Battery / ESC combinations - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-21-2012, 05:50 PM   #1
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Battery / ESC combinations

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What reprocussions occer when using batteries not matched with the ESC's current? Can I use a 60c continous battery with a 30c ESC? What about using a 20c battery with a 30c ESC?
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Old 06-21-2012, 06:21 PM   #2
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Re: Battery / ESC combinations

Your listed ratings are a bit skewed. With a LiPo the C rating denotes how much current it can flow and that is based on the total battery capacity. With the ESC there is no C rating. It is expressed in a direct current flow capacity, normally with what it can handle full time and in some cases it will have a "Burst" rating on what you can push it to for a few seconds.

You have to look at the power system components together and separately.

What that means is the total performance will be limited by the least capable component in the power system. If your motor can draw 50A and the ESC is only rated for 30A you can easily damage it try to push it beyond it's capabilities. It may flow more than 30A, but not for long.

However, if the battery can only supply 25A max then that will be the most your system will flow, regardless of demand at the motor end.

One thing that I work towards in all my builds is reliability. That means I overbuild. In the electrical trade we try to rate the components at 1.5X the max expected draw, so if I calculate a max draw of 30A I will install an ESC of 40A or slightly more.

You never want to push any of the components to their max and that includes the battery. An easy way to tell if that is the case is at the end of a flight the battery, ESC or motor will be too hot to touch comfortably. If you push a LiPo too hard you can damage it and frequently the internal heating will cause the cells to balloon. Not good.

It may help if we knew what your requirements are, such as what craft you intend to run. In many cases the work will already have been done and there can be recommendations as to the best component choices.
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