36 votes

How to provide backup power to a three-phase European home?

Neutral MATTERS I connected it to the house via an isolator switch, but this just doesn't work well at all. The three outputs measure at 230 each, (how is it 690?) but when I turn anything on, even ...
Harper - Reinstate Monica's user avatar
30 votes
Accepted

Is oil normally this dirty after a 5-hour break-in period of a small inverter generator?

Yes. Many engines are lubricated with a "grease" or heavy oil which is designed to stick to the machined surfaces until they are properly run for the first time. You followed the running-in ...
Solar Mike's user avatar
  • 27.4k
29 votes

Propane appliances throwing orange flames suddenly and generator's back firing

Let's learn about energy: BTUs. Put 1 pound of water (just shy of a pint) on the stove and stick a thermometer in it. Turn the stove on, and watch the water warm up on the thermometer. You're ...
Harper - Reinstate Monica's user avatar
28 votes

Propane appliances throwing orange flames suddenly and generator's back firing

Kris' comment is likely a good reference. Consider to perform a test by operating only one device. If the duration of normal operation increases, or normal operation continues throughout the test, it'...
fred_dot_u's user avatar
  • 10.9k
25 votes
Accepted

Propane appliances throwing orange flames suddenly and generator's back firing

Ask your propane company to check the gas pressure anywhere in the system and then fire all appliances in the system, the low pressure side (after the second stage regulator) should stay above 11 ...
Bill Ball's user avatar
  • 266
22 votes

What happens if you connect the same phase AC (from a generator) to both sides of an electrical panel?

120V hot to neutral is single-phase. 240V hot to hot is also single-phase, indeed the same single-phase, without involving the neutral center-tap on the transformer. The 120V loads see 120V The 240V ...
Ecnerwal's user avatar
  • 215k
21 votes
Accepted

Does the NEC allow a sub panel to be powered by a generator and an automatic transfer switch?

Sure, this isn't an issue What you're proposing isn't a problem at all from a Code standpoint. In fact, it's the normal way automatic transfer is done in facilities that have more complex power needs, ...
ThreePhaseEel's user avatar
19 votes
Accepted

New house generator AC breaker tripping

Found it! It’s the breaker. It’s in the wrong place, because somebody really worked to defeat the keying meant to force it into the right place. This is going to take a little explaining, though. ...
Harper - Reinstate Monica's user avatar
14 votes

How can I ensure a level 2 EV charger will not run while my standby generator is running?

You could split your electric service into two panels: a main and a sub. The main panel would hold all the devices you don't wish to run on generator: EV charger Electric water heater Electric dryer ...
MonkeyZeus's user avatar
  • 16.6k
13 votes

How could this "extension cord" ever be sold?

Obviously, it's possible that a person sitting in an unfriendly nation, can go onto eBay (USA) and add product listings. And then when they get sales, they can ship the items using the USPS ePacket ...
Harper - Reinstate Monica's user avatar
12 votes

How can I plug my portable generator into a "wall outlet"?

You should replace the garage outlet with an inlet, such as this (Amazon, as an example). This way, you can use a standard male-female cord, either a standard extension cord or one made with the ...
DoxyLover's user avatar
  • 12.7k
12 votes
Accepted

using two outlets as extension cord

Yes, and I've done this myself. But not two outlets. The generator side one is an inlet. (These also come in a form-factor that is the same as an outlet). From the inlet, you use in-the-wall ...
Harper - Reinstate Monica's user avatar
12 votes

Can I run my 40 Amp Range Stove partially on a 30 Amp generator

I'd take a third option here. You clearly have a place to store fuel and someplace where you can run it so I would suggest a propane tank and stove. Cheap, very long shelf life so long as it's ...
Loren Pechtel's user avatar
12 votes

How to provide backup power to a three-phase European home?

Harper has identified the issue correctly. I suggest another way of getting the neutral in case your generator is wired as a delta. Many small motors/generators allow both star and delta wiring, ...
Lyman's user avatar
  • 121
11 votes

Portable generator won't start

As gasoline evaporates it leaves a gummy varnish in the carburetor Gasoline sitting for three years in the float bowl of a carburetor will surely lead to some varnish. The hydrocarbons evaporate ...
citizen's user avatar
  • 211
11 votes

8500 W generator with L14-30 plug.. How to access full capacity for house?

Don't worry about it Breakers have a certain latitude to them, and can run slightly above rating for a short time. That provides for motor starting and short term overloads. You're not supposed to ...
Harper - Reinstate Monica's user avatar
11 votes

Can a switchover to backup power be seamless for a whole house?

