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Re: San Diego Leaf Fanatics!

Posted: Thu Oct 07, 2010 8:01 am
by ttweed
GroundLoop wrote:
Jimmydreams wrote: I thought the SDG&E guy said that there were NO UL listed DMA's in North America. What we will wind up getting is still up in the sir. :?
Yes, that's what I heard too. EV-TOU-3 is effectively finished, and something subtractive (as yet unpublished) will take its place within a week or so.

(This is in addition to the EV Project experimental plan.)
Hmmm. maybe I heard him wrong, but I remember him pointing at the EV TOU3 category at the bottom of this slide and saying we will all be in that group. I do remember him saying that the current DMA is being phased out and that the $9.32/month charge for it is waived for the trial, but i thought they had a replacement unit to use???

TT

Re: San Diego Leaf Fanatics!

Posted: Thu Oct 07, 2010 8:03 am
by GroundLoop
It's a long story.. The housing is fabricated by a 3D printer in La Jolla (xardas.com)
using a free model from the engineer at solarshare.net:
Image
Image

Although now you can buy them pre-made from Tespro Electronics of China:
tspro.com.cn
TP-232-ANSI-U is about $115, and comes weatherproofed.

The best is GE's own SmartCoupler:
SC-1A (serial port) GE SmartCoupler #9937276016
but good luck finding one.

Re: San Diego Leaf Fanatics!

Posted: Thu Oct 07, 2010 8:09 am
by LEAFer
Thanks! 8-)

Re: San Diego Leaf Fanatics!

Posted: Thu Oct 07, 2010 2:57 pm
by garygid
What kind of meters have this IR interface?

How can one tell if their existing meter has the IR "port"?

Which PUs can/will provide a meter with this IR interface?

From the IR tranceiver, how do you connect to a PC to "gather" the data (perhaps RS232 or RS485)?

Yes, I would like to understand the hardware (are there schematics?), and software (code if possible, please).

Re: San Diego Leaf Fanatics!

Posted: Fri Oct 08, 2010 1:35 am
by DaveEV
sdbonez wrote:No aquarium...but tons of equipment. Let's put it this way... I count more than 30 actively-registered network-enabled devices on my non-public network. Gas range, Gas Dryer, and again, we use the A/C like it's going out of style. 2 3-ton A/C units (18 Seer, I believe) and a big house. A/C is a big piece but the equipment draw is significant as well. Some day, I'll figure out what the spread is.
Your usage data is interesting - 3-ton AC units are probably hooked up to a 30A circuit and probably draw about 16A in high stage (are they multi-stage or single stage units?). If you run them all the time, I suspect that they would contribute significantly to your power usage - yet your power usage is surprisingly flat year round and July was a record minimum in usage when I'd expect to see a big peak in the summer.

Is your A/C actually a heat pump and you use it for heating, too? Maybe you have the temperature range set extremely tight so it's nearly always running?

Or maybe the A/C isn't really using that much power and your network of devices are sucking down the juice. 30 network devices drawing 25-50W each would certainly account for a lot of your consumption.

Re: San Diego Leaf Fanatics!

Posted: Fri Oct 08, 2010 8:02 am
by GroundLoop
garygid wrote:What kind of meters have this IR interface?

How can one tell if their existing meter has the IR "port"?

Which PUs can/will provide a meter with this IR interface?

From the IR tranceiver, how do you connect to a PC to "gather" the data (perhaps RS232 or RS485)?

Yes, I would like to understand the hardware (are there schematics?), and software (code if possible, please).
The ANSI 12.18 port looks like this:
Image

If you have a digital meter (no spinning dials), then you probably have one of these ports.
SDG&E recently bumped most users to the iTron digital meters, which have it.

The protocol is optical RS-232, essentially, so the simple adapters are just IR to RS-232 converters. I'll dig around for the schematics, but really, for $115, get the Chinese one that's available now. Much easier, more weatherproof, and less bulky than my old one.

Re: San Diego Leaf Fanatics!

Posted: Fri Oct 08, 2010 8:13 am
by garygid
Thanks, mine is the "spinning disc" type.

Can these iTron digital meters "run backwards" for Net Metering of PV generation.

Are they what is used for TOD metering?

Are those the two LEDs below, and a mounting post of some sort above them?

Do you happen to have a link to a trustworthy source for the "China-made" interface?

Thanks again.

Re: San Diego Leaf Fanatics!

Posted: Fri Oct 08, 2010 8:42 am
by GroundLoop
garygid wrote:Thanks, mine is the "spinning disc" type.
No port, then?
Can these iTron digital meters "run backwards" for Net Metering of PV generation.
Apparently not. They run forward if you generate. That's why I'm still on the old meter.
Are they what is used for TOD metering?
I would think so, but I don't know for sure.
Are those the two LEDs below, and a mounting post of some sort above them?
It's a metal plate (for magnetic attachment) with two light pipes in it. One Tx, one Rx. It's really just a pass-through for the plastic cover.
Do you happen to have a link to a trustworthy source for the "China-made" interface?
I got two of them from here:
http://tspro.com.cn/

Re: San Diego Leaf Fanatics!

Posted: Fri Oct 08, 2010 1:59 pm
by DaveEV
GroundLoop wrote:I got two of them from here:
http://tspro.com.cn/
I believe this is the right site: http://www.tespro.com.cn/

Did you just send them an email or something? They don't appear to have a web store.

Re: San Diego Leaf Fanatics!

Posted: Fri Oct 08, 2010 5:21 pm
by sdbonez
drees wrote:Your usage data is interesting - 3-ton AC units are probably hooked up to a 30A circuit and probably draw about 16A in high stage (are they multi-stage or single stage units?).
Had never looked - but each one is actually rated for a 30A circuit..but they're each on two, half-height 40A breakers. They are dual-stage units. Carrier 38TSA036 http://www.docs.hvacpartners.com/idc/gr ... sa-8pd.pdf says Rated Load Amps are at 15.4A.
drees wrote:If you run them all the time, I suspect that they would contribute significantly to your power usage - yet your power usage is surprisingly flat year round and July was a record minimum in usage when I'd expect to see a big peak in the summer.

Is your A/C actually a heat pump and you use it for heating, too? Maybe you have the temperature range set extremely tight so it's nearly always running?

Or maybe the A/C isn't really using that much power and your network of devices are sucking down the juice. 30 network devices drawing 25-50W each would certainly account for a lot of your consumption.
Two simple reasons: our temps we lower than normal and I was in Hawaii (with the A/C off) for two weeks :)