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KiloVault™ - HLX Series
Lithium Iron Phosphate (LiFePO4)
Deep Cycle Solar Batteries

NEW at altE ! 
The KiloVault™ HLX series of solar lithium batteries was specifically designed and tested for the beating that serious hybrid and off-grid inverters and solar charge controllers can throw at it.  Compared to traditional deep cycle batteries, the HLX Series’ lithium battery technology will more efficiently store and deliver the renewable energy you have generated, with no maintenance on your part.


  • Flexible - Works in 12, 24 or 48V configurations
  • Gives You More - You can use the full battery's capacity, discharging it 100%
  • Long-life - Even after discharging it completely 2000 times, 80% of the capacity remains.
  • Maintenance Free - No watering required, or cleaning of hazardous chemicals
  • High Efficiency - Giving you up to 12% more use-able stored energy
  • Smart Investment - Lower cost per watt-hour/cycle and longer lifespan than lead batteries
  • Safer - No thermal run-away issues as with other lithium technologies
  • Heavy Duty - Takes up to 150A of continuous charging/discharging current, meeting the tough demands of serious inverters and chargers
  • 7.5 Year Limited Warranty (see DOCUMENTS tab)

  • *IMPORTANT NOTE - PLEASE READ:  Because of differences in their Battery Management Systems (BMS), V1 or V2 batteries should NOT be combined in the same battery bank with V3 versions, which includes the CHLX, without first talking to your sales rep.  If you need to expand your existing bank, depending on your configuration, we may be able to provide a solution.  Please give us a call!


    Specifications: 1200 HLX 1800 HLX 3600 HLX
    Rated Energy Capacity (Watt Hours) 1200 Wh 1800 Wh 3600 Wh
    DC Voltage Nominal 12.8V
    Nominal Amp-Hour Capacity 100 Ah 150 Ah 300 Ah
    Optimal Charger/Inverter Settings Bulk/Absorption: 14.0V recommended
    Float: 13.8V recommended
    Low Voltage Cut-Off: 12.0V
    Equalization: Disable. Do not use.
    (Battery will shut down into protection mode)
    Maximum Cut-Off Voltage 14.6 ±0.2V
    Minimum Cut-Off Voltage 11.5V
    Continuous Discharge Current 100A 150A
    Max Charge Current** 80A 150A
    (110A after 3000 Cycles)
    Max Discharge Current (Continuous) 100A 150A

    200A (30 Mins)

    Peak Discharge Current (<3 secs) 350A 500A
    Standard Charge Current 60A 100A
    Discharge Cut-Off Voltage 11.5V
    Operating Temperature*** Charging: 32 - 113°F (0 - 45°C)
    Discharging: -4 - 140°F (-20 – 60°C)
    Optimal Temperature 59 – 95°F (15 – 35°C)
    Low Temperature Protection Charge protection at 0°, release at 4°C
    Discharge protection at -20°C, release at -10°C
    Cycle Life 5000 (80% DoD); 2000 (100% DoD)
    Battery Management System Monitors and optimizes charge & discharge for each cell, provides overcharge, over discharge, temperature and short circuit protection
    Monitoring Wireless on-site detailed battery status monitoring (optional)
    Self-Discharge Rate ≤2% per month
    Maximum Configuration HLX - 4 parallel strings of 4 series batteries (16)
    CHLX - 4 batteries in parallel OR 4 batteries in series (4) - not both
    Max Time Between Charges 6 months
    (L X W X H)
    12.5in x 6.5in x 8.5in
    (9.2"H w/Terminal)
    19.1in x 6.7in x 9.4in
    (10.9"H w/Terminal)
    20.5in x 10.6in x 8.7in
    (9.75"H w/Terminal)
    Weight 27 lbs (30 lbs shipping) 41.7 lbs (45 lbs shipping) 84.4 lbs (103 lbs shipping)

    *NOTE: Charging rates below the battery's maximum capacity will extend battery life.  After 3000 cycles at 100% depth-of-discharge the battery's capacity will be approximately 75% of when it was new.

    **NOTE: altE strongly recommends staying within a temperature range 32 - 113°F (0 - 45°C) for both charging and discharging to prevent damage and extend battery life.

