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Wholesaler & Retailer for Renewable Energy in Thailand and Asia

Why Solaris Green Energy

Why Choose Solaris Green Energy?

  • Knowledge of Solar Energy in Thailand
  • Experience in Renewable Energy
  • Access and knowledge of latest products
  • Ability to project costs and benefits
  • Experienced Installation Experts

Renewable energy in Thailand

Thailand has committed to increasing its use of renewable energy.

Business that use Green technology have a business advantage over their competitors.

Advantages include being less reliant on the grid, cost savings, Business Image and Many more.

Steca Solarix PLI 5000 - 48


Axitec Solar Batteries



SMA Introduces First Freestanding Inverter for Commercial PV Systems






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Grid-Tied, Off-Grid and Hybrid Solar Systems        
What are the benefits of grid-connected solar panels vs. living off the grid? Deciding whether or not to grid-tie your solar panels is usually pretty straightforward – the clear-cut benefits of being grid-tied appeals to the majority of homeowners. There are, however, some people that choose to live off the grid.
What would be the best in your situation? Let`s look closer at the benefits and downsides of grid-tied, off-grid and hybrid solar systems.
Grid-Tied Solar Systems
Grid-tied, on-grid, utility-interactive, grid intertie and grid backfeeding are all terms used to describe the same concept – a solar system that is connected to the utility power grid.

Advantages of Grid-Tied Systems
1. Save more money with net metering
A grid-connection will allow you to save more money with solar panels through better efficiency rates, net metering, plus lower equipment and installation costs:
Batteries, and other stand-alone equipment, are required for a fully functional off-grid solar system and add to costs as well as maintenance. Grid-tied solar systems are therefore generally cheaper and simpler to install.
Your solar panels will often generate more electricity than what you are capable of consuming. With net metering, homeowners can put this excess electricity onto the utility grid instead of storing it themselves with batteries.
Net metering (or feed-in tariff schemes in some countries) play an important role in how solar power is incentivized. Without it, residential solar systems would be much less feasible from a financial point of view.
Many utility companies are committed to buying electricity from homeowners at the same rate as they sell it themselves.

2. The utility grid is a virtual battery

Electricity has to be spent in real time. However, it can be temporarily stored as other forms of energy (e.g. chemical energy in batteries). Energy storage typically comes with significant losses.
The electric power grid is in many ways also a battery, without the need for maintenance or replacements, and with much better efficiency rates. In other words, more electricity (and more money) goes to waste with conventional battery systems.
According to EIA data[1], national, annual electricity transmission and distribution losses average about 7% of the electricity that is transmitted in the United States. Lead-acid batteries, which are commonly used with solar panels, are only 80-90% efficient at storing energy, and their performance degrades with time.
Additional perks of being grid-tied include access to backup power from the utility grid (in case your solar system stop generating electricity for one reason or another). At the same time you help to mitigate the utility company`s peak load. As a result, the efficiency of our electrical system as a whole goes up.
Equipment for Grid-Tied Solar Systems
There are a few key differences between the equipment needed for grid-tied, off-grid and hybrid solar systems. Standard grid-tied solar systems rely on the following components:
Grid-Tie Inverter (GTI) or Micro-Inverters
Power Meter
Grid-Tie Inverter (GTI)
What is the job of a solar inverter? They regulate the voltage and current received from your solar panels. Direct current (DC) from your solar panels is converted into alternating current (AC), which is the type of current that is utilized by the majority of electrical appliances.
In addition to this, grid-tie inverters, also known as grid-interactive or synchronous inverters, synchronize the phase and frequency of the current to fit the utility grid (nominally 60Hz). The output voltage is also adjusted slightly higher than the grid voltage in order for excess electricity to flow outwards to the grid.
Micro-inverters go on the back of each solar panel, as opposed to one central inverter that typically takes on the entire solar array.
There has recently been a lot of debate on whether micro-inverters are better than central (string) inverters.
Micro-inverters are certainly more expensive, but in many cases yield higher efficiency rates. Homeowners who are suspect to shading issues should definitely look into if micro-inverters are better in their situation.


Power Meter
Most homeowners will need to replace their current power meter with one that is compatible with net metering. This device, often called a net meter or a two-way meter, is capable of measuring power going in both directions, from the grid to your house and vice versa.
You should consult with your local utility company and see what net metering options you have. In some places, the utility company issues a power meter for free and pay full price for the electricity you generate; however, this is not always the case.
Off-Grid Solar Systems
An off-grid solar system (off-the-grid, standalone) is the obvious alternative to one that is grid-tied. For homeowners that have access to the grid, off-grid solar systems are usually out of question. Here`s why:
To ensure access to electricity at all times, off-grid solar systems require battery storage and a backup generator (if you live off-the-grid). On top of this, a battery bank typically needs to be replaced after 10 years. Batteries are complicated, expensive and decrease overall system efficiency.

