As Wolf10 says above, you will have no worry of ruining your batteries, from your Xantrex Freedom XC2000 inverter/charger. This will be true as long as you install properly. Change settings first to battery type and save, next go to custom battery type setting, change ah capacity to correct one, change to and set absorption at 14.3, set float at 13.3, set equalize to off, set to proper battery temperature cold setting, under 40 degrees, warm, 41 to 89, or hot setting, 90 and above, happy travels.
I prefer these conservative settings of Lifeline for all AGM batteries, even Oreillys East Penn AGM8Ds like I have.
You have 3 settings, cold, warm, and hot from the panel that comes on the XC2000. You will have completely adjustable voltage parameters with the XC2000 in addition to all the other features with smart 80 amp charger, built in ATS, load share, AC passthrough, etc. For example if you have the unit set for warm, 77 >degrees, 14.3 absorption charge and 13.3 float charge as Lifeline recommends for their AGMs, at 120 degrees (hot) correction will be approx 13.87 (down 0.043v from 14.3) and at 50 degrees (cold), correction will be approx 14.72 volts (up 0.042v from 14.3), Xantrex manual on page 48 says selecting cold from warm will change voltage charge up by 0.4 volts, selecting hot to cold, charge voltage, up 0.8 volts. See following chart from Lifeline manual. These Xantrex settings go along with Lifelines information in the chart below. Xantrex support confirmed today that at 40 degrees and below your setting should be cold, 41 to 89 degrees setting should be warm, 90 degrees and over setting should be hot, and you will not ruin your batteries. If the extremes are your constant norm (I would recommend moving, lol), just modify your absorption and float voltage setting up or down by the chart below to reflect these extremes.
From Lifeline manual.
Shared album - John Lewis - Google Photos
These are not set by dip switches, they are set by the remote panel that is available for $65.13 with 25' cable, or the panel on the unit itself by buttons. With an extention cable easily running to the interior, you will be able to adjust the settings from inside, with the following remote (or on the unit itself). So....yes, for less than $66 additional you will have your remote panel. For another approx $195, a great BMS in the Victron 712, with battery temperature and all the other information you will need monitor your batteries. Most all of us have a budget, so I understand that you may want to install the inverter by itself and do the $300 info panels next year, if your budget and plans dictate.
$65
Xantrex Freedom X/Xc Remote Panel W/25' Cable Amazon.com: Xantrex Freedom X/Xc Remote Panel W/25' Cable: Car Electronics
$646
Xantrex Freedom XC 2000 817-2080 Amazon.com: Xantrex Freedom XC 2000 817-2080 Power Inverter: Automotive
This short 3 min video covers the features pretty
thorough and fast.
https://youtu.be/h2Aqa7jqRfQ
If you want to know the temperature of your battery, this is easily available on your phone with the Victron 712 battery moniter system, for approx $195, again, I suggest this if you want to monitor battery temperature, ah in and out usage, state of charge, and you are interested in extending the life of your batteries. That is with budget and needs balanced.
$195
Victron BMV-712 Battery Monitor Amazon.com: Victron BMV-712 Battery Monitor: Electronics
Feature Settings in Configuration Mode
Audible Alarm  ï¢ïïŽ ï¢ïïŽ (Audible), ï‚ïï† (Mute) The alarm beeps once every five seconds. Battery Type  ï†ïŒï„ ï†ïŒï„ (Flooded), ïï‡ï (AGM), ï‡ï…ïŒ (Gel), ï•ï“ï… (Custom) ïŒï†ï (LiFePO4) The use of ïŒï†ï (LiFePO4) as a battery type requires a compatible BMS. See page vi for safety warning instructions. Battery Temperature  ïˆïï´ ïƒïŒï„ (Cold), ï–ï’ï (Warm), ïˆïï” (Hot) Selecting Cold from Warm will increase charger voltage by 0.4V. Selecting Cold from Hot will increase charger voltage by 0.8V. Custom Absorption Voltage  . . to . The voltage setting value can be adjusted by 0.1 increments. Available only when custom battery type is selected. Custom Float Voltage  . . to . Charger Current (Freedom XC 2000)    to  The current setting value can be adjusted by 5A increments. Charger Current (Freedom XC 1000)    to  Charger Ignition Control  ïï†ï† ïï†ï† (OFF), ïï” (Auto-ON) When set to ïï” (Auto-ON), the charger operates only in tandem with the vehicle's ignition circuit. Equalize Charging for Flooded Battery  ï„ï‰ï“ ï…ïŽï (enable), ï„ï‰ï“ (disable) This setting is only available when Flooded battery type is selected. It allows only one hour of equalize charging once. AC Input Breaker for Load Share    to  The load share feature prioritizes the AC load by reducing the charge current in order to maintain the total input current to less than the load share setting. Setting Name Setting Number Default Value Range of Values Description
Page 48 Freedom XC Owner's Guide
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