Good Sam Club Open Roads Forum: Tech Issues: Battery Isolator - Parasitic Current
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 > Battery Isolator - Parasitic Current

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otrfun

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Joined: 09/08/2012

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Posted: 03/25/21 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

OP here. Purchased this $30 battery isolator on Amazon and installed it as part of our Renogy 40a dc2dc charger install. This BI appears to be the same unit that Keyline sells for $85.

This BI works great. Powers on the dc2dc charger when the alternator is active (>13.3v) and powers it off when it's not (<12.8v). According to the spec sheet, parasitic current is 10ma when the secondary batteries are off-line (relay open), 250ma on-line (relay closed). The resolution on my Amprobe clamp ammeter is a little sketchy at ma levels, but near as I can tell it's definitely under 20ma with the relay open. Also, this BI is only rated for "50a-70a continuous". They claim it has a 140a rating without acknowledging it's a "peak" rating---a bit misleading.

* This post was edited 03/25/21 07:49pm by otrfun *

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