Grid Tied Solar Power Systems with Battery Backup

Grid Tied Solar Power Systems with Battery Backup: Outage-Proof Sizing

A grid tied solar system with battery backup does two jobs the plain grid-tie array cannot: it keeps the house running when the utility fails, and it stores midday solar for the evening instead of exporting it for pennies. The hybrid inverter watches the grid, switches to battery within milliseconds when it drops, and recharges from the panels the next morning. This category is for homeowners whose main worry is outages, from a few hours of storms to a week of ice.

The collection holds 32 grid tie systems with battery backup from EG4, Sungold Power, Rich Solar, BigBattery and Anker. Prices start from $2,900 for the plug-in Anker SOLIX F3000 with 6,144Wh of storage and reach $26,415 for the three-phase EG4 PowerPro 36kW with 85.8kWh of battery. Most whole-home installs land between $7,000 and $15,000 before panels.

Budgeting a mid-size system? See what an 8kW solar system costs with and without batteries - equipment prices for grid-tied and off-grid builds, and what the battery adds.

Pricing solar after the tax credit? Our guide to the federal solar tax credit in 2026 shows what ended, what still exists and how DIY kit costs compare with installed quotes.

How to choose a backup-ready hybrid system

• Outage length you plan for. Overnight backup of fridge, furnace, lights and internet uses 8 to 15kWh. The EG4 WallMount 16kWh + FlexBOSS21 covers that with 12.86kWh recommended usable. For two or three days without sun, the EG4 PowerPro 12kW 28.7kWh or the Rich Solar NOVA 10,000W Kit with 61.44kWh is the honest answer.
• Loads during backup. Central air, a well pump and an electric range at the same time want 10 to 12kW continuous. The FlexBOSS21 delivers up to 16kW with solar assisting; the NOVA 12K gives 10,000W; the 12000XP V2 in the PowerPro kits gives 12kW.
• Panels in the box or not. The Sungold Power 7.6kW Hybrid Kit with 15.36kWh and 12 x 500W Panels is complete; EG4, BigBattery and Rich Solar kits are inverter plus battery, so you size the array separately.
• Whole panel or critical loads. Inverters with 200A pass-through back up the entire service; otherwise plan a critical-loads sub-panel and decide now which circuits make the cut.
• Installed versus plug-in. The Anker SOLIX F3000 + 6,144Wh Extra Battery + 400W Panel needs no electrician and backs up a few circuits by extension cord; everything else here is a permitted install.

Popular picks in this collection

Sizing tips

• Run the Solar Kit Calculator with your appliances and ZIP code; it returns battery kWh, inverter watts and panel watts, and the battery figure is the one people most often undersize.
• Count winter sun, not summer. An outage in January refills far less of a 28.6kWh bank per day than one in July, which is why the larger PowerPro and NOVA kits exist.
• Give the battery a home above freezing. The EG4 280Ah All-Weather battery is IP65 with self-heating and can go outdoors; the 314Ah Indoor unit and ETHOS stacks cannot.
• If you own a generator, pick an on grid inverter with battery backup that has a generator port, so it can top up the bank during a long storm.
• Tell the utility. Any grid tie solar kit with battery backup that exports power needs an interconnection agreement, even if backup is your main goal.

Frequently asked questions

How fast does the switch to battery happen? Hybrid inverters like the EG4 6000XP switch in under 15ms, fast enough that computers and routers stay on. You will usually not notice the transfer.

Can I add battery backup to an existing grid-tied array? Often yes. A hybrid kit such as the EG4 WallMount + FlexBOSS21 accepts up to 21kW of PV across five strings, so existing panels can be rewired to it. An installer confirms compatibility with your current panels and any microinverters.

Is an off grid solar system with battery backup different? Only in the grid connection. The PowerPro kits are sold as off-grid systems but use the same batteries and inverter family; the hybrid units add utility export and charging.

Every system ships free to the mainland US from brand partner warehouses, usually within a few business days, with 30-day returns. Describe your last outage to us and we will size the battery so the next one is uneventful.