Btus And Electricity Question

[Captain Haddock]

How many BTUs should I be looking at for two rooms at 15 square metres each? One AC in each room. And as I plan on redoing the wiring, what ampage/amperage should I go for with 2 ACs, 1 washing machine, iron, 4 TVs, 2 PCs + monitors, lights, electric shower, 3 water pumps and 2 fridges?

Cheers.

[Rimmer]

15 sq mtrs multiplied by 600 = 9000 btu

2.5mm for your normal cables. The air con's can be the same size cable but would be better on seperate circuits with their own breakers.

[mdechgan]

I would go with 12,000 btu. Normally I use 750 btu per sqM.

The price and amps don't differ that much.

The coil sizes are the same only the accurator and compressor differ.

I know because I work in this field.

SCI compressors for 9,000 btu run at about 4.5 amps while the SCI RH207 run at about 6 amps.

However the 12,000 btu unit will cool and cut out more quickly and turn on less frequently while the 9,000 btu will stay on longer.

The only reason to use a 9,000 btu is if the room is really cool. I mean no direct sunlight, very good insulation and no leakage. Also if the the room is no higher than the 1st floor and the roof has adequate insulation and venting. No tin or concrete roofs. Also if no more than 1 -2 people in the room and solely used at night while sleeping. If it a living room go with the 12,000 btu.

Go for the 4mm wires if the source of power is any longer than 20M to prevent voltage drops at start. The unit draws twice as much current at start. Run different circuits to each a/c also. Don't connect to the same wire.

[Captain Haddock]

Wow! Thanks for the replies folks.