Solar-only mode is a setting on some chargers that charges the car only from surplus solar power — what your panels produce beyond what the house is using — raising, lowering and pausing the session as surplus changes. It is also one of the loosest phrases in charger marketing — timers, adjustable current and “solar ready” labels are sold in the same language. The mode is real only when two ingredients are present — both checkable before you buy.
Key Takeaways
- Solar-only mode means charging that follows measured surplus — a sensor plus a charger that acts on it.
- “Solar ready,” timers and adjustable current are different things wearing similar language.
- Verify the feature line, the named sensor and the manual’s dull-day behaviour — in writing.
- No EVDANCE listing states a solar-only mode; adjustable current and timing are the stated tools.
The Two Ingredients the Real Mode Needs
First, something has to measure the surplus: a charger cannot follow power it cannot see. The mode depends on a meter or clamp at the home’s supply point reporting how much power is being exported. Second, the charger has to act on that reading, adjusting the car’s current to track it rather than running at a fixed rate. Remove either, and what remains is useful but different — a timer guessing at the sunny hours, or a current setting you adjust by hand. Our guide to solar panels and EV chargers covers how the pieces fit together in a solar home.
| Claim on the box | What it usually means | How to verify |
|---|---|---|
| A named solar-only or eco mode | Surplus-following is being claimed | Ask which meter it works with, and for the manual section that describes it |
| “Solar ready” or “solar compatible” | Often just that it works in a solar home — as every charger does | Ask what the charger does when the surplus changes; if nothing changes, there is no mode |
| App scheduling and timers | Sessions timed to the sunny hours | Useful, but it follows the clock, not the roof |
| Adjustable current | You match the roof by hand, in steps | Real help for solar homes; the following is done by you, not the charger |
The Four Checks Before You Buy
- The feature line names surplus following. Look for wording that the mode reacts to measured export — not just “solar” beside a timer.
- The sensing hardware is named. A clamp or meter is included, or a specific compatible home energy meter is listed. No named sensor, no sensing.
- The manual describes dull-day behaviour. Does the session pause, top up from the grid, or stop when surplus falls below the car’s minimum rate? A real mode’s manual answers this — and owns the honest trade: sessions slow and pause with the weather.
- Get it in writing. If the seller cannot point to the feature line, the sensor and the manual section, treat the mode as absent.
What You Can Do Without the Mode
A charger without a true solar-only mode is not locked out of solar charging. The car’s own charge timer — a feature of the car, not the charger — can aim sessions at the sunny hours, and an app timer does the same from the charger side. Adjustable current lets you set a rate your roof can carry and leave it there. These routes follow the clock or your judgement, not the export meter — close enough for many homes; how they combine with tariffs is covered in our guide to smart charging and time-of-use tariffs.
Where EVDANCE Models Stand
Plainly: no EVDANCE listing states a solar-only or surplus-following mode, and none should be inferred from other features. What the listings do state is adjustable current — the EV-ACS3210T adjusts from 10 to 32 A in six steps — and, on the EV-ACS3210E, an app with energy monitoring of the charger’s own sessions. Neither follows your export automatically. If surplus-following is your requirement, it is a written-confirmation item before buying any charger, ours included; the wider home range is on our residential EV charging page.
Frequently Asked Questions
Can a firmware or app update add solar-only mode later?
Only if the maker offers it and the sensing hardware exists. Software cannot follow a surplus that nothing measures, so ask the maker in writing whether the meter link exists.
Does “solar ready” mean the same as solar-only mode?
No. The phrase has no settled meaning across brands. Treat it as a prompt to run the four checks above, not as an answer.
Is solar-only mode worth having?
It depends on the car being home in daylight and on your roof’s surplus. It trades speed for self-consumption, and sessions pause in dull spells; if the car is away all day, a timer on an off-peak tariff may suit you better.
Related Reading
- Solar Panels and EV Chargers: How to Charge Your Car With Sunshine
- What Is Dynamic Load Balancing, and Why Does Your Wallbox Home Charger Need It?
- Smart Charging and Time-of-Use Tariffs: How Scheduling Cuts EV Charging Costs
- What Size EV Charger Can I Have at Home? Panel Capacity Explained
