• The Electric Control brings together the inputs from solar panels via terminal, where adjustments can be made, to charge controllers that feed the batteries. The main update for 2018 is the terminal blocks that allow the solar panels to be connected separately to two banks of batteries, and be connected in parallel or series and bypass the controllers to fed the batteries directly.

    control panel with MPPT

    To connect two panels a terminal block of eight is used. A terminal for the positive and negative of each panel, each of which is then connected to another terminal.

    1. The top of the block has the inputs. To the left, the larger black cables with blue and red tape to indicate polarity, and to the right a brown and blue mains electric style wires.
    2. The negative outputs are connected to the respective controllers and there is a blue wire that joins the negative of both solar panels and controllers.
    3. The positive outputs are the red wires going to the two double terminal blocks immediately below.

    The two blocks below take the positive output from the main block via the red wires. The outputs of each are wired to a) the input terminal of the controllers and b) to battery output of the controllers to bypass an feed directly to the batteries. The selection being done manually by moving the red input wires.

    Alternative arrangements for the solar inputs are:
    1. In parallel: Take the red output wire from one panel and connect it to the spare terminal at the bottom adjacent to and connected to the other output.
    2. In cloudy weather this gives increased output to be used with the controller or can be done to overcharge (equalise) batteries when the controller doesn't have that function.
    3. In series: Only used when the cloud cover is very low and the combined voltage is below 75v the maximum for the Victron 75 | 15

  • Run a 6mm copper bar via a terminal block from the inner wall to the outer. Have yet to connect the rod to the external earth.

    6mm rod held of from wall by paduk block.

    July 4th Have used old stiff 7 strand 3mm earth wire and connected MPPT, Battery and Inverter to earth block.

    Earthing of inverter, battery and MPPT. (Highlighted)

    July 11th I have finally soldered the internal earth rod to the external grounding strip, it is not pretty and I could have a) made a better job of it by protecting the wood and mains cable or b) made a nice copper clamp to join them ~ a future mini project.
    Connection is only soldered at rod end but soldered and bolted at strip end. Area has been tar-oiled.

    To see a better extent of the scorch marks view ~ Scorch Extent


  • Morning Low ::12.63 | < 12.63 | < 12.39 | < 12.03     Yield :: 900 | 540 | 230 | 100 | 90
    Morning Low is the voltage before any charge or use, if I'm up, else it is the lower value of max and min.
    Yield is the power used including power via the inverter. ~  I  Indicates Inverter Use (Fridge + +)


    30th June : ML V=12.82   Y=120Wh
    29th June : ML V=12.87Y=100Wh
    28th June : ML V=12.91Y=360Wh   I 
    27th June : ML V=12.71Y=170Wh   I 
    26th June : ML V=12.74Y=100Wh
    25th June : ML V=12.79Y=900Wh   I 
    24th June : ML V=12.87Y=910Wh   I 
    23rd June : ML V=12.78Y=830Wh   I 
    22nd June: ML V=12.68Y=100Wh
    21st June : ML V=12.71Y=110Wh
    20th June : ML V=12.82Y=500Wh   I 
    19th June : ML V=12.75Y=160Wh
    18th June : ML V=12.70Y=130Wh
    17th June : ML V=12.87Y=130Wh
    16th June : ML V=12.83Y=280Wh   I 
    15th June : ML V=12.83Y=770Wh   I  Checked electrolyte levels.
    14th June : ML V=12.79Y=110Wh   I 
    13th June : ML V=12.83Y=70Wh
    12th June : ML V=12.79Y=80Wh
    11th June : ML V=12.74Y=190Wh   I 
    10th June : ML V=12.83Y=90Wh
    9th June ::: ML V=12.75Y=150Wh   I 
    8th June ::: ML V=12.58Y=80Wh ML V=12.58 ???
    7th June ::: ML V=12.90Y=250Wh   I 
    6th June ::: ML V=12.75Y=320Wh   I 
    5th June ::: ML V=12.67Y=310Wh   I 
    4th June ::: ML V=12.74Y=340Wh   I 
    3rd June ::: ML V=12.75Y=220Wh
    2nd June :: ML V=12.79Y=950Wh   I 
    1st June ::: ML V=12.87Y=910Wh   I 

