1. How is reward from hash calculated? I mining last 3 day. Avg h/s is 280 H/s (24h). I was expecting something around 0.0143, but I only have 0.0117 [20+-% less]. Why is it like that?
Previous post was written something about maitenens, but i don't thing this ist the reason. Can anyone explain it to me please? +How i can calculate result correctly?
(i know cca 300H/s is low, but i only testing before start something bigger)
This is because of variance. Some days the pool is more lucky in finding blocks, some days less. If we find less blocks (like the past 3 days for example), then of course your rewards will be less than expected. This all evens out over time. You can ask poolbot on the onsite chat (lower left corner) about these statistics. just type "/help" in chat to get started. It can show you the current effort, effort of last n blocks, total pool effort since block 1 etc... Our total average effort is dead on 100% currently. It was 99.2% last week, so we had a few bad days this week.
One of our community members created this Graph
http://poolburgers.000webhostapp.com/ which will give you an idea about variance. Check the past 7 days, which had a very similar average pool hashrate (~16MH), but the blocks per day range from 36 (ultra bad day) to 74 (ultra lucky day!)
2. Why has PPLNS better rewards? When block is found, it has 100% value. 100% value is divided between miners. How is possible the system PPLNS get more like 100% value in long time? It is always 100%. Now, after year, two ... So where is catch or from where it's stolen ?
You don't get better rewards with PPLNS. It's just the distribution is not in favor of pool hoppers who try to jump in shortly after block finds with high hashrates. PPLNS favors miners that are constantly mining.
3. I try find difference between payout (Wallet) and payout (Exchange), but unsuccessful. All go to my wallet, so what's the difference?
The difference is that exchange wallets differentiate the deposits of different people either using paymentIDs or integrated addresses, which require the pool payouts to happen in single transactions instead of bundling 20+ payouts together to save on fees. Your local wallet or mymonero wallet does not use paymentID or integrated address, so they can be bundled. Check the payments tab. It will be quite obvious what I mean.