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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
  • 27.7k
14 votes

Solar-electric system not generating rated power

Solar panel rating is based on absolutely ideal conditions. Absolutely ideal. In order to get those conditions you need to have a perfectly clear day, freshly cleaned panels, your panels mounted on a ...
Harper - Reinstate Monica's user avatar
13 votes

Will higher BTU A/C inverter not work in room that needs 18K BTU?

This answer only applies to inverter-style mini-splits. Short answer: Yes, you can install a 24K BTU inverter-style mini-split even though the cooling load only calls for 18K BTU, provided that your ...
MTA's user avatar
  • 11.4k
12 votes

Will higher BTU A/C inverter not work in room that needs 18K BTU?

HVAC sizing is a wild guess When trying to determine the correct size for heating or air conditioning, what matters the most is the quality of the insulation in the walls and ceiling the "solar ...
Harper - Reinstate Monica's user avatar
7 votes
Accepted

Bypassing an inverter using manually operated switch

Feed-through and even boost operation are somewhat common inverter features. If I understood correctly, those aren't what you're after. You want to, with switches, have the option to electrically ...
Greg Hill's user avatar
  • 31.2k
6 votes

What kind of inverter do I need for an inductive load?

It's easier to teach a violinist the bongoes than the other way 'round. You should be shopping for an A/C unit with "soft start". This is one of the reasons for these units to exist - ability to ...
Harper - Reinstate Monica's user avatar
5 votes

Protecting high-capacity inverters

The inverter is designed for normal power it sounds like you have abnormally high power issues. Adding a large whole home surge protector is about all you can do. Your inverter protects itself (by ...
Ed Beal's user avatar
  • 103k
5 votes

Should an inverter heat pump be sized according to the conventional AC unit it replaces?

"The ability to throttle the compressor speed" typically (in a good unit) means it can run from rated capacity to about 1/4 rated capacity (so 48K-12K in this case) and below 12K it will ...
Ecnerwal's user avatar
  • 220k
5 votes
Accepted

Does an off-grid solar inverter need to be UL listed?

OK you're a bit confused but straightening that up is what we do :) Any equipment you install in home wiring needs to be approved (NEC 110.2) and that means by UL, CSA, ETL or other "NRTL". ...
Harper - Reinstate Monica's user avatar
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
5 votes

Solar-electric system not generating rated power

It is possible, even likely, that you may get more times of 3.2KW output (and thus, greater total output for a month) on suboptimal days with 410W panels than you would with 330W panels, but it's ...
Ecnerwal's user avatar
  • 220k
5 votes

Bypassing an inverter using manually operated switch

Given your stated requirement: The goal is to charge the batteries during the off-peak "cheaper" hours and to discharge the batteries during the on-peak hours. you are significantly ...
KMJ's user avatar
  • 12k
4 votes

Feasibility of using 18V batteries to power AC tools

It's possible but not as easy as stringing them into an inverter. DeWalt makes a device for this purpose in their 20v line. https://www.dewalt.com/products/gear-and-equipment/generators-and-portable-...
Matthew's user avatar
  • 9,867
4 votes

Can an inverter be supplied by a battery with lower AH than required for designed VA?

Amp*Hours is a unit of capacity. It is the product of current (in A) and time (in hours). A battery rated for 45Ah has enough capacity to output 1A for 45h, or 10A for 4.5h, etc. In theory. Thanks for ...
bobflux's user avatar
  • 10.1k
4 votes

Can I Change The 240V Coming Into the Main Panel To 2 120V Panels?

No need. With most breaker panels, you have alternating rows for the two legs. Using a typical odd-on-the-left and even-on-the-right starting at the top, that means: 1,2,5,6,9,10,13,14,17,18, etc. on ...
manassehkatz-Moving 2 Codidact's user avatar
4 votes

My new inverter has an unusual power output. Will it harm ordinary appliances to use the output described?

This is actually normal for inverter generators. They derive 120V by producing +60V on one leg and -60V on the other. Honda and other small inverter generators are known for this. For example: https://...
supertanker13's user avatar
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

Solar-electric system not generating rated power

NREL has a solar calculator on their website here Using an arbitrary point in California I ran some simulations (using the default value for everything but the DC size and DC/AC ratio) DC rating KW ...
Dean MacGregor's user avatar
4 votes
Accepted

Off Grid Solar System - 250 amps of Inverter capacity - What load center do I use?

Your options are...limited Normally, at the 400A mark, one is dealing with commercial work, and thus is using a full commercial panelboard instead of a residential-style loadcenter; hence, 400A ...
ThreePhaseEel's user avatar
3 votes
Accepted

Battery Backup for 240V (USA) Water Well

Motor startup surge is going to be the biggest issue. You will probably need a 2000W inverter for this. The motor will surely be 240V. Pump motors are run at the highest practicable voltage to reduce ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

Running Tesla Powerwall 2 Off-Grid - Excess Solar Question

Answer collated from comments... Looks like there are three separate things going on here, with an interesting interaction... a Grid Tie inverter This is supposed to shut down when disconnected from ...
user_1818839's user avatar
3 votes

What kind of inverter do I need for an inductive load?

It is not that the compressor motor is inductive, but that, at startup, it draws far more current than while running. This is a characteristic of most electric motors, but is exacerbated because until ...
DrMoishe Pippik's user avatar
3 votes

Feasibility of using 18V batteries to power AC tools

I'm perfectly fearless about proposing bold solutions... but this is NOT one yyou want to pursue. Unless you aim to rewind the motors, stacking batteries means you'd be pumping 230ish volts DC into ...
Harper - Reinstate Monica's user avatar
3 votes

Feasibility of using 18V batteries to power AC tools

Forget the inverter. 99% of portable power tools use what's called a "Universal Motor" which is actually a DC motor that does its own internal rectifying of an AC input. So you can feed DC directly ...
JRaef's user avatar
  • 15k
3 votes

Can I plug my new LG-LW2217IVSM A/C nema 6-15P into a 6-20R with a 20A-240V CB?

The basic answer is: You should be OK. You are looking at the numbers "backwards". A 20A receptacle/breaker/etc. (assuming everything is installed correctly) can safely supply up to 20A total, and up ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes
Accepted

Premium for heatpump inverter technology

The simplest question can have the most complex answer at times. I'll try to help. Variable speed systems have some advantages over single stage or single speed systems. For Florida I would say the ...
BARTOL's user avatar
  • 124
3 votes

Room lights flickering when I connect my desktop computer when running on Inverter

Your desktop computer's PSU draws electricity in a more complicated way than something like a light or fan does. Nothing's really working incorrectly... it's just that the inverter and the power ...
Sneftel's user avatar
  • 557
3 votes

Wiring an inverter into an RV using an contactor (AC Relay)

There's an easier and more passive way to do that thing. And it won't have any vampire draw on the battery. Note that as an RV, you must comply with your territory's electrical code, such as NEC in ...
Harper - Reinstate Monica's user avatar
3 votes

Is there any downside I need to know when I add new solar panels to existing ones?

Solar panels can only be wired in series/parallel if they're identical panels receiving the same amount of sunlight. Otherwise, the whole will be limited by the panel receiving the least sunlight. So ...
bobflux's user avatar
  • 10.1k
3 votes

Solar inverter output protection breaker

If two things are electrically isolated from each other, the voltage between them is ???. Cheap DVMs are extremely high-impedance (hi-Z) and will report nonsense numbers between two disconnected ...
Harper - Reinstate Monica's user avatar

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