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Old 05-10-2019, 04:06 PM   #1
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Clock doesn't keep time when powered by inverter

A recently purchased alarm clock loses its mind when powered off the inverter. The inverter is the original equipment on my 2011 Ventana, and it is a modified sine wave inverter. Does anyone know if there is a way to tell if a clock is suitable for running off this inverter (short of buying one, trying it, and taking it back when it doesn't work)?
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Old 05-10-2019, 04:18 PM   #2
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Quote:
Originally Posted by jswickard View Post
A recently purchased alarm clock loses its mind when powered off the inverter. The inverter is the original equipment on my 2011 Ventana, and it is a modified sine wave inverter. Does anyone know if there is a way to tell if a clock is suitable for running off this inverter (short of buying one, trying it, and taking it back when it doesn't work)?
All 120 volt A/C clocks use a shaded pole motor which requires a true sine wave to correctly keep the correct time. I suggest you use a battery powered clock. I like a talking alarm clock. The two AA batteries last for about 20 months.
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Old 05-10-2019, 04:19 PM   #3
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Old 05-10-2019, 04:21 PM   #4
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You pretty much have answered your own question. There is no way to tell since devices may work ok on one msw inverter and not on another.
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Old 05-10-2019, 04:24 PM   #5
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Originally Posted by jswickard View Post
A recently purchased alarm clock loses its mind when powered off the inverter. The inverter is the original equipment on my 2011 Ventana, and it is a modified sine wave inverter. Does anyone know if there is a way to tell if a clock is suitable for running off this inverter (short of buying one, trying it, and taking it back when it doesn't work)?
Does it work on generator or shore power? Is it in the BR? I only have 2 out of 4 outlets in the BR that are powered by the batteries through the inverter.
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Old 05-10-2019, 05:21 PM   #6
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Battery-operated clock is the way to go. They come in all sizes, types and styles. Inverters cannot product a pure sine wave (well, affordable ones, anyway) that clocks need to keep accurate time.

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Old 05-10-2019, 05:29 PM   #7
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Inverters cannot product a pure sine wave (well, affordable ones, anyway) that clocks need to keep accurate time.
That strikes me as an odd statement coming from someone who, no doubt, has a pure sine wave inverter in his MH. The price difference between an MSW and a PSW inverter is ~$500-750 depending on brand and size. It's hard to understand why most people wouldn't pay that difference to ensure that all their electronics function properly.
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Old 05-10-2019, 05:35 PM   #8
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I have a Timex T308S digital clock radio that's operated over a year on our MSW Magnum inverter when dry camping (a lot) with nary a hiccup.
Now, a fan we had with digital controls got all hot under the collar on MSW power.
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Old 05-10-2019, 08:49 PM   #9
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Here is a little bit of background I learned years ago when working with time sync and tape recorders for the FAA. This is prior to when the internet or GPS time syncing became standard.

Most every run of the mill plug-in clock (with and without battery back up) uses the power's cycle to keep time. Power companies are required to maintain a very strict adherence to 60 hz thus even the cheapest plug in clock can keep excellent time.

However...when our tower would go on back up generators the clocks in the tape recorders would drift and sometimes significantly. That is because the standby generators don't keep such a precise 60 hz even after they are warmed up. That doesn't even include initial start up variances.

Home clocks with battery backup also drift when forced to use the battery. Some more than others.

So, it can be rather normal for plug-in clocks to drift in time when the RV is on generator or a PSW inverter for it to drift depending on how close they stick to 60 hz.

Unfortunately there is no way to even begin to guess how some clocks will react to a MSW inverter.

BTW...Just for reference

Cummins info on frequency regulation on newer diesel models:
Frequency regulation no load to full load: 0.1%
Random frequency variation for constant loads: 0.6%.

For the Magnum Energy 2812: inverter Output frequency and accuracy 60 Hz 0.1 Hz
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Old 05-10-2019, 09:03 PM   #10
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Quote:
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That strikes me as an odd statement coming from someone who, no doubt, has a pure sine wave inverter in his MH. The price difference between an MSW and a PSW inverter is ~$500-750 depending on brand and size. It's hard to understand why most people wouldn't pay that difference to ensure that all their electronics function properly.
I should have added "at a regulated 60 cycles" to my comment.

TJ
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Old 05-10-2019, 09:34 PM   #11
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When we travel, one of our bedside clocks runs off our PSW inverter and the other runs on its backup battery because its outlet isn't on the inverter. Quite honestly I've never noticed a reproducible difference between the two after our normal 6-7 hour travel day.
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Old 05-10-2019, 11:23 PM   #12
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GF has a plug in Sony Clock near bedside table. It is supposed to update it's time automatically, and I guess it does, because she never says it is wrong. I have a watch and cell phone, and when we are up, the tv is going, and I can get the time from there. I just have never noticed the time being off on any of the appliances. The Microwave loses a minute over about a month time, but that is about it.
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Old 05-11-2019, 06:15 AM   #13
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Quote:
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When we travel, one of our bedside clocks runs off our PSW inverter and the other runs on its backup battery because its outlet isn't on the inverter. Quite honestly I've never noticed a reproducible difference between the two after our normal 6-7 hour travel day.
Luck of the draw, maybe clocks with batteries have gotten better? I know that I have had 2 clocks in the past that drifted at different rates on batteries...but they drifted. One GAINED about 2 minutes an hour when on battery. At least it didn't make me late for work. LOL
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Old 05-11-2019, 06:31 AM   #14
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Got a Magnavox radio/alarm clock. Works perfectly on shore or inverter power. Inverter is pure sine wave. No batteries.
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