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Old 04-24-2019, 07:05 AM   #1
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Inverter killing my coffee maker?

I've gone through 2 ($70) Black and Decker coffee makers in less than 6 months. Is my inverter killing my coffee maker? I seem to remember reading somewhere that may be the case. I've now bought a simple Mr Coffee maker without the timer or digital clock etc. Thanks. Max.

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Old 04-24-2019, 07:20 AM   #2
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May not be the inverter but the RV park power. Many parks have really inconsistent voltage and fluctuating voltage is hard on electronics. Getting a simple coffee maker is likely a wise move. We travel a lot probably 200+ parks/locations in the last 4 years, US and Canada, and have seen some really horrible power on both sides of the border. My GF got me a Bonavita coffee maker. Simple turn it on, brews and no timers. It's 3+ YO and going strong. Nice thing about it is the brewing function works when it has water in it. Once the water is brewed through it, it cuts back the amperage, 10, to about 2 for the heating pad. Quick too.

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Old 04-24-2019, 07:32 AM   #3
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If it is a modified sine wave inverter it probably is the problem. That's why pure sine wave inverter are preferred. They cost a little more but will not kill your expensive electronics. At least all you have lost is a coffee maker.
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Old 04-24-2019, 07:39 AM   #4
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Electric equipment with digital controls generally have problems with modified sine wave power.
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Old 04-24-2019, 08:01 AM   #5
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Expect the 07 Scepter would have a inline protector for low/high and other dastardly bad electric situations coming in from the pole!

Dreamer - I'm assuming your question about the inverter is because you know you made some pots of coffee while not using Shore or Generator Power(?).

I'd take a look at your current inverter to confirm what model you have, then research to see if it is Modified or PSW. If it's Pure Sine Wave, the you should inspect you electric system from Shore Power up to the outlet in question, and confirm all well. I've heard reports of failing GF Outlets in a line, causing problems.

When researching your specific coaches inverter, confirm it has pass thru for shore power.

We also lost two coffee pots, then went to a single coffee pot from Simple Human, which did OK on the Modified Sine Wave unit we had in our coach at that time. After we adde panels and swapped out the Inverter to a Magnum MS2812 PSW, we also returned to a nice coffee pot.


The above unit has no digital, but I do believe it is happier with PSW. I've talked another coffee geek with a Fiver, who has had the above pot for over 6 years, and brews off of Modified Sine Wave with it about 4-5 times a year.

So if you were losing the pots from running off the inverter, either get a PSW unit - and or get a simpler non digital coffee pot. (But since other Digital items may also be running in your RV, PSW would certainly not hurt them either!

If shopping for a PSW inverter today, I'd probably have gone with the Magnum MSH series, as I like the idea of being able to supplement say a 20 or 30A power supply, with House Battery. Or, if being charged in a park for used power, being able to use the House Batteries for a large percentage of that during the daytime, while our Solar is replenishing our bank. MSH's just provide more flexibility. (And as luck would have it, they came out about 1/2 year after I went with the MS2812!).

Best to you, and enjoy your coffee,
Roo II is our 04 Country Coach Allure 40'
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Old 04-24-2019, 08:06 AM   #6
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Originally Posted by dreamer View Post
I've gone through 2 ($70) Black and Decker coffee makers in less than 6 months. Is my inverter killing my coffee maker? I seem to remember reading somewhere that may be the case. I've now bought a simple Mr Coffee maker without the timer or digital clock etc. Thanks. Max.
Solution - https://www.walmart.com/ip/Mainstays...SABEgJ81_D_BwE

Under $10 works - fits in the KISS system. I've had the same one for over 20 years

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Old 04-24-2019, 08:48 AM   #7
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B&W coffee makers with a clock or timer won't survive on a modified sine inverter. Most Mr Coffee models will - smarter electronics inside.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
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Old 04-24-2019, 09:08 AM   #8
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I mounted a 3000 watt pure sine wave inverter inside the basement compartment by the steps. Then ran an extension cord through the rig. It powers the tv/DVD and my espresso machine when boondocking. No need to run the genny to watch TV or make espresso. It was fairly inexpensive too.
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Old 04-24-2019, 09:50 AM   #9
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Despite what has been written above after almost 5 years of Full Timing from Maryland west and to Alaska several times I have never had any issues with Park Power. Nor have I ever had any Electronic device including my laptops and digital Flat Screen TV, microwave etc have any problems.

In fact the key board on most microwaves are the same type of circuit as on your coffee maker and if your microwave is still working it probably is something else.

On the rare occasions that I suspect a problem with an outlet anywhere I use my inexpensive plug in tester which will give you a clear message (in lights) of whether it is wired correctly or has a fualt. You do not need fancy expensive RV specialty testers for this.

Second if you are experiencing this problem ONLY on your coffee maker I would tend to suspect the wiring of that individual outlet and THAT is where I would start.

When I diagnose a problem I start with the SIMPLEST possible event first and work out from there. Too many posts here have jumped very quickly to a big umbrella type of problem/solution.

As for coffee makers that are ideal for RV's and make the BEST coffee...try a French Press...all you have to do is boil water...no filters, no electricity, no coffee machine to clean and break and take up counter space. And it makes superb coffee.
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Old 04-24-2019, 06:11 PM   #10
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I installed 2 of the space saver B&D coffee makers in my coach. I wanted something that would free up some counter space and be secure while driving. Both of them lasted a short period of time and I gave up. Use the cheapest/simplest coffee maker I could find and it's lasted years.
Jim J
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Old 04-25-2019, 08:57 PM   #11
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A pure sine wave inverter has a very clean sign wave think of it as a circle while a MSW looks like an almost flat tire only it would be partially flat on top and bottom.
This would make for a very uncomfortable ride.

Another way to see the problem read the output of a MSW inverter with a cheap digital meter and it will show 80 to 95 VAC. An expensive digital meter with RMS correction will read around 120VAC.

Same thing with your electronic equipment some devices just can't handle the chopped off sine wave (MSW) and eventually self destruct.
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Old 04-25-2019, 09:46 PM   #12
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Our Keurig coffee maker has been on board for six years now. Usually on park power, but sometimes on the MSW inverter. No problems. We also have a $15 5 cup unit that has also worked just fine.

Tom & Jan ---- Westwing43 (RVM28)
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Old 04-25-2019, 09:51 PM   #13
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Modified Sine wave Inverters are known to have issues with computers, but I would not think they would bother coffee makers?
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Old 04-25-2019, 09:54 PM   #14
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Stove top percolator.... when dry/no hook ups.....works every time and no need to run down your batteries or disturbing the neighbors at 5am.with running the generator.

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