Aplogies for the silly question, but I'm having a senior moment and cannot for the life of me think how to do the calculation!

A site 240 volt power supply is listed as 10 amps.

We plug in a 1kw (1000watt) fan heater and have the water heater on, which draws another 1kw (hypothetical). Add two 40 watt lights and two 60 watt heat tubes. So we're using 2200watts (2.2kw)

What percentage of the available power are we using? 

here you go matey.

The results are based on a uk supply rated at 230 volts 

60 Watts    =    0.26 Amp

100 Watts    =    0.43 Amp

200 Watts    =    0.87 Amp

300 Watts    =    1.30 Amp

400 Watts    =    1.74 Amp

500 Watts    =    2.17 Amp

600 Watts    =    2.61 Amp

700 Watts    =    3.04 Amp

800 Watts    =    3.48 Amp

900 Watts    =    3.91 Amp

1000 Watts    =    4.35 Amp

1100 Watts    =    4.78 Amp

1200 Watts    =    5.22 Amp

1300 Watts    =    5.65 Amp

1400 Watts    =    6.09 Amp

1500 Watts    =    6.52 Amp

1600 Watts    =    6.96 Amp

1700 Watts    =    7.39 Amp

1800 Watts    =    7.83 Amp

1900 Watts    =    8.26 Amp

2000 Watts    =    8.70 Amp

2100 Watts    =    9.13 Amp

2200 Watts    =    9.57 Amp

2300 Watts    =    10.00 Amp

2400 Watts    =    10.43 Amp

2500 Watts    =    10.87 Amp

2600 Watts    =   11.30 Amp

2700 Watts    =   11.74 Amp

2800 Watts    =    12.17Amp

2900 Watts    =   12.61 Amp

3000 Watts    =    13.04 Amp

3100 Watts    =    13.48 Amp

3200 Watts    =    13.91 Amp

3300 Watts    =    14.35 Amp

3400 Watts    =    14.78 Amp

3500 Watts    =    15.22Amp

3600 Watts    =    15.65 Amp

Beat me to it, Pete

It looks like your 2.2kw of power is your limit on a 10 amp supply and it would be best to keep it a little lower than that if possible as a safety margin.

Watts divided by Volts = Amps

That's the calculation!

Thanks lads, super...........

I did the sum a while back using the watts described and that came out near the 10 amp rating but I couldn't remember how I got there.

Just like life really; I can't remember how I got where I am sometimes!!

Quote: Originally posted by DaveS1 on 31/1/2016

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And don't forget that on some very crowded continental sites the voltage may well drop to, say, 220 volts which will increase the amperage taken slightly.
DaveS1

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