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My little Kohler Substation


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  #1  
Old 01-30-2019, 03:12:32 PM
Mike Cushway Mike Cushway is offline
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What is the proper way to install a vintage analog ammeter on my little 1A21? I have matching Volt and amp meters and want to mount them on the panel holding the NOS hour meter.

The installation and the ammeter in question.
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Old 01-30-2019, 03:25:14 PM
Vanman Vanman is online now
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Default Re: My little Kohler Substation

If it doesn't require a current transformer, it would just be wired in series with either of the output lines from the set. What does it say on the back of the meter?
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Old 02-03-2019, 05:58:56 PM
Frank DeWitt Frank DeWitt is offline
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Default Re: My little Kohler Substation

My guess is that the meter needs a shunt. It should say on the meter or the box or documentation with it. If it needs a shunt then the shunt is wired in series with the generator hot wire. The meter is then connected across the shunt using smaller wire. (In parallel with the shunt.) You will need to know what shunt works with this meter.
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Old 02-03-2019, 06:18:28 PM
Vanman Vanman is online now
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Default Re: My little Kohler Substation

Interesting. I have not seen an AC ammeter that uses a shunt, though I don't see why it wouldn't be possible.

In my experience, smaller AC meters like this one are direct reading, and larger ones read full scale at 5 amperes, thus requiring the appropriate current transformer.
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Old 02-03-2019, 11:04:25 PM
Zephyr7 Zephyr7 is offline
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Default Re: My little Kohler Substation

Ive seem up to maybe 20-25 amp direct reading AC ammeters, the same for DC. I’ve only ever seen AC ammeters using current transformers (CTs) though. Every meter I’ve ever seen that uses a shunt is for DC current.

It looks like the lower left part of that meter face might have some writing. If it says something like “50mv FS”, that means 50mv will make the meter read full scale, and that would be for use with a current shunt. A meter needing a CT will say something like “5A FS” Meaning 5A to read full scale.

Bill

Last edited by Zephyr7; 02-04-2019 at 11:39:29 AM. Reason: Typo
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Old 02-04-2019, 09:06:34 AM
Mike Cushway Mike Cushway is offline
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Default Re: My little Kohler Substation

I should have the meter today and will inform as to what it says. I appreciate the help in building my little "substation". I am offgrid and will rely completely on this little 1a21 (soon to be 1a22) for my bi-weekly water pump and daily odd power usage. I fill a 65 gallon poly tank in the cabin for my daily water. I have a little over 2 hours on the unit now including a 40 minute run yesterday pumping water. Eventually, If I can ever find a decent old ram pump, I will create an overflow system that means my tank is always full from the spring below the cabin.

Fwiw, the 1A21 starts my 3/4hp lathe like a champ. I did not expect that!
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Old 02-04-2019, 01:01:43 PM
Mike Cushway Mike Cushway is offline
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Default Re: My little Kohler Substation

A shot of the back.
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Old 02-04-2019, 01:55:14 PM
Zephyr7 Zephyr7 is offline
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Default Re: My little Kohler Substation

Looks like an inspection stamp (the circle in the middle), a serial number (longer number near the top), and a date code (maybe February of 1970). No info about ratings. What other text is on the face of the meter? Usually it will say the manufacturer, something about full scale, and sometimes something about the meter movement design.

BTW, the beefy bolts for electrical connections don’t mean anything. Even 1ma meters tend to have beefy bolts.

Bill
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Old 02-04-2019, 03:53:06 PM
Mike Cushway Mike Cushway is offline
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Default Re: My little Kohler Substation

And the front.
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Old 02-04-2019, 04:04:28 PM
Zephyr7 Zephyr7 is offline
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Default Re: My little Kohler Substation

Well, they sure don’t give you much info on that little meter!

You’ll probably need to measure it. The Easiest safe way is with a transformer and small incandescent light bulb. See if you can get a 10 watt 12v Low voltage light bulb (make sure it’s not an LED replacement, you need an old school “real” light bulb).

Get a 12v AC output transformer. At least 1 amp out. You used to be able to get these at rat shack, hopefully you have one handy so you won’t have to order one.

Connect the meter in series with the light bulb and power them from the transformer. 10w at 12v Is about 0.83 amps. If the meter registers a bit under 1A then you don’t need a CT — it’s a direct reading meter. If the meter shows something else, then you can work out the ratio to figure out what CT you need to read correctly.

Bill
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