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Janis · 12-07-2009, 05:42 PM

Hello, have been out for some time, but I would like to talk about Voltage. For my ev conversion I will go up with voltage as much as possible for start 600V, it is because most what costs in AC is controller AMPS. I will simplify: Let's say we have motor 15kW 4pole 50Hz 230V 52A delta/400V 30A star, and battery pack of 25pc. AGM's 12V 20Ah or pack of 50pc. AGM's 12V 10Ah. The performance, range and weight does not change if we connect motor delta 230V 52A with battery pack 25pc. 12V 20Ah or connect motor star 400V 30A bat pack of 50pc. 12V 10Ah, but changes what, controller AMPS 400V is almost half of what needed for the same 230V , for 400V you can use less mm2 cables, you can use less amps contactors and You have, what is most signifcant, less losses. So 600V and up is preferable and don't forget that you don't need such big amps and Ah for your battery pack as in case with DC system.

12-07-2009, 05:42 PM	#132 (permalink)
Janis EcoModding Lurker Join Date: Jul 2009 Location: Latvia Posts: 16 Thanks: 0 Thanked 6 Times in 4 Posts	Voltage Hello, have been out for some time, but I would like to talk about Voltage. For my ev conversion I will go up with voltage as much as possible for start 600V, it is because most what costs in AC is controller AMPS. I will simplify: Let's say we have motor 15kW 4pole 50Hz 230V 52A delta/400V 30A star, and battery pack of 25pc. AGM's 12V 20Ah or pack of 50pc. AGM's 12V 10Ah. The performance, range and weight does not change if we connect motor delta 230V 52A with battery pack 25pc. 12V 20Ah or connect motor star 400V 30A bat pack of 50pc. 12V 10Ah, but changes what, controller AMPS 400V is almost half of what needed for the same 230V , for 400V you can use less mm2 cables, you can use less amps contactors and You have, what is most signifcant, less losses. So 600V and up is preferable and don't forget that you don't need such big amps and Ah for your battery pack as in case with DC system.