Unverified85% confidenceDecision RuleTime unknown
计量精度选1.0级即可满足家庭电费核算，误差≤±1%；若用于设备能耗测试对比或工业分析，需选0.5级（误差≤±0.5%）以上，否则功率差异被误差淹没
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85%
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Long-term
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Unverified计量精度按等级划分，1级表误差±1%、0.5S级误差±0.5%，家庭分项计量选1级足够，需精确监测分时电价或光伏并网结算建议选0.5S级90% similarUnverified测量精度等级看有功电能计量准确度，家用监测选1级（误差±1%）足够；若需用于分摊电费或商业结算，应选0.5级或符合IEC 62053认证的产品89% similarUnverified测量精度看等级标识：Class 1.0（±1%误差）适合家庭算电费；Class 0.5及以上用于设备能效评测。低价产品若不标精度等级，误差可能达±5%以上，长期累计电量偏差明显88% similarUnverified精度等级与价格的权衡：0.5S级比1级贵一倍以上，家庭用电监测选1级即可，误差在电费上的差异每月通常不足以覆盖差价88% similarUnverified数据采集精度选1级（±1%）足够家用计费参考，若用于光伏发电结算或分时电价套利分析需选0.5级（±0.5%）计量精度87% similar
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