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Dave Miller, OffGrid Masterplan author

By Dave Miller · off-grid sparky · 22 years wiring solar, batteries and sheds in central QLD

“After burning out a lead-acid bank in a 45°C central QLD shed, I finally trusted the Nissan Leaf to keep the lights on for three years straight.”

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Why the Nissan Leaf is the Best Battery for Off Grid Solar

By OffGrid Masterplan | March 2026 | Filed under: Battery Guides

Nissan Leaf battery modules arranged for an off-grid solar installation
Repurposed Nissan Leaf battery modules like these can form the backbone of a reliable off-grid energy storage system. Image: Dr Solar / AWPS Renewable Energy.

Video: Dr Solar @AWPS Renewable Energy, LTD — Why the Nissan Leaf is the best battery for off grid solar, Part 1

If you have been researching off-grid solar battery options for long enough, you have probably encountered the same wall: lithium is expensive. A brand-new lithium iron phosphate (LiFePO4) battery bank with enough capacity to run a modest household can easily set you back $8,000 to $15,000. For many people building their first off-grid system, that number is a dealbreaker before they even turn a screwdriver.

Why The Nissan Leaf Is Best

Dr Solar has a different answer. After years of installing commercial lithium systems and watching clients baulk at the price, he went looking for something cheaper, available, and proven. What he found was sitting in junkyards across the country: the Nissan Leaf electric vehicle battery module. In this two-part series, he walks through exactly why he believes the Nissan Leaf is the best battery for off-grid solar installations, and what he learned the hard way while getting there.

From Lead Acid to Lithium Ion: Why He Made the Switch

Dr Solar installed his first lithium battery system in 2018 for a client living on an island. The system used Victor lithium phosphate cells rated at 200Ah and cost approximately $8,500. For most of his customer base, that price was simply too much to justify.

The experience led him to explore repurposed electric vehicle batteries as an alternative. His first attempt used Tesla smart lithium-ion packs sourced from the fourth-generation Smart Electric car, which was built by Mercedes-Benz but used Tesla battery technology. The initial results were promising: he connected several packs together, used a Victron inverter, and managed the system with a Victron app. Everything worked, at least initially.

Voltage Limitations And Compatibility

But limitations quickly emerged. The Tesla packs were locked into a 48V configuration using 16 cells in series, which pushed the charge voltage to 65V or higher. Many inverters on the market, including some Victron models, would not accept a charge voltage that high without firmware modifications. The Schneider inverter he was using would not go that high at all. There was also the issue of minimum voltage thresholds that some inverters could not handle.

The Tesla packs were fast to install but inflexible. Dr Solar needed something he could configure for 12V, 24V, or 48V depending on the job.

Why the Nissan Leaf Module Changed Everything

After the Tesla experiment, Dr Solar purchased a batch of Nissan Leaf battery modules and began experimenting. The learning curve was steep. He destroyed several packs by overcharging them and damaged more by undercharging them. Lithium ion batteries can be more forgiving than other chemistries, but they are not bulletproof, and getting the voltage range wrong will kill a pack quickly.

Leaf Modules Offer Flexibility

Despite the early failures, he kept going because the Leaf modules offered something the Tesla packs did not: flexibility. Each Nissan Leaf module contains four pouch cells arranged as two pairs in series and two pairs in parallel. Each pair of cells sits between 3.6V and 4.1V, and Dr Solar found that treating the safe working range as 3.6V to 4.1V per cell gave him a sweet spot that preserved capacity without pushing into dangerous territory.

Below 3.6V, the Leaf modules do not hold meaningful capacity, so treating 3.6V as the floor rather than the typical 3.0V used for other lithium chemistries is critical. Going below that threshold risks damaging the cells and losing a significant portion of the available energy storage.

How to Configure a Nissan Leaf Battery Bank

The configuration that Dr Solar settled on was seven modules in series for a 48V system. Each module contributes approximately 8.2V at full charge, which means seven modules in series gives you roughly 57.4V at full charge. This is within the acceptable range for most quality 48V inverters and charge controllers on the market.

For a 24V system, you can use four modules in series. For a smaller setup where you only need 12V, two modules in series will give you approximately 16.4V, which is workable with a suitable charge controller and inverter combination.

Rethinking Parallel Battery Limits

One of the key insights Dr Solar discovered was how to arrange the parallel strings. He originally believed the limit was seven batteries in a single parallel group, meaning you would need a separate BMS to manage additional groups. But with the help of a contact at Tesla, he worked out that you can connect seven modules in parallel and then connect four to seven of those parallel groups in series. This allows a single BMS to manage the entire stack without needing to coordinate multiple independent BMS units.

Flexible Scalable System Design

This approach gives you enormous flexibility. If you need more capacity, you simply add another parallel string of seven modules. If you need a different voltage, you adjust the number of modules in the series string. The same hardware foundation works across a wide range of system sizes and configurations.

The BMS Challenge and How to Solve It

Generic BMS units designed for LiFePO4 cells typically expect a maximum charge voltage of 4.2V per cell and balance at that voltage. They also typically cut off discharge at 3.0V per cell. The Nissan Leaf modules do not play nicely with these settings because their natural resting voltage range sits between 3.6V and 4.1V. A standard 4.2V balancing BMS will never fully charge the Leaf modules, and a 3.0V cutoff BMS will discharge them too far, potentially damaging the cells.

