The portable home battery: DELTA Pro supports a 3.6kWh capacity that can be expanded all the way to 25kWh. The kicker? You can integrate it directly with your home circuits via the Smart Home Panel. Ideal for home backup. Power pretty much anything: DELTA Pro leads the industry when it comes to AC output. With 3600W you&';ve got a portable generator that can power heavy-duty appliances such as dryers, AC units & more. Need even more power? Pair two units together to hit a massive 7200W. Learn more about DELTA Pro >> Expandable capacity This add-on battery connects with a DELTA Pro to double total capacity to 7200Wh. Connect two of them to DELTA Pro for a staggering 10.8kWh to use off-grid. Convenient recharging Recharging from solar panels, AC outlets, EV charging stations, or our Smart Generator is easy. Plug the Extra Battery into DELTA Pro and they will recharge and discharge in tandem. Learn more about DELTA Pro Smart Extra Battery >>