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Find My Gear
Batteries
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12V UL Certified
Certified to UL1973. Consistent quality, audited over time.
12V Budget
Cheaper per amp-hour. Reliable today, no long-term guarantee.
48V UL Certified
Required if you are permitting your system or tying to the grid.
48V Budget
Great build quality, but off-grid use only — not permit-legal.
Battery Capacity Testers
After a few years, you need to test the capacity of your system.
Inverters
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12V Off-Grid
RVs, boats, vans and small cabins. 1,000–3,000W.
48V Off-Grid
Run a whole house off-grid. 6,000–12,000W.
48V Hybrid
Grid-tied plus battery backup. Certified for interconnection.
High-Voltage Residential
Highest efficiency. This is what I run in my own home.
3-Phase Commercial
Take an entire warehouse off-grid. Effectively unlimited capacity.
Solar Panels
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Mobile Panels
Lightweight and low-profile for RVs, vans and trailers.
Standard Panels
Best cost per watt for homes, ground mounts and carports.
Solar Mounting
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Ground Mount
Fast to assemble, engineered and legal for permitted installs.
Roof Mounted
Low-profile systems engineered for secure, long-lasting roof installations.
Solar Carports
Dual-purpose structures that provide shade while generating clean energy.
Generators
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Anker Solar Generators
Build a system in minutes! Beginner friendly and reliable.
Jackery HomePower
This is the only Jackery that I like. The output for the size and price is fantastic.
System Packages
  • Will Prowse's Systems
Don't Want to Piece it Together?
These are complete, wire-by-wire builds I’ve assembled and tested myself. Every fuse, lug and breaker is specified, so nothing shows up missing on install day.
Compare Complete Builds

Hand-Truck 48V System

Hand-Truck 48V System ~$2,400

Off-Grid Home Blueprint

Full 48V house system ~$9,800

Code-Compliant 48V System

Permit & inspection ready ~$13,500

Components
Battery Chargers
Reliable charging for lithium batteries.
Wire & Connectors
Wiring essentials for a clean, reliable setup.
Fuses & Breakers
Essential protection for your electrical system.
Crimpers & Tools
Tools for building and maintaining your system.
Battery Monitors
Track your battery’s power and performance.
Solar-friendly A/C
Efficient cooling built for off-grid power.
12v Fridges
Efficient cooling for life on the road.
Components

Van or RV

Mobile, 12V, tight on space and weight

Boat

Marine-rated, waterproof, heated cells

Cabin or Shed

Small off-grid build, 12V or 48V

Whole House

Off-grid or grid-tied with backup

  • Batteries

48V UL Certified Batteries

The batteries below are certified to UL1973 and UL9540 standard. This is not an easy task! The biggest benefit of this listing is consistency of quality over time. Non-certified batteries can change cells and hardware whenever they please, but not these batteries. Whether you buy these batteries today or in five years, they will have consistent quality standards and third party audits. If you want something you can rely on, you have come to the right place!

Affiliate links below

  • Highest Quality and Lowest price

Ecoworthy Cubix 100

Rarely do you see a battery performing better than the competition and being cheaper! This battery blows me away. Not only is it the lowest priced one, but the cells test higher than anything else I have ever tested! And this battery has UL1973 and UL9540! So you can legally install this anywhere.

  • Rapid shutdown built in
  • 10 year warranty
  • Close loop communication with most inverters
  • Large terminals and built in breaker
  • Bluetooth connection
  • Remote trip shunt

Check out these capacity test results. This battery has the best performance I have seen in a battery. This test was done at 100A charge and 100A discharge

  • All batteries are compliant to amazon associates operating agreement.

Ecoworthy Cubix 100

Ideal for smaller systems or expanding an existing battery bank.

Purchase the Cubix 100

4X Batteries

More storage for whole-home backup and larger off-grid systems.

Purchase 4X Batteries

6X Batteries

Maximum storage for high-demand homes and extended backup.

