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Parallel Generator Kit

Bill Green

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Hurricane got my power. I have a 3500 inverter generator but the plug out of the generator doesn't fit my cable to the house. I found a parallel kit that has the right plug. If I run just the one generator off the parallel plug am I going to start a fire or something crazy like that?
 
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rlitman

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Hurricane got my power. I have a 3500 inverter generator but the plug out of the generator doesn't fit my cable to the house. I found a parallel kit that has the right plug. If I run just the one generator off the parallel plug am I going to start a fire or something crazy like that?
Let's see if I'm reading this correctly. Your generator has an outlet, and your house has an inlet, and they don't match up. You found a generator paralleling kit that fits your generator's outlet, and has a new outlet that is compatible with your house's inlet? If that's the case, you would be using the expensive paralleling kit as a plug adapter when a cheap plug adapter would work better for under $10.
 

dcg9381

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Do you have two generators?
The easiest way for us to help you is for you to post photos of the generator and house inlet.

The vast majority of "generator parallel" kits will probably not work for what you want it to do, as they are not 240V, they're actually 120V... Most houses, if wired for a generator inlet are looking for 240V.

Your inverter generator at 3500 watts, it's probably 120V. The good news is that we can probably point you to a cable that will work with the house, but it's only going to power up "some" (single pole) stuff...
 
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Bill Green

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I have a preditor 3500 inverter. I can get a cheap adapter but it will take days to get here. Harbor Freight has a parallel inverter kit with the right outlet. So technically if it isn't an issue I can do a work around and get power to part of my house tonight. I am not running AC, just LED lights and fridges.
 
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Bill Green

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Looks like I answered my own question. Manual says #15: Do not attach a Parallel Kit to only one generator. Looks like I'll be without electricity for a few more days...until the 1,000,000-plus customers get back online. :)

Thanks.
 

rlitman

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I have a preditor 3500 inverter. I can get a cheap adapter but it will take days to get here. Harbor Freight has a parallel inverter kit with the right outlet....
That generator is 120V out only. And their parallel inverter kits (I see a 30A and 50A) are also for 120V only. You still haven't said what the "right outlet" is for your extension cord, but if you're limited to shopping at HF, is this the right plug?
 

dcg9381

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Got it. Most houses are setup for 240V inverter inlets. If you get the "parallel" kit and get all the connections to work, it's likely that you'll have 50% of your circuits have power available.... Just a heads up on that because it only connects to one side of the breaker box.. You'd need a "special" cable to go from the 30A 120V outlet on your generator to the house 240V generator inle
 
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Bill Green

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The cable I need is:


I have an outlet on the house for the power cord. Unfortunately, the cord has the wrong end to the generator. It fits the house though. Poor planning on my part years ago.
 

shannonw

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you need a 240 generator or a protrans type panel where you put your 120v loads you want to switch over to on, is the way to go with those 120v gens ...just easier but so are drop cords.
 
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Bill Green

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Had to find my photo's. Here is what I have and why I need an adapter.
 

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mike93lx

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That is a 120/240v plug on your cord. Hopefully you either don't have anything 240v hooked up or planned to shut off those breakers
 

rlitman

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Looks like I answered my own question. Manual says #15: Do not attach a Parallel Kit to only one generator. Looks like I'll be without electricity for a few more days...until the 1,000,000-plus customers get back online. :)

Thanks.
I found that line in the manual, and my guess is it is because the disconnected ends would be energized. You could easily tape over them, if this is what it takes to power up something for the Mrs tonight.

Also, you don't necessarily need to use the 30A receptacle. The 15A outlets will work too, and it seems that NEMA 5-15P to 14-50R adapters are commonly used for EV chargers (I guess to use a level 2 charger as a level 1). Note that RV adapters bridge the two lines to provide 120V to both halves of your panel (and nothing for 240V breakers), while the EV adapters would not bridge the lines, so only half of your panel will get energized.

Amazon stock can be pretty regional. Here are some alterative options that might be closer (hopefully next-day) to you:
 

dcg9381

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That is a 120/240v plug on your cord. Hopefully you either don't have anything 240v hooked up or planned to shut off those breakers
I assume this won't actually hurt anything, L1 to L2 would just read zero. Correct me if wrong. Nothing "240V" would work....
 

rlitman

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I assume this won't actually hurt anything, L1 to L2 would just read zero. Correct me if wrong. Nothing "240V" would work....
With the EV style adapters I mention above, L1 gets power, but has no continuity to L2, so your L1 circuits would work, and L2 and 240V circuits would not work.

With the RV style adapters, L1 is connected to L2. Everything 120V would see power. Nothing 240V would work. The only risk is that a MWBC would have two in-phase circuits sharing a neutral. If the panel is fed from a 30A source for example, with L1 and L2 of an MWBC each drawing 15A, the neutral which would normally be at 0A, but would see 30A in this situation. But if you're plugging into a 15A breaker on the generator, there's no new risk here anyway.
 

dcg9381

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With the EV style adapters I mention above, L1 gets power, but has no continuity to L2, so your L1 circuits would work, and L2 and 240V circuits would not work.
I "think" with the RV style connectors, you get continuity between L1 and L2. So L1 / N and L2 / N both measure 120V (same phase). L1 to L2 measure 0, as they are in phase. (RVs don't use 240V anyway)
 
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theoldwizard1

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I have a preditor 3500 inverter. I can get a cheap adapter but it will take days to get here. Harbor Freight has a parallel inverter kit with the right outlet. So technically if it isn't an issue I can do a work around and get power to part of my house tonight. I am not running AC, just LED lights and fridges.
Buy the correct male and female plugs. Buy 10/4 SJOOW cord (I had to buy mine on eBay). MAKE YOUR OWN !

