Math test - Induction Cooktop - Fiberglass RV


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Old 08-24-2019, 12:39 PM   #1
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Math test - Induction Cooktop

Hi All,

Following the thread about using Instant Pot brought up a question on my potential set-up. What are the implications of using a 1300 watt Induction Cooktop over a 1800 watt Induction Cooktop in regards to power usage. Is using the 1800 watt induction cooktop on - let's say - medium, the same as using the 1300 watt cooktop on max setting.

On the grid the 1800 watt induction top has greater versatility. Off grid will 1800 watt be too much of a drain. Is is better to get a 1300 watt induction cooktop? I plan to bring foods to boil with induction (10-15 min) - finish cooking in Wonderbag. So high power drain - shorter time period.

Sandy
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Old 08-24-2019, 01:28 PM   #2
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To complicate the math, remember that water boils at a lower temperature at higher elevations, and food will take longer to cook. Pasta that cooks in 15 minutes at sea level might take 30 minutes or more at high altitude. Pressure cookers are great!

In general, boiling is an inefficient way to cook. Think sauteeing and stir frying.
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Old 08-24-2019, 01:52 PM   #3
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Most of us take for granted the almost unlimited supply of electricity we have at home. The average homeowner uses over 900 kilowatt hours per month. That means using the equivalent of 1,000 watts for 900 hours, or however you choose to divide it up.

The 1800 watt cooktop on high would use 1 kwh in about 33 minutes. The 1300 watt version would make it almost a full hour. A size 27, 12 volt battery can supply 1,000 watts for about half an hour before it should be recharged. That's 20 hours of sunlight with a 100 watt solar panel, figuring normal inefficiencies. Making heat from batteries is not yet very practical.
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Old 08-24-2019, 02:05 PM   #4
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Originally Posted by Jon in AZ View Post
To complicate the math, remember that water boils at a lower temperature at higher elevations, and food will take longer to cook. Pasta that cooks in 15 minutes at sea level might take 30 minutes or more at high altitude. Pressure cookers are great!

In general, boiling is an inefficient way to cook. Think sauteeing and stir frying.
Thanks Jon - good advice - we'll be staying at sea level mostly. I liked the idea of induction plate as potentially more versatile than instant pot - for the reason that sauteeing or stir frying are also possible.

I got the pots for induction already - just need to decide 1800 watt vs 1300 watt burner in terms of load. Should I sacrifice 500 watts for the sake of energy sustainability? If I think of it like backpacking - every ounce (or watt in this case) matters. Is this a good way to approach it?

Our all-electric EggCamper has none of the installed appliances (some have microwave and coffeepot) - just an outlet. An induction burner will be my one indoor cooking option for rainy day.

Thanks!
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Old 08-24-2019, 02:20 PM   #5
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Most of us take for granted the almost unlimited supply of electricity we have at home. The average homeowner uses over 900 killowatt hours per month. That means using the equivalent of 1,000 watts for 900 hours, or however you choose to divide it up.

The 1800 watt cooktop on high would use 1 kwh in about 33 minutes. The 1300 watt version would make it almost a full hour. A size 27, 12 volt battery can supply 1,000 watts for about half an hour before it should be recharged. That's 20 hours of sunlight with a 100 watt solar panel, figuring normal inefficiencies. Making heat from batteries is not yet very practical.
Thanks Lynn,

This is a good explanation of the impact of choosing 1800 watt induction vs. 1300 watt on power useage. Thinking I'll choose 1300, and induction plate will only get packed when we will be plugged in. Even then - as soon as the pot hits temperature it will go into thermal cooker.

I am reading posts about solar - ideal for Florida. After we get some experience with TT - and the funds - we will look into that.
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Old 08-25-2019, 02:15 PM   #6
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I think Lynn said it best, batteries are less than ideal for cooking. I must say that I enjoyed reading the instant pot thread. My take away is there is nothing like cooking with gas, except maybe charcoal or even an open fire.
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Old 08-25-2019, 10:35 PM   #7
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the highest browning temperature setting on an Instapot is 380 degrees

The medium high temperature on an induction cooktop is 300 degrees

You will be just fine using an Instapot for many tasks including browning meat for stir frys and/or for veggie stir fry. Not as high as a steel Wok on a restaurant range that has tons of BTUs but it will still get the job done.


Remember if you find it does not work the way you hope for your frying needs then you can always purchase an induction cooktop at a later date.
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Old 08-25-2019, 10:48 PM   #8
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I'd just heat a can of Campbell's Chunky Steak and Potato soup on a propane or butane burner.

If that's not appealing, there are thousands of recipes for BBQ or fry pan meals.
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Old 08-26-2019, 02:39 AM   #9
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I have hefted up those Instapots at the stores and even the little one is a major chunk of weight, about 10 times the weight of my stainless steel stove top pressure cooker. I will do without the convenience of the built in timer while knowing that the Instapot takes just as much time to pressure cook something as a stove top unit.


My payback is that I can travel in a 4 cylinder vehicle and have the gas savings of that. But I can't do that if I add appliances that don't return their value in function plus weight savings.
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Old 08-26-2019, 03:13 PM   #10
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Like Kai - my TV is a four cylinder - best to keep TT weight down. Seems like the best answer is to fill my home kitchen with all the small appliances - and take along whichever one seems best per trip. Ok course Kai's post brings up the thought of combining the induction burner and a stainless steel pressure cooker So many permutations - this really is a Math Test.
My name is not Kai, it is Karin. We are not the same person, she is very nice and much more outgoing and has even hosted a gathering in Seattle. She has an Amerigo and I have a Campster but both of us are in the Seattle area. Perhaps one of these days we will even get to meet each other
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Old 08-26-2019, 03:34 PM   #11
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1300 watts from an inverter driven by 12VDC batteriues is about 120 amps, allowing for conversion efficiency.

if you have a single group 27M (typical in a Casita), you have *max* 100 amp*hours in your battery. if you have dual 6V golf cart batteries, you might have 230 amp*hours. BUTT, and this is a biggun, lead acid batteries do not like to be taken below about 50% discharge, or you greatly shorten their life span, even the proper deep discharge ones.

it will take a 100W solar system, that actually has a useful output of 5-7 amps, at least 20 hours of direct sunshine to put back in 120 amp*hours. a 200W solar system might do it in 10 hours.

leave the high wattage electric appliances at home, you're CAMPING. cook with gas.
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Old 08-26-2019, 03:36 PM   #12
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There are always options. You are not really limited to electricity in an all-electric camper. I sometimes use one of these:
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
It's light weight, not too big, comes in a plastic carry case, and is very easy to pull out and put away.
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Old 08-26-2019, 05:25 PM   #13
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My name is not Kai, it is Karin. We are not the same person, she is very nice and much more outgoing and has even hosted a gathering in Seattle. She has an Amerigo and I have a Campster but both of us are in the Seattle area. Perhaps one of these days we will even get to meet each other
Oh shoot - thanks Karin for the clarification. My apologies.
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Old 08-26-2019, 06:15 PM   #14
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leave the high wattage electric appliances at home, you're CAMPING. cook with gas.
Thanks John, Tony, Glenn and Mike for sharing your thoughts. After a long hot summer - camping is on the horizon Just a hurricane or two to get through first. Maybe I'll get to practice off the grid skills. It is reassuring to have gas stove just in case power is lost.
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