After Sales Service Policy

We provide 2 years warranty for all of our products dated from shipment. 2% of easy damaged components including PCBA,

fuse, circuit brakes, displayer are usually included for all shipment. Specific requirement of spare parts are also welcome

subject to prior confirmation with sales persons. Service manual and or videos are available subject to request. For serious

batch quality problems, we are able to send engineering team on site to guide and make service if necessary.


Service Videos

How to Replace the Control PCB of Automatic Voltage Regulator

How to Replace the mother PCB of  Automatic Voltage Regulator

How to replace the fuse of inverter?

Common Knowledge of Product

Power problems can occur in two forms:
· problems or disturbances that occur with a mains supply. Here we are concerned with Power Quality issues.
· when the mains supply completely fails. Here we are concerned with how to keep systems running and business continuity.

Power supply problems are caused by various sources, for example distribution network faults, system switching, weather and

environmental conditions, heavy plant and equipment or simply just faulty hardware. Regardless of the cause of the problem,

the result will include one or more of the following types of power problems:

Sags: are short duration decreases in the mains supply voltage which generally last for several cycles. They are one of the more

common forms of disturbances. When sags occur sensitive equipment can lock or hang causing data loss and system resets.
Surges: are short duration increases in the mains supply voltage which generally last several cycles. When surges occur equipment

can suffer from premature failure. The high voltage causes wear and tear and general component degradation. This may not be

noticeable until failure, though heat out is a good sign.
Transients and Spikes: these are very fast high energy surges lasting only a few milliseconds. When transients or spikes occur

equipment can lock or hang, crash and even suffer damage which inevitably causes data loss and corruption. Large transients can

occur from local or worst case a direct lightning strike.
Electrical Noise: this is a high frequency noise either common or normal mode which can cause severe disruption and damage to circuits and equipment.
Brownouts: are long term sags in the mains supply voltage which can last up to several days. During a brownout equipment can reset or even shutdown.
Blackouts and Mains Failures: when the mains supply fails completely this is known as a total mains failure or blackout. A break in the

mains supply of only several milliseconds is sufficient enough to crash, lock or reset many of the components that make up a typical data

or voice processing IP network, such as PC, terminal, console, server, PBX, printer, modem, hub or router.
A survey can be used to identify the types, duration and magnitude of power problems experienced on a site.

Power problems cause voice and data processing errors, hardware damage and expensive downtime. When an Uninterruptible Power

Supply (UPS) as your power protection solution it is important to consider two elements:

· How clean is my mains supply when it is present ?
· Does the application need to be kept running when the mains fluctuates wildly or fails and if so for how long ?

Power Quality without battery back-up
Solutions vary in the power quality they provide and include:

A filter will attenuate spikes and electrical noise down to predefined levels. A very basic economic form of power protection.

Transient Voltage Surge Suppressors (TVSS)
A TVSS will clamp and divert the excess electrical energy of transients away from downstream loads. A TVSS is superior to a filter and can cope

with lightning strike surges in some instances. They are commonly used within heavy industrial complexes and mobile base stations. When placed

before Uninterruptible Power Supplies a TVSS will provide protection for the Uninterruptible Power Supply itself from local transient surges.

Automatic Voltage Regulator
Smooth out sags, surges and brownouts in an attempt to provide a near stable supply and are typically used in combination with a filter. They

provide a form of power protection used typically in third world countries for non-critical loads such as fridges and freezers. A voltage stabiliser

(also known as an Automatic Voltage Stabiliser or AVR) can be electronic or electro-mechanical.

Power Conditioners
The ultimate power protection without battery back up. They can be either transformer or electronic based and provide conditioning in the form

of filtering, stabilisation and regulation. Some power conditioners can also provide Galvanic isolation. This is more commonly associated with Constant Voltage Transformers (CVTs).

