as FlyForFun said, there's no need to run your client 24/7 unless you have coins ready for stake minting.

check your ppc fork PoS rules (STAKE_MIN_AGE and STAKE_MAX_AGE) :

If none of your coins are older than STAKE_MIN_AGE then you have nothing to mint.
If some of your coins are older than STAKE_MAX_AGE then they are ready for full pos minting.

To get "ready for minting", your coins must not move for STAKE_MIN_AGE seconds (30 days for PPC).

Hold them for a month (or 3 months for full pos minting) then keep your client running until you find a pos block.

If you want the client to automatically keep a given amount of coins ready for minting, while still using the currency, have a look at the 'reservebalance' option (RPC / cli)