Does a motor mover really flatten the battery.

[GUMPY]

Just done a 5 minute move to get the van out of storage for its service it used 3% of battery capacity and drew a maximum of 50amps when first started.
Much less than I had been led to believe 🫣

 

[otherclive]

You’ve confirmed what Prof John/RogerL has been saying for years, is that movers don’t use much battery capacity for most times of use. Of course there will be exceptions for some owners depending on their particular needs.

 

[Andy Norfolk]

We had our caravan in storage for 3 months when we moved house. I was concerned the battery would be flat and the motor mover wouldn't work. When we went to get it the battery showed 30% and the mover worked fine.

 

[ProfJohnL]

Motor manufactures have to quote maximum current consumptions, so appliance designers can be sure to specify suitable motors for their products. The difficulty for electric motors is the maximum current a DC motor will draw is when it's stalled, or starting from stationary with no back EMF being generated. Most designers will ensure the motors torque will be able to driver the appliance, so it instant the motors shaft does start to turn, the back EMF ramps up and opposes the inrush current which diminishes as the shaft speed increases.

The reason most people need a reasonable sized leisure battery, is to ensure the battery has enough cold cranking amps to start a caravan mover where the wheels may need to climb a kerb. In general even a small car starter battery will have enough cold cranking amps for any mover, but the construction batteries is different and leisure batteries can stad being discharged for longer than conventional car batteries.

 

[Sam Vimes]

I'm not suprised.

I've mentioned before that when I had some trouble with my leisure battery I had to resort to taking the 70aH battery out of the car. It coped very well up a 25m gravel drive way which is 25% gradient in places.