Sorry, because of a business trip, I am delayed sending you an email. Because the most important control component of the 3KVA power supply is this motherboard, the price of the power supply is nearly the price of the motherboard. Therefore, the maintenance of the UPS with relatively smallcapacity is basically to replace it with a new power source. The FOB price of the motherboard: USD440 per piece. Discount price:USD40,839 per 100.