Sol-Ark 40kWh L3 Battery Bank — IP20 Indoor, for the 30K-3P
A complete 40.96kWh lithium iron phosphate battery bank, built from 5.12kWh modules in a freestanding powder-coated steel rack and matched to the Sol-Ark 30K-3P three-phase inverter. 36.86kWh of that is usable at Sol-Ark's recommended 90% depth of discharge, and the bank can charge or discharge at its full 40.96kW rating.
It runs at 410V nominal, communicates with the inverter over CAN and RS485, and carries UL 1973, UL 9540 and UL 9540A certification — the system-level certification commercial inspectors increasingly require. IP20 / NEMA 1 means it belongs in a conditioned indoor space. Renewable Outdoors is an authorized Sol-Ark dealer — call us at (303) 876-7654 and we'll confirm the pairing for your project.
10-Year Warranty
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Expert Support: (303) 876-7654
Why the L3 40kWh Indoor Bank
40.96kWh of LFP Storage
Lithium iron phosphate in 5.12kWh modules — the chemistry commercial storage standardised on for safety and cycle life.
Full-Rate Charge and Discharge
Rated to charge and discharge at its full nameplate power, so the bank never becomes the bottleneck.
94% Roundtrip Efficiency
Measured at 25°C and 0.5C — very little of what you store is lost getting it back out.
410V High-Voltage Architecture
Matched to the Sol-Ark inverter it ships with, keeping conductor sizes and losses sensible at commercial scale.
UL 9540 and UL 1973 Certified
Certified at both the cell and the complete-system level, which is what commercial inspectors ask for.
IP20 / NEMA 1 Indoor
Freestanding rack in powder-coated steel, under 40 dBA at 30°C — quiet enough for an occupied building.
What's Included
What You Get
1 × Sol-Ark L3 HV-40 battery bank — 40.96kWh nameplate
8 × 5.12kWh LFP battery modules, rack mounted
Freestanding powder-coated steel rack
Integrated battery management system with CAN 2.0 / RS485 communication
Documentation and warranty paperwork
The Sol-Ark 30K-3P inverter, DC disconnects, conduit and interconnection hardware are separate. This bank requires conditioned indoor space between 40°F and 110°F — if you need an outdoor installation, we stock the IP55-rated L3 HVR bank instead. Call us at (303) 876-7654 and we'll work out which fits your site.
Sol-Ark L3 HV-40 Battery Bank Specifications
Nameplate Capacity
40.96kWh DC
Usable Capacity
36.86kWh DC at 90% depth of discharge
Module Capacity
5.12kWh per module
Cell Chemistry
Lithium Iron Phosphate (LFP)
Nominal Voltage
410V
Operating Voltage Range
392–448V
Recommended Depth of Discharge
90%
Maximum Continuous Charge / Discharge
40.96kW
Roundtrip Efficiency
94% at 25°C, 0.5C
Paired Inverter
Sol-Ark 30K-3P (120/208V three-phase)
Communication
CAN 2.0 / RS485
Enclosure Rating
IP20 (NEMA 1) — indoor only
Mounting
Freestanding rack mount
Material
Powder-coated steel
Noise
Under 40 dBA at 30°C (86°F)
Operating Temperature
40°F to 110°F (4°C to 43°C), 5–85% RH
Dimensions
23" × 23" × 64" (58 × 58 × 163cm)
Weight
957 lbs (434 kg)
Certifications
UL 1973, UL 9540, UL 9540A, UN 38.3, FCC, Prop 65
SKU
L3 30K-HV-40-IP20
Warranty
10 years product; performance warranty 10 years or 130MWh throughput
Ten-year product warranty with a matching performance warranty tied to energy throughput.
Lowest Price Guarantee
Found it cheaper elsewhere? Call us at (303) 876-7654 before you buy.
Authorized Sol-Ark Dealer
Genuine Sol-Ark hardware with full manufacturer support behind it.
Sol-Ark 40kWh L3 Battery Bank — IP20 Indoor, for the 30K-3P: Frequently Asked Questions
Which inverter does this battery bank pair with?
The Sol-Ark 30K-3P three-phase inverter. Sol-Ark's L3 series is built around specific inverter voltages, so the bank and the inverter have to match — this configuration is not interchangeable with the other L3 variants. If you're not certain which inverter your project uses, call us at (303) 876-7654 before ordering.
What does usable capacity mean versus nameplate?
Nameplate is the total energy the cells hold. Usable is what you should plan to actually cycle, which here is 90% of nameplate — Sol-Ark's recommended depth of discharge. Running a lithium bank to absolute empty shortens its life, so the 90% figure is the number to design against.
Where does it need to be installed?
It needs conditioned indoor space — a plant room, an electrical room or a similar area kept between 40°F and 110°F. It is IP20 / NEMA 1, which means it is protected against solid objects but not against water, so it cannot go outside or anywhere it might get wet.
How long will it last?
Ten years of product warranty, with a performance warranty expressed as energy throughput rather than just time — which is the more honest way to warrant a battery, because a bank cycled twice a day ages faster than one cycled twice a month. LFP chemistry is chosen for exactly this kind of duty.
What certifications does it carry?
UL 1973 for the battery, UL 9540 and UL 9540A for the energy storage system, plus UN 38.3 transport certification, FCC and California Prop 65. UL 9540 in particular is what a growing number of inspectors ask for on permitted commercial storage, so it's worth confirming with your AHJ early.
Can I add capacity later?
Sol-Ark's L3 platform is modular and supports multiple banks per inverter, so expansion is possible — but the design needs to account for it upfront, particularly the DC busbar and disconnects. Tell us where you expect the site to be in five years and we'll size the initial installation with that in mind.
How much does it weigh, and what does that mean for the floor?
These are heavy — the figures are in the specification table above and they are measured in hundreds or thousands of pounds. Floor loading is a real design input, not an afterthought, particularly for an indoor installation above a basement or on a raised floor. Your structural engineer will want the weight and footprint figures early.
How does it communicate with the inverter?
CAN 2.0 and RS485. The battery management system talks directly to the Sol-Ark inverter, which is what allows accurate state-of-charge reporting, proper charge control and coordinated protection rather than the inverter guessing at voltage.
Who installs it?
A licensed electrical contractor with commercial energy-storage experience, working to a stamped design and a permit. High-voltage DC is genuinely dangerous and this is not equipment to improvise around. We supply the hardware and the documentation your engineer and inspector will need.
Do you offer financing or price matching?
Yes. We offer 0% APR financing options through Affirm at checkout, and our Lowest Price Guarantee applies — if you find this cheaper at another authorized dealer, call us at (303) 876-7654 before you order and we'll take care of it.
