<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=EN-US link=blue vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Almost all diesels vehicles have 2 batteries in parallel. Almost all Motorhomes have 2-4 batteries in parallel. The trick is to replace them at the same time. I can give you 50+ more examples if you need them.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Your concept of charging circuits is also in error. As long as the batteries are equal, than charging them is fine. There are 100s of thousands of exambles out there.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Good luck,</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Tom KT4XN</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows 10</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:dcmk1mr2@gmail.com">Martin</a><br><b>Sent: </b>Sunday, July 7, 2019 01:06 PM<br><b>To: </b><a href="mailto:tacos@amrad.org">Tacos</a><br><b>Subject: </b>Connecting 12V batteries in parallel</p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hi All,</p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>A discussion about parallel batteries (12V marine deep cycle) connection for came up. I wonder if anyone can shed some light on this.</p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>There is a claim that connecting two batteries in parallel will result in a death spiral due to the different state of the cells. The claim is diodes must be used to isolate the batteries changing and discharging. I can understand that a parallel battery connection isn't ideal for smart charging circuits.</p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I am pretty sure I have seen commercial gear that had paralleled battery connections and have used them in the past without problems. The use case I had in mind was for Field Day - using precharged batteries in parallel. If capacity is lost due to parallel connection, any estimate?</p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>TNX & 73,</p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Martin</p></div></div><p class=MsoNormal>W6MRR</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>