In December 2025, Will Prowse released a major video titled “60,000W 480V 3 Phase Sol Ark + 60kWh Deye LiFePO4 600VDC Battery Testing!”. This review examines a large-scale, high-voltage battery storage system: a 60kWh (actual ~61kWh) Deye LiFePO4 battery operating at 600VDC, paired with a Sol-Ark 60kW 480V 3-phase inverter.

This is not a typical residential 48V setup — it’s an industrial-grade high-voltage energy storage system designed for high-power applications.

Battery Storage System Overview

The centerpiece is the Deye 60kWh LiFePO4 battery cabinet:

Rated capacity: 60kWh (Will measured ~61kWh total stored energy)
Nominal voltage: 600VDC (high-voltage series configuration of multiple battery modules)
Form factor: Single large cabinet on a pallet, temperature-controlled with an integrated heat pump (air conditioning system)
Cooling system: Uses condenser coil, evaporator coil, ductwork, and individual fans to circulate cooled air through the battery modules — essential for maintaining optimal temperature in hot environments
Safety features: Carbon monoxide detector, smoke detector, heat detector, automatic fire extinguisher, optional water sprinklers, and dual evacuation fans (top and bottom) to vent flammable gases if cells vent

The system steps down 480V 3-phase output to 240V via a 3000W transformer to power internal components like detectors and cooling fans.

Usable kWh and Discharge Limits

One of the most important kWh details Will highlights:

In off-grid mode, the system is limited to discharging only down to 10% SOC (state of charge)
This results in just ~6kWh usable energy out of the full 60–61kWh capacity during testing
Full discharge from 100% to 10% SOC took significant time, with the battery successfully supplying power under heavy loads
Charging time from empty to 100%: approximately 1.5 days (36 hours) under the tested solar input

This conservative 10% cutoff is a safety feature common in high-voltage commercial systems to protect cell longevity and avoid deep discharge risks.

Setup, Teardown & Internal Details

Will shows the battery cabinet internals: multiple LiFePO4 modules connected in series to reach 600VDC, communication cables, main disconnect switch, and high-voltage safety warnings.

The Sol-Ark 60kW inverter is compact (under 200 lbs) thanks to the high voltage/low current design — a key advantage over 48V systems that would require much thicker cables and larger components for the same 60kW output.

Load Testing and Performance Results

Will tested the system with large 480V loads (two 30kW heaters):

Peak draw measured: 60.9 kW from the battery
Initial problems: Overload errors, beeping alarms, battery over-current protection (default limit of only 20A), and startup surges causing contactor chatter
Troubleshooting: Switched from grid-tie to off-grid mode, increased battery current limit to 100A, removed 80% SOC power limit
After fixes: Successfully ran 60kW total load (one heater at a time, then both), assisted by ~5kW solar input
Surge capability: Datasheet claims 90kW for 10 seconds; real-world testing showed limitations at full 60kW without solar support
Cooling system performed well, keeping temperatures stable even under heavy discharge

The high-voltage design allows small-diameter cables and low current (around 100A at 600V for 60kW), making installation easier than equivalent 48V systems.

Pros and Cons of This 60kWh Battery Storage System

Pros:

Massive 60–61kWh total capacity in a single cabinet
High power output (60kW continuous, 90kW surge)
Excellent thermal management with active heat pump cooling
Comprehensive safety systems (detectors, auto-extinguisher, venting fans)
Compact inverter size due to 600VDC architecture
Low current reduces wiring costs and heat losses

Cons:

Very limited usable kWh (~6kWh tested) due to 10% SOC cutoff in off-grid mode
Complex setup requiring engineering-level troubleshooting
High voltage (600VDC) presents serious safety risks
Cooling system consumes extra power (1–2kW)
Very expensive and industrial-grade — not practical for most residential users
Long charge time (~36 hours from empty)

EGbatt Large-Capacity Alternatives

For users seeking high-capacity storage with better usable kWh ratios, EGbatt offers residential and commercial LiFePO4 systems in the 30kWh–60kWh+ range. Their high-voltage and stacked cabinet systems often allow deeper discharge (down to 5–10% SOC) while maintaining strong warranties and active cooling/heating options. EGbatt models typically deliver higher usable kWh percentages for off-grid homes or businesses compared to the conservative limits shown in this Deye test.

Final Verdict

Will concludes that the 60kWh Deye high-voltage battery + Sol-Ark 60kW system works well after proper configuration, successfully delivering up to 60.9kW and proving the capabilities of 600VDC storage. However, the extremely low usable capacity (~6kWh out of 61kWh) in off-grid mode, combined with setup complexity and safety considerations, makes it suitable mainly for commercial or industrial applications rather than typical home solar users.