# Aquastar 10S 620k in 12S... Which ESC survived? **URL:** https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571 **Category:** Electronics (ESC, remote, batteries) **Created:** [May 26, 2019, 2:10pm UTC](https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571 "2019-05-26T14:10:41Z") **Posts on this page:** 5 **Page:** 1
### Author: ![philgib](https://foil.zone/letter_avatar_proxy/v4/letter/p/f17d59/32.png) [@philgib](https://foil.zone/u/philgib) #### Post date: [May 26, 2019, 2:10pm UTC](https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571/1 "2019-05-26T14:10:41Z")
Hello guys, So we are about to put the 620kv 10s Aquastar in the water for the first time, along with the reusenauer 6:1 and the Yamaha 7 1/4 prop… At 12S… According to specs, motor is 10S max but a few of you already tried at 12S with success 3000 watts max divided by 48v is about 63 Amps max. Would the 120A Yep hold WITHOUT water cooling ? Thx ---
### Author: ![Riwi](https://foil.zone/user_avatar/foil.zone/riwi/32/20684_2.png) [@Riwi](https://foil.zone/u/Riwi) #### Post date: [May 26, 2019, 2:17pm UTC](https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571/2 "2019-05-26T14:17:19Z")
Hi! I would not recommend running the yep without water cooling, it has close to zero heat sinks. ---
### Author: ![Silvio](https://foil.zone/letter_avatar_proxy/v4/letter/s/cdc98d/32.png) [@Silvio](https://foil.zone/u/Silvio) #### Post date: [May 26, 2019, 4:22pm UTC](https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571/3 "2019-05-26T16:22:16Z")
I confirme. Mine was OK without a duct but has burnt the first time I put a duct around my prop, after 10 min of ride. Now I bought the ZTW Gecko 150A, which is approximatively the same price but seems to have better heat seak. Not yet tried… ---
### Author: ![Jezza](https://foil.zone/letter_avatar_proxy/v4/letter/j/dfb087/32.png) [@Jezza](https://foil.zone/u/Jezza) #### Post date: [May 26, 2019, 4:54pm UTC](https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571/4 "2019-05-26T16:54:10Z")
I’m interested to see how this ESC performs… ---
### Author: ![PowerGlider](https://foil.zone/user_avatar/foil.zone/powerglider/32/3670_2.png) [@PowerGlider](https://foil.zone/u/PowerGlider) #### Post date: [May 27, 2019, 6:03pm UTC](https://foil.zone/t/aquastar-10s-620k-in-12s-which-esc-survived/4571/5 "2019-05-27T18:03:59Z")
My YEP HV 120A died within minutes without water cooling some years ago. The problem with water cooling YEP is that there is a junction to battery minus. If you get a second leakage at the motor you can have the full voltage through the water and you feel it very bad when you are swimming besides your board. So i made a closed loop water cooling with some hoses wrapped around the battery box. This helped. Also have a close look on the wires soldering, one motor lead disconnected after short time of use.