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37 votes
Accepted

Getting UPS Power from One Room to Another

You need an inlet in Room A, not an outlet You'll need an outlet box with an inlet in it in Room A so that you can plug the output of the UPS into it with a proper cord (read: if you have to do weird ...
ThreePhaseEel's user avatar
13 votes

Trying to power two panels from one generator

There are no two ways about it: either you have an automatic transfer switch or you have a manual interlock. A checklist item that says "turn off the disconnect outside" will not suffice. ...
Greg Hill's user avatar
  • 30.8k
11 votes
Accepted

Can a Backup Generator SubPanel Neutral be tied to the Main Panels Neutral bus, if both panels are energized at the same time from different sources?

We see a lot of really horrid transfer switches on this forum, believe you me. The Backup Generator Subpanel (Siemens - gray panel) is my "economic" version of a Transfer Switch, with a ...
Harper - Reinstate Monica'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
  • 2,552
8 votes

Electric backup just for heating system?

Completely not insane at all. However if you say that in the Rust Belt, you will be arrested for ThoughtCrime. They're not allowed to have truly electricity-free furnaces such as Williams or Empire ...
Harper - Reinstate Monica's user avatar
8 votes

Electric backup just for heating system?

It's not sane. Because, for a little additional time and money you can get a LOT more. Like, twice the cost and 1.5 times the effort gets you 50 times the functionality. Yes, you COULD set up an ...
jay613's user avatar
  • 39.4k
8 votes

Trying to power two panels from one generator

On this forum, we've been around the block on this issue several times. People often want to feed two panels typically because the two panels are the two 200A panels fed by a 400A service. It cannot ...
Harper - Reinstate Monica's user avatar
7 votes

Replicate "Behind Wall TV Power" - Idea or Explosion?

Inlet/outlet is perfectly reasonable here. A few things to consider: The typical "kit" will be a fixed, relatively short, length. So the right way to do this between floors is full-fledged ...
manassehkatz-Moving 2 Codidact's user avatar
6 votes
Accepted

How can I achieve blackout resilience on a grid-connected solar installation?

There are 3 basic types of alternative energy installations: Grid-tied Off-grid Hybrid What you have is grid-tied which is absolutely required to shutdown within just a few milliseconds in the event ...
jwh20's user avatar
  • 23.4k
5 votes

Getting UPS Power from One Room to Another

Yes. You are allowed to use standard practices for in-wall wiring to build a "runt circuit" that goes A to B to C to D and does not actually go to any service panel. You fit standard outlets in all ...
Harper - Reinstate Monica's user avatar
5 votes

Getting UPS Power from One Room to Another

I have a feeling you will find this to be quite a bit more involved than you originally expected. In addition to whatever other code issues involved in setting up a power "inlet" in Room A (as opposed ...
manassehkatz-Moving 2 Codidact's user avatar
5 votes

"power buffer" in front of generator for peak power shaving?

Buy a (petrol-fired) air compressor and pneumatic tools, or go for a bigger generator. (Good) Inverter can cost nearly as much as a generator, also remember that an inverter rated for 2kW has a ...
DDS's user avatar
  • 2,383
5 votes
Accepted

Will a consumer UPS clean up power from a conventional genetator

A regular consumer UPS will keep the voltage within acceptable limits for electronic equipment, but it won't do much cleanup of electrical noise or irregular frequency while it's powering the ...
fixer1234's user avatar
  • 6,118
5 votes
Accepted

Trying to practically size a generator

Question 1 no. Question 2 "look at the nameplate". The rest of this answer is a frame challenge - that's why it doesn't 'answer the question'. The frame challenge is: No, you can't do that....
Harper - Reinstate Monica's user avatar
5 votes

Trying to power two panels from one generator

You can't feed two panels from one generator because if one neutral fails, and assuming both panels are ground bonded to the same plumbing or grounding rods, current will be routed through the grounds ...
jay613's user avatar
  • 39.4k
5 votes

Can micro inverters be fooled to feed back-up when grid is down?

