Another wave of perovskite manufacturing announcements has developed, this time lead by a 20 GW factory announcement from GCL Systems Integration. We’ve gone a bit quiet in our coverage of perovskite manufacturing scale-up in the past year, because the production lines that do exist are only producing test batches anyway – but the latest tranche of announcements coming out of China is too large to be ignored. Last week there was a $700 million, 3 GW factory announced by Perovs, to be built by China Construction Second Engineering Bureau in the Jiangjin District of Chongqing, while GCL’s 20 GW announcement is from late September. GCL is already a silicon solar manufacturing giant, with its biggest assets being hundreds of thousands…