This SUNWAY indoor floor-mounted system handles high-load demands. The base unit provides 5.12kWh of LFP storage. If the site requires more, installers can stack up to three modules to scale the capacity to a total of 15.36kWh.
The built-in 80A solar charger handles a 6000W maximum PV input, with the MPPT operating between 120V and 500V. Standard functions include straightforward grid feed-in and live WiFi data tracking.
Capacity & Expansion
Stackable design using 1 to 3 LFP modules. The base capacity starts at 5.12kWh and scales up to a maximum of 15.36kWh.
PV Input
Handles up to 6000W PV input. The MPPT operational voltage ranges from 120V to 500V.
Output & Backup
Continuous 5kW AC output. Peaks at 10000VA. Outage transfer time is under 10ms.
Battery Specs
Utilizes LFP cells rated for ≥6000 cycles. Includes a dedicated lithium battery activation function.
Monitoring & Comms
Equipped with built-in WiFi, CAN, and RS485. Live system data is accessible locally via the LCD or remotely through the app.
Load Management
Configured with dual AC output to prioritize critical connected loads. Natively supports grid feed-in for power export.
Product Information Sheet
Model
FS5KS5121
FS5KS5122
FS5KS5123
1 Battery Module
2 Battery Module
3 Battery Module
PV Input
Rated Voltage (V)
350-360
MPPT Voltage Operation Range (V)
120-500
Max Input Power (W)
6000
Max Input Voltage (V)
500
Max Input Current (A)
18
AC Input & Output (Grid)
Max AC Input Current (A)
40
Rated Output Power (W)
5000
Max Output Power(VA)
5000
Rated Output Current (A)
21.7
Max Output Current (A)
23.9
Rated Output Voltage (V)
220/230/240
THDI
<3% (Nominal Power)
Emergency Output
Max Output Power (VA)
5000
Peak Output Power (VA)
10000
Max Output Current (A)
16-26.1
Rated Output Voltage (V)
220/230/240(+/-0.2%)
Output Frequency (Hz)
50/60(+/-0.2%)
THDU
<2%
Transfer Time(ms)
<10
Efficiency
Max Battery Discharge Efficiency
91%
Max Charge Efficiency (PV to battery)@Full load
98.50%
System Parameter
Dimensions (W*D*H)
674*170*775mm
674*170*1135mm
674*170*1535mm
Work Temperature Rang(℃)
-20~+60 (Derating @45 ℃)
Storage Temperature(℃)
-20~+45
Storage RH(%)1
5%~90% (non-condensing)
Altitude (m)
<2000
Ingress Protection
IP21
Dispaly
LCD/APP
Cooling Method
Natural cooling
Inverter Topology
Non-isolated
Installation
Floor-mount
Battery Pack Specification
Cell Type
LFP
Cell Configuration
16S1P
Nominal Voltage (V)
51.2
Nominal Capa ity (Ah)
100
Nominal Energy / Module (Wh)
5120
System Energy (Wh)
5120(1 Module)
10240(2 Modules)
15360(3 Modules)
Charge Voltage (V)
58
Max Charging Current (A)
100
Max Discharging Current (A)
100
Charge Temperature Range (°C)
0~45
Discharge Temperature Range (°C)
-20~60
Storage Temperature Range (C)
-20~45
Humidity (%)
5~95%RH
Cooling Method
Natural cooling
Cycle Life (Time)
≥6000(80% DOD, Remaining 80%)
Communication
CAN & RS485
Weight (kg)
55
Product details image
FAQs
Q1: Need more than 5.12kWh?
Start with one block. You can stack two more later if loads increase. Max capacity hits 15.36kWh. Just drop the new battery on top and wire it in. No inverter swap needed.
Q2: Grid fails. What happens?
Sub-10ms transfer time. Wire your critical gear to the primary AC port. The 5kW load shifts to battery power instantly. Desktop computers usually won’t even reboot.
Q3: Can I wall-mount this outside?
No. Floor installation only. It belongs in a dry garage or utility room. It’s heavy and not weatherproof. Don’t test it outdoors.
Q4: Max PV input?
6000W hard limit. The internal charger handles 80A. Build your panel strings to stay strictly inside the 120-500V MPPT window.
