Considering temp loss though air, I would think you'd want some sort of clamp to get the temp sensor as much as possible in physical contact with the case, right???
If the sensor is 1/4 inch above the case, the sensed temp could be off by maybe 10 degrees or more? And then would it really do any good? On a hot summer day in Texas, I'm guessing the ambient air temp (100+, and could be 120+F down in the boat??) would be a LOT hotter than the battery temp should normally get during charging on a cool winter day. You'd almost have to have a "ambient temp sensor" (not at the charger - since it's giving off heat too), AND a battery temp sensor (which I'd really want built into the case).
Question - how much do you alter charging as a function of temperature???
John
From: "'Capt. Mike' biankablog@verizon.net [electricboats]" <electricboats@yahoogroups.com>
To: ELECTRIC BOAT GROUP <electricboats@yahoogroups.com>
Sent: Monday, January 19, 2015 1:20 PM
Subject: Re: [Electric Boats] Re: Charging batteries in series?
John
Thanks for looking up info about the temp. Sensor. I have to look at my Dual Pro cable install but, I believe the sense cable sits right on top of the battery case of each battery. If not I will make sure they are. While not perfect it should get a general sense of each battery's temperature during charging.
Capt. Mike
Thanks for looking up info about the temp. Sensor. I have to look at my Dual Pro cable install but, I believe the sense cable sits right on top of the battery case of each battery. If not I will make sure they are. While not perfect it should get a general sense of each battery's temperature during charging.
Capt. Mike
Sent from on board BIANKA
http://biankablog.blogspot.com
http://biankablog.blogspot.com
From: "John Acord jcacord@gmail.com [electricboats]" <electricboats@yahoogroups.com>
Sender: electricboats@yahoogroups.com
Date: Mon, 19 Jan 2015 08:04:21 -0800
To: <electricboats@yahoogroups.com>
ReplyTo: electricboats@yahoogroups.com
Subject: [Electric Boats] Re: Charging batteries in series?
Capt Mike,
From the Dual Pro Manual:Each charge cable assembly is equipped with a temperature sensor located at the junction of each set of
ring terminals
To verify that I called their technical support. According to their tech rep the temperature sensor is indeed located where the two battery leads join, after the fuses. So this sensor is measuring ambient temperature, NOT battery temperature, which can be different. A set of batteries, in a boat, sitting down at water level, can be at significantly different temperature than ambient!
If I were using a Dual Pro I would try to get the sensor directly in contact with the battery terminal, probably using careful dissection technique to expose it from within the cable termination.
With today's electronics technology temperature compensation measured at the battery terminal is cheap and easy. I wonder why it is so rarely used.
Can anyone propose an argument, considering the physics of it, of why ambient temperature is a sufficient measurement?
John
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