Grid-Tied Solar

A grid-tied solar system consists of solar panels and a grid-tied solar inverter. This is the most common form of solar installed throughout the world. The solar system generates electricity, this electricity is used in the home and the excess is sent back out to the grid. If the solar generation is not enough to cover demand power will be used from the grid.

Most grid-tied systems will disconnect during a power outage. There are two reasons for this:

1. If the lines are down, it would be dangerous to send electricity back to the grid. There is a chance a line worker could get electrocuted.

2. The grid is used as a buffer for the ever-changing loads in your household. Without a grid connection, the solar inverter wouldn’t be able to manage the varying demand. For example, you are boiling the kettle using all the solar power you are generating, the kettle flicks off, now where does the solar power go if there is no grid? Inverters cannot react that fast.

Hybrid Solar

This system is a mix between a grid-tied solar system and an off-grid system. It consists of, Solar panels, Solar inverter and a battery bank.

A grid-tied send excess solar energy back to the grid. A hybrid system is designed to capture this excess energy and store it in the batteries. This energy can then be used at night or to meet peak demands, reducing or eliminating energy used from the grid.

A major difference between a hybrid system and off-grid system is the battery bank size. An off-grid system will generally have the battery sized to get through a few days of inclement weather, whereas a hybrid system will usually be sized to store enough energy to get through the night until the sun comes out the next day.

As hybrid systems have a battery you would expect to have backup power in the case of an outage. It pays to be careful with components you choose here as some systems will not have the backup function, they are purely to save excess solar power to be used at night. so in a power cut, you will find yourself without power.

If you are unsure about installing a battery or not at first, then that’s no problem at all. Just install a grid-tied system, ensure you have consumption monitoring. Then down the track when you have monitored your system, you will know which battery will be right for your system.

Off-Grid Solar

In some areas, there is no grid to connect to. To supply power in areas without a grid, you need a separate system.

Examples of stand-alone systems are:

Homes that are too far from power lines to connect. Generally, if the house is more than 300m from a power line, it may be worth considering going off the grid.

Cottages in remote areas. They are far from the grid and their only option is to install their own independent power system.

weather station. Often in remote areas, weather stations require their own independent systems.

Radio or telephone antenna. Most of the equipment is located on the top of the mountain to reach the maximum number of people. Connecting power cables to these tops can be expensive, and most of the time it makes more sense to have your own off-grid system.

Off-grid systems include:

• Solar Panels - Power Generation

• Battery Storage - Stores energy for night or off-day use

• Inverter - converts direct current to alternating current for use with common appliances

• Monitoring - Monitor battery charge status and solar input

   

The components we use in off-grid are changing in recent years, mainly in terms of battery types. Lead acid battery packs are traditionally used. In recent years, it has often been beneficial to use lithium batteries such as Tesla, BYD or Pylontech.

In order to avoid damage to the lead-acid battery, it can only discharge about 20-30%. That means a very large battery pack is needed to store energy for several days. With lithium, they can be fully discharged without damaging the battery. This means smaller battery packs and a lower risk of system damage.

Lithium-ion batteries charge much faster than lead-acid batteries, which means that if the sun is out for a short period of time, the lithium-ion battery can make the most of this energy. Lead-acid batteries typically take 7-8 hours to complete a charge cycle, so are often not able to fully utilize the available energy.

Off-grid systems usually also have a generator input. This is a backup in the event of prolonged severe weather. Another advantage of lithium batteries is that in the event that a generator needs to be used, the time the generator will run will be significantly reduced to charge the battery.

Modern off-grid systems are capable of online monitoring. This allows monitoring of the system through a cloud platform, so you can keep an eye on your system from anywhere in the world. At Wanaka Solar, we love this feature because it allows us to keep an eye on your system as well and help you with any queries or system maintenance.

Photovoltaic (PV) module manufacturers are constantly working to find new, more advanced alternatives to improve the efficiency of solar panels. Efficiency can be improved through innovative cell manufacturing techniques, and now there are a few contenders in the solar photovoltaic market.

The latest module trends expect market growth to focus on HJT and TOPCon solar cells.

The 2022 report from the International Technology Roadmap for Photovoltaics (ITRPV) shows some of the expected trends over the next 10 years:

❖ PERC (passivated emitter rear contact) solar cell technology currently leads the market with a market share of approximately 75%. However, it is expected that the share of p-type monocrystalline PERC cells will drop to about 10% in the next 10 years.

