ESS (Energy Storage System)

The below videos has been created to simulated different scenarios of the Victron ESS system. This will give a brief example of how these systems use the leading software to manage your energy needs in the most cost effective and efficient way.

Overview

The Victron ESS system is the optimal design for hybrid systems working together with the grid to minimise the utility bill and at the same time reducing the dependence on the normal grid.

It has the ability to perform a grid tie function and also has a battery back-up for times when the national grid is not available.

Lowering you dependence on the grid and starting your future to a complete off-grid solution.

Power Failure

The video show an example of a system in a state where the national grid has failed. Only the essential or critical load will be stratified at this time. Systems in this state generally produce more than adequate power for essential load as the system design is to run non-essential loads that will not be present in time of load shedding of grid failure.

Night Time Usage

This shows how the batteries are being discharged to a set minimum percentage. Unless the grid fails where the batteries will discharge to the minimum safe operating voltage.

The Victron system also has an ability to schedule the discharge to happen only during certain time reducing the risk of batteries being discharged already when load shedding occurs.

Three Phase

A three-phase ESS system has at least one Multi installed on each phase.

Intelligent optimisation of the balance between the phases

ESS intelligently optimises the balance between the phases – as far as possible. While doing so, it will never charge on one phase whilst discharging on another.

The sun’s energy is fed to connected loads where the user wants a guaranteed supply, and the excess is used to charge the battery. Once the battery has been fully charged, the system starts behaving like a grid tied system, and any excess energy if fed to the energy intensive appliances as well, the air conditioners and pool pumps etc. This ensures that as much as possible of the available solar energy is used, and the user gets the full return on investment for the PV panels.

To further extend the use of solar energy when the sun does not shine, the battery drain can be programmed, for instance set at 50%. So, when the sun goes down, the battery energy is used to supply BOTH the critical loads, and the rest of the house. When the battery reaches 50% state of charge the loads will be fed from Eskom. In the event of a power failure, the batteries will be allowed to drain completely, supplying only the critical loads.

The beauty of these systems is that they can be installed at a much lower cost compared to a traditional “off-grid” system, and they are fully modular, so the user can keep adding panels and batteries over time to become fully independent of Eskom.

Three-phase ESS

A three-phase ESS system has at least one Multi installed on each phase.

Intelligent optimisation of the balance between the phases

ESS intelligently optimises the balance between the phases – as far as possible. While doing so, it will never charge on one phase whilst discharging on another. To better understand how it works, read these examples closely:

When the phases are in balance the situation is simple. Let’s say each phase is consuming 500 W, and only a small amount of PV power is available – 100 W on each phase. Each phase requires another 400 W …a total of 1200 W for all three phases. So 400 W will be drawn from the battery on each phase, and the draw from the grid will therefore be 0 W. Each separate phase will also be at 0 W.