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Old 19-01-2015, 17:00   #1
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Load Shedding

I am looking for a commercial device that will sense the 120 volt current drawn through the electrical panel and shut down the electric water heater to avoid tripping the master when the AC and microwave or coffee maker are running. Once the load is low, the water heater would resume operation.

Any such device on the market?
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Old 19-01-2015, 17:14   #2
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Re: Load Shedding

This might get you started looking in the right direction:
Dandy Load Miser Energy Divider Controller | AC Dandy

Attach the water heater as the non-essential load.

James
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Old 19-01-2015, 17:38   #3
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Re: Load Shedding

I found this.....although the specs leave a bit to be desired.

http://www.galco.com/buy/ABB/LSS1/2


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Old 19-01-2015, 18:28   #4
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Re: Load Shedding

Do a search under "Load Shedding" or "Power Management".
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Old 19-01-2015, 18:38   #5
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Re: Load Shedding

Quote:
Originally Posted by DeepFrz View Post
Do a search under "Load Shedding" or "Power Management".
I can do that but if someone already uses such a device, their information would be a big help.

A search brought up the:

Panbo: The Marine Electronics Hub: Paneltronics AC load shedding, smarter power

but for $689 I could just upgrade the boat to 50 amps.

The problem I anticipate is, I'm thinking of installing an air conditioner with resistance heat instead of reverse cycle heat. It's not as efficient tin the heating mode but wear is greatly reduced. The extra current draw of the heating element may cause an overload when the water heater comes on.

If I can't find a reasonably priced off the shelf solution I can just add a relay to the heating circuit that disables the water heater.
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Old 19-01-2015, 18:48   #6
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Re: Load Shedding

Xantrex has a unit. May be more than you need as well though. Freedom Sequence.
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Old 20-01-2015, 07:27   #7
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Re: Load Shedding

Quote:
Originally Posted by DeepFrz View Post
Xantrex has a unit. May be more than you need as well though. Freedom Sequence.
They may all be more than I need. I can get by with something that just disconnects circuit "A" when circuit "B" comes on. Disconnects the water heater when the resistance heat element comes on. I don't need to monitor current or have a sophisticated list of priority circuits and time delays.

Most of my career was in electric and electronics and at one time I had the tools and access to parts to easily construct such a device. I've been out of it for twenty years and my tools and parts are gone so it's more difficult now.

All I need is to connect a small transformer to the same leads as the heating element, run the low voltage from the secondary of the transformer to a relay near the water heater and connect it so that when the relay is energized the water heater circuit is opened. The difficulty is finding the parts and mounting them to be ABYC compliant (safe). All the 120 volt stuff has to be enclosed.
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Old 20-01-2015, 08:00   #8
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Re: Load Shedding

What about a current sense relay? Available from the electronics supply houses for <$100. It could sense the AC heater current and shut down the water heater. Mount it in a housing with the appropriate fuses, no need to build a board level circuit.

http://www.crmagnetics.com/Products/...DFs/4395_a.pdf
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Old 20-01-2015, 08:59   #9
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Re: Load Shedding

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What about a current sense relay? Available from the electronics supply houses for <$100. It could sense the AC heater current and shut down the water heater. Mount it in a housing with the appropriate fuses, no need to build a board level circuit.

http://www.crmagnetics.com/Products/...DFs/4395_a.pdf
Yep, that's another way to do it. I'll take a look. Thanks.
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