  • The three sizes I am interested in are: Data, prices and links as of June 2020

    2 x 4mm2 x 6mm2 x 10mm
    Rated Amps303951
    OD in mm9.611.814.5
    Loss mV/A/m127.84.6
    Cost £/m 2.413.414.33

    For more detail and other sizes see H07RN-F Data Sheet from ukcables.co.uk

  • Probably not a lot of noteable acitivity in the box, but it is the object of speculation. The lid being only 7" x 3" with a depth of some 3 and 3/8ths. It weights some 6lb 10oz (3Kg). The content seems to be a block that can move a little vertically but there is no detecteble movement, by hand, horizontally.

    uncanny steel box
    Sealed steel box

    The box has been sealed by what looks like solder and what would be important enough to seal from the air. Including the steel box that appears to be a maximum of 1/16" thick the density is (weight / volume) = 3Kg ÷ 1.14Lt = 2.63.

    The density is to hight for paper money or any sort of biological matter. Most metals have a higher density and why would a piece of metal be so contained?

    Well after some 32 years or more maybe it's time to open the bow, by grinding off the lid edges.

    uncanny steel box
    Sealed steel box item uncovered

    uncanny steel box
    Sealed steel box item removed

    uncanny steel box
    Sealed steel box item exposed

  • Morning Low ::12.63 | < 12.63 | < 12.39 | < 12.03     Yield :: 900 | 540 | 230 | 100 | 90

    Morning Low is the voltage before any charge or use, if I'm up, else it is the lower value of max and min.

    Yield is the power used including power via the inverter. ~  I  Indicates Inverter Use (Fridge + +)



    31st May : ML V=12.67   Y=970Wh   I 
    30th May : ML V=12.71Y=990Wh   I 
    29th May : ML V=12.71Y=1.02KWh   I 
    28th May : ML V=12.78Y=940Wh   I 
    27th May : ML V=12.74Y=900Wh   I 
    26th May : ML V=12.81Y=870Wh   I 
    25th May : ML V=12.70Y=710Wh   I 
    24th May : ML V=12.70Y=600Wh   I 
    23rd May : ML V=12.74Y=550Wh   I 
    22nd May: ML V=12.84Y=60Wh Low yield as the battery is near capacity and little daytime load.
    21st May : ML V=12.74Y=760Wh   I 
    20th May : ML V=12.74Y=750Wh   I 
    19th May : ML V=12.77Y=330Wh   I 
    18th May : ML V=12.71Y=820Wh   I 
    17th May : ML V=12.75Y=770Wh   I 
    16th May : ML V=12.76Y=370Wh   I 
    15th May : ML V=12.72Y=860Wh   I 
    14th May : ML V=12.78Y=810Wh   I 
    13th May : ML V=12.59Y=620Wh   I  Install invoked equalisation at 15.94v with a max 4.8A for 4 hours
    12th May The Rolls S12 27 specific gravity just before installation around sunset was:
    1: 1.260 | 2: 1.265 | 3: 1.250 | 4: 1.250 | 5: 1.245 | 6: 1.250



    Yield :: 610 | 600 | 450 | 320 | 190 | 90   P : Power Tools | F : Fridge


    12th May : ML V=12.59Y=960Wh  F
    Have swapped battery from Gavin's 41Ah to the new Rolls S12 27 so will be setting a new MPPT profile. 22Kw have been yeilded to the 41Ah since ???

    11th May : ML V=12.63Y=790Wh  F
    10th May : ML V=12.67Y=440Wh  F
    9th May ::: ML V=12.72Y=700Wh  F

    8th May ::: ML V=12.83Y=390Wh Inverter downgraded from Victron 1200w > SkyTronic 300w so no more power tool usage.  F

    7th May ::: ML V=12.59Y=590Wh   ML 12.59 ?? The only reason I can think of is that the battery only went to float very late as I had the inverter on all day. This means that the ABS/FLT settings do not readily bring it to 100%  P  F   Also controller was reset later in the day as I disconnected to remove the inverter.

    6th May ::: ML V=12.60Y=770Wh   ML 12.60 ??  F
    5th May ::: ML V=12.63Y=200Wh
    4th May ::: ML V=12.67Y=540Wh  F
    3rd May ::: ML V=12.67Y=200Wh
    2nd May :: ML V=12.74Y=500Wh  F
    1st May ::: ML V=12.63Y=290Wh