🔋Lithium iron phosphate cells are the most expensive component of a solar off-grid system
🏠The speaker is building an entire solar off-grid system for their house
🛠️DIY battery building is a cheaper alternative to purchasing pre-built batteries
🔬Used cells from old electric cars can be used to build batteries, but their lifespan may be shorter
💰Building a DIY battery costs approximately half the price of a pre-made battery