Two seperate manufacturers disagree with you, and If you fail to follow their installation instructions and it doesn't work/gets damaged it will be on your own head.
They are not disagreeing with me they are incorrect and disagreeing with the ABYC and current US accepted safety standards.. On boats the temps sensors should be wired to a neg battery terminal. In a land based solar system that does not move and vibrate running to the + terminal is more acceptable. These inverters are installed in off grid nearly as much as marine.
Xantrex is one of the worst manufacturers for poorly written manuals. I have a full list of changes that need to be made to the manual of just one of their products. They have agreed these changes need to be made, in writing, (Marina head of technical support per 2010 correspondence) yet they do nothing.
Here's a manufacturer, Balmar, who actually has a clue..
Battery Temperature Sensor (MC-TS-B)
In addition to its ability to completely discontinue charging when a thermal runaway condition is detected at your battery, the regulator can also modify charging voltage to compensate for smaller changes in ambient battery
In addition to shutting down charging in a catastrophic over-temperature
condition, the regulator will send the Dash Lamp terminal to ground,
allowing the operator to identify a potential system problem if a dash
warning light or audible alarm are used in conjunction with the Dash Lamp
To install the Battery Temperature Sensor:
1.Attach the thermister lug to the battery's negative post
as shown in the
image at right. If the bank has multiple batteries connected in parallel,
mount the lug on the negative terminal closest to the center of the
battery bank. "
And another one. ProMariner:
"Remote Temperature Sensor Probe
Battery End (ring terminal) – Connect to the NEGATIVE terminal of the battery."
(the all caps on the word NEGATIVE were done by ProMariner in the manual not me..)
And another one, Sterling Power:
"Battery Temperature Sensor
Connect the sensor end to the negative stud terminal on one of the batteries you think will be in the hottest environment."
Some manufacturers do abide by current safety standards and do give proper instructions for wiring temp sensors...