Air Conditioner Standby using 300W

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Re: Air Conditioner Standby using 300W

Postby Bthree » Sun Nov 03, 2013 10:16 pm

davidg wrote: not really an issue I reckon, to save those extra bucks.


Our 8 year old Carrier (draws about 5.5KW when running) has a heater that uses approx. 55-60 watts all year round. I am told it is switched off only when the compressor is running.
My calculation works that out at about 300+ KWH per year give or take, that's not excessive you think ?
Been through this earlier in this thread and I am not game to risk a burnt out compressor.
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Re: Air Conditioner Standby using 300W

Postby Tracker » Mon Nov 04, 2013 7:16 am

Bthree wrote:Been through this earlier in this thread and I am not game to risk a burnt out compressor.


But why... how often and when do you use the RAC..

I would look at measuring the temp of the case at different times of the year.. eg ..in winter if the case was 30 degree, then you could use a thermostat to disconnect the heater whenever the temp was over 30deg.
Fit a thermostat that switches on at 30c, enabling operation (ie. At a time after turn on)
Or fit a switch outside the prevents accidental operation, because the heater was disconnected..

There has to be practical ways.. eg fitting more heaters and disconnecting them all until needed ... then turning them ON, , a time before being needed and a thermostat to disconnect at 30c..
(Does the specifications suggest what the case temp MUST be b4 operating..?

300kWH a year is like running a beer fridge for that time.. :D
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Re: Air Conditioner Standby using 300W

Postby jimbo » Mon Nov 04, 2013 7:22 am

I wouldn't be worried with temps unless maybe under 5-10 degrees and that's conservative.
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Re: Air Conditioner Standby using 300W

Postby davidg » Mon Nov 04, 2013 7:46 am

Bthree wrote:My calculation works that out at about 300+ KWH per year give or take, that's not excessive you think ?

That's about $90.00 a year. :shock:

We just turn our 14kw+ A/C off at the CB, before we want to use it we turn on the power on in the morning, when it gets hot enough inside just use it after that. Most of the year though it uses no power at all. That's quite few hours of A/C for that standby power cost.

You could create a warning light CCT arrangement if really concerned, we didn't think it worth doing.
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Re: Air Conditioner Standby using 300W

Postby jimbo » Mon Nov 04, 2013 8:00 am

I'm fairly sure the sump heater is for winter use. If it's hot enough outside to need AC then I'm pretty sure the oil will be up to temp.
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Re: Air Conditioner Standby using 300W

Postby davidg » Mon Nov 04, 2013 8:07 am

jimbo wrote:I'm fairly sure the sump heater is for winter use. If it's hot enough outside to need AC then I'm pretty sure the oil will be up to temp.


I think your right I just don't want to take a chance, as your aware oil is not compressible. A couple of hours preheat if it wants to do it guards against any chance of a possible problem. ;) also since it's during summer the Solar is pumping out lots of power, a few watts from the system is fine. 8-)
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Re: Air Conditioner Standby using 300W

Postby Tracker » Mon Nov 04, 2013 8:17 am

jimbo wrote:I'm fairly sure the sump heater is for winter use. If it's hot enough outside to need AC then I'm pretty sure the oil will be up to temp.

I would bet it s on 24/7 , even in summer, and even if the running current is massively more, it still adds up.
But... if all your power is from solar and the incremental cost is zero, then that is different.. having to use dump loads perhaps makes the dump heater a benefit.. :-)
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Re: Air Conditioner Standby using 300W

Postby jimbo » Mon Nov 04, 2013 8:26 am

Agreed with both above.

Sorry with my comment I meant it's intended use is probably for winter times when the unit will be used for heating but your right to keep things simpler and cheaper for them it's probably hard wired 24/7.
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