How to select a Wind Turbine and Battery Bank
(1) Determine the Electricity Consumption of Household Appliances
The rated power (watts) is listed on the nameplate of each of your household
appliances. Read what the rated power (watts) is on each of your appliances, then
multiply that number by the average daily use time (hours). This gives you the ‘draw
power’ consumption (WH).
For example, the household appliances are: Television 120 watts, Refrigerator 340
watts, and Air Conditioning, 1000 watts and the Average Daily use of time is 7 hours. In
this case scenario, the user's total electricity consumption is (120 +340 +1000) W x 7 H
(2) Determine the Local Average Wind Speed and Windy Time
You will need to check both the Average Wind Speed and the Average Daily Windy Hours
for the region the wind turbine generator will be installed. This varies from region to
region. (You should be able to search online for your local meteorological information).
You will need this information for the wind formula below to make your choice of which
wind generator would be best for you and your application.
For example, the user determines the average wind speed and windy time as follows:
Local average daily wind speed 8 M / S, the average windy time of 8 hours.
(3) Select the best match wind turbines according to the average wind
speed and windy time
Although there are many theoretical formulas that can be referenced during selection
of wind turbine, the actual situation and practice experience are still very important.
One of the methods is to compare the generating power / wind speed curve of the wind
turbine to determine the correct wind turbine.
Following above example:
Select WG3000, from the rated wind speed /power curve. It shows it has 1300 watts of
power at 8 S/M wind speed. The daily total generating capacity of the WG3000. So the
formula would be: 1300WX 8H = 10400WH, basically equal to or slightly greater than
the user's home appliance consumption.
Please Note: It is Not true to assume that the greater the power of the wind generator
selected…the greater the electricity and the better it will meet the users’ needs. Only
when the Average Wind Speed is close to the wind generator’s ‘rated’ wind speed will
you obtain maximum efficiency. You should choose the wind turbine generator that
has the right power generation performance that best fits the local average wind speed
range in your region.
4) How to choose the battery
Because of the intermittent and instability of generating power, the wind turbine can
not directly supply the power to the household appliances. The battery can provide the
stable and constant power for household appliances as electrical energy storage.
How to achieve a reasonable match between the wind turbine power and the battery,
during a windy time or non-windy time, is a very important issue. We believe it is
important to match the small wind turbine and battery capacity so that the input
of battery and output of wind turbine are equal to or greater than the output of the
principle of matching.
We’d like to recommend the following volume capacity of battery bank:
Model of Wind Turbine: Battery Bank
WG400, WG450: 12V / 120AH x 2-3 pcs
WG700,WG800 WG1000: 12V / 150AH x 3 pcs
Or 12V / 200AH x 2 pcs
WG1500: 12V/200AH x 3-4 pcs
WG3000: 12V/200AH x 4-6 pcs
WG4500: 12V/200AH x 8-10 pcs
According to the length of the windy period:
In an area where windy periods are short, the small-capacity battery bank is an option.
In an area where windy periods are longer, the high-capacity battery bank is
If you set up the wind turbine generator with more affluent generation capacity, it is
necessary to choose a larger capacity battery bank.
If the power generation system is not 12V, it can be combined into a system voltage
of the battery arranged in series, such as 24V or 48V, but the total battery capacity is
It is easy to cause the following problem if the battery's capacity can’t; be selected
(1)When the battery capacity is too large, the wind turbine can not be guaranteed
to fully charge the battery, resulting in waste of battery resources, and a higher
(2) When the battery capacity is too small, the wind turbines frequently start the
overcharge protection as soon as the battery is fully charged. This will seriously lower
the efficiency of the wind turbine and shorten the battery bank’s life.
The proper use of the controller and the inverter ensures that the wind turbine’s
operation is in optimized condition. Make sure that the rated power of the controller
and the inverter are greater than the maximum power generation of the wind turbine,
and the load power of household appliances.