On one cct I would like to record the power over time .... kwh would be
I know you can get small kwh modules such as ....
Though these are instantaneous ... need something that can record
cumulative .. or at least until reset or similar ....
In case someone suggest a mechanical device - don't want to go that route.
The one you point to above measures kWh, according to the posting
and the 5th photo.
The terminals don't look like they're rated anywhere near the 20A
or 30A claimed max current though. In one place it implies it uses
an external current transformer, but the wiring diagram doesn't
[email address is not usable -- followup in the newsgroup]
Then I agree with Andrew and that I'm not sure those terminals would
be good for 20A (Max 30A)?
I was considering a good 'capacity' meter for my electric outboard
motor / battery combo but I think because the capacity varies with
load it might be a difficult ask.
Cheers, T i m
On Tuesday, 13 September 2016 08:54:13 UTC+1, T i m wrote:
The meter indicated is AC. It won't work on your DC battery.
If you have an AC motor with electronic inverter speed control, it could be fitted between the motor and the speed controller.
Unless the speed control output is three phase. Which is quite likely.
In which case you'd need three of them.
The easiest way to determine how much power remains in your battery is a voltmeter.
It will give indication but only under load, ie, when the motor is actually running.
You may find the inverter (if that's what you have) will shut down below a certain battery voltage.
Good spot .... if I used that one, with current transformer .. might
give what I want.
Description says ..."save cumulative power" implies it does record
what I need.
I have pinged a question to them .... see what they come back with.
Never used a current pick up transformer before, would extending the
leads be much of an issue ... would need around 2m.
Some of the energy monitors "given away" by the utility companies had
memories to store usage over a week/month. Some had USB interfaces where
you could plug them into a computer and as long as the computer was on
would log the power usage.
These types uses a remote current transformer/sender which normally
clips on to the household incoming mains cable and a seperate receiver
which displays usage etc.
Depending on application, something such as
Various different models on Ebay with more/less functionality.
The OP didn't tell us what kind of range they need, so it's difficult to
tell how accurate they need to be. I suspect those aren't very accurate for
measuring things in the tens of watts or below.
I recently looked for a plug-in monitor with remote data capability and the
best I could find was this:
(available elsewhere for less)
adding a 4 pound Raspberry Pi Zero if needs be.
OK ... should have explained.
I have a PV array on my roof and it dumps any spare generated power into
my immersion heater.
Just thought adding a kwh recording device would be useful for me to see
how much I am 'storing'
So measuring between 0 to 3kw power supplied.
What is it with all these left brainers and everything being down to
'cost'. Why couldn't someone just be interested in seeing what is
going on and not mind spending some money  to see / measure that?
Cheers, T i m
 Especially in the case of PV and the FIT as it's mostly 'our'
money they are spending! ;-)
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