Green is ground. White is neutral. Black and Red are the 2 hits. Your generator only has 1 hot, but a YOU SAFELY WIRE THE 2 HOTS IN THE HOUSE TO THE 1 HOT ON THE GENERATOR ! None of your 240V appliances will work.
 

theoldwizard1

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you need a 240 generator or a protrans type panel where you put your 120v loads you want to switch over to on, is the way to go with those 120v gens ...just easier but so are drop cords.
Only if you have 240V appliances. If you do not, SHORT L1 to L2 !

Assuming you have a "legal" inlet AND a proper transfer/interlock nothing will happen. You can run all of your 120V appliances, up to the power limit of your generator.
 
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Bill Green

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ALL:
Thanks for the responses. I hooked the parallel up to the generator and used the plug to the house. I don't have another generator to place on the other side to complete the parallel. 3500 powers the refrigerators, LED lights, floor fans, and other things...but obviously not the AC. It's nice to have light and fans though. Checked throughout the day and no overheating or warmness to the parallel unit.
 

shannonw

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It depends on your prepping purpose, but i store several midea inverter window units for just such an occasion (i'm in a shtf flood zone that get's it frequently) well worth a couple hundred and they only use 4-700 watts. Much easier on fuel burn as they ramp down too thus the inverter gen can ramp down. Lots of people think "i'll buy a 12k gas unit and run my ac" until they see 1/2 gallon fuel burn an hour and do the storage math....
 

dcg9381

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ALL:
Thanks for the responses. I hooked the parallel up to the generator and used the plug to the house. I don't have another generator to place on the other side to complete the parallel. 3500 powers the refrigerators, LED lights, floor fans, and other things...but obviously not the AC. It's nice to have light and fans though. Checked throughout the day and no overheating or warmness to the parallel unit.
It's never going to power the AC, not even in parallel. Most "parallel" kits are for amps, not volts with a few recent exceptions. I made the same mistake thinking I'd get 240V out of a Champion parallel kit to power my welder.. Fail...

I don't see why you can't "parallel" on generator though.. I read the warning above though. It's likely to prevent energizing the "unused" end of that parallel kit, would be my guess.

Never heard this statement before !
RVs don't use 240V. 30A RVs use only "one leg" and 50A RVs use "both legs" but only to neutral, not to L1/L2.
So when you use a 30A outlet with a "50A RV" you have to energize both hots on a 14-50 from a TT-30,,, Hope that makes sense.
 

rlitman

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If you have L1 and L2, you have 240V ! Just depends if the breaker panel/load center allow you to install a 240V (double) breaker !
You're missing my point. The 50A RV adapters short L1 to L2 on the connector 14-50R side, and use a 120V 5-15 or 5-30 plug that only connects to L1 at the source. L1-L2 on such a connected RV panel will give you the same voltage as N-G.
 

wyliesdiesels

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If you have L1 and L2, you have 240V ! Just depends if the breaker panel/load center allow you to install a 240V (double) breaker !
you misunderstood what he was saying. yes 240v is available to the RV but the RV panel and equipment does not make use of the 240v. everything is 120v. Why? So if the RV pulls into a spot that only has 120v available (like a 30a 120v receptacle) all the equipment in the RV can still run on shore power instead of genny
 

dcg9381

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If you have L1 and L2, you have 240V ! Just depends if the breaker panel/load center allow you to install a 240V (double) breaker !
I knew someone would correct me. Yea, you have 240V potential in the wire (4 wire in the case of a "50A" RV). It looks like they use a double pole breaker for the "main input"... I dunno if this is position specific or not, but I've never seen a 240V appliance in an RV, likely because 240V power isn't always available.

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theoldwizard1

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... but I've never seen a 240V appliance in an RV, likely because 240V power isn't always available.
Likely true. Plus do the on board generators make 120V or 240V ?

Pull two of the unused breakers. You should be able to quickly tell if the breaker panel is set up for split phase or not.
 

theoldwizard1

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you misunderstood what he was saying. yes 240v is available to the RV but the RV panel and equipment does not make use of the 240v. everything is 120v. Why? So if the RV pulls into a spot that only has 120v available (like a 30a 120v receptacle) all the equipment in the RV can still run on shore power instead of genny
I understand your point, but that soul mean one leg is pulling the whole load!

If true, wouldn't it be cheaper to just use a TT-30 inlet and a cheaper one leg breaker panel ? If you have 2 A/C units, I would want each to be on a separate leg.
 

TractorJeff

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On a side note; the Solar cabin we stay at is paneled for 240 volt Generator input. The Solar system is 120 volt, hence the cord out of the Inverter is 120 volt connected to both legs of the Cabin panel. THERE IS NO 240 VOLT APPLIANCES!
 

dcg9381

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Likely true. Plus do the on board generators make 120V or 240V ?
In every case I've seen for RV generators (typically Onan) they are "double wound" 120V. 2 x 120V outputs.

If true, wouldn't it be cheaper to just use a TT-30 inlet and a cheaper one leg breaker panel ? If you have 2 A/C units, I would want each to be on a separate leg.
Sure. 'Cept no one wires a home with a "one leg" panel, at least not in traditional residential. So if you're going to use a 120V generator, you've got to light up both legs, which will unfortunately mean they are in-phase and nothing 240V works.

It'd be better to have things on separate legs for sure, but sometimes you've got to roll with the back-up electrical limitations you have.
 
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