Hope you will all help out here. Our batteries and other stuff will be arriving on the 4th of January.
I'm going to describe the proposed battery pack/monitering system/charging system layout for the tractor and ask you for opinions.
Don't be afraid to lay it on me if you think somethin is a bad in the set up. I know in advance there are potential holes and problems. Some are irrellivant becaust this is a competition machine and will only run for 15 to 20 seconds at a time. Some I will live with because of cost andweight considerations.
I need to find any problems that I have missed in planning. LAY IT ON ME
Initially we will be using 150 38120P Batteries in a 50S/3P layout. Eventually we will be adding another layer if we find we need it and when we can afford it.
Each set of 3 batteries (four later) will be buddy paralleled (similar to what JACKBAUER is doing).
Each buddy pack of three will be monitored by a Cell Log 8M. Eight buddy packs of three batteries to each Cell Log. This should keep us pretty aware of condition of each buddy pack. If we see a odd or out of spec pack we can look for a dud battery. The cell log will also give us warning if we exceed a low voltage we will decide on when we are pulling.
Each buddy pack of three batteries will be charged by a DC/DC converter, 5 volt in and each converter adjusted to 3.65 volts out. The DC to DC Converter
s will be powered by a regulated 5 volt 350 +- 50 amp power supply. (I have found a number of these on ebay).
This way, no battery can be charged above 3.65 volts and if a buddy pack will not come up to spec. we can check the individual cells.
We never expect to do more then two consecutive runs within 15 to 20 minutes. The charger should restore the pack well enough between hooks.
20 inches wide x 6 inches thick x 50 inches long, about 100 pounds, a killer battery. 172 volts (3.45 voltsper cell) and 24ah nominal and up to 600 amps at I hope 2.6 to 3 volts per cell times 50 cells under load. Up to 90 kW. Oh Boy
Y'all be well and have a great New Year.