• Ray Whyte
    32
    If you don't use a vehicle very much or it's an RV that sits, your batteries will deteriorate much faster than a vehicle in constant use. A simple battery tender plugged in when not in use can help extend the life of your batteries, and you will always come back to the vehicle that is ready to start. Battery tenders are available for varying prices at any auto supply or big box store.
  • Nitehawk
    3
    What about if you have Lithium Batteries
  • Jake Gier
    5
    Here's a record of mine just sitting with no charging applied. They are Lithium Iron Magnesium Phosphate.
    Measurements provided by my BMV-712 and Fluke-87
    11-29-19 = 14.49 volts just topped off and resting.
    11-30-19 = 14.25
    12-01-19 = 14.07
    12-02-19 = 13.93
    12-03-19 = 13.83
    12-04-19 = 13.76
    12-05-19 = 13.71
    12-06-19 = 13.67
    12-07-19 = 13.64
    12-08-19 = 13.61
    12-09-19 = 13.59
    12-10-19 = 13.57
    12-11-19 = 13.56
    12-12-19 = 13.55
    12-13-19 = 13.54
    12-14-19 = 13.53
    12-15-19 = 13.52
    12-16-19 = 13.51
    12-17-19 = 13.50
    12-18-19 = 13.49
    12-19-19 = 13.48
    12-20-19 = 13.48
    12-21-19 = 13.47
    12-22-19 = 13.46
    12-23-19 = 13.46
    12-24-19 = 13.45
    12-25-19 = 13.44
    12-26-19 = 13.44
    12-27-19 = 13.43
    12-28-19 = 13.42
    12-29-19 = 13.42
    12-30-19 = 13.42
    12-31-19 = 13.42
    01-01-20 = 13.41
    01-02-20 = 13.41
    01-03-20 = 13.41
    01-04-20 = 13.40
    01-05-20 = 13.40
    01-06-20 = 13.40
    01-07-20 = 13.40
    01-08-20 = 13.39
    01-09-20 = 13.39
    01-10-20 = 13.39
    01-11-20 = 13.39
    01-12-20 = 13.39
    01-13-20 = 13.38
    01-14-20 = 13.38
    01-15-20 = 13.38
    01-16-20 = 13.38
    01-17-20 = 13.38
    01-18-20 = 13.38
    01-19-20 = 13.37
    01-20-20 = 13.37
    01-21-20 = 13.37
    01-22-20 = 13.37
    01-23-20 = 13.37
    01-24-20 = 13.37
    01-25-20 = 13.37
    01-26-20 = 13.37
    01-27-20 = 13.37
    01-28-20 = 13.37
    01-29-20 = 13.37
    01-30-20 = 13.37
    01-31-20 = 13.37
    02-01-20 = 13.365

    Battery manufacturer says nominal voltage of these batteries is 12.8 volts. So when I hit 12.8 volts I'll top them off again. But based on the data I have gathered that might be mid March or so.
  • Nitehawk
    3
    Great info.. I am in the process of going lithium so this will help a lot... I will watch them closer in the winter month while in storage seeing as we can hit -20 C here. Might even bring them indoors
  • Jake Gier
    5
    Mine can be stored at -40 c to 50 c. Just don't charge them below 0 c. Bring them in and let them warm up to 10 c or above before you try to charge. Mine is the U27-12XP 138 AH. I have three of them in parallel for a total of 414 AH.
  • Ed Camping
    5
    Jake I have two of the Valance U27 12XP 138AH. I brought mine in for the winter to my basement at home. The voltage was 13.36 when I moved them indoors in September and now that are at 13.32. In March I will put them back into the 5th wheel and charge them with the solar. I Leave them connected (both the 12 volt terminals and the BMS interconnects) together to keep the batteries balanced. I have 460 watts of solar on the roof.
  • Vance
    7
    Any opinions on Lithium ion batteries? Different type, safety concerns, life span, cost??? Any experience with a particular brand?? Thanks!!! Trying to get decide if 6 volt golf cart batteries would be a good replacement or lithium ions for an upgrade?
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