[RE-wrenches] FLA battery set points with larger arrays

Tue May 26 07:48:47 PDT 2015

There are many things that can affect that post temperature, so to get the overall temperature of the battery on the side of the battery tends to be more accurate.

When I take temp measurements on a flooded battery it’s primarily the electrolyte temp via the well.  If I suspect a shorted plate/cell I will do the side of the battery, if I suspect a loose connection I’ll check the posts, both pos and neg.  Most of the time just by checking the electrolyte well, you will detect most temperature problems with the temp of the electrolyte, but the electrolyte being made up mostly of water will also act as a heat sink, so it’s best to have a temp sensor attached to the side, about 1/3 below the top level of the plates.

A post temp sensor it just measuring the neg, or positive grouping, if there is an problem with the opposite grouping, or physically elsewhere in the battery the post sensor may not see the added heat while the side sensor will see the added heat within the electrolyte.

Some, not all of the post sensors can be mounted on the post or the side of the battery, Rolls likes the side mount better in general.   If you had a choice between a post mount sensor and no sensor at all I would choose the post mounted sensor as something is always better than nothing.

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of jay peltz
Sent: Monday, May 25, 2015 4:43 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] FLA battery set points with larger arrays

HI Steve,

Can you explain the difference between plate temperature and over all battery temperature?

What sort of temperature difference are you seeing?  IE post is hotter or cooler and by how much.

thanks
jay

On Mon, May 25, 2015 at 10:14 AM, Steve Higgins <steve at surrette.com<mailto:steve at surrette.com>> wrote:
Typically you want the BTS installed and any and every case…  The BTS should be installed below the level of the plates not on the top of the battery.   To do this you need to have the BTS about 1/3 to ½ the way down the side (Single Wall) of the battery, and I would suggest running some duct tape around the battery on the sensor to keep it on the side of the battery.

For a Double wall battery, Although the sensor will be close, it will get better readings in between the plastic walls.  To do so you can pull the top off the battery and put it between the walls.   There is usually some black silicone around the pos/neg terminals, all you need to do is replace that with regular old RTV silicone…

Post mounts are okay, but Surrette prefers the side mounts with another method of securing the sensors…  The post mounts only sense the plate temp, not the overall temp of the battery.

Temperature is a killer, and my years at Outback, and Trace I had no idea of how damaging this was until I came to work for Surrette.
For every 10 Degrees C above 25 you lose 50% of your life cycles… For example if you installed these in the Mojave desert where six month of the year they would reach 95F+ you would probably lose about 25-30% of your life cycles… One of the ways to combat this if you can is vault them…it’s a lot of work, but the earth even in those environments will keep them cooler.

Steve Higgins
Technical Services Manager
P: +1.902.597.4020<tel:%2B1.902.597.4020>
M: +1.206.790.5840<tel:%2B1.206.790.5840>
F: +1.902.597.8447<tel:%2B1.902.597.8447>
Surrette Battery Company

--
Jay Peltz
Peltz Power
jay.peltz at gmail.com<mailto:jay.peltz at gmail.com>

Steve Higgins
Technical Services Manager
P: +1.902.597.4020
M: +1.206.790.5840
F: +1.902.597.8447
Surrette Battery Company
Exclusive manufacturer of
[cid:rollsad3206]<http://www.rollsbattery.com>

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