On-Grid PV Solar Power System and Off-Grid PV Solar Power System

Power systems are the systems that generate power. The power system covers all three areas from generation to distribution, and from distribution to transmission. There are many types of Power systems on which we are running, using different new emerging technology, which includes power generation by oil and coal mode, thermal source, hydel power, wind power, tidal energy, solar, or a hybrid of solar-wind or any other combination of energies like vibrating energy combine with solar and wind energy.

When building a power system there are other components involved that are combined to make fully functional and reliable electricity at the consumer load, rather than just solar arrays. There are the following solar-operated power systems for households and industries. 

  • Off-Grid power system
  • and On-Grid power system
  • And hybrid power system

In this article, we will consider our focus on the Off-Grid power system and On-Grid power system.

Off-Grid Power System

Without Grid Solar Power Systems are helpful in places where a utility power provider is not accessible or has yet to develop. An Off-Grid-connected solar power system (SPV) ideally suits this scenario, where there is no access to power (supply) or the small load, or in distant places because this system does not use any other internal or external source of power. The only source of energy or power comes from the sun during peak hours. Stand-Alone PV Systems (SPVS) are known as Off-Grid Power Systems for this reason.

Solar arrays can only convert the sun’s energy into direct current electricity, and they can only create energy (power) during peak hours. When there is no sun source at night time, there is a system or component required to store that energy for the non-shining hours. To tackle this need batteries of different types are designed. Batteries are an important component in non-connected grid PV systems as they will fulfill our need of getting a power source at non-peak hours and store the daytime power for after use. 

But if your load operated in daytime only like solar water pumping, then we can neglect the purpose of the battery from the Solar power system there.

Based on our load demand and control circuitry, we are configuring the Standalone PV System (SPVS) into four different classifications:

  • Standalone PV System (SPVS) having only DC load demand
  • Standalone PV System (SPVS) combining DC load and Control Circuitry
  • Standalone PV System (SPVS) with DC load and Control Circuitry with a combination of battery
  • Standalone PV System (SPVS) all together with DC/AC load and Control Circuitry with the combination of battery

The electronic control circuitry is added to the Standalone PV System (SPVS) due to two main reasons:

  • To improve the better functionality and operation of the load.
  • To improve the maximum and smooth utilization and performance of Solar PV Panel.

The only common, basic system that can function on any sort of residential load demand either AC or DC, is a Standalone Solar PV System. It is the best fit for the areas where there is no linked grid connectivity or grid connectivity is available for a very short time.

Stand-Alone PV Systems
Stand-Alone PV Systems

On-Grid Power System

The Grid-connected Power system in which power generates, transmits, and distributes to our residential units and industrial units(consumer units).

The electricity generated during the sun-shine hours by the large Solar Power System is fed into the existing electricity grid. The massive SPV system does not consume the generated energy and rather stores it for use during non-peak hours, so all the power generated by the large solar power system directly transmits to the existing grid station so there is no purpose for batteries in an on-Grid Power System.

With battery storage and without battery connected grid configuration into two main categories.

  • On-Grid Power System without battery
  • An On-Grid Power System with a battery
Grid-connected Power system
Grid-connected Power system

However, in many areas, the small Solar power system that can produce power up to five kW also has a grid-connectivity system. In residential SPV systems, few of them connect with the battery. The operation of this system is that whenever the SPV module generates electricity in non-sunshine hours and generates power that is more than the consumers need, it transfers to the connected grid, and this system uses a connected grid as the storage medium. However, if the consumer load needs more power, it takes energy from the connected grid. Moreover, cost-saving for the consumers.

UK Statistical Outlook as of 2020

In the UK, much of the solar power is part of the Renewable Obligations (RO) scheme. Non – accredited solar power capacity, on the other hand, predicts to have reached 1,036.9 MW of power in 2020.

Grid Power Outage Contrast – Outside Source to Access Electricity?

There is no grid power shutdown undergone in an off-grid-connected system as the system is not linked to a grid plant.

However, in contrast to a Grid-connectivity power system with or without a battery system, if there is an electrical breakdown that occurs during non-peak hours, you can get electricity from the utility units. But if damage (Islanding) occurs at an outside source that is the connected grid, then you have to wait until and unless the connected-grid returns to functionality.

Which is More Efficient: off-Grid or on-Grid Systems?

An off-grid system is best for locations where grid connectivity is not available. However, it has drawbacks, such as the requirement for a big capacity battery to store electricity during non-sunshine hours or taking into account the battery’s DoD (depth of discharge) for autonomy days.

Moreover, the grid-connected system is fit for household and industrial areas, if there are autonomy days or severe weather conditions for many days, you can rely on utility units. Therefore, both systems seem great according to consumer needs. Solar Panel Costing provides its UK best services in both On-grid and Off-grid installation systems.

However, both systems seem great according to consumer needs. Solar Panel Costing provides its UK best services in both On-grid and Off-grid installation systems.


Concluding the whole discussion on a note that whether you are using an Off-Grid Power System or On-Grid Power system or hybrid Power system, this type of system green power system helps us to reduce our Carbon Footprints and water footprints day by day. By adopting these green sources of energy you can contribute your part to reducing your Carbon Footprints and Water Footprints and saving the earth.

Kevin Martez

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