Once the SUN 22-60 goes into overvolt you really don't know how high the voltage will go. It depends on the turbine. Car PMAs can get to 100s of volts and thus can easily fry the dump FETs (don't do it!). The goal of the GTI dump port is NOT THE SAME AS IT IS FOR A BATTERY SYSTEM. For a GTI we want to slow the RPM ASAP so that the voltage drops and stays under 60V where the GTI can continue to feed the grid. We do not want the dump port to be active very long (just seconds). If it is on for longer, this indicates the load is not heavy enough. At 1000w and 60V the current is 16.6A. This equates to 3.6 ohms, which is clearly not low enough to slow down the turbine as it already went to overvolt. So what lower value is best? What we don't want is for the voltage to get anywhere near 100V, the limit on the IRF3710 dump FETs. I'd target 80V. 80V x 16.6A = 1333 watts. 1333w at 60V is 22.2A and equates to 2.7 ohms. That would be the highest ohm level I'd consider, but a lower value would even be better. The (2) IRF3710 FETs are rated at 57A and together could provide 114A of capability if properly cooled. The problem is, they are poorly cooled. When not activated, they share a heatsink with the normal MOSFETs so the heatsink surface is already hot when the dump FETs are activated. Also, it's not clear if the fan continues to operate while in dump mode (perhaps someone can address this). With poor cooling, it might be wise to not drive more that 15A through each FET, which would be about 25% of their rating, for a total of 30A for the pair. 30A at 60V suggests a 2.4 ohms of resistance and a dump power dissipation capability of at least 1500 watts. Using the WN green resistor line, we can get there with 8 resistors and have enough power dissipation capability. Placing 2 of the 24V and 2 of the 48V resistors all in parallel yeilds 1.13 ohms. Add another set like this in series then yields 2.26 ohms, very close to our 2.4 ohm goal. Each parallel set will dissipate 796 watts for a total of 1592 watts at 60V for the system. Adding 8 of these resistors can get pricey - perhaps a qty discount could be considerd, or a set matched and priced for a particular SUN GTI. As for the quartz crystal resistor version, perhaps 2 of the 5 ohm ones in parallel (2.5 ohm equivalent and 1800w capability) would be a good alternative. I'm a bit concerned about the wire gauge they use on these however.