{"id":56,"date":"2011-08-17T22:39:27","date_gmt":"2011-08-18T05:39:27","guid":{"rendered":"http:\/\/www.ejetta.com\/?p=56"},"modified":"2011-08-17T22:39:27","modified_gmt":"2011-08-18T05:39:27","slug":"linkpro-amps","status":"publish","type":"post","link":"http:\/\/www.ejetta.com\/?p=56","title":{"rendered":"LinkPRO Amps"},"content":{"rendered":"

I’m using a Xantrex LinkPRO as my only EV-specific instrumentation. I have a interface box that a friend built. The interface box scales the pack voltage down and also isolates the RS-232 output from the LinkPRO. I have a Deltec 50mA\/500amp shunt in series with my pack for measuring current. The shunt connects directly to the LinkPRO (it doesn’t go through the interface box). <\/p>\n

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I had been getting really bogus numbers for my amps readings. Like, never over 100 amps. I could tell from the log data from the Soliton Jr. that I was hitting the pack current limit (set to 250 amps). <\/p>\n

This puzzled me for a long time. I tried using different kinds of twisted pair cable and shielded cable to connect the shunt to the LinkPRO. I tried all the settings in the LinkPRO that looked relevant. I tried telling the LinkPRO that I really had a 900 amp shunt. <\/p>\n

Finally, I tried changing the mode on my Soliton Jr. from “Performance” to “Quiet”. Performance mode switches at 8 kHz. Quiet mode switches at 14 kHz. This seems to have fixed the problem. I see current readings from 0 up to my set limit of 250 amps. <\/p>\n

My best guess is the the LinkPRO sampling frequency is related to the Performance mode frequency (8 kHz). Either it’s the same, a multiple of it, or evenly divides it. Another possibility is that the pack switching was interfering with the shunt signal. <\/p>\n","protected":false},"excerpt":{"rendered":"

I’m using a Xantrex LinkPRO as my only EV-specific instrumentation. I have a interface box that a friend built. The interface box scales the pack voltage down and also isolates the RS-232 output from the LinkPRO. I have a Deltec … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-56","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.ejetta.com\/index.php?rest_route=\/wp\/v2\/posts\/56","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.ejetta.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.ejetta.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.ejetta.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.ejetta.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=56"}],"version-history":[{"count":0,"href":"http:\/\/www.ejetta.com\/index.php?rest_route=\/wp\/v2\/posts\/56\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.ejetta.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=56"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.ejetta.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=56"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.ejetta.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=56"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}