First, if first-floor flooding is something you need to think about, absolutely forget about using AC power unless your entire service is set up for that to work. Your service drop must be overhead ...
Harper - Reinstate Monica's user avatar
4 votes

Distribution of lengths of power outages

Ask your local regulatory agency. They will probably have that information. However, the usual practice for anything but critical servers is to decide how long you will need to finish what you were ...
keshlam's user avatar
  • 29.6k
4 votes

What do i need to stop my computer from rebooting in electricity fluctuations

Not wishing to state the obvious, but really, the first thing to do is resolve the power fluctuations if at all possible. Assuming that's out of your control, then a decent UPS should be able to ...
Dan's user avatar
  • 262
4 votes

How to use two UPS one online and the other as backup?

You want an automatic transfer switch The device you want is called an automatic transfer switch (ATS for short) and should be readily available through an electrical supply house (or equivalent) in ...
ThreePhaseEel's user avatar
4 votes
Accepted

feeding both sides of load center from 120vac backup source

No "checklists"! Hard-built interlocks only. There is no such thing as "making sure your main breaker and 2-pole breakers are turned off". You must not do generator interlocking via a checklist or ...
Harper - Reinstate Monica's user avatar
4 votes

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

Doesn't work. They're not in phase This is part of why Thomas Edison hated AC power. It's very hard to understand, what with the flux vectors, phasing and all that jazz. Tesla was a genius, and ...
Harper - Reinstate Monica's user avatar
4 votes

Electric backup just for heating system?

Not insane at all. When we had an extended power outage due to a windstorm a few years ago, I'd take a UPS to work with me, plug it in all day to charge, then take it back home to power our gas stove ...
Chris O's user avatar
  • 6,795
4 votes

Does it Matter if I use a 50 amp breaker in my main panel to hook up a 30 amp generator?

The generator presumably has a 30A breaker of its own, which protects the generator. Using a larger input breaker with appropriate gauge wires and 50A inlet (for the 50A breaker on the inlet) is fine. ...
Ecnerwal's user avatar
  • 218k
4 votes

Can micro inverters be fooled to feed back-up when grid is down?

Stop thinking like a box-pusher The problem you're having is that you're thinking like a box-pusher who expects everything to be system-integrated for you. Instead, with backup, you'll want to at ...
ThreePhaseEel's user avatar
4 votes

Looking for a whole home battery backup or generator

Consider using a dual fuel alternator, you can keep propane forever it does not go bad and is readily available. If for some reason you cannot get propane when the need arises you can get gasoline. ...
Gil's user avatar
  • 7,011
3 votes
Accepted

How to deal with a Diesel generator (PDU6500E)?

The battery is dead Sandy was 2012 and 7 years is better than average for a starting battery. Given that this is emergency equipment, you really ought to replace it prophylactically well before that. ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

What is in the 4-pin DC cable?

The images in the eBay post show a 12v 7a power supply with a pinout on the power brick. The pinout shows only a 12v positive (pin) and ground (barrel). The connector is called a 4P Power Snap and ...
fred_dot_u's user avatar
  • 10.9k
3 votes

20 kW generator overkill for a home?

You can't average the monthly usage over a number of days because the loads aren't constant. Consider the following two scenarios: A 100W light bulb that's turned on constantly for the whole month (...
mmathis's user avatar
  • 8,872
3 votes
Accepted

"power buffer" in front of generator for peak power shaving?

AC power cannot be stored because AC is dynamically changing (to be more precise, alternating). It requires very expensive hardware to arbitrage it for other types of energy which are storeable, and ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

Can I use a heavy gauge extension cord from the wall to a UPS?

It's a heavy load like an air conditioner, so use an air conditioner extension cord. Manufacturers can be greedy/cheap about sizing extension cords, using the absolute minimum UL requires for ...
Harper - Reinstate Monica's user avatar

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