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Old 01-17-2019, 07:05 AM   #15
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Dave-n-Janet's Avatar
2017 26' Flying Cloud
Moss Point , Mississippi
Join Date: Jun 2017
Posts: 69
microwave on inverter

Some real world experience:
On my 2017 26U after I upgraded batteries to 2x6v GC I was able to run installed microwave off the inverter. Never tried it before battery change out. Drew about 80 amps. Just long enough to heat 2 pizza slices at a rest area. Note, didn't have a grounded extension cord so pulled microwave from drawer to run on inverter outlet in dinette area, 400 watt solar on roof may have been contributing, don't know if this would have succeeded in full dark.

Another data point is I ran my 1000 watt coffee maker (10 cup cuisinart) three times successfully but have decided to go back to percolator as it was drawing up to 100 amps and not sure that is good for the long life of the 1000 watt inverter. Took 12-15 minutes to complete coffee prep and as I recall took batteries down about 15%. Was somewhat worse when I ran the coffee maker a second morning as batteries were at 80% to start.

Figured the inverter would shut off if drawing too much power which didn't happen. Not sure if these big current draws impacted battery life, but haven't seen any signs of that.


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Old 01-17-2019, 07:52 AM   #16
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1968 26' Overlander
Join Date: Apr 2018
Posts: 45

Are you not using a generator when boondocking? The inverters suck battery life like there is no tomorrow!......These new Yamaha generators are so quiet, you could literally have it running right beside you and have a conversation without even raising your voice....?

1968 Overlander Land Yacht International
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Old 01-17-2019, 09:01 AM   #17
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2017 26' Flying Cloud
Moss Point , Mississippi
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I do have a Champion dual fuel 3500 watt, but run that for A/C or if very cloudy rainy days in succession...
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Old 01-17-2019, 09:19 AM   #18
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2015 30' Classic
2012 28' International
Greensboro , North Carolina
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I have almost the same setup as DaveP. 30 Amp Magnum along with 4 of the Lifeline 6V batteries. Add in 600W of solar and you’re hovering in the $6,000 range. (Once the batteries go, I’ll move to Lithium.)

Obviously, I didn’t do all this upgrading just for being able to use the Keurig when we’re not hooked up or using a generator.

Long ago in a previous trailer I did the 2000W inverter trick. As others have noted, a high amp draw quickly depletes the two Lifelines very quickly.

With the Easy Starts in my A/C’s I run one unit when we stop for lunch at a rest stop. If it’s a bright, sunny day, the panels do a pretty good job replenishing the batteries from noon until sunset. We routinely run the dishwasher off the batteries if we’re boondocking. Uses less water.

I am really curious how long you can go without being plugged into a power pedestal in the newer Classics that are loaded with electric power consumers with two AGM Lifelines.

It’s all in how you use your Airstream. I just want to know I CAN be off the grid and still be comfortable.
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2014 RAM 2500 Laramie 4x4 CC w/6.7L Cummins
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Old 01-17-2019, 10:43 AM   #19
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1966 24' Tradewind
1995 34' Excella
Lynchburg , Virginia
Join Date: Sep 2009
Posts: 3,064
Some more real world experience:

A couple of years ago I had two golf cart batteries and a 1,000 watt inverter (photo 1). This would run all my 120v stuff except for the microwave and it all worked quite well.

I recently decided to replace my 8 year old golf cart batteries with 2 BB lithium batteries and install a Samlex 2,000 watt inverter so that I would be able to operate a microwave (photo 2). I performed a test by running the microwave for 2 minutes to heat up a cup of water. The microwave required 977 watts and the battery power required was 1,120 watts (photo 3). The battery voltage while operating the microwave was 12.1v (photo 4) so the current out of the battery was 92.6 amps. Operating the microwave for 2 minutes reduced the Battery SOC from 72% to 71% (photo 5). I believe the test was quite successful and am very happy with the performance of the BB batteries and the Samlex inverter.

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