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    1. · Premium Member
      2016 3500 ext-ht
      Joined
      ·
      1,350 Posts
      The air conditioning question is answered in post #11, but perhaps not so clearly.

      Rough numbers it will take ~ 1 kW to run your air conditioner, so in 8 hrs,

      ( 8 hrs) x (1000 watts) ~ 8000 watt-hrs or 8 kW-hrs.

      To recharge in for instance 3 hrs from an aux alternator / 300+ amp size but I am not sure if this is viable for full time / daily use.

      It would be straightforward to do this in 2 hrs from an EV charge station if you have those in your area.

      Implementation of the hardware do this is in the $10-15 K range.
      Just wanted to say, my Dometic Penguin II draws between 180 amps on startup(even with Soft Start) to 150-170 amps steady with humidity @ 50% or less. I think/know it would not be less in humidity above 50%. I have a large battery bank and 1375 watts of solar. I think the estimates of power usage I see on the forum are low and not in line with what everyone is throwing around.

      Another thing I have noticed is the reluctance to use evaporative cooling. In the Southwest and Mountain States we run a portable 1300cfm evap cooler at less than 50% humidity and below 100⁰f and usually cools to a 30⁰f deltaT.

      Decent evap coolers however can use 1-1.5 GPH of water.


      Wide base, holds 4--5 gallons. Lives in our cargo trailer until we need it in the van or caravan tent.
      Skip the Durango model. Piece of garbage.
       
    2. · Registered
      Joined
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      1,952 Posts
      Just wanted to say, my Dometic Penguin II draws between 180 amps on startup(even with Soft Start) to 150-170 amps steady with humidity @ 50% or less. I think/know it would not be less in humidity above 50%. I have a large battery bank and 1375 watts of solar. I think the estimates of power usage I see on the forum are low and not in line with what everyone is throwing around.

      Another thing I have noticed is the reluctance to use evaporative cooling. In the Southwest and Mountain States we run a portable 1300cfm evap cooler at less than 50% humidity and below 100⁰f and usually cools to a 30⁰f deltaT.

      Decent evap coolers however can use 1-1.5 GPH of water.


      Wide base, holds 4--5 gallons. Lives in our cargo trailer until we need it in the van or caravan tent.
      Skip the Durango model. Piece of garbage.

      Thanks - the numbers I am using are from 2 different customers. One has a 170 sprinter in Louisiana and the other a 170 in the SF Bay area. They both are 48 volt systems using battleborn batteries. In one case it is 4 of them and the other is 8 of them.

      The owner in LA is getting ~ 3 hours from 4 batteries, so your estimate of 1.2 kW might be more accurate. I am using a very efficient 48 volt inverter so maybe that is a factor ?

      I agree though 1 kW is a minimum budget for hot weather. Anyone who thinks that a 12 volt system pulling 500 watts is going to make it comfortable inside is going to be disappointed.
       
    3. · Registered
      2017 136” HR
      Joined
      ·
      937 Posts
      Another thing I have noticed is the reluctance to use evaporative cooling. In the Southwest and Mountain States we run a portable 1300cfm evap cooler at less than 50% humidity and below 100⁰f and usually cools to a 30⁰f deltaT.

      Decent evap coolers however can use 1-1.5 GPH of water.


      Wide base, holds 4--5 gallons. Lives in our cargo trailer until we need it in the van or caravan tent.
      Skip the Durango model. Piece of garbage.
      Thanks for the recommendation, I just ordered the Hessaire MC18 to try it out for both my bedroom and the van. Southern California, low humidity most times. $189 @ Target, can return if I don’t like it. I’ll post my results after I tried it.
       
    4. · Registered
      Joined
      ·
      1,952 Posts
      Just wanted to say, my Dometic Penguin II draws between 180 amps on startup(even with Soft Start) to 150-170 amps steady with humidity @ 50% or less. I think/know it would not be less in humidity above 50%. I have a large battery bank and 1375 watts of solar. I think the estimates of power usage I see on the forum are low and not in line with what everyone is throwing around.

      Another thing I have noticed is the reluctance to use evaporative cooling. In the Southwest and Mountain States we run a portable 1300cfm evap cooler at less than 50% humidity and below 100⁰f and usually cools to a 30⁰f deltaT.

      Decent evap coolers however can use 1-1.5 GPH of water.


      Wide base, holds 4--5 gallons. Lives in our cargo trailer until we need it in the van or caravan tent.
      Skip the Durango model. Piece of garbage.
      Do you think the water usage numbers will really be that low? 1 - 2 GPH?

      I did some simple testing in my driveway. I know that it isn't the same thing but I tried to keep a ~ 10 x 10 sq ft section of concrete driveway cool by keeping it "damp" from water dripping down on it in full sun and 110 F. The numbers were more like 2 - 4 x this, but it did work.
       
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