Repairs to South Africa’s coal-fired stations that have helped the State power utility avoid debilitating blackouts for three months straight is giving solar installers an unintended break. Until March, Eskom had inflicted power cuts for as many as 12 hours a day due to unreliable units prone to breakdowns. The outages have crimped the economy and inconvenienced residents who have burned candles, bought batteries and — for those who can afford it — put up solar panels.