F3800 doesn't charge by solar panel at time of delivery/first time setup. So also means I cantput to use expansion battery. Opened ticket to return but some how their 'return label' system not working so I cant ship back and they wont send replacement until label system working. Additionally the portable 400 watt solar panel have cheap snaps for the support tilt legs and the snaps broke on first time use. Cant set best angle for the panel if charging were working. So panels also need to be returned. Its been several days now and still waiting to be able to return. For me, Big $$ at risk and they don't have good support for their products.

Excellent product, easy to add to existing system

Great battery, integration with the power station is very easy and all well made. I love that you can build up to a capacity for your home or other application. Newest firmware charging behavior is great too. Just be aware of the weight when planning how you will use/store/move, as they don’t have wheels like the main power station.

Un-packed it and plugged it in, done. Cord provided. Doubled my backup capacity in an instant. Great clean look too. Love this system. Looking forward to future expansions.

We use the F3800 for a whole home backup. Without the addon battery it would last about 6 hours. Now it will power the house for 12 hours.