[OpenTRV-dev] Getting some OEM stuff
Bo Herrmannsen
EMAIL ADDRESS HIDDEN
Sat Sep 6 10:08:48 BST 2014
will have to look up that design
the main difference between uk and me is that (according to damon) in the
uk the load balancing on 3 phase i done in the street, so every 3rd house
in the street it on same phase
direct oposite in DK all 3 phases are in the house and the load balancing
is done here and can be adjusted if need be, if i remember correct we have
2 3phase sockets for the stove in kitchen and one more for the washer and
dryer in the bath... those 2 sockets go direct to the fuse panel on its own
breaker and then each phase is direct to the incomming
for lights etc there are 2 strings, one goes from the fuse panel round the
flat clockwise until half way in the kitchen. the other string goes anti
clockwise direct to the first socket in the kitchen and then stops half way
in the kitchen just before it would have gone to where the other string
ends.
so a reasonble balancing but could have been better as i have not check
what phase the washer and dryer is on...
but yes it need some thought at least... the fuses are for 10A on the 2
strings each... and for the 2 3phase its 16A each phase... the CT's are
100A... way to high if you ask me... 32A could have done it much better.
2014-09-06 10:54 GMT+02:00 Kevin Wood <EMAIL ADDRESS HIDDEN>:
> I think you should be able to get one EMonTX to do the job. One word of
> warning, though. The current measuring setup on the EMonTx "out of the box"
> has about 100A full scale, and I think the resolution at "normal" levels of
> current draw is not really sufficient for measuring domestic background
> consumption.
>
> I gather from your post that you have 3 phase incoming mains as opposed to
> the single phase domestic supplies that are normal here in the UK. Since
> your consumption is split between 3 phases, current resolution will be all
> the more important.
>
> It's a while since I looked into it, but it might be worth figuring out
> what the resolution will be with the emontx and the current transformers
> you are using.
>
> I believe there was a design posted somewhere on the OEM forums for a
> current measuring setup with range switching to give better resolution.
>
> Best Regards
>
>
> Kevin
>
> On 06/09/14 08:43, Bo Herrmannsen wrote:
>
>> Morning Kevin
>>
>> Its not on purpose that I pester you so much about this, its more that
>> i'm just a 2nd rate PCB monkey and not a very good programmer :-D
>>
>> But it makes sense to go for 868, i did not think of the conrad valves.
>>
>> Logging this morning heat up of hot water to arduino serial console and
>> then my plan is to get the 3 CT's i have back in the fuse box ( they
>> barely fit)
>>
>> is my logic ok here;
>>
>> 1 emon TX v2 should cover all i need in utility closet:
>>
>>
>> heat meter with 2 ways IR com (2 digital pins)
>> water meter with bouncy reed switch (1 digital pin)
>> electricity with 3 ct's and one AC
>>
>> if any pins left then i allready have one DS18B20 chip in the top pocket
>> of the hot water cylinder
>>
>>
>> can one emon TX do the job or do i need 2?
>>
>>
>>
>>
>> 2014-09-06 8:54 GMT+02:00 Kevin Wood <EMAIL ADDRESS HIDDEN
>> <mailto:EMAIL ADDRESS HIDDEN>>:
>>
>> Hi Bo,
>>
>> Been sidetracked onto getting a "boiler node" working for a second
>> home before winter arrives (that's also loosely OEM / Opentrv
>> related, so I'm going in the right general direction!) for the
>> moment but I haven't forgotten about getting OEM working on the
>> OpenTrv!
>>
>> I would say go for 868, on the basis that the OpenTRV stuff is fixed
>> at this due to the rad. valves. That said, the OEM stuff I'm playing
>> with is 433, due to some other requirements I have.
>>
>> Best Regards
>>
>> Kevin
>>
>>
>> On 05/09/14 20:12, Bo Herrmannsen wrote:
>>
>> Just so i dont shoot myself in the foot, but what freq should i
>> choose
>> when getting OEM stuff?
>>
>> I want to plan ahead so that the RFM12Pi module from OEM also can
>> be
>> used to talk to OpenTRV units...
>>
>> I have just figured how to read out my Heat Meter from the IR
>> optical
>> interface which is a 2 way port that requires that you send data
>> and
>> then get data back... so it was not as easy as you would expect...
>>
>> now my next step is to get ready to log the data, for that i
>> need a pi
>> of course and then the radio module and their emontx v3... with
>> some
>> clever thinking that emontx should be able to monitor both water,
>> electricity and heat at the same time...
>>
>>
>> @Kevin: any progress on talking to OpenTRV units from OEM ?
>>
>> --
>>
>> |||||
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>> | Bo Herrmannsen |
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>> | "blessed are the "cracked", |
>> | for its they who let in the light" |
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>> \ ( (_/
>> \_)
>>
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>>
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>> |||||
>> @(~Ô^Ô~)@
>> -------------oOo---U---oOo-------------
>> | |
>> | Bo Herrmannsen |
>> | |
>> | |
>> | "blessed are the "cracked", |
>> | for its they who let in the light" |
>> | Ooo |
>> |_________________ooO____( )________|
>> ( ) ) /
>> \ ( (_/
>> \_)
>>
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--
|||||
@(~Ô^Ô~)@
-------------oOo---U---oOo-------------
| |
| Bo Herrmannsen |
| |
| |
| "blessed are the "cracked", |
| for its they who let in the light" |
| Ooo |
|_________________ooO____( )________|
( ) ) /
\ ( (_/
\_)
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