❖ The market share of N-type TOPCon (tunnel oxide passivated contact) technology will increase from about 10% in 2022 to 60% in 2033, becoming the mainstream silicon wafer type. The largest increase is expected to begin in 2024.

❖ N-type HJT (heterojunction solar cells) is expected to increase from approximately 9% (2023) to over 25% in the next decade. The implementation of heterojunction cell technology still faces difficulties due to the high production costs of solar cells and the incompatibility of production lines with existing technologies.

P-type PERC and N-type TopCon

PERC technology is a cost-effective compromise between efficiency and large-scale production. But improving solar panel efficiency using this approach has been slow. The current efficiency of mainstream P-type modules is about 21.4%, and will increase to 22.75% in the next 10 years.

N-type TOPCon solar cells installed in photovoltaic modules look identical to PERC cells. Both P-type and N-type solar cells are made from silicon wafers. The difference between them is the way the wafers are doped with chemicals to increase the amount of electricity generated.

Simply put, P-type cells are doped with boron, while N-type cells are doped with phosphorus. In contrast, phosphorus degrades less than boron when exposed to oxygen. In addition, phosphorus doping can add free electrons to the wafer, thereby increasing efficiency.

Therefore, N-type based modules can achieve higher efficiency. It is estimated that efficiency, currently close to 22.5%, will increase to around 24% over the next 10 years.

The problem with the N-type manufacturing process is that it is still relatively expensive.

What are the advantages of TOPCon technology?

1. Manufacturing process

TOPCon modules can be manufactured using almost the same machines as P-type modules, which means that the use of TOPCon cells does not require a large investment by manufacturers.

2. Higher efficiency

According to the Fraunhofer ISE institute, efficiency can exceed 25%. The maximum theoretical efficiency of PERC cells is approximately 24%.

3. Reduce degradation rate

Compared to PERC panels, TOPCon modules have lower power decay during the first year and 30 years of PV panel life.

4. Lower temperature coefficient

TOPCon batteries have better resistance to extreme weather scenarios.

5. Double-sided rate

The bifacial coefficient of PERC PV modules averages about 70%, while the bifacial coefficient of TOPCon panels is as high as 85%. They capture more energy from the back than PERC bifacial modules, which is beneficial for ground-mounted utility projects. They are also more attractive from an aesthetic perspective than PERC solar panels.

6. Low light performance

TOPcon modules are more efficient in low-light conditions, extending power generation during the day and improving the performance of the installation over time.

Gel battery is a valve-regulated maintenance-free lead-acid battery. Gel batteries are very strong and versatile. This type of battery produces very little fumes and can be used in places without much ventilation.

How do gel batteries work?

A gel battery is a valve-regulated lead-acid battery in which a predetermined amount of electrolyte is mixed with silica fume along with sulfuric acid. This chemical reaction produces a fixed, gel-like substance that gives these batteries their name. Gel batteries are virtually maintenance-free because they use a valve that opens in one direction, allowing the gas inside to recombine into the water, so there's no need to check top up with distilled water or monitor the water level. Gel batteries are very strong and versatile. They can be safely installed in places with restricted ventilation as their gas/smoke production is very low (nearly zero) meaning you can even install batteries in your home.

Special consideration should be given when choosing a charger for gel batteries, as they charge at lower voltages. Overvoltage can cause malfunctions and performance degradation. The term GEL battery is sometimes used to refer to a sealed, maintenance-free battery marked as a setting on the charge controller. This can be confusing and can lead to the wrong charger selection or wrong settings while charging. If other charging methods such as alternators are used, an appropriate voltage regulator must be installed to control the charging voltage. Typical charging voltages for batteries range from 14.0 volts to 14.2 volts, and float voltages range from 13.1 volts to 13.3 volts.

Advantages of Gel Batteries

Gel batteries are gaining popularity in solar systems for the following reasons:

1.Best for deep cycle applications, typically in the range of 500 to 5000 cycles

2.Maintenance free

3.Spill proof

4.Minimal corrosion and therefore compatible with sensitive electronics

5.Rugged and Vibration Resistant

6.Very safe as there is less risk of sulfuric acid burns

7.Minimum cost per month (cost/months of life)

8.Lowest cost per cycle (cost/life cycle)

Disadvantages of Gel Batteries

1.Can't refill in case of overcharging

2.Requires special charger and voltage regulator

Do not confuse AGM batteries with GEL batteries

Today, AGM batteries are often mistaken for gel batteries because of their many similarities.

