Solar Generator Overload Error: Causes and Fixes
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A solar generator overload error means the load on the inverter went over its rated continuous or surge wattage, and the unit cut the output to protect itself. The usual culprit is a motor's startup surge: a refrigerator that runs at 150W can briefly draw 600W or more, and a table saw can surge to several thousand watts. The fix is to unplug everything, restart the output, then add loads one at a time, largest motor first.
What does an overload error mean?
Every power station has two output limits: a continuous rating (for example 1,800W) and a surge or peak rating (for example 3,600W for a moment). Go over the continuous rating for more than a moment, or over the surge rating even briefly, and the inverter shuts the output off. That is a protection feature, not a failure. The error clears once the load is removed and the output is restarted.
Why do motors trip the overload?
Motors and compressors draw a large inrush current for a fraction of a second as they start, often two to several times their running wattage. Resistive loads (heaters, kettles, toasters, the heating element in a coffee maker) draw roughly their full rating from the start with little surge. So a fridge trips a unit on its surge, while a microwave or space heater trips it by exceeding the continuous rating.
Typical ranges are below; your appliance's label or manual is the better source, and a plug-in watt meter shows real running draw.
| Appliance | Typical running watts | Typical startup surge | Overload risk |
|---|---|---|---|
| Table saw (10-inch) | 1,200 to 1,800W | Several times running | Very high |
| Small air compressor | 1,000 to 1,500W | Several times running | Very high |
| Window AC, 8,000 BTU | 700 to 900W | 2 to 4 times running | High |
| Window AC, 5,000 BTU | About 450W | 2 to 3 times running | Moderate |
| Sump pump, 1/3 HP | About 800W | 2 to 3 times running | Moderate to high |
| Full-size refrigerator | 100 to 200W while running | 600W or more | Moderate |
| Microwave | Its full rating, 800 to 1,800W | Little | High if above continuous rating |
| Space heater | 1,500W | Little | High if above continuous rating |
How do I reset a solar generator after an overload?
- Unplug everything from the AC outlets.
- Turn the AC output off and back on with its button. If the error persists, power the whole unit off, wait a minute and turn it back on.
- Check the display or app for an error code and look it up in the manual; overload codes differ by brand and model.
- Plug in the largest motor load first, let it start and settle, then add other loads one at a time.
The exact buttons and codes vary by model, so keep the manual (or a PDF of it on your phone) with the unit.
What order should I plug appliances in?
- Start the biggest motor load first, such as a fridge, AC or pump, with nothing else running, so the full surge rating is available to it.
- Wait for it to settle, usually 10 to 30 seconds after the compressor starts.
- Add small loads (TV, chargers, lights) one at a time.
- Avoid two motors starting together. A fridge and a freezer that both cycle on at once can exceed a surge rating that handles either alone.
Do X-Boost and Power Lifting prevent overloads?
Only for heating appliances. EcoFlow's X-Boost and BLUETTI's Power Lifting let resistive appliances such as kettles, hair dryers and space heaters run above the inverter's rating by lowering the voltage, so the appliance runs at reduced power. They do not help motor loads like refrigerators, pumps or air conditioners start. EcoFlow lists X-Boost ratings on its units (for example 2,200W on the DELTA 3, 3,400W on the DELTA 3 Max). If motor loads trip your unit, you need a higher surge rating, not X-Boost.
Why does my solar generator show an overload with nothing plugged in?
That points to a fault, not a surge. Other warning signs: an overload error at power-on before anything is connected, shutdowns well below the rated load, a burning smell, or unusual heat or discoloration near the vents. Stop using the unit and contact the manufacturer's warranty support. Do not open it; lithium battery packs need professional handling.
How do I size a solar generator so it does not overload?
Add up the running watts of everything you will run at once and multiply by 1.25 to 1.5 for continuous output; then make sure the surge rating covers your biggest motor's startup plus everything else already running. Our guide to choosing a solar generator and what a solar generator can power walk through the numbers.
Which solar generators handle high-surge loads?
For fridges, sump pumps, window ACs and power tools, look for a surge rating well above your largest motor's startup:
- EcoFlow DELTA Pro: 3,600Wh, 3,600W continuous, 7,200W surge, about $1,799. See our DELTA Pro review.
- Jackery HomePower 3000: 3,072Wh, 3,600W continuous, 7,200W surge, about $1,499 (Jackery and Amazon, October 30, 2026). See our HomePower 3000 review.
- Anker SOLIX F3000: 3,072Wh, 3,600W output, 4,860W SurgePad rating (7,200W AC surge), 2,400W solar input, about $1,700.
EcoFlow DELTA ProBuy at EcoFlowCheck price on Amazon
Jackery HomePower 3000Check price on Amazon
Anker SOLIX F3000Check price on Amazon
Our picks are based on published specifications, pricing, warranty terms and owner reports.
To avoid the error in the first place, see what not to plug into a power station or inverter.
Frequently Asked Questions
Why does my solar generator keep showing an overload error?
Usually a motor's startup surge (fridge, AC, pump, power tool) exceeds the surge rating, or a heating appliance exceeds the continuous rating. Start the biggest motor first with nothing else running, then add loads one at a time.
How do I reset a solar generator after an overload error?
Unplug everything, turn the AC output off and on, and if the error persists, power the unit off for a minute and restart it. Check the error code in your manual, since codes differ by brand and model.
Can a solar generator run a refrigerator without overloading?
Yes, if its surge rating comfortably covers the compressor start, which can be 600W or more for a fridge that runs at 100W to 200W. Start the fridge first with nothing else running.
What does surge wattage mean on a solar generator?
The maximum power the inverter can deliver for a very short time, to start motors and compressors. A unit rated 1,800W continuous and 3,600W surge can run 1,800W steadily and absorb a brief start-up spike up to 3,600W.
Why does my microwave trip the overload but my fridge doesn't?
A microwave draws its full rating (often 1,000W to 1,800W) the whole time it runs. If that is above the unit's continuous rating, it trips. A fridge runs at 100W to 200W and only surges briefly at startup.
Does X-Boost stop overload errors?
Only for heating appliances. EcoFlow's X-Boost and BLUETTI's Power Lifting run resistive loads such as kettles and heaters above the rating at reduced power. They do not help motors, pumps or AC compressors start.
My solar generator shows overload with nothing plugged in. What does that mean?
It points to an internal fault rather than a surge. Stop using it and contact the manufacturer's warranty support; do not open the unit.
