Can 20 year compressor overheat the 20V?

[Joshua Van Tol]

I've heard figures as high as 7hp, but I think that was for very large
systems in SUVs. But 2-3 hp is about right.

Josh

On Mon, Jul 30, 2012 at 3:07 PM, Huw Powell <audi at humanspeakers.com> wrote:

> So we are talking 2-3 hp depending on conversion efficiency.
>
>
> On 7/30/2012 3:44 PM, Joshua Van Tol wrote:
>
>> Most auto ac units are rated more like 15-20k btu. Heat gain is
>> ferocious because of the windows, and poor insulation.
>>
>> Efficiency isn't a priority, and most systems run fresh air all the
>> time, unless forced into recirc.
>>
>> Josh
>>
>> On Mon, Jul 30, 2012 at 2:03 PM, Huw Powell <audi at humanspeakers.com
>> <mailto:audi at humanspeakers.com**>> wrote:
>>
>>     Just to play with numbers a bit...
>>
>>     a 6500 BTU house window unit, recommended for a 250 sq ft room would
>>     use about 50 amps on 12 volts:
>>
>>     5.7 a at 110 v = 627 w
>>
>>     627 w at 12 v = 52.25 a
>>
>>     To make a huge assumption, that running one off house AC is roughly
>>     as efficient as running the compressor directly, that's like adding
>>     "half an alternator on full load".
>>
>>     Plus whatever the interior fan uses on "high cool" mode.
>>
>>     So while it is certainly a load on the engine, it shouldn't feel
>>     like towing a trailer.
>>
>>     Another random note, the numbers above are for a new, modern, Energy
>>     Star* AC unit.  The 20 year old system under discussion is probably
>>     less efficient to start with, and might be quite a bit worse by now.
>>
>>     *My new (ten years ago) Energy Star refrigerator was about 30%
>>     larger than the late 70s era unit it replaced, and my electric bill
>>     went down $20 a month (135 kwh at my nuclear rates).  Your mileage
>>     may vary.  It might not be possible to match modern efficiencies of
>>     that sort in an automotive system, especially a retrofit.
>>
>>
>>     On 7/30/2012 2:35 PM, George Selby wrote:
>>
>>         At 01:56 PM 7/30/2012, you wrote:
>>
>>             Regarding the drag: my compressor is pumping fine, but when
>>             it turns
>>             on, it
>>             feels like I'm hauling another type44 on my back. Any remedy
>>             for this?
>>
>>
>>         Double the boost?
>>
>>         In actuality AC is a huge drag on the engine (Maybe not in
>>         Canada, but
>>         down here in the southern US it is.)  Due to losses in converting
>>         energy, the engine bay probably sees 4 times as much heat added
>>         when the
>>         AC is engaged as is removed from the interior.  And most auto AC
>>         systems
>>         do produce an icy blast, in fact the average car system would
>> cool a
>>         house quite well.
>>
>>
>>         George Selby
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