Advantages of Off-Grid Solar Systems
1. No access to the utility grid
Off-grid solar systems can be cheaper than extending power lines in certain remote areas.
Consider off-gird if you’re more than 100 yards from the grid. The costs of overhead transmission lines range from $174,000 per mile (for rural construction) to $11,000,000 per mile (for urban construction).[2]
2. Become energy self-sufficient
Living off the grid and being self-sufficient feels good. For some people, this feeling feeling is worth more than saving money. Energy self-sufficiency is also a form of security. Power failures on the utility grid do not affect off-grid solar systems.
On the flip side, batteries can only store a certain amount of energy, and during cloudy times, being connected to the grid is actually where the security is. You should install a backup generator to be prepared for these kinds of situations.
Equipment for Off-Grid Solar Systems
Typical off-grid solar systems require the following extra components:
Solar Charge Controller
Battery Bank
DC Disconnect (additional)
Off-Grid Inverter
Backup Generator (optional)
Solar Charge Controller
Solar charge controllers are also known as charge regulators or just battery regulators. The last term is probably the best to describe what this device actually does: Solar battery chargers limit the rate of current being delivered to the battery bank and protect the batteries from overcharging.
Good charge controllers are crucial for keeping the batteries healthy, which ensures the lifetime of a battery bank is maximized. If you have a battery-based inverter, chances are that the charge controller is integrated.
Battery Bank
Without a battery bank (or a generator) it’ll be lights out by sunset. A battery bank is essentially a group of batteries wired together.
DC Disconnect Switch
AC and DC safety disconnects are required for all solar systems. For off-grid solar systems, one additional DC disconnect is installed between the battery bank and the off-grid inverter. It is used to switch off the current flowing between these components. This is important for maintenance, troubleshooting and protection against electrical fires.
Off-Grid Inverter
There`s no need for an inverter if you`re only setting up solar panels for your boat, your RV, or something else that runs on DC current. You will need an inverter to convert DC to AC for all other electrical appliances.
Off-grid inverters do not have to match phase with the utility sine wave as opposed to grid-tie inverters. Electrical current flows from the solar panels through the solar charge controller and the bank battery bank before it is finally converted into AC by the off-grid-inverter.
Backup Generator
It takes a lot of money and big batteries to prepare for several consecutive days without the sun shining (or access to the grid). This is where backup generators come in.
In most cases, installing a backup generator that runs on diesel is a better choice than investing in an oversized battery bank that seldom gets to operate at it`s full potential. Generators can run on propane, petroleum, gasoline and many other fuel types.
Backup generators typically output AC, which can be sent through the inverter for direct use, or it can be converted into DC for battery storage.
Hybrid Solar Systems
Hybrid solar systems combines the best from grid-tied and off-grid solar systems. These systems can either be described as off-grid solar with utility backup power, or grid-tied solar with extra battery storage.
If you own a grid-tied solar system and drive a vehicle that runs on electricity, you already kind of have a hybrid setup. The electrical vehicle is really just a battery with wheels.


Advantages of Hybrid Solar Systems
1. Less expensive than off-gird solar systems
Hybrid solar systems are less expensive than off-grid solar systems. You don`t really need a backup generator, and the capacity of your battery bank can be downsized. Off-peak electricity from the utility company is cheaper than diesel.
2. Smart solar holds a lot of promise
The introduction of hybrid solar systems has opened up for many interesting innovations. New inverters let homeowners take advantage of changes in the utility electricity rates throughout the day.
Solar panels happen to output the most electrical power at noon – not long before the price of electricity peaks. Your home and electrical vehicle can be programmed to consume power during off-peak hours (or from your solar panels).
Consequently, you can temporarily store whatever excess electricity your solar panels in batteries, and put it on the utility grid when you are paid the most for every kWh.
Smart solar holds a lot of promise. The concept will become increasingly important as we transition towards the smart grid in the coming years.

Equipment for Hybrid Solar Systems
Typical hybrid solar systems are based on the following additional components:
Charge Controller
Battery Bank
DC Disconnect (additional)
Battery-Based Grid-Tie Inverter
Power Meter

Battery-Based Grid-Tie Inverter
Hybrid solar systems utilize batter-based grid-tie inverters. These devices combine can draw electrical power to and from battery banks, as well as synchronize with the utility grid.
The bottom line is this: Right now, for the vast majority of homeowners, tapping the utility grid for electricity and energy storage is significantly cheaper and more practical than using battery banks and/or backup generators.

Overview Solar Inverters

Inverters are an integral part to any solar PV system, and are responsible for converting the DC electricity generated by solar panels into AC electricity that can be utilised in your home or sent to the grid. While different inverter products may have distinct features and characteristics, they must perform the DC to AC conversion to be considered an inverter.
To learn more about the different types of inverters available, and find out which is the right choice for your needs, read on.

Standard String Inverters

Standard string inverters are the most commonly installed inverter type worldwide.. The DC electricity generated by solar panels is fed into this central inverter, which converts this electricity into AC electricity.

✓ Pros
With millions of string inverters installed around the world, the technology behind standard string inverters is reliable and efficient.

✘ Cons
A standard string inverter by itself does not allow for battery integration. You’ll need to install a separate battery inverter. Depending on which inverter you opt for, you may be required to purchase an additional energy management system to increase your system’s efficiency.

