I also managed to get my DCDC converter and 12v accessory battery in and then back out
I purchased an el-cheapo Chennic DCDC converter. The instructions were not the clearest to say the least!. It has 2 HV+ inputs, one switched and one not - connected to the pack at all times. I couldnt see why it needed the always on connection so I wired it with the other supply staight into the contactor I am using to switch power to the converter. The idea behind this being It can then be disconnected and not become a parasitic load on the main pack. All appeared to be working perfectly.
The 12V battery is made from four Sinopoly 60AH (B) cells in series. These are clamped togethor using 3 pieces of flat bar, 1 angled bar and 4 lengths of treaded bar, the angled steel then bolts onto the component shelf.
Quite usefully, the RX8's original battery connector fits straight onto the Sinopoly cells.
The car stood for about 9 days with no input from me whatsoever (I had a busy week at work) on Friday night when I went to work on the car and found the 12v battery to be completely flat. All cells below 1v, one not even registering a voltage with my multimeter another at 0.02.
After some troubleshooting it turns out that the chennic DCDC converter (which was disconnected from the HV side) had a 1/2amp draw from the 12v battery. I can only assume it was because the 'always connected' HV+ was disconnected. Once reconnected the parasitic draw goes away. Odd.
I have managed to get all the cells back to 3.2v and holding a charge. shows that these sinopoly cells are quite robust.
I used the 3.3v Rail on a PC PSU to charge the cells. I couldnt get a single cell charger but this seems to have worked well.
Needless to say I have now wired my DCDC as per the instructions!
Over the Jubilee Bank holiday I want to get my vacuum pump mounted and installed and my emergency disconnect.
I also need to work out how to power the electric steering on the RX8. anybody got any ideas?