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.

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.

Mobile Panels

Lightweight and low-profile for RVs, vans and trailers.

Standard Panels

Best cost per watt for homes, ground mounts and carports.

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.

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.

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.

Battery Capacity Testers

After a few years, you need to test the capacity of your system. You can use a shunt to test the capacity of your entire battery bank. But if you are not pulling good numbers or the voltage cuts out for no reason, you need to take your system apart and perform a capacity test on each battery.

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How to Test Battery Capacity

Disconnect the battery bank from all inverters, chargers, and loads.

Fully charge each battery to 100%.

Connect a capacity tester and discharge each battery to 0%.

Compare the results with the battery specs. Over 10% capacity loss may indicate an issue.

KKnoon Capacity Tester

Affordable tester for basic battery capacity checks.

KKnoon Capacity Tester

This one does work and I have used it a lot but it is pretty limited on what it can do. Run it at 75% of its rated current so it doesnt melt down. I havent had this one meltdown yet, but all the cheap ones before it did. Try to run a fan on it as well. Keep it nice and cool.

MakerHawk Capacity Tester

I like this one a million times more than the one above, but it is almost double the price. Easier to use, better interface and you can connect it to a computer.

MakerHawk Capacity Tester

Compact tester with a clear display and active cooling.

CBA V Pro

Reliable analyzer for precise battery capacity testing.

CBA V Pro

Lab calibrated capacity tester that I used for years but it has been on backorder for over a year. I love this thing but you just cant buy it anymore. Maybe find one used on ebay?

ITech IT8511A+ Electronic load

I have three of these and they are not cheap. They are absolutely fantastic but the software is horrid. It is calibrated and certified.

I can pull the same accuracy with the cheap units above. The main benefit of these load testers is the increased current capacity. It cannot cycle a battery though, so I use custom order battery cycling machines now to do capacity testing. But I still use these electronic loads when all the machines are taken.