Solar On Grid Systems (Net metering)
Solar Hybrid System
- Providing Uninterruptable Power
- Buying a hybrid system from Going Solar will mean that when the grid fails, your system will keep going. Our hybrid systems are able to disconnect from the network in the event of a grid interruption (when a standard solar system would shut down). You will be able to continue to run certain appliances from your batteries (and solar during sunlight hours).
- Allowing you to outsmart the Utilities
- A hybrid system can ‘load shift’ as shown in the figure below. This means that the energy that you generate during the day is not wastefully fed back into the grid with minimal financial return to you. The energy is stored and can be used in the evening or whenever you like.
- Hybrid Systems are fully programmable
- An advantage of hybrid systems is that they are able to control and balance the available sources of energy:
- If the power generated by a solar array is insufficient to supply daytime loads as well as charge your batteries, the system can recharge your batteries from the grid when a lower off-peak electricity rate is available.
- When your electricity usage goes above a certain level, electricity companies may charge you at a higher rate for this increased level of demand. Hybrid systems can provide ‘peak lopping’ where some stored power can be drawn from the batteries to help balance the power usage.
- ‘Grid support’ can also be provided by your hybrid system if your grid connection does not have the capacity to supply a load. The hybrid system could supply the extra power. And this may allow you to avoid a costly mains upgrade to your property.
Solar Pumping Systems
Solar water pumping system is a stand-alone system operating on power generated by Solar Photovoltaic panels.
- Stock and domestic pumping
- and Bulk water pumping for irrigation.
Whether your pumping task is large or small, it is important that you approach solar from an informed position. Typically, diesel-powered pumps are used in areas where connecting to the electricity grid is difficult. Solar photovoltaic (PV) systems can be an attractive complementary energy source deployed alongside diesel pumps in areas with plenty of sunshine and where the cost to run power lines is high.
Photovoltaic systems have the benefit of being scalable, with capacity ranging from a few watts for applications such as automated farm gates or timers to hundreds of kilowatts for the homestead and farm sheds. Rather than having one large centralized system, a number of distributed PV systems can be deployed at pump sites.
Solar pumping systems are best suited for transfer operations (to pump water out of bore, for instance, or transfer it from dam to storage tank) in which pumps run continuously for most of the day.
Applications that require water to be pumped at night are not as well suited to solar-powered pumps, as storage solutions such as batteries and storage tanks can add significantly to the cost of the system. Although these energy storage solutions can be expensive, they allow for greater utilization of the PV system. Depending on the application, stocked water can be fed by gravity when there is insufficient sunlight to power the solar pumps, thus reducing diesel consumption further.
Due to the high capital costs that are still associated with solar systems, simple paybacks of seven to eight years are generally achievable only where pumping currently occurs for more than half the year. These costs are expected to reduce over the coming years as price reductions occur within the solar PV and commercial battery storage industries.
How does it work?
A typical solar-powered pumping system consists of solar panels connected to an electric motor that runs a bore or surface electric pump. A solar pumping solution available from your irrigation supplier will typically supply a DC (mains-powered) pump that is connected directly to the solar panel and does not require a DC/AC inverter. DC brushless motors also offer very high efficiency levels (over 90 percent). In cases where an AC (battery-powered) pump is already in place, an inverter is required between the PV panel and the motor to convert from the direct current generated by the solar panel to the alternate current required by the electric pump motor.
In the case of a solar-diesel hybrid system, a solar pumping system (PV panel plus pump) is installed to complement the existing diesel pump operation. The solar pump can either pump directly into the system to offset diesel pump operation during daytime, or pump water to a storage tank or reservoir (which is part of the solar pumping solution) so that water is also available on cloudy days and at night. This is illustrated in the figure below.
Key steps in sizing a solar pumping system
- Determine the total dynamic head (TDH) of the system using flow-rate requirements (L/min), pipe length and diameter, and height between suction and discharge points. TDH = static head + dynamic head (line friction).
- Determine the daily flow (m3/day) requirement and the expected number of weeks per year of pumping.
- Depending on the water source, choose a surface or submersible (bore) pump.