    ***NOTES for Cold Rated Batteries:

    • The internal heaters are: 1200 CHLX is 64W; 1800 CHLX is 96W; and 3600 CHLX is 192W.
    • Maximum of 4 batteries can be used in series or parallel, but NOT both.  The CHLX are programmed so that when they are in parallel or series, if one gets cold enough to start heating, all of the CHLX in series or parallel will start heating.  This is to prevent widely different power draws and states of charge in the battery bank when some are heating and cannot charge, while others are warm enough to charge.  As the communication between the CHLX happens through the power cables, if connected this way, this communication can not take place. 
    • In both batteries, the heater starts at an external temperature of 0°C (32°F).
    • Heating stops when the battery reaches an internal temperature of 10°C (50°F).  However, the battery will continue heating even after the battery reaches low temp protection release of 39°F (4°C).
    • Below an external temperature of -30°C (-22°F), the heat dissipation is too great to bring the battery up to temp.
    • When the batteries are on an AC charger, it takes about 2 hours to warm the battery from an internal temperature of -30°C (-22°F) to 10°C (50°F).
    • It will take about 1.5 hours to warm the battery from an internal temperature of -20°C (-4°F) to 10°C (50°F).
    • When the batteries are charging with solar, it might take a longer time, depending upon the charger output.
    • The ambient temperature range of the CHLX batteries (ie. absolute lowest to absolute highest) would be -22ºF to 113ºF.  It needs to be noted, that when the battery is at that extreme low temperature, the battery is operating only in the sense that it is working on heating itself.  It won't start discharging until the internal temperature reaches at least -4ºF and it won't start charging until the internal temperature reaches 32ºF.

    1)    Each battery must be individually charged to 14.0V before placing it into operation with other batteries. Otherwise, the batteries will independently hit ‘full’ or ‘empty’ and shut off before others in the same battery bank.

    2)    Equalization charge must be turned off in your solar charge controller or AC charger. If left on, the equalization charge will raise the voltage too high, damage the batteries and void the warranty.

    3)    Bulk/Absorption charge voltage should be set to no higher than 14.0V for a 12V system, 28.0V for 24V system, and 56.0V for a 48V system (and lower for high amp chargers). Going any higher risks one or more batteries automatically shutting off in a high voltage protection mode.

    4)    Similarly, the ‘Low Voltage Cut-Off’ on the inverter should be set for no lower than 12.0V, 24.0V and 48.0V for a 12V, 24V and 48V system, respectively. Going any lower risks one or more batteries automatically shutting off in a low voltage protection mode.

    5)    When turning on breakers to inverters, charge controllers, battery monitors, etc. connected to the batteries wait 45-60 seconds between powering up each device. The KiloVault’s battery management system has special circuitry to detect short circuits and protect itself. Many brands of inverters, charge controllers and battery monitors will present a very high but very brief surge that can be interpreted as a short. The KiloVault can handle one of these ‘shorts’ every 45-60 seconds.

    Alternatively, in most circumstances all devices can be powered up at once but the batteries will go into auto-protect mode and turn off for 30-60 seconds but then restart normally.

    6)    Be sure to tighten the battery terminals before operating. Failure to do so will lead to the terminals overheating, melting the case and potentially cause a fire.

    7)  VERY important to unbox batteries and give them a full charge as soon as you get them, even if you're not going to commission them right away.  

    altE Tips and FAQ - KiloVault Battery:

    Is it good to insulate the KiloVault battery ? 
    It's the same with any type of battery. Because batteries heat up when they charge, if you insulate the box they are in, it will retain the heat better and the batteries will stay warmer. But make sure to remove the insulation in the hot months, as overheated batteries will have a shorter life.

    What is the best operating and storage temperature for the KiloVault? 
    The optimal temperature range overall is 59 – 95°F (15 – 35°C).  Full operating temperatures must be greater than 32°F (O°C) and less than 133°F (45°C). Charging the battery below 32°F (0°C) will potentially damage it. 

