jan50 Posted February 23, 2015 Report Share Posted February 23, 2015 Hello All, I am reaching out for help from anyone who has knowledge of keeping a roof ac going without using the generator or shore power. Any feedback would be appreciated. Question: Is it possible to add deep cycle batteries, a bigger inverter and solar panels to a class b rv so I can use the roof ac anytime I want? Can the generator recharge the batteries when they get low? Background: I want to buy a class B rv to run daily errands, to use as a mobile office, to go camping once every couple of months and to travel to Florida twice a year. I have owned class C’s in the past and I want to try a class B so I can use it on a daily basis without standing out wherever I go, and for ease of driving. It would replace my car. I want the inside to be customized to look like a little cabin. I found some inspiring pictures which I posted here: http://www.discountcatholicstore.com/rv.htm I found a licensed general contractor who is local who can do the interior custom work. (There are no rv dealers who will do it in this area.) He has told me that if I want to use the house ac on an everyday basis to run errands and use as a mobile office, I would need to install deep cycle batteries (enough to handle using the ac for 3 – 5 hours) and a bigger inverter. He can also add solar panels. Of course, the rv will have a generator but I’m not sure I would be willing to use it in the parking lot of a strip mall; especially since rv generators tend to be very noisy. Also, the contractor said something about not wanting to use the generator for hours on end. Maybe it would be easier to just get a quiet generator and just use that – rather than install deep cycle batteries, an inverter and solar panels??? Thanks! Jann Link to comment Share on other sites More sharing options...
Yarome Posted February 23, 2015 Report Share Posted February 23, 2015 Maybe it would be easier to just get a quiet generator and just use that – rather than install deep cycle batteries, an inverter and solar panels??? Thanks! Jann With a class B that would be your only practical option for A/C. I would take a look at the Honda/Yamaha inverter generators. They are as quiet as you get and extremely reliable. There is no real issue with running your generator for hours on end. It's perfectly fine to run them 24/7 if you wish. You probably don't want to be running one in a mall parking lot, but the amount of batteries and the size of inverter you would have to carry to run a roof top A/C is just not practical in a class B. Not even taking into account that you would never be able to mount enough panels to keep a battery bank of that size charged on solar alone. There are other options though.. like the mightykool 12v swamp cooler and the like. I don't have any personal experience with them though. Link to comment Share on other sites More sharing options...
greenacres Posted February 23, 2015 Report Share Posted February 23, 2015 Check out king tec solar air Link to comment Share on other sites More sharing options...
sushidog Posted February 23, 2015 Report Share Posted February 23, 2015 Here's a mini-split that will do what you ask. You will need about 8 golf cart batteries to run it all night and about 1,200-1,500 watts of solar on your roof to recharge them, but with only a 560 watt draw to produce 12,000 BTUs it is doable. The key is efficiency. This model has an EER of 21.43, plus will produce efficient off-grid electric heat in milder weather too, sparing your propane for the real cold spurts. http://www.geinnovations.net/solar-electricity-cost.html http://www.geinnovations.net/Specifications.html Here's Kingtec's 16k BTU roof mounted ac. It is not quite as efficient drawing 18 amps (at 48v DC to make 16k BTUs. The model I first listed only draws 11.5 amps to make 12,000 BTUs of cooling. Both units have variable speed rotary compressors which will scale back drawing less current when less cooling is needed, conserving power and avoiding hard, power robing starts of a conventional piston compressor AC. http://kingtecsolar.com/products/solarpoweredairconditioningunits-k25tf-4-k50tf-4/ Here's another model with a little better efficiency than the King unit, but not as much as the first unit I linked to: http://www.hotspotenergy.com/DC-air-conditioner/Specs-DC48VRF.pdf Of course a quiet generator will be your cheapest option and I doubt you will have enough room on the roof of your class B (even with side mounted or slide out double stacked solar panels) to support more than 600 watts or so of solar panels. Chip Link to comment Share on other sites More sharing options...
Rif Posted February 23, 2015 Report Share Posted February 23, 2015 As Yarome said, your only practical option is a generator. A class B has very limited roof to space for solar panels and no place to install to install the number of batteries you would need to run an air conditioner, including those suggested by previous posters. Perhaps a lithium battery setup might have the power, but they are incredibly expensive and cutting edge technology. Still, without some way of charging them it is a non-starter. I know very few folks with large Class A's or big 5th wheels who have enough room and capacity for the solar and battery needed. It's just not gonna happen in a Class B. 2000 Volvo 770, 500HP/1650FP Cummins N14 and 10 Speed Autoshift 3.58 Rear 202" WB, 2002 Teton Aspen Royal 43 Foot, Burgman 650 Scooter Link to comment Share on other sites More sharing options...
greenacres Posted February 23, 2015 Report Share Posted February 23, 2015 Kingtecusa.com has van and RV a/c units Link to comment Share on other sites More sharing options...
greenacres Posted February 23, 2015 Report Share Posted February 23, 2015 Also check out sportsmobile for your build Link to comment Share on other sites More sharing options...
