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const int time_between_readings= 300000;

Why don't you look up the documentation on what int means, then check the documentation on the delay function that uses that value?

the sample sket says it should be in ms and i just thought it would be the time between readings in ms

read the sample sketch again and as i understand it

const int time_between_readings

is used to tell it how long it should sleep on this line

Sleepy::loseSomeTime(time_between_readings);

Forget what you are trying to do, your problem is with your very basic understanding of programming. Look up the documentation on what int means, as in "int time_between_readings"  What is an "int" in the Arduino?

so i tried with a long instead of int.. same result

Have you looked at the documentation for Sleepy::loseSomeTime( ) ?

a few mods to my code was all there is to it

const long time_between_readings= 60000;
 

and

for (byte i = 0; i < 5; ++i)  Edited by mod - Paul

for (byte i = 0; i < 5; i++)
  Sleepy::loseSomeTime(time_between_readings);

change 5 to whatever you want in minutes between readings

the main thing with losesometime is that it only works up to 60 sec in 16 ms intervals

Correct!  You must always check the documentation when you have an unexplained error like that.

Hello Boelle/Robert

I added for (byte i = 0; i < 5; ++i) to ensure that my emontx updated every 5 minutes. But for some reason it updates every 6 minutes instead!

I have checked through the code, but cannot see why it updates every 6 instead of 5.

The file is attached.

Try changing 

(byte i = 0; i < 5; ++i) 

to

(byte i = 0; i < 5; i++)

I'll try that, thanks.