Section 429.39 - [Effective 12/23/2024] Battery chargers(a)Determination of represented value. Manufacturers must determine represented values, which include certified ratings, for each basic model of battery charger in accordance with the following sampling provisions. (1)Represented values include:(i) For all battery chargers other than uninterruptible power supplies (UPSs) tested under appendix Y to subpart B of part 430 of this chapter: The unit energy consumption (UEC) in kilowatt-hours per year (kWh/yr), battery discharge energy (Ebatt) in watt hours (Wh), 24-hour energy consumption (E24) in watt hours (Wh), maintenance mode power (Pm) in watts (W), standby mode power (Psb) in watts (W), off mode power (Poff) in watts (W), and duration of the charge and maintenance mode test (tcd) in hours (hrs);(ii) For all wired and fixed-location wireless battery chargers other than uninterruptible power supplies (UPSs) tested under appendix Y1 to subpart B of part 430 of this chapter: Battery discharge energy (Ebatt) in watt hours (Wh), active charge energy (Ea) in watt hours (Wh), maintenance mode power (Pm) in watts (W), no-battery mode power (Pnb) in watts (W), standby mode power (Psb) in watts (W), off mode power (Poff) in watts (W), and duration of the charge and maintenance mode test (tcd) in hours (hrs);(iii) For all open-placement wireless battery chargers other than uninterruptible power supplies (UPSs) tested under appendix Y1 to subpart B of part 430 of this chapter: no-battery mode power (Pnb) in watts (W);(iv) For UPSs: average load adjusted efficiency (Effavg).(2)Units to be tested.(i) The general requirements of § 429.11 are applicable to all battery chargers; and(ii) For each basic model of battery chargers other than UPSs tested under appendix Y to subpart B of part 430 of this chapter, a sample of sufficient size must be randomly selected and tested to ensure that the represented value of UEC is greater than or equal to the higher of: (A) The mean of the sample, where: View Image
and, x is the sample mean; n is the number of samples; and xi is the UEC of the ith sample; or,
(B) The upper 97.5-percent confidence limit (UCL) of the true mean divided by 1.05, where: View Image
and x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.975 is the t-statistic for a 97.5-percent one-tailed confidence interval with n-1 degrees of freedom (from appendix A of this subpart).
(iii) For each basic model of battery chargers other than UPSs tested under appendix Y to subpart B of part 430 of this chapter, using the sample from paragraph (a)(2)(ii) of this section, calculate the represented values of each metric (i.e., maintenance mode power (Pm), standby power (Psb), off mode power (Poff), battery discharge energy (Ebatt), 24-hour energy consumption (E24), and duration of the charge and maintenance mode test (tcd)), where the represented value of the metric is: View Image
and, x is the sample mean, n is the number of samples, and xi is the measured value of the ith sample for the metric.
(iv) For each basic model of UPSs, the represented value of Effavg must be calculated using one of the following two methods:(A) A sample of sufficient size must be randomly selected and tested to ensure that the represented value of Effavg is less than or equal to the lower of:(1) The mean of the sample, where: View Image
and, x is the sample mean; n is the number of samples; and xi is the Effavg of the ith sample; or,
(2) The lower 97.5-percent confidence limit (LCL) of the true mean divided by 0.95, where: View Image
and x is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.975 is the t-statistic for a 97.5-percent one-tailed confidence interval with n-1 degrees of freedom (from appendix A of this subpart).
(B) The represented value of Effavg is equal to the Effavg of the single unit tested.(v) For each basic model of battery chargers other than UPSs tested under appendix Y1 to subpart B of part 430 of this chapter, a sample of sufficient size must be randomly selected and tested to ensure that the represented value of Ea for all wired and fixed-location wireless chargers (or the represented value of Pnb for all open-placement wireless chargers) is greater than or equal to the higher of:(A) The mean of the sample, where: View Image
and, x - is the sample mean; n is the number of samples; and xi is the Ea (or Pnb, when applicable) of the i th sample; or,
(B) The upper 97.5-percent confidence limit (UCL) of the true mean divided by 1.05, where: View Image
and, x - is the sample mean; s is the sample standard deviation; n is the number of samples; and t0.975 is the Student's t-Distribution Values for a 97.5-percent one-tailed confidence interval with n-1 degrees of freedom (from appendix A to this subpart).
(vi) For each basic model of battery chargers other than UPSs tested under appendix Y1 to subpart B of part 430 of this chapter, using the sample from paragraph (a)(2)(v) of this section, calculate the applicable represented values of each metric (i.e., maintenance mode power (Pm), no-battery mode power (Pnb), standby power (Psb), off mode power (Poff), battery discharge energy (Ebatt), and duration of the charge and maintenance mode test (tcd)), where the represented value of the metric is: View Image
and, x - is the sample mean; n is the number of samples; and xi is the measured value of the i th sample for the metric.
(b)Certification reports.(1) The requirements of § 429.12 are applicable to all battery chargers.(2) Pursuant to § 429.12(b)(13) , when tested under appendix Y to subpart B of part 430 of this chapter, a certification report must include the following product-specific information for all battery chargers other than UPSs: The nameplate battery voltage of the test battery in volts (V), the nameplate battery charge capacity of the test battery in ampere-hours (Ah), and the nameplate battery energy capacity of the test battery in watt-hours (Wh). A certification report must also include the represented values, as determined in paragraph (a) of this section for the maintenance mode power (Pm), standby mode power (Psb), off mode power (Poff), battery discharge energy (Ebatt), 24-hour energy consumption (E24), duration of the charge and maintenance mode test (tcd), and unit energy consumption (UEC).(3) Pursuant to § 429.12(b)(13) , when tested under appendix Y to subpart B of part 430 of this chapter, a certification report must include the following product-specific information for all battery chargers other than UPSs: The manufacturer and model of the test battery, and the manufacturer and model, when applicable, of the external power supply. (4) Pursuant to § 429.12(b)(13) , a certification report must include the following product-specific information for all UPSs: Supported input dependency mode(s); active power in watts (W); apparent power in volt-amperes (VA); rated input and output voltages in volts (V); efficiencies at 25 percent, 50 percent, 75 percent and 100 percent of the reference test load; and average load adjusted efficiency of the lowest and highest input dependency modes.(5) Pursuant to § 429.12(b)(13) , when tested under appendix Y1 to subpart B of part 430 of this chapter, a certification report must include the following product-specific information for all wired and fixed-location wireless battery chargers other than UPSs: The manufacturer and model of the test battery, the manufacturer and model, when applicable, of the external power supply, the nameplate battery voltage of the test battery in volts (V), the nameplate battery charge capacity of the test battery in ampere-hours (Ah), and the nameplate battery energy capacity of the test battery in watt-hours (Wh). A certification report must also include the represented values, as determined in paragraph (a) of this section for the maintenance mode power (Pm), no-battery mode power (Pnb), standby mode power (Psb), off mode power (Poff), battery discharge energy (Ebatt), 24-hour energy consumption (E24), active charge energy (Ea), and duration of the charge and maintenance mode test (tcd).(6) Pursuant to § 429.12(b)(13) , when tested under appendix Y1 to subpart B of part 430 of this chapter, a certification report must include the following product-specific information for all open-placement wireless battery chargers other than UPSs: The manufacturer and model, when applicable, of the external power supply. A certification report must also include the represented values, as determined in paragraph (a) of this section for the no-battery mode power (Pnb). 81 FR 89821 , Dec. 12, 2016 81 FR 31840 , 5/20/2016; 81 FR 89821 , 1/11/2017; 89 FR 82063 , 12/23/2024