Kirk W Posted February 23, 2015 Report Share Posted February 23, 2015 As Yarome said, your only practical option is a generator. A class B has very limited roof to space for solar panels and no place to install to install the number of batteries you would need to run an air conditioner, including those suggested by previous posters. Perhaps a lithium battery setup might have the power, but they are incredibly expensive and cutting edge technology. Still, without some way of charging them it is a non-starter. I know very few folks with large Class A's or big 5th wheels who have enough room and capacity for the solar and battery needed. It's just not gonna happen in a Class B. Adding just a little bit to this is the fact that you would need most of your storage space to carry batteries and portable solar panels to set up when you stop. Is it possible? Certainly it could be done but practical? Not at all. When you look to generators, keep in mind that you need one with enough power to supply the starting load as well as run current for the air conditioner. Class B roof air should be pretty small in capacity and thus need fewer amps to get going, but it is important to remember that it takes more to get it started. Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
Chris-n-Dennis Posted February 23, 2015 Report Share Posted February 23, 2015 I recommend checking with those who are doing similar living. If the guy at this link doesn't know, he'll surely know of someone who has something set up: Cheaper RV Living Personally, I don't believe you'll be able to generate enough from solar exclusively to run the van office. Its not the battery storage, its the real estate needed for solar panels. You will probably have to resort to some sort of external source to recharge. Berkshire XL 40QL Camphosting and touring Our blog: cndtravels.blogspot.com Link to comment Share on other sites More sharing options...
Barbaraok Posted February 23, 2015 Report Share Posted February 23, 2015 Are you going to be living fulltime in this Class B? At first I thought, just run the dash air when running errands, but then I had the feeling maybe I'm wrong and you are talking about living in it 24/7 off the grid? Barb Barb & Dave O'Keeffe 2002 Alpine 36 MDDS (Figment II), 2018 Ford C-Max HYBRID Blog: http://www.barbanddave.net SPK# 90761 FMCA #F337834 Link to comment Share on other sites More sharing options...
Jack Mayer Posted February 23, 2015 Report Share Posted February 23, 2015 It is possible to do. If you have enough money to throw at it, and are willing to compromise enough in other areas - such as living space. You would have to use Lithium batteries because of weight factors (in my mind at least). You would compromise your living space to put enough of them in - but not greatly. Then you have to use a super efficient AC unit as discussed above. They are out there. And you have to limit your usage off of battery - if you are talking about 3-5 hours then that is more doable than overnight. But it will depend greatly on your insulation values and the cubic feet of conditioned space. All in all it is going to cost a good bit, and you will STILL need a genset for when you need more capacity. So I would stick to just the genset. They are pretty quiet if you install the right one the right way - I would not hesitate to run one in a mall parking lot. Jack & Danielle Mayer #60376 Lifetime Member Living on the road since 2000PLEASE no PM's. Email me. jackdanmayer AT gmail 2016 DRV Houston 44' 5er (we still have it) 2022 New Horizons 43' 5er 2016 Itasca 27N 28' motorhome 2019 Volvo 860, D13 455/1850, 236" wb, I-Shift, battery-based APU No truck at the moment - we use one of our demo units 2016 smart Passion, piggyback on the truck -------------------------------------------------------------------------See our website for info on New Horizons 5th wheels, HDTs as tow vehicles, communications on the road, and use of solar powerwww.jackdanmayer.com Principal in RVH Lifestyles. RVH-Lifestyles.com Link to comment Share on other sites More sharing options...
Jfet Posted February 23, 2015 Report Share Posted February 23, 2015 Our camper has room for about 3 kW of solar (but we are starting with 1.1kW). I have considered running our small 6k BTU side mount AC off of solar and LiFePO4 but will probably just stick to climates that do not require much AC. We put in great insulation and the 6k unit does cool our living space down to 68 when the outside temp is 85, but it takes about thirty minutes to an hour. It draws 4.8 amps at 115V so uses roughly 600 watt-hr to achieve that drop. We only have around 2400 watt-hr of battery capacity so the best we could do right now is cool off the camper before going to bed and hope the night temps keep it cool. Link to comment Share on other sites More sharing options...
Shulamite Posted February 23, 2015 Report Share Posted February 23, 2015 I am pleasantly surprised at how much support came so quickly for this answer! I was asking my husby about this last week. What a nice group of folks here! Link to comment Share on other sites More sharing options...
TXiceman Posted February 23, 2015 Report Share Posted February 23, 2015 Not really practical. The battery bank and solar collectors will be EXPENSIVE and take lots of room. Best bet is a quiet generator as noted above. Ken Amateur radio operator, 2023 Cougar 22MLS, 2022 F150 Lariat 4x4 Off Road, Sport trim <br />Travel with 1 miniature schnauzer, 1 standard schnauzer and one African Gray parrot Link to comment Share on other sites More sharing options...
