> By the time you start adding batteries, you're unlikely to be net carbon negative during the system life. Batteries are around 100kg of CO2 per kWh of capaci

> By the time you start adding batteries, you're unlikely to be net carbon negative during the system life. Batteries are around 100kg of CO2 per kWh of capacity on a really dirty grid (China). So after the usual 2000 cycles a LiFePO4 battery can stand it will amount to around 50g of CO2 per kWh delivered (or 60g taking into account losses). Solar panels are 45-80g per kWh so worst case scenario you're doubling the system's footprint if you're going for 1 hour of full capacity.