1.Both are reconstituted - meaning that the oxygen produced on the positive plate is absorbed by the negative plate. Instead of producing hydrogen, the negative plates now produce water, thus maintaining the water content in the battery. That's why AGM and Gel batteries are valve regulated, sealed, spill proof, maintenance free, vibration resistant and can be installed in any location.

2.The notable difference between the two is the difference in electrolytes. The electrolyte used in gel batteries looks like jelly, while the electrolyte in AGM batteries is absorbed in a glass mat that acts like a separator. Due to the properties of the electrolytes used in gel batteries, the batteries lose power quickly at temperatures below 32 degrees Fahrenheit, whereas AGM batteries work efficiently at low temperatures.

3.Gel batteries are best for deep discharge because they are less acid and protect the plates better than AGM batteries. AGM is more compatible where high current is required

Building-integrated photovoltaics (BIPV) are solar power generating products or systems that are seamlessly integrated into the building envelope and part of building components such as facades, roofs or windows. Serving a dual purpose, a BIPV system is an integral component of the building skin that simultaneously converts solar energy into electricity and provides building envelope functions such as:​

• weather protection
• thermal insulation
• noise protection
• daylight illumination
• safety

 

Applications​   1. Facade – PV can be integrated into the sides of buildings, replacing traditional glass windows with semi-transparent thin-film or crystalline solar panels. These surfaces have less access to direct sunlight than rooftop systems, but typically offer a larger available area. In retrofit applications, PV panels can also be used to camouflage unattractive or degraded building exteriors.
		2. Rooftops – In these applications, PV material replaces roofing material or, in some cases, the roof itself. Some companies offer an integrated, single-piece solar rooftop made with laminated glass; others offer solar “shingles” which can be mounted in place of regular roof shingles.
3. Glazing – Ultra-thin solar cells may be used to create semi-transparent surfaces, which allow daylight to penetrate while simultaneously generating electricity. These are often used to create PV skylights or greenhouses.

 

Benefits of BIPV​

 

The benefits of BIPV are manifold: BIPV not only produces on-site clean electricity without requiring additional land area, but can also impact the energy consumption of a building through daylight utilization and reduction of cooling loads. BIPV can therefore contribute to developing net-zero energy buildings. Turning roofs and façades into energy generating assets, BIPV is the only building material that has a return on investment (ROI). Furthermore, the diverse use of BIPV systems opens many opportunities for architects and building designers to enhance the visual appearance of buildings. Finally, yet importantly, building owners benefit from reduced electricity bills and the positive image of being recognized as "green" and "innovative".

 

In the face of climate change, the world is evolving rapidly, and it comes an urgent need of sustainable energy solutions. One of the innovative solutions to this global problem is Building Integrated Photovoltaics (BIPV). These solar panels not only serve the dual purpose of providing power and generating electricity for house, but also shaping the future urban infrastructure. Let's rearch deeper for why BIPV is not only a viable option for modern construction, but the preferred choice.

Benefits of BIPV Panels

Building-integrated solar panels offer house owners and businesses a unique solution. They are not just additions to the existing structure; they are embedded within the structure itself. Because they act as both a building envelope and an energy generator, no need for a separate solar installation, providing functionality and aesthetics.

Space Efficiency

Building-integrated solar offers unique advantages in urban environments where space is at a premium. By integrating solar panels directly into building facades or roofs, no additional land or space is required to accommodate large solar farms. This efficient use of space is especially beneficial in densely populated areas. By choosing vertical or rooftop solar installations in urban environments, we can leave more land undisturbed. This approach protects natural habitats and supports biodiversity, unlike large ground based solar farms that sometimes damage local eco systems.

Resource Efficiency and Environmental Impact

Integrating solar panels into buildings reduces the need for additional materials and space. This means fewer resources are used and less waste is produced. By reducing the amount of raw materials required for construction and installation, we minimize our environmental footprint and pressure on natural resources. Additionally, because solar energy is green and renewable, it significantly reduces buildings' carbon footprint.

Design Flexibility

A building's aesthetics are an integral part of its appeal, value, and ability to blend in or stand out in its environment. Building-integrated solar panels continue to develop not only as functional components, but also as design elements that can enhance the attractiveness of buildings.

