### PCB for a maximum of 3x CT's and 3x Voltage for sale

I'm making some PCB's for measuring 3 sets of Current and 3 sets of voltage for use with the Arduino. The boards will be 4" x 3" and have screw terminals for all the connections. If anyone would be interested in one please PM me.

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

just curious, why 3x voltage? one is enough to calculate RMS ?

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

I think it is for 3 phase measurement. If you want correct values, every voltage has to be measured.

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Will all six analogue measurements be taken by just one Arduino?  With the ADC running flat out, it should be able to provide around 32 sets of measurements per mains cycle.

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Yes I'm doing it  for 3 phase measurement and yes 32/33 sets of measurements per mains cycle is what I'm getting with one Arduino, I don't know if you could you could use 3 Arduinos if you wanted as the grounds and +5v would be connected.

I'm doing it as I want to use an Arduino Mega with about 16 dump loads (not all on at the same time!!).

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

I don't know if you could you could use 3 Arduinos if you wanted as the grounds and +5v would be connected.

MartinR knows and yes, you can! His Full-Fat 3-phase monitor uses 3 stacked emonTx's.

Cheers Robert.

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Photo attached of a made up board.

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Hi, it will do either, you would just use a transformer with either 240v or  110v primary input depending on your application.

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

The only thing I find scary here is the 3 phases coming so close together :-P  In europe its 400V over L1 and L2

Any thought if this is a liability ? if it isn't i think its a great board for the 3 phase project.

Wxll

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Hi Wxll,

If it's any help on the actual PCB the closest L1, L2 and L3 come together is actually at the screw connector.

Nick

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

I'd be interested in the boards and also to understand better your application.  I want to put something together which can use my excess 3 phase PV energy to power water heating (a number of separate heaters), and possibly also to charge batteries for an off grid semi-island application.  I am grid connected (3 phase) but would like to be able to use the stored energy when the sun is not shining. This requires a controller which is aware of the energy being produced by the PV arrays, the flow of energy into or out of the system, and something to control the flow of power to and from the batteries.

Are you doing something similar?

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Yes, but only as a single phase system at the moment as my 3 phase still has to be fitted. All the storms here seem to have put things on the back burner with the electric supply company. I got it cheaper because all the system is being replaced under there maintenance so i have to fit in with there timescales.

My sketch is a version of  Robins MK2i for multiloads without the Rf. I have the chargers as my first 6 loads and then the water as my next two and then convector heaters as two after them.

Probably best to PM for more details.

sorry

### Re: PCB for a maximum of 3x CT's and 3x Voltage for sale

Is this board still available? cost?

From your pictures and diagram it looks like it takes full AC voltage (for Australia this will be 415V between phases) and has fuse protection?

It has 5v output? DC to power an Arduino?

Does this measure the direction of current? (I need to know if I am importing or exporting power)

How would I connect this to an Arduino so I can transmit results back wirelessly to rfm12pi raspberry pi base station receiver b

I am close to investing in some outback infrastructure with a bank of 48v gell 330AH batteries for load shifting.

I am hoping to control outback from python with raspberry pi and turn it on and off based on wireless data provided from your board.

With power now \$0.38 - \$0.40kWh in Australia is parity to investing in a set of batteries and charging them when my access solar.