Categories of Uninterruptible Power Supplies (UPS)

Offline / standby

Offline / standby UPS. Typical protection time: 0–20 minutes. Capacity expansion: Usually not available
The offline / standby UPS (SPS) offers only the most basic features, providing surge protection and battery backup. The protected equipment is normally

connected directly to incoming utility power. When the incoming voltage falls below a predetermined level the SPS turns on its internal DC-AC inverter

circuitry, which is powered from an internal storage battery. The SPS then mechanically switches the connected equipment on to its DC-AC inverter output.

The switchover time can be as long as 25 milliseconds depending on the amount of time it takes the standby UPS to detect the lost utility voltage. The UPS will

be designed to power certain equipment, such as a personal computer, without any objectionable dip or brownout to that device.


Line-interactive UPS. Typical protection time: 5–30 minutes. Capacity expansion: Several hours
The line-interactive UPS is similar in operation to a standby UPS, but with the addition of a multi-tap variable-voltage autotransformer. This is a special

type of transformer that can add or subtract powered coils of wire, thereby increasing or decreasing the magnetic field and the output voltage of the transformer.
This type of UPS is able to tolerate continuous undervoltage brownouts and overvoltage surges without consuming the limited reserve battery power.

It instead compensates by automatically selecting different power taps on the autotransformer. Depending on the design, changing the autotransformer

tap can cause a very brief output power disruption,which may cause UPSs equipped with a power-loss alarm to "chirp" for a moment.
This has become popular even in the cheapest UPSs because it takes advantage of components already included. The main 50/60 Hz transformer used to

convert between line voltage and battery voltage needs to provide two slightly different turns ratios: one to convert the battery output voltage (typically a

multiple of 12 V) to line voltage, and a second one to convert the line voltage to a slightly higher battery charging voltage (such as a multiple of 14 V) Further,

it is easier to do the switching on the line-voltage side of the transformer because of the lower currents on that side.
To gain the buck/boost feature, all that is required is two separate switches so that the AC input can be connected to one of the two primary taps, while the load

is connected to the other, thus using the main transformer’s primary windings as an autotransformer. The battery can still be charged while "bucking" an overvoltage,

but while "boosting" an undervoltage, the transformer output is too low to charge the batteries.
Autotransformers can be engineered to cover a wide range of varying input voltages, but this requires more taps and increases complexity, and expense of the UPS. It is

common for the autotransformer to cover a range only from about 90 V to 140 V for 120 V power, and then switch to battery if the voltage goes much higher or lower than that range.
In low-voltage conditions the UPS will use more current than normal so it may need a higher current circuit than a normal device. For example to power a 1000-watt device

at 120 volts, the UPS will draw 8.32 amperes. If a brownout occurs and the voltage drops to 100 volts, the UPS will draw 10 amperes to compensate. This also works in

reverse, so that in an overvoltage condition, the UPS will need less current.

Double-conversion / online

The online UPS is ideal for environments where electrical isolation is necessary or for equipment that is very sensitive to power fluctuations. Although once previously

reserved for very large installations of 10 kW or more, advances in technology have now permitted it to be available as a common consumer device, supplying 500 watts

or less. The initial cost of the online UPS may be slightly higher, but its total cost of ownership is generally lower due to longer battery life. The online UPS may be necessary

when the power environment is "noisy", when utility power sags, outages and other anomalies are frequent, when protection of sensitive IT equipment loads is required,

or when operation from an extended-run backup generator is necessary.
The basic technology of the online UPS is the same as in a standby or line-interactive UPS. However it typically costs much more, due to it having a much greater current

AC-to-DC battery-charger/rectifier, and with the rectifier and inverter designed to run continuously with improved cooling systems. It is called a double-conversion UPS due

to the rectifier directly driving the inverter, even when powered from normal AC current.
In an online UPS, the batteries are always connected to the inverter, so that no power transfer switches are necessary. When power loss occurs, the rectifier simply drops

out of the circuit and the batteries keep the power steady and unchanged. When power is restored, the rectifier resumes carrying most of the load and begins charging the

batteries, though the charging current may be limited to prevent the high-power rectifier from overheating the batteries and boiling off the electrolyte.
The main advantage to the on-line UPS is its ability to provide an electrical firewall between the incoming utility power and sensitive electronic equipment. While the standby

and line-interactive UPS merely filter the input utility power, the double-conversion UPS provides a layer of insulation from power quality problems. It allows control of output

voltage and frequency regardless of input voltage and frequency.

