• From sciencedirect.com

    Irreversible Changes of Active Material Caused by Deep Discharge
    Deep discharge of batteries often leads to mechanical stresses in the plates, which leads to shedding, poor conductivity, and a diminished lifetime of the system. The active material utilization of a battery is therefore a trade-off against lifetime. Extensive volume changes and crystallographic structure changes during charge and discharge are the most common causes of mechanical stress in battery active materials. In addition, extreme voltages at the end of charge and discharge may initiate unwanted electrode reactions (such as corrosion) and other undesirable reactions (such as gas evolution).

  • An excellent source of info is https://www.sciencedirect.com/topics/engineering/deep-discharge
    The most common are lead acid batteries and lithium ion.

    In the lead acid range there are three common constructions
    1. Liquid Electrolyte: The common car battery
    2. Gell Electrolyte: Designed with the sulfuric acid in a gel form so it will nor spill
    3. AGM: Where the acid although still liquid is held in a glass matt. The advantage is that unlike the gel it is quicker to charge and can take a heavier load due to the mobility of the electrolye. It is permanenlty sealed and can be used in extremely mobile instances as can the gel.

    The above are also in order of expense.

    Lithium Ion there are many variations the most coom being LiFePo (Lithium Iron Pohosphate)

    The advantages are
    1. the charging rate can be variable as the cells do not need to be fully charged.
    2. They are very light weight an
    3. can be used in anu porientation.
    4. No sulfation.

    The disadvantages are
    1. initial cost
    2. They don't last longer than a well looked after lead acid.
    3. They are more environmentally difficult to recycle.

    Given the above although I had considered using an LIFePo even a poorly looked after lead acid may work out a) cheaper and b) more benign to recyle.

  • Morning Low ::12.63 | < 12.63 | < 12.39 | < 12.03    
    Yield :: 900 | 540 | 230 | 100 | 90
    Morning Low is the voltage before any use, maybe before sunrise :)
    Yield is the power used including the inverter. ~  I  Indicates Inverter Use (Fridge +)


    30th November : ML V=12.64   Y=70Wh
    29th November : ML V=12.67Y=490Wh    I 
    28th November : ML V=12.69Y=90Wh
    27th November : ML V=12.60Y=160Wh
    26th November : ML V=12.64Y=610Wh    I 
    25th November : ML V=12.56Y=220Wh
    24th November : ML V=12.56Y=100Wh
    23rd November : ML V=12.59Y=110Wh
    22nd November: ML V=12.63Y=80Wh
    21st November : ML V=12.57Y=50Wh
    20th November : ML V=12.54Y=40Wh
    19th November : ML V=12.51Y=260Wh
    18th November : ML V=12.53Y=70Wh
    17th November : ML V=12.59Y=20Wh
    16th November : ML V=12.67Y=110Wh
    15th November : ML V=12.51Y=190Wh
    14th November : ML V=12.69Y=10Wh
    13th November : ML V=12.63Y=330Wh
    12th November : ML V=12.51Y=230Wh
    11th November : ML V=12.67Y=30Wh
    10th November : ML V=12.51Y=250Wh
    9th November ::: ML V=12.59Y=60Wh
    8th November ::: ML V=12.67Y=90Wh
    7th November ::: ML V=12.67Y=140Wh
    6th November ::: ML V=12.61Y=530Wh    I 
    5th November ::: ML V=12.60Y=660Wh    I 
    4th November ::: ML V=12.60Y=340Wh    I 
    3rd November ::: ML V=12.67Y=170Wh
    2nd November :: ML V=12.54Y=240Wh
    1st November ::: ML V=12.67Y=50Wh

  • From the batteries 12 volts is fed to a mash-up via 16² (110A)

    12 volt distribution set up
    Mash-up for 12 volt distribution.
    The heavy cables are 1. from the battery and 2. through the wall to [dist-box1]

    The first port of call is a fuse box, from which currently there are three loads.

    The main load is the ring-main to the main room. This goes via 20A fuse to a small distribution box in the main room, from which it goes to another distribution box by the computer station.

    Nov 20th

    fttp gear supply12
    12volt supply to fttp gear is via the right switch with the green marker

  • Sadly the jaws on the Nipex do not meet and the bevel of the 'cutting' edge is so shallow that it is more like a crimper. Farnell are refunding me the cost and leaving me with the duff tool as it is not worth the returns cost etc.

    Knipex
    Knipex 7AWG cable stripper jaws

    Knipex 7AWG Stripper result
    Knipex 7AWG cable stripper effect on 6mm cable

  • 12 volt distribution bo1
    Initial ring-main distribution box

    12 volt distribution box for computer station
    Distribution box for computer workstation.