最合適的是3.5A/平方毫米,取5A 或6A也不是不可以就是壓降大點(diǎn).

推挽逆變初級功率=銅線充許電流×2×電池電壓         次級輸出功率=充許電流×電壓      次級輸出功率必須小于或等于初級功率   例如：額定功率為500W的12V方波逆變器實(shí)際功率為300W，標(biāo)準(zhǔn)用線法是初級2.2毫米13A*2*12=312W,次級0.72毫米1.4*220=308W

標(biāo)稱線徑(毫米)        截面積(平方毫米)      充許電流A     每厘米最多匝數(shù)

 0.1                                0.007854                   0.027489          83

0.2                                   0.03142                  0.10997              44

0.31                                0.07548                  0.26418               28

0.41                                 0.132                     0.462                  22

0.51                               0.2043                      0.71505              18

0.62                                0.3019                    1.05665                15

0.72                               0.4072                      1.4253                 12

0.8                                0.5027                       1.75945               11

0.9                               0.6362                        2.2267                 10

1.0                               0.7854                        2.7489                   9

1.2                                 1.131                        3.9585                   7

1.5                              1.767                            6.1845                  6

1.81                             2.753                            9.6355                  5

2.02                             3.205                          11.2175                 4

2.44                            4.676                            16.366                 3

3.0                              7.068375                      24.739                 3