Water heater wiring for generator hookup and to 120 VAC power?

I mean:How is it necessary to exhaust the poisonous exhaust gases? In a shop where they work on autos.

Heat may be bad at times, but it's not poisonous. The topic was CO poisoning.

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Reply to
mm
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Reply to
w_tom

Hey, tell us more. I've always thought stairs were a waste of money and floorspace, compared to a DC winch or a trapeze or a bosun's chair with a counterweight.

Nick

Reply to
nicksanspam

Nonono. Never use a generator outdoors. That wastes about 80% of the fuel's heating value. You might run the exhaust from a $900 1500 W Honda generator with a $2K grid-tie inverter into the top of a $200 gas water heater that preheats water for the usual water heater, then outdoors, all inside a small plastic film room in the basement, depressurized by the combustion airflow, with a CO detector outside the room.

Nick

Reply to
nicksanspam

This could easily be read entirely differently from what I meant. By "it" I mean, other air circulation equipment. How is other air circulation equipment necessary to exhaust the car's poisonous exhoust gases?

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Reply to
mm

Well, two points need to be made.

  1. Since the generator generates waste heat, air circulation (removal of air) is necessary to prevent overheating of the garage anyway.
  2. Since small leaks can be expected (although not welcomed), small amounts of CO need to be removed. A generator cannot just be welded to a pipe, there need to be some flexible bellows or some such for damping vibration. All these connection could leak. Again, air removal coule help with very small leaks.

I am not at all a "safety weenie" and I did many things that are too risky, myself (and I am not proud of some).

I even considered installing a small generator (a 4 kW coleman diesel POS, not my current Onan DJE) in my garage. I even did stuff to install it, but realized that it was insane and it basically did not work.

I finally sold that Coleman piece of junk and bought a real generator, that actually could be installed in buildings if properly set up, but installed it outside instead.

i
Reply to
Ignoramus607

You must be the new code book poster child? ;-)

I don't know where to start.

It's not about your ability. It's about _liability_.

You must just be trolling.

-zero

Reply to
zero

Good grief, anyone who goes off-grid and thinks they can make it all up with a cheap generator is sadly mistaken.

Reply to
JoeSP

They will learn that, the first time they actually NEED the generator to power something, when it is meserably cold and wet....then they will be back asking questions on why their cheapie generator didn't hold up when they needed it......

Me

Reply to
Me

Unforturnately, some think that switching off the circuit breaker (before turning on generator) is sufficient to isolate generator from AC mains. Then it takes a human death to convince them otherwise. The same switch that connects a generator must first disconnect connection to AC mains. Switch must perform a 'break before make' function. That should be the most important point made here.

A c> They will learn that, the first time they actually NEED the generator to

Reply to
w_tom

Plus, does it pay off to work so hard to make an exhaust piping system for something that may not be likely to live long.

I changed my exhaust to a 3/4" copper ell and tubing 8" in length. Slotted the end of the ell and used a SS hose clamp it to the steel exhaust. Just friction tween the ell and the tube.

The other end goes through a 3/4" hole in a little 1/8" thick rectangle of sheet of asbestos board (from a kiln) attached to a 6" high x 36" wide sheet of plywood that seals the single hung window.

I ran it for 30 minutes today and I could not detect any leaks or shifting.

Not a lot of work.

BTW The generator ran for 30 minutes and nobody in my house even noticed it running.

Reply to
stu

Actually a small exhaust-to-water heat exhanger would provide quite a bit of hot water.

I considered it but I am concerned about the steam flash problem and the other complexities involved.

My system is up and running fine in my garage. We can't hear it running in the house nor can our neighbors.

Here's how I connected the 220 VAC generator cable to the W/H.

220 to 220.

Open one wire of the W/H to the center of a SPDT swtich. One throw to A/C from panel, the other to a SPST switch.

The other end of the SPST switch to Neutral.

(The prongs of the generator plug are of course energized and an plastic insulator cover was fabricated for safety - no touch.)

With grid power, everything normal.

No power, flip off Main Breaker, throw the SPDT switch away from panel to lessen the load on my 3,000 watt generator.

I also flip off all other 220 breakers. Generator is used only for 120 devices and the small breakers.

Plug in cable, start generator. Generator feeds house through W/H breaker.

Hot water needed? Throw the SPST switch to neutral and the H/W heater is using 1/4 the power (~850 Watts) on 120 VAC than it uses at 220.

Simple, efficient, and for me, quite safe.

For photos, email me.

YMMV

Reply to
stu

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