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can the SS45d ESC run on 5 cell lipo?

Old 10-01-2007, 08:48 PM
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cwharper
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Default can the SS45d ESC run on 5 cell lipo?

I have this ESC: [link=http://manuals.hobbico.com/gpm/gpmm1800-manual-v1_1.pdf]Electrifly SS45D[/link]

It came with my second electristar which I have run with 14 nimh cells all in series. That's 21 volts hot off the charger. A 5 cell lipo is also 21 volts hot off the charger and quickly fades below 20v with any load put on it. I'm not using the bec. Why couldn't I use my 5 cell lipo and this esc together if I didn't go over 500 watts?
Old 10-03-2007, 08:43 AM
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Matt Kirsch
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Default RE: can the SS45d ESC run on 5 cell lipo?

21V hot off the charger, but quickly down to around 18.5V at rest, and then down to 14V under load.

Even though the starting voltage of the 5S LiPoly is about the same, it stays there, and you can expect 17-18V under load unless you undersized your pack (an expensive mistake, as it won't last long).

I'm betting you're borderline now, and the additional voltage the 5S will bring to the party will push the ESC over the edge. BTDT trying to run a 4S pack on an ESC rated for 6-12 NiCD. Doesn't look all that far out of spec on paper, but it doesn't take long for the ESC to go into thermal shutdown. Thankfully the ESC was smart enough to protect itself.

Experience has taught me that a 4S LiPoly is a good equivalent to 14 NiCd cells. 5S is more appropriate in a 16-18 cell application.

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