Iron Edison (ironedison.com), of Lakewood, Colorado, offers lithium-iron phosphate (LiFePO4) batteries in 12, 24, and 48 V configurations, making them compatible with standard battery-based inverters. Storage capacity ranges from 180 to 1,000 Ah. Pre-assembled with a battery management system and DC disconnect, they’re housed in a steel enclosure with a removable lid. These maintenance-free batteries are rated for 5,000 cycles (about 14 years) at 50% depth of discharge, and have a standard seven-year prorated warranty. Lithium-iron phosphate batteries are touted for their safety and stability, as they are not prone to thermal runaway that has been problematic for other lithium battery technologies.