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andy-n avatar image
andy-n asked

Smart phoenix Inverter 12/2000 230v frequency issues

Above inverter is installed in a vehicle, all professionally installed, I have an LG 1000W inverter Microwave installed.

Question: The time (clock) on microwave has increased 45 minutes in about 2 weeks.

Inverter is on factory defaults ie 50Hz as per Australian standard.

Help would be appreciated. More a nuisance issue than operational issue.

cascading inverters
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2 Answers
klim8skeptic avatar image
klim8skeptic answered ·

Apparently odd harmonics from inverters will cause accuracy drift in clocks that derive their timekeeping via mains frequency.

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southsideph answered ·

All clocks that use the alternating frequency reference can drift. On grid the generating company adjust the frequency during the day to compensate/correct any drift. Unfortunately using an inverter you do not get this compensation/correction so you will always get some drift

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andy-n avatar image andy-n commented ·
But 45 minutes in 2 weeks, that's a very big time advance. Thanks for yours and other answer.
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klim8skeptic avatar image klim8skeptic ♦ andy-n commented ·
Maybe run the ac through a power filter board.?

Might work, might not.

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southsideph avatar image southsideph andy-n commented ·
Unfortunately phase frequency can be affected by many different factors, including load, capacitance, inductance, resistance, cables, tolerance of the components used etc.


Although the stated frequency is 50Hz could be +- 0.1% for example. It is still only the centre point between the two tolerances, which could be 49.5Hz and 50.5Hz, which would either cause a clock (50Hz Referenced) to either loose time or gain time.


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