Electrics

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,

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.

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.

---

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

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.
   

   

   
   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 :(
   

   

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
   

   

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
   

   

   
   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