Solo mining to exchange?

Hello. I tried my luck with solo mining and hit a block in about a day. I used the poloniex zec address to mine, using a local private pool. The transaction appears on the blockchain explorer, but it has not been credited to my poloniex account. I opened a ticket. Anyone tried to do this ? any technical reason why it wouldn't work?

I would appreciate a speedy reply from anyone knowledgeable.. I do not want to waste electricity in vain.