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Old 10-02-2005, 10:52 AM   #1
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Inverter sizing for factory convection/microwave oven?

We have a 25 FB on order. This model has a combination convection/microwave oven. We would like to run the microwave for say 20 minutes a day total while boondocking, so we need an appropriately sized inverter to do the trick.

We didn't purchase the 600 watt inverter offered by Airstream, because than seemed far too puny for this job. Does anyone have a recommendation for an inverter that can handle this factory option?
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Old 10-02-2005, 11:12 AM   #2
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Question

Hi Mike -- Your purpose is to run the convection microwave off the batteries? I do not presume to know the particulars for your answer, but I am wondering if that application of power would drain the batteries severely. How are you going to recharge? Why not just get a small generator?

Are you getting the SE? We had a driveway party with a couple of friends last night. I just love how the rear living space is parked away from campsite roads -- puts us right back in the privacy of our own 'back yard'! (Don't worry -- my garage isn't my idea of a great campsite view.)
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Old 10-02-2005, 12:09 PM   #3
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Quote:
Originally Posted by myoung
We have a 25 FB on order. This model has a combination convection/microwave oven. We would like to run the microwave for say 20 minutes a day total while boon docking, so we need an appropriately sized inverter to do the trick.
The 600W inverter will not run the microwave, 600W it would be good for say a TV or Computer maybe a coffee pot. A microwave rated for 800W cooking power takes about 1200W of input power, a 1100W cooking power microwave takes about 1650W of input power
The issue of running a microwave oven is not so much the inverter a 2000W inverter should be enough. The real issue is the Battery/Batteries.
without the exact rating of the appliance you are trying to run you can't really figure out how long you can run on batteries, here is an example.
Say you have a 1650W draw on the inverter and a 90% efficiency rating on the inverter, your battery current would be 151.25 amps.
151.25amps x 12Vdc = 1815 watts/90%= 1650W The math checks both ways. A 100 amp hour battery will supply 10 amps for 10 hours. It will not supply 151 amps for more than a few minutes before it will drop below 12Vdc. If you were to go to 2 100Ahr batteries you would still not get much run time. I would guesstimate that you would need 500 to 600Ahr's worth of battery before batteries alone would become usable. Then you would have to recharge them, that is another story. The weight would be about 400lbs or so.
The battery on your trailer was only meant to run the lights and water pump while boon docking and running a microwave off the battery is just not practical.
The short part of a long story, get a generator if you want to use your microwave while boon docking.
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Old 10-02-2005, 02:35 PM   #4
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Lightbulb

Mike -- I forgot to give a warm-fuzzy about your early status at the best research site for Airstreams. Welcome!

Anything you don't have to route thru AC will save 12V power. Some idea places are www.westmarine.com or www.swego.com. overlander64 has spoken highly of his 'Breeze' fan (http://www.fantasticvent.com/). RV catalogs/websites are another place to look.

Anybody else have a favorite 12V accessory or source?
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Old 10-02-2005, 05:32 PM   #5
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Reply to Canoe Stream:

We ordered the 2006 Safari 25 FB LS, without the SE option. So, we don't have the panoramic windows in the rear or the chance for an optional one in the front. I imagine someday soon A/S will make one or both of those windows optional on the plain Safari 25 FB.

My wife and I like the softer liner. One thing that seems odd in the pictures that we have found on the Web, which is our only source of info on the FB because we couldn't find one at a dealer out here, is the little bit of carpeting in the bedroom. Actually, the pictures make it look like only half the floor between the bedroom entrance and the nightstand is carpeted while the other half looks like the vinyl flooring like that found in the kitchen area. Is this true? I wonder if we should quickly call the dealer/factory and get a complete vinyl floor rather than what appears to be a postage stamp piece of carpet remnant.

Regarding power, we are having the solar panels added by the factory. I don't know what the amp-hour rating of the two batteries is. Do you? Than we can work backward to decide whether to add a 1000w or 1500w inverter for microwave use. We like to use a microwave for reheating or quickly cooking vegetables. Of course, we would never consider using the inverter for something that both draws considerable power and might be used for more than a few minutes, stuff like the A/C and the convection oven.

Sure wish the RV industry would adopt the movement towards 24v, which is catching on in the marine industry. These 12v systems are so 20th Century.

Cheers.
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Old 10-02-2005, 05:37 PM   #6
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Gary,

Thanks for your extensive reply and analysis. I think that I should get a better idea about the capacity of the 2 stock 12v batteries and go from there. The choice between inverter of say 1000w or 1500w versus a little gas generator like the Hondas will become clear after a few more facts.

I'm doing all this research blind in that we ordered our Airstream this week and have very little in the way of definitive specifications from either the brochures (out of date and incomplete) or the Web site (perhaps more up to date but certainly not as complete as we would like).

Cheers.
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Old 10-02-2005, 05:38 PM   #7
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By the way, to anyone reading this post, can you please tell me why my profile box contains the notations: "Warn: (0%)" followed by 5 little yellow boxes?

I'm curious. Thanks.
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Old 10-02-2005, 06:14 PM   #8
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There is an extensive discussion about the warn meter here. It is a new addition to the forums software and not currently in use.

Relax - go back to figuring out how to spend sack loads of cash on your new AS... You're going to have a great time with that new trailer.
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Old 10-02-2005, 09:29 PM   #9
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We replaced the two stock batteries with one 12 volt 305 amp sealed gel cell batttery weighing in at 165 pounds with wire and fuses another 4 pounds and a prosine 3000 watt inverter at 36 pounds. Everything works well with no problems and ave never been with 120 volt power when we needed it. Still you must watch the batttery voltage when running the microwave for long periods.
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Old 10-02-2005, 09:57 PM   #10
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150 amps short circuiting on the side of the trailer should be able to blow a 10' hole in the aluminium side without any problem. To raise a point on battery safety if you had a short across the 2 batteries without fuse protection the instantainious current would be in excess of 2000 amps at which point the batteries would explode from the rapid expantion of gasses caused by heat.

be carfull

good luck
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Old 10-02-2005, 10:15 PM   #11
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Mike -- In the 2006 Quality thread I allude to our special order of linoleum-only throughout the trailer front. We did get the twin beds and appreciate being able to negotiate the trailer front without climbing on a queen... We've been looking at 25' Safaris for 6-8 years, never liking the tightness of the queen beds in them -- I just refuse to believe a longer trailer will work for where I want to camp (boondocking & fishing!).

I do like the linoleum in the forward area, but there does seem to be a slight increase in the subfloor thickness at the junction of the bathroom/front bedroom area. The linoleum does seem unsupported for a couple inches there! I already am thinking up a fix if it seems to be approaching failure at all.

I've sent a PM on other issues that I'll not air in public.
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Old 10-03-2005, 08:24 PM   #12
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Don't need to reinvent the wheel, y'know...

This was easier than I thought, principally searching on keywords: solar prewire. There's a lot of capacity information folded, spindled & masticated into these threads for starters -- make sense of it as you will.

Boon Docker Solar Package?
http://www.airforums.com/forum...ead.php?t=7066

Can't get batteries charged -- why not?
http://www.airforums.com/forum...ad.php?t=14452

Solar trickle charger....
http://www.airforums.com/forum...ead.php?t=6143
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