Cloudy weather exposed an issue for one new off-grid household.
When the owner ran a propane generator to support a solar battery bank, the state of charge fell by 1% instead of rising after about half an hour.
Here's what to know
In a Reddit thread, the original poster asked, "How long does it take to register an increase in the battery SOC% when using the generator?"
Commenters said the outcome depends on how the system is built and configured. In some setups, the inverter does not handle battery charging at all; in others, generator power will not start charging the bank until a manual setting such as AC input or bulk charge is turned on.
One commenter described needing a similar process: "I have to hit an 'AC Input' button on my inverter screen, the 'Use,' then 'bulk charge' or something like that."
Another added, "If the generator produces less energy than you're consuming, then the charge will go down."
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More background
Several replies suggested that a working setup would usually show charging almost right away rather than after a long wait.
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"If the system is configured correctly, there should be an almost immediate increase in battery voltage," one commenter wrote. "Without further information, OP is going to have to wait to hear from their installer."
For most households, living fully off-grid can be expensive and complicated, so it may not be the right option for everyone. Understanding how a solar-plus-battery system charges can help homeowners avoid wasted fuel, unexpected outages, and confusing performance drops.
What can be done?
If you're interested in rooftop solar without going straight off-grid, EnergySage can help you curate competitive bids from local installers without sharing your contact information unless you choose to move forward. That makes it easier to compare equipment before you buy.
Homeowners can also use EnergySage's solar map, which shows the average cost of a home solar panel system by state, along with details on solar panel incentives for each state. Together, those resources can help homeowners find the best price for rooftop solar panels and access available incentives.
More From EnergySage
💡Go deep on the latest news and trends shaping the residential solar landscape
Adding battery storage to a solar setup is one of the best ways to protect your home during outages, save on energy costs, and go off-grid. Home battery storage can also help keep essential appliances running when sunshine is limited, or the grid goes down.
For people comparing options, EnergySage offers information on home battery storage, including competitive installation estimates. With EnergySage's help, the average person can save up to $10,000 on solar purchases and installations.
Where can I learn more?
These stories cover similar off-grid solar-and-battery issues, from generator backup to battery charging and system setup.
• In Tennessee, an off-grid family built a high-tech solar system that nearly ended generator use.
• One off-grid builder assembled an impressive battery garage powerful enough to charge visiting EVs.
• Across Reddit, off-grid homeowners debated the hardest part of cutting ties with utilities.
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