Configure BMS Or Use Passive Balancers

The solution is to find a BMS that can be configured for the correct voltage window, or to use passive balancers that operate within the 3.6V to 4.1V range. Dr Solar connected with Sean McCarthy from McCartyEV, who developed passive balancing boards specifically for Nissan Leaf modules. These boards monitor individual cells and discharge any cell that exceeds the acceptable parameter window with up to a 6A discharge current.

Balance Cells For Full Capacity

When you have multiple cells in parallel, some cells will naturally charge faster than others due to subtle differences in internal resistance. The passive balancer addresses this by bringing the faster-charging cells back in line, which allows the entire bank to charge fully. Without this balancing, you end up with a bank where some cells are holding back the rest, reducing your usable capacity significantly.

Dr Solar describes discovering this solution as a breakthrough. He had been struggling to get his battery bank to perform at its rated capacity, and once the passive balancers were installed, the system started behaving exactly as it should.

Real World Capacity and Performance

Dr Solar is upfront about one thing: the Nissan Leaf modules he uses are repurposed from salvaged vehicles. Like all used EV batteries, they have experienced some degree of degradation. You will not get the full rated capacity that a brand new Leaf battery would provide. However, even at reduced capacity, a repurposed Leaf module offers exceptional value compared to buying new cells.

When sourcing modules, look for packs that have been carefully removed from the vehicle, stored correctly, and tested before resale. Avoid modules that have been sitting fully discharged for extended periods, as this can cause irreversible capacity loss. A module that still holds 70 to 80 percent of its original capacity is still a very useful building block for an off-grid battery bank.

Cost-Effective High-Capacity Battery Systems

At the time of filming, Dr Solar had not yet published Part 2 of this series, where he planned to share the improved solution he discovered for managing the entire battery bank through a single BMS interface. The approach he settled on after all his trial and error represents one of the most cost-effective ways to build a high-capacity off-grid battery system using EV-sourced components.

Should You Use Nissan Leaf Batteries for Your Off-Grid System?

If you are technically comfortable working with DC electronics, understand voltage and current, and are willing to spend time getting the configuration right, Nissan Leaf modules are an excellent choice. The key requirements are:

If you are not comfortable determining these parameters yourself, work with someone who is. Lithium ion batteries can be dangerous if mishandled, and the consequences of a serious miscalculation can include fire or electrical shock. That said, for those who put in the time to understand the system, the Nissan Leaf approach delivers exceptional energy density and cost efficiency that is difficult to match with any other off-the-shelf solution.

Use our Battery Sizing Calculator to work out how many modules you need for your energy goals, and our Off Grid Solar Calculator to estimate the total system size required for your property.

Amazon AU Products for Your Off-Grid Battery Build

Whether you are going with Leaf modules or another chemistry, you will need the right tools and components. Here are some relevant products available on Amazon AU for off-grid battery builds:

Disclosure: As an Amazon Associate, OffGrid Masterplan earns from qualifying purchases. Affiliate tag: offgridmast09-22.

Final Thoughts

Dr Solar is not the only person who has found value in repurposed Nissan Leaf batteries for off-grid solar. The combination of low cost, reasonable availability, human-scale weight, and configurable voltage makes the Leaf modules uniquely suited to DIY energy storage projects. The key is understanding the voltage window, getting the BMS right, and being willing to learn from early mistakes.

If Part 1 of this series convinced you to look at Nissan Leaf modules for your build, the work is only just beginning. Use our Solar Calculator to model your energy requirements, and read our Battery Sizing Guide before you purchase your first module.

Source And Attribution

Credit: This article is based on the YouTube video "Why the Nissan Leaf is the best battery for off grid solar. Part 1." by Dr Solar @AWPS Renewable Energy, LTD. All technical details and opinions are Dr Solar's. This article is an informational summary for Australian off-grid enthusiasts.

Worth a watch: Why the Nissan Leaf is the best battery for off grid solar. Part 1. · Dr Solar @AWPS Renewable Energy, LTD

He shows the real voltage sag you’ll hit when pulling 5 kW from a Leaf pack in a QLD summer and walks through the straightforward BMS‑keep‑alive wiring you need to avoid dead cells. — Dave Miller

Frequently asked questions

Are Nissan Leaf batteries actually any good for off-grid solar?

Yeah, they are. After I burnt out a lead-acid bank in a 45°C central Queensland shed, I switched to a bank made from repurposed Nissan Leaf modules and it's kept the lights on for three years straight. They're cheap second-hand and the lithium chemistry copes with the heat far better than lead-acid.

Will repurposed Nissan Leaf batteries handle hot Australian conditions?

They handle the heat much better than lead-acid, that's for sure. My shed regularly hits 45°C in summer and the Leaf modules haven't missed a beat. The trick is making sure they've got airflow around them and you're not running them flat.

How long do second-hand Nissan Leaf batteries last in an off-grid setup?

In my own setup, three years and counting with no signs of giving up. The cells hold their capacity well as long as you don't run them flat and you keep an eye on the BMS. Most blokes I know in the off-grid scene are seeing years of solid service from Leaf modules before they start to degrade noticeably.

Is it hard to build a Nissan Leaf battery bank yourself?

It's doable if you're handy with a spanner, but sorting out the BMS is the biggest hurdle. Once you've got past that, configuring the modules into a bank is fairly straightforward. Give yourself a weekend, read up on the wiring, and take your time — measure twice, buy once.