Hello Bill,
I had no problem, when I was using them on my old battery boxes that was not
insulated at the time. The ones I have, have a maximum thermostat
temperature rating of 80 F. degrees.
Maybe the problem is, when the temperature is at 32 F or lower and the
batteries are at 80 F. and you have a fast rising ambient temperature, it
may raise the battery temperature above its safe operating temperature.
Or it could be that the thermostat sensor was not next to the batteries and
reading a cooler ambient temperature which keeps the heat blanket on all the
time, even when the battery temperature is at or above 80 F. degrees.
To prevent this from happening, I terminated the cord ends to a power
terminal block. The battery blanket thermostat was wrap with in the battery
box, so it only senses the temperature inside the battery box.
A AC 120 volt contactor with a 120 vac coil turn on and off all the power to
these blankets. A HoneyWell line volt 120 vac ambient air thermostat that
can be adjusted from 0 to 100 degrees control the 120 vac coils of these
contactors.
This HoneyWell thermostat has a sensor bulb that is place in side the
battery box with the control box outside the battery box. You can get these
units from a heating supply company.
Each battery blanket has its own thermo unit plus one main control thermo
for all the blankets. It is a safety back up, because sometimes these
blankets or tape type heaters thermostat may stop working causing the
blanket to be on all the time.
When I install new fiberglass double insulated battery boxes with 2 to 4
inches of foam, the batteries never drop below 65 F. Degrees after setting
outside. After I charge the batteries the battery and driving at least 5
miles, the battery temperature will raise between 75 to 80 F. degrees when
the ambient temperature is at 0 to 32 F. degrees.
In using this type of battery blanket, you have to determine what the
maximum temperature you want. I set it at 65 F. Degrees which allows some
room for the batteries to raise in temperature while charging and under load
unlike cranking type batteries which are only loaded during cranking the
engine.
Roland
----- Original Message -----
From: <
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To: <
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Sent: Monday, October 26, 2009 10:24 AM
Subject: [EVDL] KAT Battery Wrap
Roland,
I looked at the KAT battery wraps you mentioned, and they all have the
following warning:
Do Not Use if Temperature is Above Freezing
I'm assuming that you're using them inside your battery boxs even when
the temp. is above freezing. Is that correct? Can you give a little more
info?
Thanks.
Bill
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