| Good
reasons to buy inverters from Marine Direct Australia:
We care about every order.
We follow up when required.
We have a wide range of the products and communicate with the
importers.
We offer old fashioned service using the latest technology! |
 |
How to choose the suitable size of Inverters
Before you decide what size Inverter you want to
buy, you first need to consider the total amount of wattage used by your
appliances. This is not allowed to be higher than the wattage of the Inverter,
especially for some of the appliances (such as TV, fridge), their starting power
is several times or even ten times bigger than normal operating power. For this
situation, it's necessary to use it as the maximum amount of wattage. The
following are the list of wattage usages of some of the appliances you often use
for your references. Because there are differences among different models made
by different manufacturers, it's better to use the parameters given by the
manufacturers.
A) Appliance without
large starting power
|
Appliance Items |
Wattage Draw |
|
Appliance Items |
Wattage Draw |
|
Cordless drill charges |
6 W |
Food Processors |
500 W |
|
TV games |
10 W |
Bread Makers |
550 W |
|
VCR or DVD Players |
25 W |
Coffee Maker |
800 W |
|
Lights |
25 ~ 100 W |
Toasters |
1000 W |
|
Electric Fans |
60 W |
600 W Microwave |
1200 W |
|
Laptop Computers |
60 W |
700 W Microwave |
1400 W |
|
Nebulizer |
120 W |
Kettle |
2200 W |
|
Sewing Machine |
120 W |
|
|
B) Appliances need large starting power
|
Appliances Items |
Normal Draw |
Starting Power |
|
14" TV |
70 W |
200 W |
|
17" TV |
85 W |
250 W |
|
20" TV |
90 W |
280 W |
|
Bar Fridge |
80 W |
800 W |
|
Power Tools |
450W ~ 1200W |
1000W ~ 2500W |
|
|
|
|
PS: |
In the specifications, the
surge power described can only last very short time. It's provided for
testing by engineers. The surge power is not big enough to start a TV or
fridge. The power of an inverter should be calculated based on its
continuous power. |
How long can I run with my battery?
The following is a simple formula:
|
How long
battery last (hour) = |
|
Battery
capacity (AH) x 10 |
|
divided by |
|
Appliance
Consumption (Watt) |
|
e.g. Run 14" TV & games with a 70 AH battery
|
70 AH |
|
divided by |
|
70 W +
10 W |
|
= 8.75 hours |
|
|
|
|
PS: |
Of course, there are
significant differences among the batteries of good quality and bad quality,
or new and old. Especially when you use your car battery as the power
supply, you have to keep enough power be able to start your car engine. |
What's the relationship between Wattage (W), Current (A) and Voltage (V)?
|
Current (A)
= |
|
Wattage
(W) |
|
divided by |
|
Voltage
(V) |
|
e.g. Run a 500 power tool from 12 V battery. It
draw 41.67 A from battery
