Use 2.5 flat lines.
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For example, the charging current of 32AH lead acid is generally 3.5A, two groups are 7A, the maximum output power is 70V*7A = 490W\/0.8\/220V=2.78A, the maximum input current on 220V is about 3A, the national standard copper core wire 1.5 square meters is enough.
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Note: The longer the line, the thicker it is.
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As an example, if it is to extend the output line, 20 meters, positive and negative back and forth is 40 meters, it may need to use more than 2.5 square lines.
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It is better to increase the size when possible. The wire diameter is thick, and the whole is thick after the insulation skin is added, so that the rear tension is extended.
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Extended information:
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functional characteristics
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1, the charger has manual, automatic and short-circuit three state control, the use of more flexible operation.
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a) automatic state ---- The charger can automatically switch the working state according to the working condition of the internal combustion engine, and automatically complete the whole process of battery access (short-circuit state) and disconnected charging, without increasing the work intensity of the staff.
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b) manual state ---- Whether the generator is started or not, the charger can be forced to work in the charging state. This function facilitates the maintenance and maintenance of the battery during the maintenance and maintenance of the locomotive, without using other additional charging equipment. The battery can be charged and maintained by using the 110V external power supply line during maintenance and repair.
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c) short-circuit state ---- When the charger fails or does not need to work, isolate the charger and restore the original line of the locomotive. The normal working state of the locomotive can be guaranteed no matter what happens to the charger
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2, with LED voltage and current display, easy to monitor the working state of the charger.
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3, small size, easy to install.
Electric bicycle charging, you can use the kind of household socket, you do not need to find how big, because he charges, his charger is the kind of transformer, so 220 charging words, ordinary socket can be used, he does not have to use how much line, so you want to use what line with what, the kind of ordinary buy interject is completely OK.
Electric vehicles according to the size of the battery power, if it is home two rounds,1 square millimeter is enough, if it is three rounds,1.5 square millimeters is enough, if it is four rounds,2.5 square millimeters is enough.