Batteries for photovoltaics LG RESU FLEX
LG RESU FLEX is a high voltage battery range from LG ES. This category lists 4 LG RESU FLEX products with a usable capacity of 4.3 to 17.2 kWh. Guide
Suitable for: Home battery storage.
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Related storage categories
- Batteries for photovoltaics LG ES
- Batteries for photovoltaics LG RESU
- Batteries for photovoltaics high voltage
- Home battery storage
- Batteries for photovoltaics
LG RESU FLEX at a glance
LG RESU FLEX is aimed at family houses and small businesses: it stores the daytime solar surplus for the evening and the night. The battery management system talks to the inverter over RS485, CAN, so the inverter must list LG RESU FLEX as an approved battery before you order.
Protection ratings in this range: IP55. Units rated IP54 or higher can be mounted outdoors within the temperature limits in the datasheet. The range includes separate battery modules and control units, so a system can start at the minimum configuration and grow later within the stack limits that LG ES specifies.
Tip from practice
High voltage stacks are matched to the inverter by module count. Check the minimum and maximum number of modules your inverter model accepts before you fix the capacity, because that range decides which configurations will work.
How to choose a LG RESU FLEX configuration
The table lists every LG RESU FLEX product in this category with the key figures we hold for it. Choose in this order: inverter compatibility first, then usable capacity against evening and night consumption, then power and siting.
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LG RESU FLEX products compared
| Product | Usable capacity | Discharge power | Communication | IP rating |
|---|---|---|---|---|
| LG Energy Solution RESU FLEX 4.3kWh Battery Module | 4.3 kWh | - | RS485, CAN | IP55 |
| LG ES RESU FLEX battery 8,6 kWh | 8.6 kWh | 4.3 kW | RS485, CAN | IP55 |
| LG ES RESU FLEX battery 12,9 kWh | 12.9 kWh | 6.5 kW | RS485, CAN | IP55 |
| LG ES RESU FLEX battery 17,2 kWh | 17.2 kWh | 8.5 kW | RS485, CAN | IP55 |
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Frequently asked questions about LG RESU FLEX
What usable capacity does LG RESU FLEX offer?
The LG RESU FLEX products listed here offer 4.3 to 17.2 kWh of usable capacity, and the modular design lets you add capacity later. Compare usable capacity rather than nominal capacity when you size the system.
Is LG RESU FLEX a low voltage or a high voltage battery?
LG RESU FLEX is a high voltage battery. It needs an inverter with a high voltage battery input and does not work on a 48 V input.
Which inverters work with LG RESU FLEX?
Any inverter that lists LG RESU FLEX on its approved battery list. The battery communicates over RS485, CAN. Matching the voltage is not enough on its own, because the inverter and the battery management system must use the same protocol and firmware.
Can a LG RESU FLEX system be expanded later?
Yes. Additional modules can be added within the maximum stack size that LG ES allows. Keep new modules in the same product family and firmware generation, and expand while the existing pack is still relatively new.
Can LG RESU FLEX be installed outdoors?
Units rated IP54 or higher can be installed outdoors within the temperature range in the datasheet. The ratings in this range are IP55.
What is LG RESU FLEX used for?
Mainly for family houses and small businesses. It stores the daytime solar surplus for the evening and the night and, with a suitable hybrid inverter, can also supply backup circuits during a grid outage.
Where can I buy LG RESU FLEX batteries?
ONSA Plus supplies LG RESU FLEX to installers and resellers across Europe. This category lists 4 LG RESU FLEX products with current prices and availability, and there is no minimum order.
Usable capacity, backup behaviour and inverter compatibility depend on the specific inverter model, the wiring of the installation and the manufacturer's approved combination list.
About ONSA Plus
Why installers across Europe buy storage from us
ONSA Plus is a European B2B distributor of photovoltaics, battery storage, heat pumps and EV charging stations. In our own EU warehouses we keep over 1,500 products from 25+ brands, including Huawei, Solis, SolaX and Dyness.
We are not just a trading company. We design and service energy systems ourselves, so we answer questions on battery sizing, inverter pairing and backup wiring from engineering practice, not from a catalogue. There is no minimum order, so you buy what the job needs.
