar system where one channel uses Solar power to charge batteries and supply power to the building. A second channel supplies Solar power directly to all other circuits in the building when the sun shines

This solution is ideal for the following scenarios:

  • Ensure a steady power supply to dedicated circuits, even during power outage
  • Solar power keeps the batteries fully loaded for backup at night
  • Extra solar power reduce the electricity usage of the whole building

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