Thanks to advances in technology and manufacturing techniques, building-integrated photovoltaic systems can be integrated into a variety of building styles, from traditional to contemporary. This ensures that the integration of solar panels does not compromise the building's original design vision, but rather complements or even enhances it.

With modern technologies, roof-integrated systems can be customized to match a variety of architectural styles. Whether you want to integrate with existing roof tiles or achieve a seamless look, you have the flexibility to accommodate any design preference.

BIPV offers a range of design options. This includes different colors, textures and opacity. Some BIPV solutions even mimic materials like slate or terracotta, allowing architects and house owners to maintain a specific aesthetic while still reaping the benefit of solar energy.

While rooftops are a common site for building PV integration, the technology's adaptability means it can also be used on facades, awnings, or even as part of a building's shading system. This broadens design possibilities and enables architects to think creatively about how and where to incorporate solar power into their designs.

Photovoltaic Building Integrated Applications

1. Awnings and canopies. Outdoor structures such as awnings. Awnings are ideal for building-integrated photovoltaics, capturing sunlight while providing shade.

2. Facades. BIPV facades convert building appearance into energy, blending aesthetics with functionality. Large glass curtain wall can be equipped with translucent integrated solar panels that filter sunlight while generating energy.

3. Balcony and terrace. Integrating building-integrated photovoltaics into a balcony or terrace.

4. Roof installation. Rooftop installations are the most common application of building-integrated photovoltaics, blending seamlessly with the contours of the building. Here, the roof not only acts as a barrier against the elements, but also acts as a solar generator.

Solar bollard lights bring a fresh perspective to landscape design, combining eco-friendly technology with modern elegance. These solar powered outdoor lights are perfect for creating illuminated pathways, cozy garden corners, or vibrant public spaces, all without the hassle of wiring. Their sleek, minimalist appearance effortlessly blends into various outdoor themes, offering a seamless mix of functionality and style.

When thoughtfully positioned, solar bollard lights enhance both safety and ambiance. Whether guiding guests along a winding walkway or spotlighting a flower bed, these solar LED lamps provide a gentle, inviting glow. Adjustable brightness settings allow for a range of effects, from subtle accents for intimate spaces to bright, clear lighting for busy areas like parking lots or patios.

What sets solar bollard lights apart is their commitment to sustainability. By harnessing the power of the sun, they reduce electricity usage and contribute to greener living. Modern designs come equipped with efficient solar panels and long-lasting batteries, ensuring they perform well even on cloudy days. For eco-conscious homeowners and businesses, these lights are a win-win solution.

Maintenance is another area where solar bollard lights shine. Installation is simple, as there’s no need for digging trenches or dealing with complex wiring. Designed with durability in mind, many options are crafted from weather-resistant materials like aluminum or stainless steel. For those seeking an easy-to-manage, stylish lighting option, solar bollard lights are a smart addition to any landscape design.

SLD, Solar Lights Do, is a company that specializes in manufacturing and selling high-quality SLD solar lights. We offer a wide range of efficient and durable solar lighting solutions designed for outdoor use. If you're interested, please visit us at www.solarlightsdo.com. 

Last year in OSAKA PV EXPO, we received numerous inquiries about our carport solutions. Among them, one design has stood out as the crowd favorite - the One-Legged Solar Carport.

True to its name, this carport is supported by a single leg, unlike conventional four-legged or W/N-shaped structures. Crafted from high-quality steel, it boasts exceptional strength and durability, putting all concerns to rest.

But what sets this design apart? Let's explore its remarkable benefits:

1. The sleek and elegant design ensures a visually appealing addition to any environment.

2. With its space-saving footprint, it maximizes the number of vehicles that can be accommodated, increasing usage efficiency.

3. With its simple structure, setting up this carport is a breeze, enabling you to enjoy its benefits with minimal hassle.

4. The versatile design allows for vehicle entry and exit from various directions, providing utmost convenience.

With the rise of electric vehicles, we understand the growing importance of convenient car charging. Imagine having an all-in-one solution that not only safeguards your vehicle but also harnesses the power of the sun for efficient charging, wouldn't that be incredible?

Whether you own an industrial parking lot or have a parking space at your home or office, we invite you to explore the possibilities of installing our state-of-the-art Solar Carport. Don't miss this opportunity!

Feel free to reach out to us for more information or to discuss your unique needs. We look forward to serving you with the finest solar carport solutions available.