Technical, Techniques, Hints, and Tips > DC Motors (Brushed) and Speed Controllers

Low battery cut out / ESC

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unbuiltnautilus:
If you can drop to 6v that will reduce the current draw significantly. Speed should still be good, although the chances are the model is a streamlined as a bathtub!
The only issue with a 6v source comes about if you are using solenoids to either drop the doors, or drop lines. These, if fitted, will probably be 12v units. If all your doors are servo activated then no problem.

hullmanhunter:

--- Quote from: unbuiltnautilus on April 03, 2018, 09:49:51 pm ---If you can drop to 6v that will reduce the current draw significantly. Speed should still be good, although the chances are the model is a streamlined as a bathtub!
The only issue with a 6v source comes about if you are using solenoids to either drop the doors, or drop lines. These, if fitted, will probably be 12v units. If all your doors are servo activated then no problem.

--- End quote ---


Thanks. That gives me another option.

hullmanhunter:
Yeah it' Defo  the motors! The battery was ok on the multimeter 12.6 V (not fully charged) when I revved up the motors it droppd to a scary 8.5V(briefly). I did nt need to check anything else.


I will have to order some new kit.


Thanks guys.
😀

Stavros:
Could well STILL be the batts......charge them up properly and retest also beg steal or borrow another batt tho check properly...what amps are the motors actually drawing




Dave

malcolmfrary:
The battery needs to be fully charged to stand up to the starting current of the two motors. 
Although the label on the battery says "12 volts", a reading of 12 and a bit when not loaded is not a good sign.  If the battery does not come up to at least 14 volts, there is something wrong with it.  A dud cell that can still pass some current could still give 12+ volts off the 5 remaining good cells until current is drawn, when the dud instantly reverse charges, dropping 4 volts (the two volts it wasn't giving, plus the two in opposition).
If the motors are driving props that are too big, both the starting current and the running current will be increased.  There are two answers to driving a big prop - either a gearbox or a larger motor.
SLA have never been the ideal choice for continuous heavy current delivery, but in the past their failings were passed over because there was no alternative unlike today.

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