A UK homeowner who passed on battery storage when installing rooftop solar is rethinking that decision after watching cheap daytime electricity flow back to the grid — only to buy power again at a much higher price in the evening.
Here's what to know
In a Reddit thread in r/SolarUK, the homeowner said, "My installer at the time told me batteries just aren't worth getting yet & I took his word for it… I'm exporting almost all of what i produce in daylight hours u/ 4. 1p and paying them back u/ 30p after work."
If a household can store one kilowatt-hour of solar power instead of exporting it for 4.1 pence and then avoid buying that same amount back for 30 pence later, the value of that shift comes to roughly 25.9 pence per kilowatt-hour.
For homeowners trying to determine whether the math works in their favor, you can explore EnergySage to compare home battery storage options and get competitive installation estimates. EnergySage has teamed up with the electrification brand Qmerit to guarantee you get the best price on home battery storage solutions. Another option is Pila, which offers excellent battery backup options, and its plug-and-play batteries are priced at a fraction of what a whole-home backup system would cost.
More background
Before putting more money into the system, the homeowner said they were looking at the Anker SolarBank 4 Pro and wanted to know what issues might come up with "existing inverter/wiring being compatible with another battery setup."
Drawing on a similar retrofit, one commenter said the key step is having an electrician confirm that the current wiring will allow a battery to be added without interference.
"The CT clamp positioning matters a lot, it needs to see both the grid feed and the solar generation to manage charging and discharging properly," the commenter wrote. "Don't assume it's plug and play even if the battery is designed for retrofit."
Other items the commenter said to check include the inverter output, the consumer unit layout, and whether there is space for a dedicated circuit.
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The original poster wrote, "Sounds like I just need to find a good local sparky who can assess what's already there."
Where can I learn more?
These stories look at battery financing, UK grid batteries, rechargeable cells, and battery pollution cleanup.
• SunPower and Palmetto offer backup batteries without upfront costs for cash-strapped homeowners.
• In the UK, advocates say neighborhood-scale batteries could cut bills by storing cheap power.
• At home, shoppers are using rechargeable batteries to save money on everyday devices.
• Scientists say toxic chemicals in common batteries may finally be easier to destroy.
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