<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Thanks Jon,</div><div id="AppleMailSignature">I am taking a different tack in my thinking as I am going to use lithium</div><div id="AppleMailSignature">batteries that require a battery management system (bms). These read</div><div id="AppleMailSignature">Volts, amps & some measure heat. I am now looking for a 36V bms that does </div><div id="AppleMailSignature">these three & has a data transfer system that will be compatible with</div><div id="AppleMailSignature">any of the standard inputs on a plc. I may buy shunts for the individual</div><div id="AppleMailSignature">thrusters but then again most motor controllers monitor amps & it may be</div><div id="AppleMailSignature">a matter of using controllers that give me feed back on this.</div><div id="AppleMailSignature">My focus has been on buying the plc but am now finding I need to think</div><div id="AppleMailSignature">through & finalise my electrical system in detail first.</div><div id="AppleMailSignature">Have a talented electronics friend who had worked for Allen Bradley in the</div><div id="AppleMailSignature">90s. He is telling me to go with raspberry over a plc.</div><div id="AppleMailSignature">How is your automation & monitoring system going?</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 24/01/2018, at 3:22 AM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1516684145271_75323"><span></span></div><div id="yui_3_16_0_ym19_1_1516684145271_75323" dir="ltr"><span id="yui_3_16_0_ym19_1_1516684145271_75342">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).</span></div><div id="yui_3_16_0_ym19_1_1516684145271_75323" dir="ltr"><span><br></span></div><div id="yui_3_16_0_ym19_1_1516684145271_75323" dir="ltr"><span>Add "arduino" or "raspberry" to your searches and you'll find stuff that will work with any PLC.</span></div><div id="yui_3_16_0_ym19_1_1516684145271_75323" dir="ltr"><span><br></span></div><div id="yui_3_16_0_ym19_1_1516684145271_75323" dir="ltr"><span>Jon</span></div> <div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1516684145271_75747"><br><br></div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>