光伏逆变器的温升不能使用常温叠加?

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广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

这个要看产品申请的环意温度，标准里是分大于50度和小于50度来进行，相关条款内容见如下：
+ c4 m3 D0 Y# P* X) T6 v6 x
CL 4.3.2.1 of IEC 62109-1:
Tests of equipment rated for use in ambient temperatures up to 50 °C may be conducted at
1 [% T: A1 j* I/ r3 kany ambient temperature in the range given in 4.2.2.1, in which case the difference between
2 k7 \% ?6 C# M- w( W, p) m6 ethe maximum rated ambient temperature and the actual test ambient is to be subtracted from
or added to (as appropriate) the measured temperatures for comparison to the limits specified
below.
  m* X! l8 o, Y7 s/ I1 B1 E# dPCE rated for use in ambient temperatures more than 50 °C shall be tested at the maximum
6 B7 f. y" ~) T, arated ambient temperature ± 5 °C. The difference between the maximum rated ambient
temperature and the test ambient is to be subtracted from or added to (as appropriate) the
measured temperatures for comparison to the limits specified below.

" [. y( A& w6 ]: `4 v( |. w不过就算是申请的环意温度小于50度也一般会放在环温箱里测试，或者有可控温升房也行，因为逆变器基本上在申请的最高温度（如50度）下进行温升测试时会出现降额，而如果不用环温箱采用直接测试后加上去后的结果会严酷的多，大多都会Fail。

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4.2.2.1 Environmental conditions
Unless otherwise specified in this standard, for example with regard to environmental
category as defined in 6.1, the following ambient environmental conditions shall exist in the test location:
a) temperature of 15 °C to 40 °C;
2 o6 V& I% s2 t/ Ab) a relative humidity of not more than 75 % and not less than 5 %;
. @1 _9 K5 \% G0 c/ ?1 C6 t5 Ac) an air pressure of 75 kPa to 106 kPa;
! t: Y4 G2 g: G+ I0 J$ ~9 {' Xd) no frost, dew, percolating water, rain, solar radiation, etc.