Reading a battery spec sheet

Battery chemistry (most commonly LFP — lithium iron phosphate — in home systems) affects cycle life, thermal stability, and typical warranty length. LFP systems generally carry longer warranties than older chemistries.

AC-coupled systems connect to your home's existing AC wiring and work with most existing solar installations with less rewiring. DC-coupled systems connect directly to solar panels before the inverter stage and can be more efficient when installed as part of a new solar system, at the cost of more installation complexity if retrofitting.

Round-trip efficiency measures how much energy you get back out of the battery relative to what you put in — a system quoting 90% round-trip efficiency loses about 10% of stored energy to conversion losses.

On every product page, we label each specification as verified, supplier-provided, estimated, or missing, so you know how much weight to put on a given number before you compare products.