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State estimation techniques estimate the actual possible state of the grid based on limited dataset. Whiletransmission system state estimation is a widelyused tool in industry, various barriers of distributionsystem state estimation (DSSE) implementation (e.g.spatial complexity of the network) hinders widespread rollout of the technology. This paper introduces the theoretical basics and main issues of stateestimation implementation especially the difficultiesof optimal meter placement techniques.

Nowadays, in electricity generation, renewable energy sources tend to play a more and more significant role. From these entities photovoltaic (PV) systems have the most noticeable penetration in Hungary. During operation both on the module- and onthe inverter side degradation appears, which has adecreasing impact on electricity production. In thispaper temporal changes of system lifetime weremodelled by a linear degradation model specified toHungary. Moreover, a maintenance case study of apower plant with 498 kVA output power is presented.In context of return an optimal maintenance scheduleis presented. Regarding the implied investment financial return was determined, based on the exchange rate of electricity. Finally, this paper concludes that in case of inverters the replacement is refunded during their life cycle but not profitable forphotovoltaic modules. &nbsp