EG4

EG4 Batteries, Inverters and Solar Kits: How to Choose

EG4 builds 48V hybrid inverters and LiFePO4 battery banks for homes, cabins and off-grid builds, and this collection covers all of it. EG4 batteries such as the 280Ah All-Weather unit are sold on their own, EG4 hybrid inverters run from 6,000W to a 16,000W FlexBOSS21, and the PowerPro kits pair an inverter with two, three or six batteries so nothing has to be matched by hand.

The collection holds 23 products from EG4 and BigBattery (BigBattery bundles its ETHOS batteries with EG4 18kPV inverters). Prices start from $1,499 for the EG4 6000XP inverter and reach about $26,415 for the three-inverter, six-battery PowerPro 36kW system. Most buyers land somewhere between a single inverter and a 12kW kit with 28.6kWh of storage.

How to choose an EG4 inverter or battery

• Continuous output. Count the loads that run at the same time. The EG4 6,000W Off-Grid Hybrid Inverter covers a cabin or a well-managed home and parallels up to 16 units later. The EG4 12kPV 8,000W Hybrid Inverter steps up to 8,000W in a NEMA 4X housing you can mount outdoors. A whole house with central air is FlexBOSS21 territory: 12,000W on its own, 16,000W with solar assisting.
• Grid-tied or off-grid. The 12kPV and FlexBOSS21 work tied to the utility, fully off-grid or in between. The 6000XP and the PowerPro kits are built as off-grid systems. Decide this first because it changes which permits and which inverter you need.
• Battery capacity and enclosure. The EG4 PowerPro 48V 14.3kWh 280Ah Battery is IP65 rated with self-heating, so it can live outside. The 314Ah Indoor WallMount (16kWh nominal, 12.86kWh recommended usable) belongs in a garage or utility room.
• Kit or components. If you want one order and closed-loop communication already sorted, an EG4 solar kit such as the PowerPro 12kW with two or three batteries is the shorter path. Buy components when you already own part of the system.

Popular picks in this collection

Sizing tips

• Start with the Solar Kit Calculator. Enter your appliances and ZIP code and it returns the battery, inverter and panel size before you compare EG4 models.
• Plan storage for at least one night plus a cloudy day. One 280Ah battery gives 14.3kWh; the PowerPro 12kW 43kWh kit with three batteries covers a home with electric cooking.
• Check solar input, not just output. The 6000XP accepts 8,000W of PV, the FlexBOSS21 21,000W across five strings. Buy the inverter for the array you will have in three years.
• Match battery communication to the inverter. The 280Ah All-Weather battery pairs with EG4 or BigBattery inverters in closed loop; do not assume a third-party inverter will talk to it.
• Outdoor mounting needs the right ratings. The 12kPV and FlexBOSS21 are NEMA 4X, the 280Ah battery IP65; the Indoor WallMount is not.
• Growing later is easier with an eg4 solar system that parallels. The 6000XP goes to 16 units; the FlexBOSS line adds GridBOSS for multi-inverter control.

Frequently asked questions

Do EG4 inverters need EG4 batteries? They work best with them. The PowerPro kits and the WallMount plus FlexBOSS21 package use closed-loop communication between battery and inverter, which is why they are sold as matched sets.

Can I add solar panels to a PowerPro kit? Yes. The kits ship as inverter plus batteries; panels are sold separately so you can size the array to your roof or ground mount. The 12kW kits accept up to 18kW of PV.

What is the warranty on EG4 gear? The 12kPV, FlexBOSS21 and 280Ah battery each carry a 10-year manufacturer warranty per the product listings; the battery is rated for 8,000 or more cycles.

Everything here ships free to the mainland US from brand partner warehouses, usually within a few business days, with 30-day returns. If you are unsure whether you need the 8,000W or 12,000W class, call us and we will size the system with you.