<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1460159985379_6144"><span id="yui_3_16_0_ym19_1_1460159985379_6143">Thanks Steve,</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6159"><span id="yui_3_16_0_ym19_1_1460159985379_6158">I didn't know there was such a calculator.</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6145"><span id="yui_3_16_0_ym19_1_1460159985379_6153">The resistor Kelly supplied was 1K, the link I posted was misleading.</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6212"><span id="yui_3_16_0_ym19_1_1460159985379_6211">I would need to contact Kelly to find out about the capacitors in my controller.</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6213"><span id="yui_3_16_0_ym19_1_1460159985379_6270">I have seen figures elsewhere of anywhere up to 4 seconds delay.</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6214"><span id="yui_3_16_0_ym19_1_1460159985379_6271">The 1k resistor will run my test battery (48V 40ahr) down in about 800 hrs. if I </span></div><div id="yui_3_16_0_ym19_1_1460159985379_6352" dir="ltr"><span id="yui_3_16_0_ym19_1_1460159985379_6385">don't disconnect the battery or resistor; unless there </span><span id="yui_3_16_0_ym19_1_1460159985379_6324">is some electronics that I </span></div><div id="yui_3_16_0_ym19_1_1460159985379_6396" dir="ltr"><span id="yui_3_16_0_ym19_1_1460159985379_6395">don't know about that monitors the state of charge of </span><span id="yui_3_16_0_ym19_1_1460159985379_6326">the capacitors & turns their </span></div><div id="yui_3_16_0_ym19_1_1460159985379_6416" dir="ltr"><span id="yui_3_16_0_ym19_1_1460159985379_6415">power supply off & on.</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6384" dir="ltr"><span>Cheers Alan</span></div><div id="yui_3_16_0_ym19_1_1460159985379_6264"><span id="yui_3_16_0_ym19_1_1460159985379_6263"></span><br></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1460159985379_6146"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1460159985379_6235" style="display: block;"> <div id="yui_3_16_0_ym19_1_1460159985379_6234" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1460159985379_6233" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1460159985379_6237" dir="ltr"> <font id="yui_3_16_0_ym19_1_1460159985379_6236" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1460159985379_6238"> <b><span style="font-weight: bold;">From:</span></b> Stephen Fordyce via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, April 9, 2016 10:50 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Pre-Charge Resistor<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1460159985379_6232"><br><div id="yiv6444784343"><div id="yui_3_16_0_ym19_1_1460159985379_6366"><div id="yui_3_16_0_ym19_1_1460159985379_6383" dir="ltr">Hi Alan,<br clear="none">
Just putting it out there, it could actually take a while to charge a large capacitor bank through a 10k resistor - not sure if you've checked this but there are calculators on the web for that.</div>
<div id="yui_3_16_0_ym19_1_1460159985379_6365" dir="ltr">Cheers,<br clear="none">
Steve</div>
<div class="yiv6444784343gmail_quote" id="yui_3_16_0_ym19_1_1460159985379_6367">On 9 Apr 2016 8:28 am, "Alan James via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><blockquote class="yiv6444784343gmail_quote" id="yui_3_16_0_ym19_1_1460159985379_6371" style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;"><div class="yiv6444784343yqt3278821064" id="yiv6444784343yqt72642"><div id="yui_3_16_0_ym19_1_1460159985379_6370"><div id="yui_3_16_0_ym19_1_1460159985379_6369" style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div><span></span></div><div id="yui_3_16_0_ym19_1_1460159985379_6368" dir="ltr">OK figured out what I am doing.</div><div id="yui_3_16_0_ym19_1_1460159985379_6372" dir="ltr">For this experimental stage I will just have a circuit breaker on the battery + side of the main switch</div><div id="yui_3_16_0_ym19_1_1460159985379_6373" dir="ltr">& pre-charge resistor. I will trip this breaker when finished to take current off the resistor.</div><div id="yui_3_16_0_ym19_1_1460159985379_6374" dir="ltr">When operational on the sub I will have a relay to a solenoid switch.</div><div dir="ltr">When the relay is turned on, the pre-charge resister will see current & charge the capacitors</div><div id="yui_3_16_0_ym19_1_1460159985379_6417" dir="ltr">but there will be a timer circuit with a delay of 1 second before power goes to the solenoid switch.</div><div id="yui_3_16_0_ym19_1_1460159985379_6418" dir="ltr">Cheers Alan<br clear="none"><br clear="none"></div><div id="yui_3_16_0_ym19_1_1460159985379_6424" style="display: block;"> <div id="yui_3_16_0_ym19_1_1460159985379_6423" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1460159985379_6422" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1460159985379_6421" dir="ltr"> <font face="Arial" size="2"> </font><hr size="1"> <b id="yui_3_16_0_ym19_1_1460159985379_6420"><span id="yui_3_16_0_ym19_1_1460159985379_6419" style="font-weight: bold;">From:</span></b> Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, April 9, 2016 4:26 AM<br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] Pre-Charge Resistor<br clear="none"> </div> <div><br clear="none"><div><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><div> Does anyone have any experience with pre-charge resistors.</div><div>I am wiring up my Kelly controller & they provide a pre-charge resistor similar to this one.</div><div dir="ltr"><a href="http://www.electricmotorsport.com/wirewound-pre-charge-resistor-5w-10k-ohms.html" target="_blank" rel="nofollow" shape="rect">http://www.electricmotorsport.com/wirewound-pre-charge-resistor-5w-10k-ohms.html</a></div><div>They are put across the terminals on a main power switch so that they charge up the banks</div><div dir="ltr">of capacitors that motor controllers have. Without them there is a large inrush of current to </div><div dir="ltr">the capacitors that can cause arcing to switches & damage to controller components.</div><div dir="ltr">However if you wire it across the power switch there is always some current going to the</div><div dir="ltr">controller. It probably only drives the ON LED on the motor controller, but I am not sure</div><div dir="ltr">of this. I can have another switch or circuit breaker up stream of the main switch, but you</div><div dir="ltr">would have to turn them on in the right sequence. I have heard of circuits that have delays,</div><div dir="ltr">so that when the power switch is turned on, power runs through the pre-charge resistor first.</div><div dir="ltr">Are there marine switches with built in pre- charge circuits?</div><div dir="ltr">Regards Alan<br clear="none"></div><div><br clear="none"></div><div dir="ltr"><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div></div></div></div><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div> </div> </div> </div></div></div></div><br clear="none">_______________________________________________<br clear="none">
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