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Measuring the loads of the house
#1
Hi all... First post after lurking for a long time. Hopefully its posted in the right spot.

I have a house which is wired up three phase.
Currently I have a 9.88kw solar system on it with an SMA tripower 10KW inverter.

In order to plan for a battery system I would like to first connect a data logger on the main supply to see what my grid in vs grid out vs consumed solar is and the total, peaks and average power consumption numbers are.

I've previously monitored the house but this excluded many things in the shed such as freezers, lights and welding equipment and it wasnt a logging device just a cheap, "keep an eye on it" type thing.

Does anyone have a suggestion for such a device (used is very much OK) that can be attached in there somewhere and log the data to a memory card?
I'm wondering if I need a 6 clamp device? 3 clamps for measuring solar power used and exported and 3 clamps for grid used as the output on grid wires will be measured on the solar exported clamps.

Hopefully this makes sense?

Cheers

Tony
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#2
http://www.iotawatt.com

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#3
(01-14-2019, 09:11 AM)Sean Wrote: http://www.iotawatt.com


That looks like exactly what I am looking for... I'll investigate this one!!!

It seems like rather than use CT's for devices on the Dist Board I can just use them on the phase wires as there are so many inputs available.


Cheers!
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#4
The numerous inputs allows for per circuit logging if required.
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#5
If you're not afraid to build a meter, you can also use the OpenEnergyProject device. I've built this and works really well
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#6
iotawatt is also open source and can be built. I have such a project to but more towards static units like the SDM.
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#7
Took a look at the open energy project device.

I think building the meter would be quite interesting. I have some questions though about how to do this with 3 phase grid tied inverter though.
I do need to measure each phase as the house has a concentration of lights on one phase and power outlets on another. There is also quite a few three phase devices that are used such as A/C and welding equipment.

I'll have to head over to the energy project forum and post some questions perhaps to see if its been done before.

I have no issue however with buying out of the box if it does the job so the iotawatt seems like it could do the job (pity they dont have australian powerplugs for voltage reference though)
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#8
SDM630 can do 3phase but its intrusive. I use several of them. Yeap cost some bucks but its well worth it if you want 100% controll. You get all in 1 device that do everything. It even holds memory. Add ESP or Rasp or other device that do Modbus and your set.
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
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#9
If you go through Open Energy site, they show a diagram where they are reading 3-phase. I don't recall where at though, it's been awhile since I've read through it. Their forum is really active as well and the project managers/designers will respond fairly quickly.
Proceed with caution. Knowledge is Power! Literally! Cool 
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#10
Unfortunately the iotawatt doesnt seem to actually do three phase unless you open the box and remove some components. They are working on a true plug in three phase unit (with proper jacks for 3 voltage references) due out middle 2019.
SDM630 does look like a very simple thing to install to the board ( I have the space on the rails etc ) but would I need 1 or 2 of them.
Not sure about the modbus addons... thats foreign territory to me.

I want to get data on what the solar is making versus exporting and what is being imported for consumption.
I could start with 1 as my first priority is what the consumption is regardless of source.
I want peaks, averages etc logged over a significant time to learn what battery requirements are for the future.
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