This already exists COTS The Tesla PowerWall is the most high visibility version, but there are competitors, and you could even knock one together out of golf cart batteries and inverters. What ...
Harper - Reinstate Monica's user avatar
11 votes

What's the best way to connect transfer switch and sub panel?

Get a bigger subpanel You appear to have an automatic transfer switch, and the switching happens there. The 10? 12? space subpanel is just an ordinary run of the mill subpanel. It isn't special, it ...
Harper - Reinstate Monica's user avatar
11 votes
Accepted

Trying to determine how large a generator I need for my minisplit HVAC system

Output (heat or cooling watts) is not what you need here - it's input (electrical) that matters. Look at the label on the compressor for "minimum circuit ampacity" - if the head units are (...
Ecnerwal's user avatar
  • 215k
10 votes

Can I backfeed a portable generator into my house's electrical system?

Old question, but common problem. There IS a sensible, safe, legal middle ground between backfeeding and a full-blown (and expensive) transfer switch: a circuit-breaker panel interlock switch. An ...
Bitbang3r's user avatar
  • 674
10 votes

What happens if you connect the same phase AC (from a generator) to both sides of an electrical panel?

Watch out for your neutral bars! The main issue with feeding the two busses of a split phase panel from the same phase is that if you try to feed both hot busbars at the full rated panel ampacity, you'...
ThreePhaseEel's user avatar
9 votes

Propane appliances throwing orange flames suddenly and generator's back firing

As an HVAC technician, some of these answers you're getting are really bothering me. Do not wrap anything around your tanks, especially anything electrical. They are designed the way they are for a ...
Perdog's user avatar
  • 121
9 votes

How can I ensure a level 2 EV charger will not run while my standby generator is running?

Large enough to carry the load to be served This is the requirement on generator size for ANY installation with an automatic transfer switch. "The Load to be Served" is decided by a NEC ...
Harper - Reinstate Monica's user avatar
9 votes

Does the NEC allow a sub panel to be powered by a generator and an automatic transfer switch?

Don't add an empty subpanel just for new future loads. You should thoughtfully move some existing circuits to the new panel, leaving room in both panels for new future circuits. In the end the sub-...
jay613's user avatar
  • 37.9k
8 votes

Can I get 240v out of a 120v generator?

What you describe won't work, and it's not safe for you (or anyone else) to do what you describe. If you have a single phase 120 volt generator and you need to supply power to a 240 volt split phase ...
EM Fields's user avatar
  • 181
8 votes

Generator connected direct to an Unused Breaker

Yes, but not safely nor legally. There are plenty of resources available explaining the risks of doing so and the right way do it. Here's one: This is dangerous. It is an electrical code violation. ...
isherwood's user avatar
  • 138k
8 votes
Accepted

Can I run my 40 Amp Range Stove partially on a 30 Amp generator

Generally yes can use part of your range. Each burner is different, I've seen 8" burners use up to 2500 watts, smaller can be 1200 to 1500. I have even baked a pie. However I had to trick the ...
NoSparksPlease's user avatar
8 votes

How can I supply 240v power to my home with 120v generators?

Two identical 12V car batteries could deliver 24V, and two identical 120V~ transformers at the same net could deliver 240V~. But two 120V~ generators can not simply be connected in series to get ...
xeeka's user avatar
  • 2,548
8 votes

How can I extend #6 wire in a service panel?

Probably safest for a neophyte: Mac-Block or Polaris connectors of the correct AWG range, and remember that the screws need to be correctly torqued with a torque driver, neither too loose nor too ...
Ecnerwal's user avatar
  • 215k
7 votes

Does "inverter generator" mean it is a "pure sine wave" generator?

Most inverter generators are a "good enough" sine wave. I think you're missing the point of inverter generators. The root problem is that regular gas generators cannot produce a "clean&...
Machavity's user avatar
  • 24.9k

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