{"id":91,"date":"2026-07-05T00:00:00","date_gmt":"2026-07-05T00:00:00","guid":{"rendered":"http:\/\/stealthbus-91"},"modified":"2026-07-06T20:06:26","modified_gmt":"2026-07-06T20:06:26","slug":"batteries","status":"publish","type":"page","link":"https:\/\/stealthbus.net\/?page_id=91","title":{"rendered":"Battery Pack #1 : Lead"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The part of the project that arguably could make or break it. I have thought up two approaches to this issue:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Buy the cheapest off the shelf batteries in Costco and experiment \u2013 run a series of on road tests and get and idea of range \/ capacity in the real world. From here I would have useful stats about increasing power \/ range.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Buy high end batteries (Trojan look good) then put some real effort into getting the battery design right \u2013 and try to get right first time.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Option 1, Costco batteries<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Costco have a 12v \/ 115Ah Marine \/ Deep cycle battery for $84 \u2013 trying to determine the OEM so I can run the numbers with evconvert calculator.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Useful web link: <a href=\"http:\/\/www.evconvert.com\/tools\/evcalc\/?s=b\">http:\/\/www.evconvert.com\/tools\/evcalc\/?s=b<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Using 12 batteries = $1008 + GA sales tax (6%)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Brought 2 x Costco batteries purchased for measurements \/ experimentation<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Option 2, Using Trojan 6V<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Requires 24 batteries @ $130 \/ each = $3,120<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most important consideration with the batteries is the potential range. I have settled on 144v in the previous discussion about controller and motor. Using 144v will drive using either 12 x 12v, 18 x 8v or 24 x 6v for the battery configuration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Option 3, C&amp;D Technologies (Dynasty UPS) &#8211; &#8220;Max Rate&#8221;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">David offered option for a set of 12 second hand C&amp;D Technologies AGM cell.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Battery specifications:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">12v, AGM, 138Ah capacity<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"http:\/\/www.cdpowercom.com\/product\/battery\/vrla\/pdf\/mr12_490.pdf\">http:\/\/www.cdpowercom.com\/product\/battery\/vrla\/pdf\/mr12_490.pdf<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Getting their first charge&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/stealthbus\/images\/IMG_5355.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Planned layout<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/stealthbus\/images\/batterylayout.png\" alt=\"\"><br>\n<a href=\"\/wp-content\/uploads\/stealthbus\/pdf\/battery-layout-B.pdf\">battery-layout-B.pdf<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">State of charge calculations<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Charge<\/td><td>Volts per battery<\/td><td>Pack voltage<\/td><\/tr><tr><td>100%<\/td><td>12.65+<\/td><td>152<\/td><\/tr><tr><td>75%<\/td><td>12.45<\/td><td>149<\/td><\/tr><tr><td>50%<\/td><td>12.24<\/td><td>147<\/td><\/tr><tr><td>25%<\/td><td>12.06<\/td><td>144<\/td><\/tr><tr><td>0%<\/td><td>11.85<\/td><td>142<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Battery log \/ management system<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Battery log &#8211; Manual measurements of battery voltages before and after various trips.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BMS &#8211; Design and work to build a automatic monitoring systems<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Journal entries<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">2009 08 11 &#8211; Took delivery of 12 x C &amp; D Technology, Dynasty Series, &#8220;Max Rate&#8221; AGM batteries<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2009 08 12 &#8211; Rigged up a parallel charging harness and to allow a low rate charge (2A) using a standard automatic charger (on AGM setting.)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2009 10 19 &#8211; Battery racks in place<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The part of the project that arguably could make or break it. I have thought up two approaches to this issue: Buy the cheapest off the shelf batteries in Costco and experiment \u2013 run a series of on road tests and get and idea of range \/ capacity in the real world. From here I [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[9,28],"class_list":["post-91","page","type-page","status-publish","hentry","category-battery","category-lead"],"_links":{"self":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages\/91","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stealthbus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=91"}],"version-history":[{"count":7,"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages\/91\/revisions"}],"predecessor-version":[{"id":1119,"href":"https:\/\/stealthbus.net\/index.php?rest_route=\/wp\/v2\/pages\/91\/revisions\/1119"}],"wp:attachment":[{"href":"https:\/\/stealthbus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=91"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stealthbus.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=91"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}