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Hitec X4 AC/DC Discharge
I have a Hitec X4 AC/DC charger that according to the instruction book will discharge a LiFe battery at a rate of 1C. The problem is that when I try to change the discharge rate in the charger, it will not go higher than 1 amp. I have tried it with both an AC and a DC power source and neither one will go over 1 amp. Am I missing something here or is there an error in the instruction book?
TIA Fella's, David |
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so, not sure of your experience.......
1. On the X4 the max charge rate per port is 50 watts and generally speaking the discharge rate for chargers is less than the charging rate. 2. The X4 spec for discharge is a max of 1C discharge and this does NOT mean that it can always do a 1C discharge. (yes this seems strange however, some numbers have more meaning than other numbers) 3. Check out page 23 of the manual, it lists "discharger power" at 5 watts. 4. Watts are a product of volts and amps for example 1 amp at 12 volts = 1 x 12 = 12 or 1 amp at 12 volts = 12 watts. 5. Lets say one has a 2200 3 cell lipo fully charged, to be discharged. 2.2 amps X 12.6 volts (full charged non-hi volage lipo) = 2.2 amp hours X 12.6 volts = 27.72 watt hours. 27.72 watt hours / 5 watts (X4 discharge rate) = 5.544 hours required to TOTALLY discharge the battery (bad idea to totally discharge lipo batteries) so 70% of 27.72 = 17.304 and 17.304 / 5 = 3.46 hours to 70% discharge a 2200 3 cell lipo at 5 watts. When discharging a battery the "energy" has to go some where. With the X4 the energy is converted to heat and the maximum that the X4 is designed (specified) to handle is 5 watts. In this case the 5 watt maximum trumps the "max listed discharge" of 1C. Michael (if your not fryin, your not tryin!) |
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