- Using manufacturer pump curves, select a pump of adequate size to meet head and flow requirements.
- Knowing the power requirement and running time for the selected pump, determine the electrical load profile of the pumping operation to then size the solar PV system.
- Refer to supplementary paper, solar photovoltaics.
- Ascertain the capacity of the storage dam or tank by determining the flow rate the process requires and the storage time, which equals the amount of time outside daylight hours for which the pump normally runs. Consider using battery storage or combinations.
Solar Street Light
- Due to off-grid nature of solar street lights, solar street lights incur minimal operational costs.
- Such lights are wireless in nature and are independent of the utility company. Compared to conventional street lights, solar street lights require almost zero maintenance. Due to the absence of external wires, these lights do not pose any threat of accidents like electrocution, strangulation and overheating. Infact, solar lights illuminate the streets throughout the night irrespective of power cuts and grid failures.
- Solar street lights are a delight for environmentalists around the world as it can provide significant lowering of carbon footprint of individuals, homes and businesses.
- In other words, solar-powered lights are a perfect green lighting solution.
Solar water heaters — also called solar domestic hot water systems — can be a cost-effective way to generate hot water for your home. Just like any other big purchases made for your home, its important when buying a solar geyser that you understand what you’re paying for, and how it will benefit you in the long run. They can be used in any climate, and the fuel they use — sunshine — is free. Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don’t.
- Direct circulation systems
Pumps circulate household water through the collectors and into the home. They work well in climates where it rarely freezes. The water moves through the solar collector and then directly into the geyser with the assistance of electrical pumps and controls. If not, it can be done via a natural thermosiphoning
- Indirect circulation systems
Solar Pump Inverters
The pumping inverter controls and regulates the operation of the system, transforms the direct current of solar cell array into alternating current to drive water pump. In addition, according to the change of sunlight intensity, regulate output frequency timely, to realize MPPT (Maximum Power Point Tracking). The water pump is driven by Single-phase AC motor. It pumps water from deep well, river, and lake, then inject water into water storage tank/pool, or directly connect with irrigation system or fountain system, etc. According to actual requirements of system and installation, different types of water pumps such as centrifugal pump, axial flow pump, mixed-flow pump, or deep-well pump can be used.
- Use independently-developed dynamic VI MPPT (Maximum Power Point Tracking) control method. The response speed is fast. Operation is stable and reliable.
- It solves the following problems: tracking effect is poor when sunlight intensity rapidly; operation is not stable; water hammer damage.
- All digital control. It has complete automatic operation, data storage, and complete protection functions.
- Solar Pumping Inverter is specially designed for solar water pump. The inner structure is more reasonable and professional.
- All key parts used in solar pumping inverter are made by international famous brands. The quality is reliable, service life is long, and quality assurance period is long.
- The shell of solar pumping inverter is thick. The design process is improved through abrasive tool test for many times. The appearance is elegant and exquisite, model is compact, and weight is proper.
- solar pumping inverter integrates combiner box. It includes DC switch, lightning arrester, fuse, and optional components. It greatly simplifies and facilitates equipment installation and maintenance, but also effectively protects the equipment.
Solar Hybrid Inverters
In the context of residential solar storage systems, a hybrid inverter (sometimes referred to as a multi-mode inverter) is an inverter which can simultaneously manage inputs from both solar panels and a battery bank, charging batteries with either solar panels or the electricity grid (depending on which is more economical or preferred). Their capabilities may go beyond this however – some devices also handle inputs from wind turbines, generators and other power sources.
Hybrid inverters can vary in size, performance and features. Most models usually operate bi-directionally, meaning they can convert DC power from modules to usable AC power and then convert stored AC from the batteries to power loads when needed. Hybrids can also remain grid-connected and use a mix of renewable and non-renewable energy to charge batteries and offset loads.
- All-in-one inverter solution for grid-connected solar-plus-storage systems
- Frequently intelligent and programmable for maximizing overall system efficiency and savings
- Can usually be installed without batteries for future expansion
- Long history of use in off-grid and stand-alone power systems
- Nominal cell voltage
- Nominal capacity
- Battery type
- Number of cells in the battery string