The T-Rex 300x is sold without a power connector to the ESC (or at least some kits are sold without a connector). One of the first tasks of the new owner is to solder a power connector. What size to choose?
Initially I thought that it was better to install a XT30, because the 3s, 1300mAh, 30C LiPo battery officially sold for the T-Rex 300x has a XT30 connector. Logically, one should infer that official size for the power connector is XT30.
However, upon further investigation, I changed my mind. Maximum ratings of the XT30 connector are:
- 15A continuous current.
- 30A peak current (could not find how long can be the peaks)
The corresponding ratings of the ESC that comes with the 300x, the RCE-BL25A are:
- 25A continuous current.
And the corresponding ratings of the brushless motor that comes with the 300x, the 300MX, are:
- 24A continuous current.
- 36A peak current (peak duration of 5 seconds)
By comparison, I feel that the XT30 is a bit on the short side of the maximum current admitted by the ESC and the motor. I found out also other shortcomings of the XT30:
- Most 1300mAh, 3S, LiPo sold around have XT60 connectors. Actually, the official Align LiPo looks like the only battery of this size with XT30 connector.
- XT30 are also more difficult to find in my local shop.
That’s why, considering all of the above, I chose to go with XT60 connectors for my 300x