| I have a Skyline 30 (30 amp) speed controller, which is mfg by SJ | PRopo. According to the info sheets supplied with this controller it | has a low battery cutoff, and is suitable for an input voltage of 5 to | 10 cells (their phrasing, not mine).
And it's a pretty common phrasing. It refers to NiCd/NiMH cells.
| As I am thinking of using LiPo batteries - 2 or 3 cells - I need to know | whether this controller is suitable
Well, work out the voltages.
5 cells = 5
* 1.4 volts = 7 volts. 10 cells = 14 volts. 2 Lipo cells = 2 * 4.2 = 8.4 volts 3 Lipo cells = = 12.6 volts
Since 8.4 and 12.6 volts are both between 7 and 14 volts, this controller is sutiable.
| As I can see no way of changing the low batt cutoff I guess it must | somehow set itself by sensing the input voltage, but....
... however, the low voltage cutoff may not be appropriate.
If there's really no way of changing it, the odds are good that it's not changable (profound, huh?) and so it'll probably be fixed at 6 volts or so. Which is too low for 3 LiPos but ok for 2 LiPos.
I've found that the low voltage cutoff is not that important, even for my planes with Lipos. When you start getting down to 3 volts/cell, the power drops off _a lot_ (power is porportional to voltage squared, so at 4.2 volts you get almost twice the power that you do at three volts.) If you pay attention to your plane, and land when you start losing power, you're almost certain to land before you get the cells below 3 volts/cell which is the point where you start doing damage.
But sorry, I can't give you a definitive answer on the cutoff question.
| The LHS can't help, and the SJPropo site is in Japanese, but anyway I | couldn't find that model listed on their site - but perhaps it was, but | in Japanese.
Well, the email address on
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is snipped-for-privacy@prumail.co.kr ... so maybe it's actually Korean? Either way, I don't speak it. :)
Perhaps this URL will help --
http://216.239.39.104/translate_c?hl=en&u=
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though it's amazing just
_how_ bad the translation is. It looks like it's trying to be haiku or something :)
(Seriously, you should read the link, if only to see how bad the translation is!)