<div dir="ltr">In relation to the explosion part of the question...<div>It is also important to check that the ripple current rating of capacitors is not exceeded.</div><div><br></div><div>Richard</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 1, 2020 at 11:19 AM Stephen Irons <<a href="mailto:stephen@irons.nz">stephen@irons.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div id="gmail-m_-8799095192780379565geary-body" dir="auto">At a previous company, when I did hardware develoment, the policy was 200% maximum design voltage. For example<div><ul><li>Nominal 12 V, with 5% regulator -> maximum design voltage is 12 V x 1.05 = 12.6 V. Minimum capacitor voltage rating: 25.2 V, so you would have to use a 35 V capacitor, not the 25 V one. </li></ul>There was some flexibility. If space or cost were tight, we could probably negotiate the smaller one in this example, because it is all under our control. But for external inputs, where things are less controlled, we would go the other way.</div><div><br></div><div>No idea where you would find 800 V capacitors?</div><div><br></div><div>EV City (Waltham Street) have a Nissan Leaf cut in half (diagonally, so it is still has 4 wheels and is drivable) showing the internal components. I think they also have an open drive unit and control unit. You might be able to see what they use.</div><div><br></div><div>Stephen Irons</div></div><div id="gmail-m_-8799095192780379565geary-quote" dir="auto"><br>On Thu, Oct 1, 2020 at 09:16, Peter Harris <<a href="mailto:petes.username@gmail.com" target="_blank">petes.username@gmail.com</a>> wrote:<br><blockquote type="cite"><div dir="ltr">General question: What is the rule of thumb for selecting the voltage of electrolytic capacitors?<div><br></div><div>Specific question: I am working with a Nissan Leaf battery, the absolute maximum pack voltage is 405V. Are 450V electrolytics likely to explode used at 405V?<br></div><div><br></div><div> P<br></div></div>
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