1.How to choose the right model? A: It depends on continuous output power, Voltage, Frequency and fuel type. Please tell us what fuel diesel /(natural gas, biogas, biomass gas,wood syngas, methane,coal gas) or raw material(like wood, grass, nutshell and so on) The right model of generator will be recommend soon. 2. oil consumption and capacity per hour? A: 1.0-1.63g of lubricant oil consumption per hour. 1.0 Cubic meter gas can produce 1.5-3.0kw/h power. The capacity depends on gas energy(Kcal). E.g 1.0 Cubic meter natural gas produce about 3.0-4.0kw/h 3. overhaul? A: About 30000 working hours. A week is enough to finish. We offer manual for weekly, monthly and overhaul maintenance. 4. warranty? A: 1 year. within 1 year, spare parts free of charge. After 1year, spare parts charged. a set of spare parts will be shipped together with generator set . 5. after sale service and maintenance? A: We offer installation,repair and maintain service abroad. And online guide service if needed anytime. Our before-sale, in-sale and after-sale service are all trustable, you can name it.