[PSUBS-MAILIST] Ammeter / PLC Question

[Alan via Personal_Submersibles]

Thanks Jon,
I am taking a different tack in my thinking as I am going to use lithium
batteries that require a battery management system (bms). These read
Volts, amps & some measure heat. I am now looking for a 36V bms that does 
these three & has a data transfer system that will be compatible with
any of the standard inputs on a plc. I may buy shunts for the individual
thrusters but then again most motor controllers monitor amps & it may be
a matter of using controllers that give me feed back on this.
My focus has been on buying the plc but am now finding I need to think
through & finalise my electrical system in detail first.
Have a talented electronics friend who had worked for Allen Bradley in the
90s. He is telling me to go with raspberry over a plc.
How is your automation & monitoring system going?
Alan



Sent from my iPad

> On 24/01/2018, at 3:22 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Are you just looking for something ready-made Alan?  Voltage divider is an easy/cheap way of measuring voltage.  Shunt resistor is best way I've seen for current and there are some that measure up to 50A for $15(US).
> 
> Add "arduino" or "raspberry" to your searches and you'll find stuff that will work with any PLC.
> 
> Jon
> 
> 
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