Solar panels, batteries and EV chargers in south Tenerife, designed and installed by a qualified electrician.
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Solar batteries in Tenerife: use your own power after dark
Battery storage sized to your evening consumption, and a straight answer on whether you need one at all.
Should you buy a battery?
The battery is the most expensive part of a solar installation and it is not always the best use of the money.
Yes, if
- Most of your consumption is after dark
- You get supply cuts and want backup
- Your usage is high and steady all year
- Your system already exports more than the compensation cap pays for
Probably not, if
- Your usage is mostly daytime: pool pump, air conditioning, home office
- The property is empty for long periods
- The budget is tight: extra panels return more for the same money
The export cap that changes the maths
Surplus sent to the grid is credited under RD 244/2019 simplified compensation, but the credit cannot exceed the energy part of your monthly bill. Past a certain system size you are giving energy away. A battery turns that surplus into energy you use in the evening.
What to compare between battery quotes
| Specification | Why it matters |
|---|---|
| Usable capacity (kWh) | Nominal capacity times depth of discharge. 10 kWh at 80% DoD is 8 kWh usable; at 95% it is 9.5 kWh |
| Guaranteed cycles and end-of-warranty capacity | How many full cycles the warranty covers and how much capacity is guaranteed at the end |
| Chemistry | LFP tolerates heat better and lasts longer than NMC, which matters more in the Canaries |
| Continuous and peak power (kW) | Decides whether the battery can run the oven, air conditioning and pool pump at the same time |
| Inverter compatibility | Batteries only work with listed inverters and communication protocols |
| Backup output | Whether the system can power selected circuits during a cut, and how fast it switches |
DC-coupled or AC-coupled
| DC-coupled (hybrid inverter) | AC-coupled | |
|---|---|---|
| Best for | New installations | Adding storage to an existing system |
| Conversion losses | Lower: solar charges the battery on the DC side | Higher: DC to AC to DC to AC |
| Existing inverter | Replaced by a hybrid | Kept |
| Backup | Available on most hybrids | Depends on the battery inverter |
Whether your current inverter can take a battery directly depends on the model. We check it before quoting, not after.
Siting and safety
- Never in direct sun, always ventilated: a battery in a hot cupboard ages much faster
- DC protection and isolation between battery and inverter as specified by the manufacturer
- Cable sized for the battery’s maximum charge and discharge current
- Clearances as per the installation manual
Registration
Adding storage is a modification of the self-consumption installation and has to be reflected in the certificate and registration. We handle it.
Talk to the electrician before you buy
Send a recent bill and a photo of the roof on WhatsApp. You get an honest first answer, including when it is not worth doing.
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