Project-scale solar + storage
20kW Off-Grid Solar System for Commercial and Project Loads
LeforESS supplies configurable 20kW off-grid solar systems with PV modules, a hybrid or off-grid inverter architecture, LiFePO4 battery bank and project protection equipment. The page is built for installers, EPC contractors and buyers who can provide load, phase, autonomy and site data for technical review.
- Commercial loads
- Three-phase option
- Battery-bank engineering
- Project BOM
System architecture
Two Sellable Routes, Each Requiring Separate Approval
The current product range supports a modular 5kW-based reference and a dedicated Deye 20kW three-phase inverter. They should be quoted as distinct designs, not mixed into one unverified system.
Modular 20kW reference
The existing LeforESS system matrix shows four 5kW off-grid inverters, two 51.2V 10.24kWh wall batteries and thirty-seven 550W modules. This provides a 20.35kWp PV and 20.48kWh nominal battery reference, subject to approved inverter parallel and phase topology.
Deye 20kW three-phase route
The Deye SUN-20K-SG05LP3-EU-SM2 is a published 20kW three-phase hybrid inverter with a 40–60V battery range, 350A maximum battery current, two MPPT trackers and 32kW maximum PV input power. At this current, battery bank, busbar, cable and protection design are critical.
Review the Deye 20kW inverterReal components
20kW Project Supply Scope
The main visual and detail images use existing LeforESS and Deye product sources. They show real equipment without adding a fictional cabinet, factory or application scene.
PV generation
The existing matrix uses a 20.35kWp reference array; final stringing follows the selected inverter and site conditions.
20kW three-phase inverter
A real Deye 40–60V hybrid option with two battery inputs. Use the inverter page for the complete technical table.
Low-voltage battery bank
Battery quantity is selected around energy and current. A high-power 20kW design often needs parallel units after BMS approval.
Protection and accessories
Cable, busbar, fuse, breaker, isolator, SPD, earthing and mounting scope must be shown in the BOM.
Reference matrix
Published 20kW BOM and Design Boundaries
The reference quantities below are useful for buyer orientation, but they do not replace a load, string and protection review.
| System element | Existing reference | Required verification |
|---|---|---|
| Inverter route A | Four 5kW off-grid inverters | Manufacturer-approved parallel and phase configuration, synchronization, load sharing and protection |
| Inverter route B | One Deye SUN-20K-SG05LP3-EU-SM2 option | Destination grid code, three-phase load, PV strings, battery approval and 350A DC path |
| Battery reference | Two 51.2V, 10.24kWh wall batteries; 20.48kWh nominal total | Required autonomy, usable energy, continuous current, BMS protocol and parallel current sharing |
| PV reference | Thirty-seven 550W modules; 20.35kWp | Final module, string voltage/current, MPPT allocation, temperature and local solar yield |
| Balance of system | PV cable and connectors shown in the current range | Mounting, combiner, isolation, breakers, SPD, earthing, AC distribution, generator interface and packing |
Route B supports higher PV input than the reference array, but oversizing must follow the Deye limits and site design; it is not an automatic recommendation.
Engineering priorities
Six Checks Before a 20kW Quotation Is Reliable
These checks determine whether the proposed equipment can operate together and whether the commercial scope is complete.
Three-phase loads
List load by phase, largest surge and equipment that cannot tolerate interruption.
Battery current
Verify BMS continuous current, parallel count, cable, busbar and protection.
PV stringing
Check cold voltage, operating voltage, current and MPPT allocation.
Site interface
Confirm generator, grid, transfer, neutral, earthing and local protection rules.
Project fit
Applications That Justify a 20kW Engineering Review
A 20kW system may serve these project groups only after their load and energy requirements are measured.
Commercial and workshop loads
Selected tools, refrigeration, office and process loads with known three-phase balance and surge.
Agricultural and water systems
Pumps, controls and auxiliary loads where starting current, duty cycle and seasonal solar resource are documented.
Remote facilities and microgrids
Critical circuits with a clear priority schedule, generator interface and required battery autonomy.
Buying questions
20kW Off-Grid Solar System FAQ
The answers explain why the final quote depends on engineering inputs rather than one fixed kit.
Is 20.48kWh of battery enough for a 20kW system?
It is an existing reference capacity, not a universal answer. Backup time is calculated from actual load energy, usable battery capacity and losses; the battery bank must also deliver the inverter’s required current.
Can one Deye 20kW inverter replace four 5kW units?
It is a separate architecture, not a direct drop-in replacement. Phase, PV strings, battery current, communication, protection and installation must be redesigned around the Deye model.
Can the PV array be larger than 20kWp?
Possibly, if the selected inverter datasheet, string voltage/current, MPPT allocation and local conditions allow it. The 20.35kWp value shown here is one existing reference, not the limit for every inverter route.
What is needed before pricing a 20kW system?
Provide destination, voltage and phase, detailed load schedule, motor surge, daily energy, backup target, PV area, generator or grid interface, cable distances and required protection and packing scope.
Prepare a 20kW Quote That Can Be Technically Reviewed
Send the three-phase load schedule, destination, autonomy target, PV area and generator or grid interface. LeforESS will match the inverter, battery bank and project BOM.