• 12 volt distribution bo1
    Initial ring-main distribution box

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

  • The overlap with the 230v Mains: external is that they both take power from the inverter via a fuse box. There the fuse box feeds two internal circuits. The extension connection goes to the previously used three gang flying extension, now pretty much fixed to the wall and a 6A fuse that feeds a line to a) a junction box from where a cable goes through the wall to a 2 gang socket,

    Wooden 2 gang socket


    and to
    b) feed to another junction box to a 2 gang socket installed above the tool bench, and also
    c) feeds a third 2 gang socket in the corner of the computer desk.
    Cable running to 2gang socket at computer station

  • Have laid 13A cable to an external rubber housed 13A socket. This has a 13A plug in the toolroom which plugs into a 3 gang socket block which inturn plugs into the inverter.

    Rubber housed external socket

    External wiring from socket, with kinks to allow for expansion of wood and contraction of copper in winter. The entrance is through a 10mm piece of copper pipe.

    Internal part of mains cable. The 13A plug is fitted with a 5A fuse as the 23ov source, the Victron 12|1200 inverter can only supply (1200w ÷ 230v < 5.2A

    Flying lead that connects to inverter, via the white 3 gang socket block. This is a temporary arrangement.

    Inverter set on open aluminium shelf for cooling

  • I have labeled the two S6 145s A and B
    and the cells in each are respectively (neg to pos), (pos to neg) ~ 1,2,3

    Specific Gravity Readings

    May 12th just before sunset.
    A1 = 1.280 :: A2 = 1.275 :: A3 = 1.250 | B1 =1.280 :: B2 = 1.275 :: B3 = 1.260
    This was before charging and I broke the hydrometer when cleaning so couldn't check the SG during or after charging which aslo included an automatic equalisation.

    May 28th Mid afternoon when on float
    A1 = 1.290 :: A2 = 1.292 :: A3 = 1.292 | B1 =1.292 :: B2 = 1.292 :: B3 = 1.260

    The new Durite 472 has a thermometer for temp coefficients and although it was difficult to read it appears as though at least 6 points should be added, i.e. 1.290 becomes 1.296.

    I spoke to Scotty at Durite who said SG's should be within 1%, i.e. 1.290 &plusmin; .0129 (0.013) so a range of 1.277 to 1.303 or 0.26 max diff.

  • Yeap! have bought Rolls again, this time direct from Barden UK. They also supplied the Victron controller. I have bought 2 off Rolls S6 145 (250Ah @ 20Hr) and 1 off Rolls S12 27 (105Ah @ 20Hr)

    A major factor in choice is weight. I only want around 30Kg to lift. The previous HT 31 was 27.5Kg.
    The new S12 27, which is one size down from the S12 31 (Prev HT 31) weighs 24.5 kg and the S6 145 is 32Kg

    Details for S6 145



    Had to make temporary handles to move them ??




    Detail to see on battery specs :-: See Comment 1 for explanation of ADVANCED NAM


    Rolls S6 145 – 6V Series 4000 Battery < £193.49 : 3 Years Warranty

    Physical Specifications

    Weight: 32 kg ~ 70.5lbs | Length: 25.9 cm ~ 10.19″ | Width: 18.1 cm ~ 7.13″ | Height Inc. Term: 29 cm ~ 11.4″
    Volts: 6 | BCI: GC2H | Cells: 3 | Plates/Cell: 17
    Terminal Type DT
    Included Hardware S/S Hex Cap Screw, Nut, Lock & Flat Washer
    Size & Thread 5/16″-18 x 1-1/2″

    Electrical Specifications
    Cold Crank Amps (CCA) 0°F / -17°C 710 Marine Crank Amps (MCA) 32°F / 0°C 888 Reserve Capacity (RC @ 25A) 484 Minutes Reserve Capacity (RC @ 75A) 127 Minutes

    Charge Voltage Range 2.45-2.5 V/cell @ 25°C (77°F)
    (7.35 to 7.5 for 6v battery or 14.7 to 15 for two in series)
    Float Voltage 2.25 V/cell @ 25°C (77°F)
    (6.75 for 6v battery 13,5 for two in series)

    Recommended Charge Current Capacity (String) 30 A
    Maximum Charge Current (String) 50 A
    Self-Discharge Rate 5%-10% per month at 25°C (77°F)

    Hour Rate Capacity : AMP Hour : Current / AMPs
    @ 100 Hour Rate 320 AH 3.2 A | @ 72 Hour Rate 315 AH 4.38 A | @ 50 Hour Rate 298 AH 5.95 A
    @ 20 Hour Rate 250 AH 12.5 A | @ 15 Hour Rate 238 AH 15.83 A |@ 10 Hour Rate 220 AH 22 A
    @ 8 Hour Rate 215 AH 26.88 A | @ 5 Hour Rate 198 AH 39.5 A | @ 1 Hour Rate 100 AH 100 A

    Amphere hour capacity ratings based on specific gravity of 1.280.
    Reduce capacities 5% for specific gravity of 1.265 and 10% for 1.250.


  • To reduce voltage drop of 12v to the main cabin I an installing a 10mm2 ring-main, that is cable going in both directions around a room, from the fuse box, giving a sum of 20mm2 conductor for both negative and positive lines.

    1. I've bought the cable and 24 off 10mm x 6mm crimp terminals from
      Torberry Connectors at cost of £102.55 inc P&P
      The pink and grey surrounding the copper are the actual covering. The darker red and black is the transparent overlay, which you can see by the join.
      10mm twin flexible cable
      10mm twined flexible cable.

      I bought a Weller 40w soldering iron and although it can heat the crimps enough to melt solder it cools to quickly for the 10mm cable to settle in so i had to crimp too :(
      10|6 terminals
      10|6 crimp terminals
    2. As I am going to run spurs from the ring-main I am using stand-alone post terminals to which I can fix multiple wires each. I have bought 6 red and 6 black from 12voltplanet.co.uk, hence the 36 lugs mentioned above. I will make boxes to house the terminals as I progress. Cost £57.47 inc P&P
      6mm_studs
      6mm studded terminal posts
    3. I am also replacing the main cables from the MPPT to the batteries and from the batteries to the fuse box with 16mm2 cable and for which I will use 16|8 crimps for the battery connections (4 off) and 1 off 16|6 for the fuse box
    4. To mange the heavy cable I have bought a wire cutter (£33.23) and cable stripper (£20.50) from Farnell
      Bacho 10mm wire cutter and Knipex 7AWG Stripper
      Bacho 10mm wire cutter and Knipex 7AWG cable stripper

      Both arrived around midday 11th Nov but the Nipex stripper is all but useless.
    5. Have ordered 16|8 and 16|5 crimp terminals and 2 each of 15A and 30A fuses from 12voltplanet, pity I didn't get it together for one order (P&P etc.)
    6. Ordered 4m of red and 3m of black16mm2 from Batteries and Solar, Plymouth