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

Steve Higgins steve at surrette.com
Mon May 25 10:14:33 PDT 2015


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
M: +1.206.790.5840
F: +1.902.597.8447
Surrette Battery Company
Exclusive manufacturer of
[cid:rollsafb380]<http://www.rollsbattery.com>

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Ray Walters
Sent: Saturday, May 23, 2015 8:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] FLA battery setpoints with larger arrays

Having the LVD be temperature compensated so that the load is always disconnected above the freeze point of the battery would be a Huge Improvement on the whole concept of LVD.  In combination with State of Charge monitoring, like the Whiz bang Jr, would be the most effective, and just program the disconnect to stay above freezing for a typical lead acid battery.  I got this from a Trojan White Paper:
[cid:image001.jpg at 01D096D3.8E8C7560]


R.Ray Walters

CTO, Solarray, Inc

Nabcep Certified PV Installer,

Licensed Master Electrician

Solar Design Engineer

303 505-8760



FLA batteries will freeze easier if they are discharged.  I suppose that you could
use the battery temp sensor to make sure you charge them up good when
the temp gets cold enough.

boB


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