300V pack for gas turbine hybrid
Posted: Thu Nov 24, 2011 8:36 pm
I'm looking for a better pack for this project:
http://www.jetpower.co.uk/gtcar_home.htm
The turbine has a 208v 3 phase 400Hz generator which defines the buss voltage at around 300V. To get the project up and running, two 24 x 4.5Ah strings of UPS batteries were used, but now their power and to some extent energy are quite limiting.
So I’m considering NiMH or Lithium. I have developed the motor and battery controls which fully protect the pack. Float voltage, minimum discharge voltage and both charge/discharge currents are all individually regulated.
Two strings of 240, 10AH NiMH appear to be an option and don’t require individual cell battery management, for example:
http://www.batteryspace.com/nimhrecharg ... te1pc.aspx
http://www.ebay.co.uk/itm/D-Rechargeabl ... 8915790344
I’m familiar with lithium polymer and have converted a small motor bike to electric using 200, 10Ah Li poly cells. I did my own analogue battery management for this with 10 series groups i.e. 30 – 42V system. For the MG, power looks to be more important than energy, so LiFePO4 types are perhaps the best option. Particularly if they can get away without battery management or a very simple system. For the MG we are looking at 100 cells in series so the amount of work to repeat the analogue system I did for my bike would be prohibitive. For example:
http://www.batteryspace.com/LiFePO4-401 ... screw.aspx
http://www.ev-power.eu/index.php?p=prod ... 20ah-promo
Anyone got any suggestions, for example a LiFeP04 system with management scale able to 100 cells for reasonable cost. Budget 2-3K.
http://www.jetpower.co.uk/gtcar_home.htm
The turbine has a 208v 3 phase 400Hz generator which defines the buss voltage at around 300V. To get the project up and running, two 24 x 4.5Ah strings of UPS batteries were used, but now their power and to some extent energy are quite limiting.
So I’m considering NiMH or Lithium. I have developed the motor and battery controls which fully protect the pack. Float voltage, minimum discharge voltage and both charge/discharge currents are all individually regulated.
Two strings of 240, 10AH NiMH appear to be an option and don’t require individual cell battery management, for example:
http://www.batteryspace.com/nimhrecharg ... te1pc.aspx
http://www.ebay.co.uk/itm/D-Rechargeabl ... 8915790344
I’m familiar with lithium polymer and have converted a small motor bike to electric using 200, 10Ah Li poly cells. I did my own analogue battery management for this with 10 series groups i.e. 30 – 42V system. For the MG, power looks to be more important than energy, so LiFePO4 types are perhaps the best option. Particularly if they can get away without battery management or a very simple system. For the MG we are looking at 100 cells in series so the amount of work to repeat the analogue system I did for my bike would be prohibitive. For example:
http://www.batteryspace.com/LiFePO4-401 ... screw.aspx
http://www.ev-power.eu/index.php?p=prod ... 20ah-promo
Anyone got any suggestions, for example a LiFeP04 system with management scale able to 100 cells for reasonable cost. Budget 2-3K.