Micro Inverters

Like their named suggests, micro inverters are much smaller in size and capacity than standard string inverters. While the latter range from 0.25 to 5kW in size for residential applications, micro inverters are usually around 250W to 500W in size.
Instead of one central inverter that converts all the DC electricity your panels collectively produce, micro inverters are usually installed on the back of every individual panel, and are only responsible for the conversion of the panel on which they are installed.

✓ Pros
Micro inverter solar PV systems usually perform better than standard string inverter systems. As every panels output is collected individually, underperforming panels (whether due to shading or degradation) do not negatively impact the output of other panels.

✘ Cons
Micro inverters are significantly more expensive than standard string inverters.

Battery Inverters

Battery inverters are responsible for the charging and discharging of the electricity stored in a solar battery. Battery inverters are often installed alongside a standard string inverter, which it will AC couple or “talk” with.

✓ Pros
Thanks to a long history of research and development similar to standard string inverters, good quality battery inverters are robust and hard-wearing.

Battery inverters can often be retrofitted easily and quickly into existing solar PV systems.

✘ Cons
Although it’s dependent on your state’s network, the rules surrounding retrofitting battery inverters can sometimes be complicated and expensive. While the act of retrofitting is simple, gaining the approvals to do so can be complex.

Retrofitting a battery inverter in the future will usually cost more than installing a hybrid inverter when initially purchasing your system.

Hybrid Inverters

Hybrid inverters perform the same function as standard string inverters and battery inverters. Not only can a hybrid inverter convert the DC electricity into AC electricity your home can use, it can also charge and discharge your solar battery bank.

✓ Pros
Hybrid inverters present a more seamless and cost-effective solution than installing both a standard string and battery inverter.
The majority of hybrid inverters can be installed without a battery. This gives you the flexibility to retrofit a solar battery at a later date, when it might suit your circumstances better.

✘ Cons
Because hybrid inverters perform two integral function, they can be less efficient than standard string or battery inverters.

Grid-Tie Inverters

Grid-Tie inverters are simply inverters which are connected to the grid. Without getting too technical, these inverters produce a pure sine wave that is congruent with the AC waveform produced by the grid.
This allows you to send any unused, surplus solar electricity your system has generated back into the grid, which you may or may not receive a feed-in tariff for. (This depends on your electricity provider and the country you reside in.)
In the majority of cases and for most states, it’s a requirement that the inverter you install is grid-tied, whether it’s string, hybrid, or micro.

Off-Grid Inverters

Like standard string inverters, off-grid inverters are responsible for the conversion of DC electricity generated by your system’s panels into AC electricity that can be used by the appliances in your home.
Unlike standard string inverters however, they do not have the ability to export excess solar electricity into the grid. Off-grid inverters are used in either remote areas, or where the homeowner wants to separate entirely from the grid.

✓ Pros
An off-grid inverter system means your home is no longer susceptible to power outages caused by the grid, giving your home greater energy independence.
Some off-grid inverters come with a built-in AC charger option, that not only allows you to connect a backup generator, but also charge a battery.

✘ Cons
Deciding to go off grid is a costly procedure and will often require total disconnection from the grid. This can be hard to undo, so you’ll need to consider the future implications (re-sale value of your home, future energy needs, etc).

You may also need to invest in a diesel generator which can be extremely costly, and become much more conscious of your energy usage to avoid your system tripping from an overload.





SMA Sunny Boy B 5.0-1AV-40

Tripower STP 25000TL-30

SMA Sunny Island 8.0H


PVI-3.0-TL-OUTD-S INT with DC switch




Fronius Symo light 5.0-3-M

Fronius Symo light 15.0-3-M

Fronius Symo light 20.0-3-M



KACO Powador 7.8 TL3

KACO Powador 60.0 TL3



Envertech EVT248
Micro - Inverter

Envertech EVT500
Micro - Inverter



LI 7S 6.8kWh FOR SMA


LI 7S 13.6kWh FOR SMA


LI 7S 40.8 KWh FOR SMA



Weida HXG12-200
(Gelled Electrolyte)

Weida OPzS2-3000

Weida OPzV2-2500



Fronius Solar Battery 4.5

Fronius Solar Battery 6.0

Fronius Solar Battery 10.5



Hoppecke 3 OPzV Bloc Solar.Power 180 / 12V

Hoppecke 5 OPzS Solar.Power 520 / 24V

Hoppecke 12 OPzV Solar.Power 1500 / 24V


On Grid and Off Grid Explained

On Grid – Save Money

ongrid systeml

All on grid systems worldwide require a working grid connection to function. In case of a powercut, the system will not function for safety reasons.

On Grid Plus – Save Money + Power Cut Protection

ongrid plus small

This is on grid but with the benefit of battery backup to protect against power cuts. During a power cut you have power in the batteries sufficient to run a cut-down list of the appliances in your house for a period of time.

Off Grid – Power Anywhere anytime!

offgrid system

Off Grid systems are for places with no possible connection to the grid.


Read more ...


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