Generac Power Systems, which has a US wide reputation in the backup power market, with sales dominated by diesel generators, says it has bolstered its entry into the residential lithium ion battery market with changes to its PWRcell product line. Generac is a $2 billion business employing 6,500 staff and its new energy storage offering was acquired from a combination of Canadian firms Neurio bought in March last year focused on energy data and phone apps for metering use, which provides an app analogous to the Tesla app; and a set of solar integration tools from Solargraf, it bought last October and battery systems from Pika, a Portland based business, bought last April. The PWRcell product line was launched almost…