Purchase 6X Batteries

Or buy it direct from ecoworthy for a lower price

Purchase the Cubix 100 at Ecoworthy

Ruixu Lithi 16

Powerful 16kWh battery designed for whole-home energy independence.

Click here to Purchase
  • Best Build Quality

Ruixu Lithi 16

This battery has the best quality around! And it is waterproof, UL listed (for permitted systems with hybrid inverters) and has an easy to replace BMS.

The product pictures do not do a justice at all. This thing looks great in person.

The communication setup beats every battery I have tested so far. If you can afford it, this is a great option!

  • Built for long-term use

What Makes the Ruixu Lithi2-16 
Stand Out

High-capacity LiFePO4 storage with built-in safety systems, broad inverter compatibility, and a design made for demanding residential installations.

  • 16.07kWh of energy storage
  • 51.2V, 314Ah LiFePO4 battery
  • 9,500+ cycles at 80% depth of discharge
  • UL1973 and UL9540 certified
  • Built-in self-heating for cold-weather charging
  • 5-inch capacitive touchscreen
  • Integrated fire protection module
  • Dual fuse and circuit breaker protection
  • CAN and RS485 inverter communication
  • 10-year limited warranty
  • Easier to install and expand

Designed for 
Real-World Energy Systems

High-capacity LiFePO4 storage with built-in safety systems, broad inverter compatibility, and a design made for demanding residential installations.

Outdoor-ready enclosure

The electro-coated metal enclosure helps protect the battery against moisture, corrosion, and demanding installation environments.

Built-in mobility

Four concealed heavy-duty wheels make the 302-pound battery easier to position, while an anti-tip bracket secures it to the wall.

Serviceable design

A dedicated inspection port provides convenient access to the BMS and internal fuse for maintenance or replacement.

Expandable storage

Connect up to 32 batteries in parallel to increase capacity as household or commercial energy requirements grow.

Flexible inverter compatibility

CAN and RS485 communication support integration with a wide range of popular hybrid and off-grid inverter brands.

  • 48V UL Certified Batteries

Powerpro Battery by EG4

Powerpro batteries are a fantastic choice and can be installed in any state. They do cost a bit more than the competition, but it is backed by an american company.

​Indoor Rated Power Pro

High-capacity energy storage built for protected indoor installations.

Sold Out

Purchase Individual Indoor PowerPro Battery

Outdoor Rated Power Pro

Weather-ready energy storage built for reliable outdoor installations.

Purchase Individual Outdoor Rated PowerPro Battery
  • 48V UL Certified Batteries

EG4 Server Rack Batteries

I have made a lot of videos with these batteries and they work well. The only complaint I have heard on the forum is balancing issues. Be sure to charge them to 100% so that they can balance over time. The advantage to server rack batteries is that you can scale your system easily over time. Buy the largest rack you can fit and build your system slowly when funds permit.

EG4 LifePower4

Reliable 5.12kWh rack battery built for home backup and off-grid systems.

Buy at Signature Solar
Buy at Current Connected

EG4 LL-S Lithium Battery

Premium 5.12kWh rack battery with an LCD display and advanced monitoring.

Buy at Signature Solar
Buy at Current Connected

​Budget Battery Tower

High-capacity storage built for reliable backup without the premium price.

Buy at Signature Solar
Buy at Current Connected

Pro Model Battery Tower

Advanced battery storage with built-in displays for easier system monitoring.

Buy at Signature Solar
Buy at Current Connected
  • Media

My Latest Videos

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DIY Solar Power with Will Prowse
Solid State Marine Batteries: False Advertising?! Fire Risk? Battleborn Batteries Lawsuit Update LFP Battery Capacity For Dummies: In Only 2.5 Minutes! Reviewing My Model X After 100K Miles! (Not a Tesla Fan Boy) UL Certification for Dummies! Crash Course for Beginners