Runhood, based in California, is a new entrant to the off-grid and portable solar-plus-batteries market. What makes Runhood’s offering unique is its design built around external swappable batteries.

Chinese manufacturer Bslbatt has unveiled a modular lithium-ion battery that can be used for the off-grid storage of solar energy. The device has a storage capacity ranging from 5.1 to 30.7 kWh ...

(The US Department of Energy says solar batteries can cost anywhere from $12,000 to $22,000.) That said, it ultimately comes down to your budget and energy needs. A small off-grid solar system ...