Repair cost is 0 until CA, BB repair is around 2000. Ammo cost only a few credits except HH. Dont use normal HH if you are low on credits. Each bind costs 500 so you lose 2000-2500 on each salvo.
If you want to earn more credits, do more damage. The more damage you make, the more credits you get. Also if it is possible wait until the end of battle, this way you get more bonus credits.
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