salyavin
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Re: How many amps for new 240V install?

Sun Jan 19, 2020 10:28 pm

100A wow! Is that not the limit for a common home? I just installed 50A at my home with an openevse but I did see a coworker with a Tesla charger where the electrician installed a 60A which seems to be what Tesla wants if you see one of those Tesla home chargers in your future. I figure 40A is enough for home. I'll typically have enough to drive a family member to a nearby hospital if something crazy happened otherwise I am already maxing out the Leaf onboard charger. I do not see a sudden emergency long distance road trip as likely.

wwhitney
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Re: Aluminum wiring?

Sun Jan 19, 2020 10:41 pm

nlspace wrote:
Sun Jan 19, 2020 9:23 pm
Aluminum wire creeps under the pressure of the screw terminals, which results in looseness of the electrical connection
To my knowledge, this was a problem with the aluminum wire alloy used in the 60's and 70's, AA-1350, but is not a significant problem with the modern aluminum alloy AA-8000 when used with terminals rated for aluminum. So as long as the EVSE terminals are rated for aluminum, I wouldn't hesitate to use aluminum wire.

Cheers, Wayne

goldbrick
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Re: How many amps for new 240V install?

Mon Jan 20, 2020 12:48 pm

salyavin wrote:
Sun Jan 19, 2020 10:28 pm
100A wow! Is that not the limit for a common home?
Most modern homes use 200A service I believe. I just installed a new 200A service at my house although I probably rarely use more than 40A at any one time. The main reason I did that upgrade is so that my (yet to be installed) solar system won't be limited by the service entry equipment.

The wire is the biggest cost difference since a 100A sub-panel will cost about the same as a 50A sub-panel, ditto for the breakers. Opening the walls and running the wires is the same. I could probably save $50 by using a smaller gauge cable but since the EVSE will already need a 35A circuit I thought I'd just give myself some headroom for the future and spend the extra $ now.

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jlv
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Re: How many amps for new 240V install?

Mon Jan 20, 2020 1:24 pm

I ran a 50A circuit to the garage to use my 40A Tesla UMC1 with a 14-50 plug. That's good enough for charging our 2 cars even though the cars could take more (my S has the 48A OBC, while our X has a 72A OBC).

Of course, I got a free Tesla HPWC from a referral last year, and that deliver up to 80A (on a 100A circuit). If I had better planned ahead, I probably would have run at least a 60A circuit to the garage to allow me to charge at 48A.
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EatsShootsandLeafs
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Re: Aluminum wiring?

Mon Jan 20, 2020 3:49 pm

nlspace wrote:
Sun Jan 19, 2020 9:23 pm
It's not cheaper if your house catches on fire.

Aluminum wire creeps under the pressure of the screw terminals, which results in looseness of the electrical connection, then arcing across the gap occurs and generates heat in the junction.

Special grease and fittings are used with aluminum wire in an attempt to mitigate this, but periodic inspection and re-tightening of the bolts and screws are needed. Aluminum may be used for the transformer pole-to-house wiring, but usually crimp lugs are used to make those junctions.

Use copper and sleep easy, just consider the cost difference as cheap fire insurance.
I didn't know they did aluminum still for residential...

The new house is on a 200A breaker. That's the standard on homes around here. My current one was made mid 2000's and is on 200a also.

Kind of leaning to 50 amp breaker, 60 amp capable wire, and 14-50, so that I don't need to worry about adapters, then the wire is there if I ever need it with a new breaker.

smkettner
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Re: How many amps for new 240V install?

Mon Jan 20, 2020 5:26 pm

What is the max amps for a LEAF these days? I still think 24 amps charging on a 30 amp circuit is way plenty even for a Tesla/Rivian with max battery.
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LeftieBiker
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Re: How many amps for new 240V install?

Mon Jan 20, 2020 7:17 pm

smkettner wrote:
Mon Jan 20, 2020 5:26 pm
What is the max amps for a LEAF these days? I still think 24 amps charging on a 30 amp circuit is way plenty even for a Tesla/Rivian with max battery.
AFAIK still 27.5 amps. I hear 7.7kw mentioned occasionally, but again, AFAIK, it hasn't been implemented. They are still relying on DCFC speeds, ironically.
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Flyct
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Re: Aluminum wiring?

Mon Jan 20, 2020 7:29 pm

Kind of leaning to 50 amp breaker, 60 amp capable wire, and 14-50, so that I don't need to worry about adapters, then the wire is there if I ever need it with a new breaker.
Smart move.

I have an older Schneider Eaton hard wired EVSE at my house since 2015. Its wired with #6 THHN which is good to 65 amps, but it’s protected with a 40 amp breaker since the ESEV draws max 30 amps. It’s served me very well for about 4 years now charging my 2015, then 2018 leafs, and now my 2019 Leaf plus. It puts in 25 miles of range each hour the car is being charged.

At the barn/shed at our country vacation house I also ran #6 in flex conduit to a 14-50R receptacle. That is protected with a 40 amp breaker. I bought a spare Nissan 120/240 ESEV plugged on eBay for about $250 and leave it there all the time. I turn that breaker on only when charging. I may be using that receptacle for my RV at times.

There’s another one listed right now on eBay https://www.ebay.com/itm/2019-Nissan-Le ... 4602333350

Picture of the Hard wired Eaton in garage at house. It’s right below the CB panel.

Image


Here’s the one in the barn at country vacation house as I was wiring it. If you look closely it’s connected to a 40 amp breaker in the barn 60 amp sub-panel.

Image
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Oilpan4
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Re: How many amps for new 240V install?

Tue Jan 21, 2020 1:26 am

Aluminum wire inside an inhabited structure?
Hell no.
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Is going to get you.

EatsShootsandLeafs
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Re: Aluminum wiring?

Tue Jan 21, 2020 3:55 am

Flyct wrote:
Mon Jan 20, 2020 7:29 pm
Kind of leaning to 50 amp breaker, 60 amp capable wire, and 14-50, so that I don't need to worry about adapters, then the wire is there if I ever need it with a new breaker.
Smart move.

I have an older Schneider Eaton hard wired EVSE at my house since 2015. Its wired with #6 THHN which is good to 65 amps, but it’s protected with a 40 amp breaker since the ESEV draws max 30 amps. It’s served me very well for about 4 years now charging my 2015, then 2018 leafs, and now my 2019 Leaf plus. It puts in 25 miles of range each hour the car is being charged.

At the barn/shed at our country vacation house I also ran #6 in flex conduit to a 14-50R receptacle. That is protected with a 40 amp breaker. I bought a spare Nissan 120/240 ESEV plugged on eBay for about $250 and leave it there all the time. I turn that breaker on only when charging. I may be using that receptacle for my RV at times.

There’s another one listed right now on eBay https://www.ebay.com/itm/2019-Nissan-Le ... 4602333350

Picture of the Hard wired Eaton in garage at house. It’s right below the CB panel.

Image


Here’s the one in the barn at country vacation house as I was wiring it. If you look closely it’s connected to a 40 amp breaker in the barn 60 amp sub-panel.

Image
That's a lot of wall switches :)

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