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For a 5kVA MultiPlus-II model, your AC input should be protected by a fuse or magnetic circuit breaker rated at 50A or less.
The cable cross-section must be sized accordingly to handle this protection rating.
If your input AC supply has a lower rating, you should match the protection device to the lower value to prevent overcurrent situations.
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Protection Device Rating:
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The AC input of your 5 kVA MultiPlus-II should be protected by either a fuse or a magnetic circuit breaker.
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This protective device should be rated at 50A or lower. The choice of a 50A rating takes into account the maximum power that the inverter/charger can draw from the AC source.
Cable Cross-Section Sizing:
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The cables used for the AC input connection should have a cross-sectional area that’s adequate to handle the current corresponding to a 50A protection device.
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This ensures that the cables can carry the current without excessive heating or voltage drop, which is essential for safety and efficiency.
Matching with AC Supply Rating:
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If your input AC supply is rated lower than 50A, it’s important to match the rating of your protection device to the supply rating.
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For example, if your AC supply is rated at 30A, then a 30A fuse or breaker should be used. This is to ensure that the protection device trips appropriately in case of an overload, thereby preventing potential hazards.
Considerations for Inrush Currents:
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While the normal operating current might be lower than the breaker rating, the 50A rating provides a buffer for the inrush currents that can occur when the inverter/charger starts up or when large loads are switched on.
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