Next message: Larry D Owens: "Re: lv-ab: Charleston"
One of the major problems with this setup is the startup current
required by the compressor. I tied this once with a 2600 (1800
continuous) heart inverter and a 6000 btu reverse air. It would not
start the unit but would run the unit. I started it with generator
power and ran it off the inverter. Next problem was after it satisfied
the demand it would shut down and would not restart.
Not a real practical method of cooling. Try a small box fan and a quick
shower. Works wonders.
Jerry
The Marchands wrote:
>
> Bob:
>
> I had a 35' sailboat in Galveston Bay with a 16,000 BTU A/C. This unit would
> barely keep up on a hot summer's day, but would be loafing in the evening. A
> lot depends on shading and head liner insulation. You can probably get by
> with 12,000 BTU on your 28' boat.
>
> Boat air conditioners roughly draw 1 amp at 115 v for each thousand BTU/hr
> of capacity. Whether you can run your a/c from an inverter depends on how
> long and when. To try to run a 12,000 btu/hr a/c for 24 hours on a hot
> Florida summers day on a battery/inverter system is practically infeasible.
> To run it for 8-10 hours overnight might be possible.
>
> Here are some numbers for the latter situation: 10 hrs x 12 amps x 115 v x
> 0.5 service factor (the time the unit cycles on and off) = 6900 watt hours
> AC. 6900 watt hours would equal 6900 div 12 volts div 0.9 efficiency = 640
> amp hours DC. To supply 640 amphours DC, you are going to need a battery
> bank of at least 1280 amphours so you don't discharge it below 50% for
> decent life. This is about a dozen group 27 12v batteries at about 40 lbs
> each or about 500 lbs of batteries. A 2000 watt inverter would handle this
> load adequately.
>
> To recharge 640 amp hours would require more than 4 hours of charging with a
> high output, large case alternator charging at 150+ amps (see Balmar's web
> site at www.balmar.net).
>
> So, it may be feasible, but it doesn't seem too practical. If all you want
> to do is cool the forward cabin at night, you might install a separate 6,000
> BTU/hr A/C for only that cabin. The foregoing numbers should drop in half.
> That might be getting into the realm of practicality.
>
> David
>
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Jerry Donofrio Sr.
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