Guest Caseyj Posted February 23, 2015 Report Share Posted February 23, 2015 Here is another avenue of power you may want to explore. I would think that it would solve all your problems with the exception of having to pull a small trailer. Check out - http://www.bing.com/images/search?q=power+on+a+trailer&qpvt=power+on+a+trailer&qpvt=power+ Link to comment Share on other sites More sharing options...
jan50 Posted February 23, 2015 Author Report Share Posted February 23, 2015 Wow, so much help! Y'all are awesome! After reading everything and doing a little research, I am going to go with just using the built in generator. I will try to find the quietest one there is - that is installed inside the unit. I'll look into the gen set. If there are any other suggestions in this regard, please let me know. THANK YOU ALL! Link to comment Share on other sites More sharing options...
sandsys Posted February 23, 2015 Report Share Posted February 23, 2015 Generators in Class B RVs are usually installed under the rig. You don't want that burning fuel inside. My Sportsmobile conversion had 380 watts of solar on the roof which is the maximum we could fit on my long body van. I never ran the a/c unless I was on shore power since I did not have a generator but a good fan does wonders for feeling cooler. Linda Sand Blog: http://sandcastle.sandsys.org/ Former Rigs: Liesure Travel van, Winnebago View 24H, Winnebago Journey 34Y, Sportsmobile Sprinter conversion van Link to comment Share on other sites More sharing options...
Vicsze Posted February 26, 2015 Report Share Posted February 26, 2015 I am always curious about whether roof/house AC can run by the engine power while the engine is running in motorhomes. Or is it always necessary to run the generator to use it on the go? Link to comment Share on other sites More sharing options...
jan50 Posted February 26, 2015 Author Report Share Posted February 26, 2015 Vicsze, Yes, I wonder the same. And also-if the roof ac cannot be run by the engine, can you run the generator while you're driving? Link to comment Share on other sites More sharing options...
Jimalberta Posted February 26, 2015 Report Share Posted February 26, 2015 The roof AC is powered by 120 volts ac power. The engine alternator only puts out about 13 volts dc. You would need a very large alternator running that 13 volts to very large inverter....simply not practical. As to whether a gen can be run while driving....yes...lots of people do it to both power their domestic fridges and to run their roof ACs while driving. <p>....JIM and LINDA......2001 American Eagle 40 '.towing a GMC Sierra 1500 4X4 with RZR in the rear. 1999 JEEP Cherokee that we tow as well. IT IS A CONTENTED MAN WHO CAN APPRECIATE THE SCENERY ALONG A DETOUR. Link to comment Share on other sites More sharing options...
Honorman Posted February 26, 2015 Report Share Posted February 26, 2015 Wow, so much help! Y'all are awesome! After reading everything and doing a little research, I am going to go with just using the built in generator. I will try to find the quietest one there is - that is installed inside the unit. I'll look into the gen set. If there are any other suggestions in this regard, please let me know. THANK YOU ALL! Jann, Please do not run your generator inside your Class B !! it has to be installed outside away from you as it will kill you from the fumes , it will also need outside air to cool it, if you must have it in the rv, it will need a new cut out compartment on the outside completely insulated from the inside and with a fan or someway to keep it from overheating, I hope you come back and read this. Ed Link to comment Share on other sites More sharing options...
Kirk W Posted February 26, 2015 Report Share Posted February 26, 2015 I am always curious about whether roof/house AC can run by the engine power while the engine is running in motorhomes. Or is it always necessary to run the generator to use it on the go? The simple answer is that it can only be operated from shore power or an on-board generator. Even if you had an inverter that was large enough to supply it power, which I've never seen in an RV, you would need a far bigger alternator added to the main engine to supply it the needed power. While it is actually possible to make that work, it is completely impractical. Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
jan50 Posted February 26, 2015 Author Report Share Posted February 26, 2015 Thank you! Link to comment Share on other sites More sharing options...
jan50 Posted February 26, 2015 Author Report Share Posted February 26, 2015 Jann, Please do not run your generator inside your Class B !! it has to be installed outside away from you as it will kill you from the fumes , it will also need outside air to cool it, if you must have it in the rv, it will need a new cut out compartment on the outside completely insulated from the inside and with a fan or someway to keep it from overheating, I hope you come back and read this. Ed I was referring to a generator that is already built into the class b rv from the factory. I was not referring to a portable generator. Thank you for pointing this out though... I appreciate it... Link to comment Share on other sites More sharing options...
skp51443 Posted February 26, 2015 Report Share Posted February 26, 2015 Someone mentioned an all-electric class b a few days ago, it had a super duty engine alternator and I think. http://www.roadtrek.com/models/e-trek/ First rule of computer consulting: Sell a customer a Linux computer and you'll eat for a day. Sell a customer a Windows computer and you'll eat for a lifetime. Link to comment Share on other sites More sharing options...
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