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07-23-2009, 03:02 AM
| #1 |
| Pebble Pounder Join Date: Jul 2009 Location: Windsor, UK
Posts: 141
|  running lots off the esc
Yes, you'll all scream 'Castle external BEC' at me, but hold on :P I'm running a novak rooster crawler, which has a 6v, 5A bec on it. Stock tamiya 540 motor (CR01) and a couple of hitec 645MG servos. I reckon they'd run straight off the esc I also plan to run a winch and a set of lights. Now, both of these run via a Y-harness off the battery, so does that mean I don't need to factor them into the esc load? Also the lights will be a tiny draw, and the winch will most likely only ever be used on its own - not at the same time as the servos. so, should I be ok? |
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07-23-2009, 05:05 AM
| #2 | |
| Just jump it!   Join Date: Aug 2008 Location: Cedar City, Utah
Posts: 1,947
| Quote:
I was running a JR8711 servo off the rooster and never had any problems with the internal bec. It was when i added a full size servo for the dig when it finally started to act up! | |
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07-23-2009, 01:55 PM
| #3 |
| Rock Crawler Join Date: Jul 2008 Location: Port Angeles
Posts: 656
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Yes it will work but.... I ran 2 645's off my rooster for awhile, dig and steering I was fine so long as neither servo bound up while the other was doing anything. As soon as the steering got bound up and I was using dig it put too much load on the internal bec. I'd strongly recomend an external bec, without it problems are just around the corner IMO. |
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07-23-2009, 02:09 PM
| #4 |
| Pebble Pounder Join Date: Jul 2009 Location: Windsor, UK
Posts: 141
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are they easy enough to install? With me needing to have two sets of y-harnesses for the lights/winch, plus maybe an external bec, its going to be a bowl of spaghetti in there as it is. Surprised there is that much leeway though - the rooster has a 5A bec which I'd have expected to be enough - why even bother putting a large bec on if its not enough for general usage? (645s are good but nothing special) edit: Whats the current draw of a stalled hitec 645MG? Can't seem to find anything other than the current draw with no load. Last edited by mrklaw; 07-23-2009 at 02:37 PM. |
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07-23-2009, 02:41 PM
| #5 | |
| Pebble Pounder Join Date: Jul 2009 Location: Windsor, UK
Posts: 141
| Quote:
what happens if it puts too much load? Does the esc fry, or do you just lose power elsewhere? If its the second one, then I can always back off to 2ws if I'm bound up I just find it odd that I can't easily find these BECs in the UK, nor many UK forums even mentioning them - yet here its almost a must have | |
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07-23-2009, 02:51 PM
| #6 | |
| Keep it real   Join Date: Jun 2006 Location: Yakima,WA
Posts: 6,532
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07-23-2009, 02:52 PM
| #7 |
| I wanna be Dave Join Date: Dec 2008 Location: Madrid, IA
Posts: 2,015
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on all my esc's that cant handle the load just shut down for a sec, but they dont have a 5A bec only like 1-2A edit- tanis beat me to it |
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07-23-2009, 04:29 PM
| #8 |
| Pebble Pounder Join Date: Jul 2009 Location: Windsor, UK
Posts: 141
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well I've ordered one - better to have it and not use it, than to need it and not have it. Plan to start building next weekend when everything's arrived. Looking at the wiring diagram I don't think it affects the lights/winch - they tag on the end, so it should be managable. Better safe than sorry too, right? |
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07-23-2009, 04:40 PM
| #9 |
| Rock Crawler Join Date: Jul 2008 Location: Port Angeles
Posts: 656
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Always better to plan for the worst than get stuck when it happens. You could wire the lights and winch to run off the bec as well so long as you're happy running them at the same voltage as your servos. |
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