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The Curtis 1238 has a built in precharge function provided you have it enabled in software. You don't need 2 precharge systems, just one and I don't see any reason to not use the one Curtis has built into the controller.

The older Curtis 1221 and 1231 controllers did not have a built in precharge function and such a system should be provided. When I was running a Curtis 1221B controller I used a standard E26 household light socket with a low wattage build, in my case a 7.5 watt red group bulb. That kept the controller charged within a few volts of pack voltage. Now I'm running a Zilla controller which has the precharge function built into it, the previous precharge system has been completely removed.
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