    What are the recommended charge controller/inverter settings?
    We highly recommend setting the Bulk/Absorb voltage to *14.0V* for a 12V system (*28.0V* for 24V system, *56.0V* for 48V), float voltage of 13.8V (27.6V for 24V, 55.2V for 48V). Higher settings will reduce the *life* of the batteries. For the inverter low voltage cut-off we strongly recommend 12.0V *or higher* (24.0V, for 24V systems, 48.0V for 48V systems). Limit the duration of the absorb voltage period to 2 minutes if the charger is more than 100A, otherwise set to 5 minutes.

    Are there any considerations when wiring the batteries in parallel? 
    Yes - for the HLX series batteries, the maximum configuration is 4 parallel strings of 4 series batteries (16).  In addition, when adding another parallel row of batteries to an existing one, it is important to maintain all parallel series strings within 0.2V of each other. Before adding a new row of batteries to an existing one, charge all batteries to 100% first. 
    For the CHLX series batteries, a maximum of 4 batteries can be used in series or parallel, but NOT both.  The CHLX are programmed so that when they are in parallel or series, if one gets cold enough to start heating, all of the CHLX in series or parallel will start heating.  This is to prevent widely different power draws and states of charge in the battery bank when some are heating and cannot charge, while others are warm enough to charge.  As the communication between the CHLX happens through the power cables, if connected this way, this communication can not take place.

    Can I mix and match models or brands?
    No - this is not good practice with any battery bank.

    Should I do an equalization charge on the batteries?
    No- much like AGM batteries, an equalization charge could damage them by overcharging them. 

    Are the batteries shipped fully charged, or do I need to charge them?

    No - shipping guidelines do not allow deep cycle batteries to be fully charged during shipment.  **Before you put the batteries into operation they must ALL be charged to exactly the same voltage (choose a voltage between 14.0-14.4,V but make sure they are *ALL* the same).  This will ensure you start with an even charge across the battery bank.  Suggested battery charger (cables not included with this charger but are available - use item code ALTCC-6AWG-60RB).  We do NOT suggest using the Iota IQ-LIFEPO Smart Charger accessory for use with KiloVault batteries because the charge voltage is too high.

    Can I do a constant trickle charge on the batteries?
    Storing the batteries with a constant small trickle charge is not recommended. Unlike lead-acid batteries, lithium iron phosphate batteries self-consumes energy at such a low rate (0.020 amps or about 6 Watt-hours/day), the battery can be easily over-charged if put on a trickle charger. Over-charging the battery triggers the over-charge protection - shutting it down until the voltage goes down enough by itself. Once that happens the trickle charger would quickly raise the voltage up too high once again. As a result, the constant cycling of this circuitry will shorten the life of the entire battery.

    Is it bad to overcharge or over-discharge the battery?
    Yes, this will decrease the life of the battery. It’s recommend to never discharge or charge the battery to the point where it has to shutdown to protect itself.

    Kilovault solar batteries

    Write a review

    Incredible Battery


    Upgraded my solar electrical system this year after 5 years on my smaller system. My intent was to never run my generator again. I have been running my new system with the KiloVault 3600 HLX for 2 weeks and it works fantastic. I've watched it put out 168 amps with no issue and only a couple t...
    Read the full review

    V2 mixed with V3 causing issues


    I have 16 batteries. 8 are V2 and 8 V3. When I got the V3 they said mixing them should be fine. However now the website says I can’t do that because the BMS’s are incompatible and I have noticed a wide range of state of charge between them. The V2 will charge and discharge much faster. V2 can be ...
    Read the full review

    Update on Incredible Battery


    I was not allowed to update my previous review until I created a new account.
    AltE did replace the original battery with the defective BMS. The replacement battery, a 3600 HLX V3, is a big disappointment. It will discharge as advertised, however, it does not charge as advertised and causes s...
    Read the full review

    Poor customer service


    Bought 2 new 12V HLX+ 300AH batteries. Within a month my inverter would randomly shut off like someone tripped a breaker. Batteries were charged fully and both match voltage and SOC. Changed out Inverter, cables, made sure settings were to spec. Told the batteries were not balanced. Bought a Kilo...
    Read the full review

    NH Off Grid Cabin Project

    With Alte's awesome support, we just finished installation of a 2KW system for a remote off grid cabin in New Hampshire's mountains. Everything is running great so far. Can't wait to see how the klv1800CHLX batteries work this winter.

    View all reviews (6)

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