Categories of Automatic Voltage Regulator

Relay control type Automatic Voltage regulator

Servo motor Control type Automatic voltage regulator

IGBT control type automatic voltage regulator

Categories of of Inverter

True Sine wave inverter

Modified sine wave inverter

Solar Inverter

Knowledge of Solar Inverter

Introduction to Solar in Non-Technical Terms

There are four major components to solar electric systems; Solar Panels, Charge Controllers, Batteries and Inverters. All of these components are necessary to have a

functioning Solar Electric (PV) system. The solar panel is the basic building block of the system. This is your battery charger. If you have several solar modules wired together

you have created a solar array. The size of the solar array determines the amount of power or energy that will be produced. Your location is also a factor in the amount of energy

produced. If you live in Florida, Southern California, or Texas you will produce more than if you live in Oregon, Maine or Maryland. In general the closer to the equator you live

your system will produce a larger amount of energy. Charge controllers come in many different sizes and types. They all basically do the same thing. The charge controller prevents

the solar panel or array from overcharging your battery. Batteries are the energy storage for your system. Without batteries there is no way to store the energy your solar panels

produce during the day. Typically loads receive their power from batteries instead of directly from the output of a solar panel. A solar panel produces a high voltage that will

damage electronics if loads are powered directly. A common application for solar panels directly powering a load is water pumping. Instead of storing energy you store water.

This way you can pump during the day and have water all night. Batteries will provide you with the energy you need at night. The last major component is the Inverter. The inverter

converts the DC energy stored in your batteries and turns it into the AC power you use in your home. Inverters are rated by wattage and the quality of their output. You can use a

50 watt inverter that plugs into your car 12 volt outlet to power a computer, or you could have a 4000 to 11,000 watt inverter system that powers your home. These major components

can be put together in many different ways. Minor components like wire, disconnects, circuit breakers, and fuses are also needed for a complete system.

Introduction of how these different components are used in systems

Stand Alone or "Cabin" Systems

Solar/ Charge Controller/ Battery/ Inverter/ AC Loads
Solar/ Charge Controller/ Battery/ DC Loads
A Stand Alone solar system is just as it sounds. It is not connected to the utility or other types of charging sources. This type of system is used when utility power is not present

and is to costly to bring in from the nearest pole. If you have a shed set off from the house, a cabin in the mountains, or a summer home by the lake that is without power this

type of system can often be very cost effective. When compared to bring in the power lines the initial cost can be less. Some of the pros of this type of system are: The lack off

reliance on the utility. Potential cost savings. Some of the cons of this type of system are: Even thought there maybe a cost savings over running utility line, there can be a high

initial cost. You have to know your loads and have the system designed correctly since you don’t have utility power for backup.
Utility Tied System
Solar/ Inverter/ Utility
This system is the newest addition to our site. The system utilizes an inverter that does not require batteries. During the day, the power generated is fed back into the utility.

If you are producing more power then you are using your meter can even spin backwards. Due to the simplicity of the system, it has the lowest cost per watt. The downfall of

this system is that when the utility grid fails the system will shut down.
Battery Backup System
Utility/ Battery Charger/ Batteries/ Inverter/ AC Loads
This is a system that does not involve solar power. This system utilizing an inverter that has a built in battery charger. It will charges batteries and hold them at 100% waiting for

a power outage or a brownout. Your critical loads will never see the power outage. Computers, home health equipment, and lights will continue to operate when the utility

grid fails. This is a system that is great for areas where power is lost for short periods of time. The limit on this system is the amount of battery capacity that you have. T

he larger the batteries the longer your run time will be.
Utility Tied Battery Backup System with Solar