| Re: [GMCnet] Induction cooktop run off an inverter [message #325096 is a reply to message #325070] |
Wed, 18 October 2017 08:46   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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G?Rs66 wrote on Tue, 17 October 2017 21:06Hi Jerry I am an ex truck driver and have used inverters of every size to power my 110v stuff I went to 110 after going through loads of 12v things got tired of burning up coffee pots the inverter opened up a whole new world with me living on the road when my wife and me saw the advertisement for the NU WAVE induction cook top I thought this would work great so we got the deal for two of them when we got them we tried it at home and it works like a dream but when I put the other one on the truck it would not work so I got a bigger inverter still nothing I then got the other one from home and tried it still nothing so I called the company and asked them about it and was told that because of the way they are made that they will not work with inverters the nu wave is only 1300 watts and I was pushing it with 2500 and 3000 watt inverters so it must be something with the circuitry.
An apology before the start. The below has a lot of things that non-E-freindly people may not get. The problem is that I don't know other ways to describe some things. If you can form a specific question in normal English, I will do my best to answer it, but that may take so doing.
Until the depression shut us down, I earned a lot of money converting racing sloops to performance cruisers. This involved mainly three things, comfortable living spaces, workable house electrics and civilized plumbing. These are all things that are absent on race ready boats. The comfortable living spaces was largely plywood cut to shape, tabbed in and then a final assembly with screws into cleats, the civilized plumbing was always to include H&C pressure water in both the galley and the head. Adding a shower was difficult and expensive as zero discharge made things tough. The house electrics was always a big thing because owner never envisioned the complications.
The occasion of running microwaves and a few other things from an inverter was always an issue such that I began to refuse to write a quote to do it. Anything that used the juice for direct heat or to run a real motor was never any problem, but anything else was an open issue. The real unexpected gotchya was a color laser printer that the owner needed for business. That would sort of work, but it would periodically go crazy. There was no indication of why except that it was flawless on shore power. Nothing could tell me what the problem was. Then I put it on a split (that allowed me access to the individual conductors) and watched the current with a Bell probe. These are an analog device with effectively high frequency response. When watching the current with my 87, the flying spot would periodically jump. The numeric display would maybe shuffle a last digit. So, I borrowed a little digital O-scope and looked again. At first it looked good, then it looked like nothing and then it was ragged again as the digital signal aliased in and out of sync with the scope. Then (from the same tech collector), I borrowed a an old glass Tecktonics. Completely Analog. It showed me that the power consumption of the printer was all over the place when it tried to run from the inverter because the two were close to the same switching frequency. I have forgotten the actual model but the inverter was supposed to be a pure sine. Needless to say, it really was not it was just better than the modified square wave versions. The glass scope confirmed that. It looked pretty good until one expanded the wave form. It was only a close approximation to a sine with big steps at both ends where it zero switched.
Do I have an answer?
Sorry, I don't. I never saw the issue with the old Heart inverters that had an iron core transformer and a 1.5KVA was most 50# or a rotating machine that runs a synchronous speed. So I would guess that those are your choices if you want fancy electronics to work reliably.
Matt - Almost glad that he was put out of business
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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