Residential backup storage is usually bought for a simple reason: the homeowner wants lights, WiFi, refrigeration and a few essential circuits to stay alive when the grid is unstable. The technical work is deciding how much backup is enough and which inverter/battery combination will behave predictably after installation.
For RFQs, the useful starting point is not only kWh. Phase type, battery voltage, backup circuit size, local grid rules and shipment documents all affect the final product choice.
Start from the loads, not the battery catalogue
A small home can often be covered by a 5kWh wall battery if the backup panel only carries lights, router, refrigerator and a few sockets. Larger homes with air conditioning or pump loads usually need a larger battery bank and a higher inverter output.
If the installer has not separated essential loads from whole-house loads, quote ranges can become messy. We normally ask for the backup load list first, then match battery capacity and inverter power around that.
- Essential-load backup: 5-10kWh is common
- Whole-house backup: check surge load before choosing inverter size
- Long outage areas need usable capacity, not only nameplate capacity
What OmniSol checks before quoting
We review whether the project is single-phase, split-phase or three-phase, then match the battery voltage platform and communication requirements. For lithium battery export, we also check whether UN38.3, MSDS and carton labels are ready before promising a shipment date.