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Power Stations

Is Your Portable Power Station Killing Your Electronics?

· 6 min read · Watch the video →

I recently had a video consultation with a viewer who experienced a frustrating and costly problem: his sensitive home electronics were dying randomly during power outages. The culprit? His portable power station. The shocking truth is that even power stations rated for pure sine wave output can deliver dirty, dangerous power under certain charging conditions. Let's break down how this happens and, more importantly, how to fix it.

What I Built

To understand this issue, I replicated my viewer's setup using an Anker power station as the primary unit, connected to a Kill A Watt meter to monitor its output. For the "dirty power" source, I used another power station with a 110-volt output to simulate a basic gas generator. I also demonstrated the behavior with an EcoFlow Delta and a DJI Power 1000, illustrating that this isn't unique to one brand.

For the solutions, I brought in a pure sine wave inverter generator (a better alternative to dirty gas generators) and a Temgo 51.2V 100Ah LiFePO4 battery kit with its accompanying 56.8V 18A smart charger. I also showed how an external MPPT solar charge controller fits into a robust clean power setup.

Why It Works

The core of the problem lies in a feature called “pass-through charging.” When a power station is plugged into an AC source (like a gas generator) to recharge its internal battery, and you simultaneously draw power from its AC outlets, many units will bypass their internal inverter. Instead, they redirect the incoming AC power directly to the outlets. This means if your charging source provides dirty power (like many traditional gas generators), your sensitive electronics will receive that same dirty, unregulated power, even if the power station itself has a pure sine wave inverter.

The internal inverter, which is responsible for producing clean, stable AC power from the battery's DC, is essentially taken out of the loop for output and is instead used in reverse to charge the internal battery. This leaves your connected devices vulnerable to voltage fluctuations, harmonics, and other irregularities from the external charging source, leading to potential damage.

Parts & Specs

Math & Run-Time Numbers

When the Anker power station was running solely on its internal inverter, the Kill A Watt meter consistently showed around 119.0-119.2 volts. This is what you'd expect from a clean pure sine wave output.

However, when the Anker was plugged into my simulated dirty power source (a power station providing 110V output) and drawing about 790W input, the output voltage to the loads immediately dropped to around 108.7-108.8 volts. This clearly illustrates the pass-through charging effect, where the dirty source's voltage is directly transferred to the loads.

The EcoFlow Delta and DJI Power 1000 exhibited similar behavior, showing an output of around 109.8-109.9 volts when charging from the simulated dirty source, compared to their clean 120.1-121.5 volt output when running independently. This confirms the widespread nature of the issue across various brands.

Using Solution 3, with the Temgo battery and smart charger, the Anker power station consistently maintained a clean 120.4-120.8 volts output, even while the external charger was taking in power from the dirty source at over 1000 watts. This setup effectively isolates the loads from the dirty input.

Pros & Cons

Solution 1: Do Not Connect Loads While Charging from a Dirty Power Generator

Solution 2: Use a Pure Sine Wave Inverter Generator

Solution 3: Convert Dirty AC to DC Externally Before Charging the Power Station

When To Use This vs. Alternatives

If you currently rely on a traditional, non-inverter gas generator and a portable power station for backup, you absolutely need to address the dirty power problem. Solution 1 is a bare-minimum approach for emergencies, but it's inconvenient and still poses some risk to your power station. It's really a last resort.

Solution 2 is excellent if you're in the market for a new generator anyway. Investing in a pure sine wave inverter generator solves the problem at the source and provides clean power directly. This is a great choice for those who value simplicity and direct compatibility.

Solution 3 is my personal favorite and offers the most robust and versatile setup. It's ideal for those who already have a dirty power generator they want to keep (maybe it's reliable and they know how to fix it) or for anyone looking to maximize their energy independence. By adding an external battery and charger, you not only clean up the power but also dramatically increase your total energy storage and can integrate a powerful solar charging solution. This method also protects your power station from the dirty input, as the external charger handles the conversion.

Bottom Line

The pass-through charging issue is a critical oversight that many portable power station owners aren't aware of. Ignoring it can lead to costly damage to your electronics. My recommendation is to implement either Solution 2 or Solution 3. Both provide clean, safe power to your sensitive loads and protect your valuable power station. Solution 3, while requiring more components, offers superior flexibility, increased capacity, and robust solar charging capabilities, making it an excellent long-term investment for energy independence.

Final Wrap-Up

I hope this breakdown helped clarify how your power station truly works and how to best protect your electronics. If you found this content helpful, please consider liking this post, leaving a comment with your thoughts or experiences, sharing it with others, and subscribing to the YouTube channel. Your engagement helps me continue delivering educational content like this. Stay safe!

Gear mentioned in this post

All the tested gear from this video lives on the Gear Store with affiliate links that support the channel at no extra cost to you.

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