G
George Ghio
- Jan 1, 1970
- 0
What is a variable load.
This is a load which varies and can describe a light globe.
The load of a light globe is varied by turning it on or off.
It is a large variation as it goes from 0 to 100 %.
In fact all loads in a system will have the same parameters, 0 to 100 %.
Now Wayne says that to design a system you need to measure what is used
today to build a system for tomorrow.
Well let¹s see what can happen with such a system.
One house...Two people...total load 5kWh/day
Appliances in the house have a total potential of 10kWh/day under normal
use conditions.
Things run just fine for several weeks.
Auntie Agnes shows up with her three kids, the twins still in diapers,
and yes she still uses real diapers. Four loads of laundry a day, every
day for the four weeks of her visit.
Little Wayne who is four is parked in front of the TV for hours of
entertainment every morning and afternoon. When he is not watching
cartoons on Sky TV he is in and out of the house every five minutes,
leaving the door open every time.
Bottles of formula are in the microwave, morning, noon and twice over
night. Little Wayne won¹t sleep without a light on as well as leaving
lights on in every room he enters, day or night.
Impossible? Not by any means.
The chances of the system working for the four weeks?
I know which way I would bet.
Variable loads? Yep. They vary right up to 100%.
Design for 50% of the potential load and you will have 50% of the system
you need.
What to do, eh?
Well if you want a system that works you need to size it fo the load
that is possible. This means if the dishwasher has a max rating of X
watts and you know that it will run for an hour then the figure you use
for your sizing is X times one hour (X Whs) for that appliance.
There are people who will say ³But I never run it at its maximum². This
can be translated as ³I bought the wrong one².
Anyone can design a system for the wishful.
The thing is anyone can design a system (except Wayne apparently) to
handle the extras that crop up with a total disregard for wishes.
You only have to decide what sort of system you want.
This means that you have to know what you want to run.
And that means you have to be honest with yourself at every stage of the
project.
If you can¹t afford to run an appliance at its maximum the chances are
that you can¹t afford to run it at half either.
I know that a lot of you don¹t want to hear this sort of thing. Thing is
though, that when people start telling other people what they want to
hear you get a war over Weapons of Mass Destruction.
If you can¹t afford to run that dishwasher at its maximum buy a pair of
rubber gloves honestly rather than lie to yourself about only using the
air dry setting on the DW.
There is nothing more embarissing than a blackout during Christmas
dinner while bragging to the whole family about your solar power system.
This has been a public service announcment from that bastard in the bush.
This is a load which varies and can describe a light globe.
The load of a light globe is varied by turning it on or off.
It is a large variation as it goes from 0 to 100 %.
In fact all loads in a system will have the same parameters, 0 to 100 %.
Now Wayne says that to design a system you need to measure what is used
today to build a system for tomorrow.
Well let¹s see what can happen with such a system.
One house...Two people...total load 5kWh/day
Appliances in the house have a total potential of 10kWh/day under normal
use conditions.
Things run just fine for several weeks.
Auntie Agnes shows up with her three kids, the twins still in diapers,
and yes she still uses real diapers. Four loads of laundry a day, every
day for the four weeks of her visit.
Little Wayne who is four is parked in front of the TV for hours of
entertainment every morning and afternoon. When he is not watching
cartoons on Sky TV he is in and out of the house every five minutes,
leaving the door open every time.
Bottles of formula are in the microwave, morning, noon and twice over
night. Little Wayne won¹t sleep without a light on as well as leaving
lights on in every room he enters, day or night.
Impossible? Not by any means.
The chances of the system working for the four weeks?
I know which way I would bet.
Variable loads? Yep. They vary right up to 100%.
Design for 50% of the potential load and you will have 50% of the system
you need.
What to do, eh?
Well if you want a system that works you need to size it fo the load
that is possible. This means if the dishwasher has a max rating of X
watts and you know that it will run for an hour then the figure you use
for your sizing is X times one hour (X Whs) for that appliance.
There are people who will say ³But I never run it at its maximum². This
can be translated as ³I bought the wrong one².
Anyone can design a system for the wishful.
The thing is anyone can design a system (except Wayne apparently) to
handle the extras that crop up with a total disregard for wishes.
You only have to decide what sort of system you want.
This means that you have to know what you want to run.
And that means you have to be honest with yourself at every stage of the
project.
If you can¹t afford to run an appliance at its maximum the chances are
that you can¹t afford to run it at half either.
I know that a lot of you don¹t want to hear this sort of thing. Thing is
though, that when people start telling other people what they want to
hear you get a war over Weapons of Mass Destruction.
If you can¹t afford to run that dishwasher at its maximum buy a pair of
rubber gloves honestly rather than lie to yourself about only using the
air dry setting on the DW.
There is nothing more embarissing than a blackout during Christmas
dinner while bragging to the whole family about your solar power system.
This has been a public service announcment from that bastard in the bush.