Estimates based on a 4kWp system (10 × 430W panels + avg hybrid inverter + Type 2 EV charger + this battery). SEAI grant covers solar components only — apply at seai.ie before installation.
Tesla Powerwall 3 13.5kWh — Ireland 2026
One box for solar, storage and backup — built-in inverter, works with any solar panels
Homeowners who want a single premium all-in-one solution, or those adding battery to an existing solar system without replacing their current inverter — the Powerwall 3 AC-couples to any inverter brand
⚙️ Technical Specifications
| Battery chemistry | LFP (Lithium Iron Phosphate) |
| Capacity | 13.5kWh |
| Usable capacity | 13.5kWh |
| Continuous power | 11.5kW |
| Round-trip efficiency | 97.5% |
| Cycle life | 4,000 cycles |
| Warranty | 10 years (70% capacity) |
| IP rating | IP67 |
| Install type | indoor-outdoor |
| Wall mount | ✓ Yes |
| Backup power | ✓ Full whole-home backup — automatic transfer, seamless switchover |
| Monitoring | Tesla App |
| Expandable | ✓ 13.5kWh → 54kWh |
💰 Pricing & system cost
🚗 Pair with an electric car — charge from stored solar
A home battery and an EV are the most powerful combination for Irish homeowners. Your battery stores surplus solar during the day — your EV charges from it overnight at near-zero cost. A 10kWh battery fully charges most EVs from stored solar alone. See the full EV Vehicle Directory — 205+ electric vehicles available in Ireland.
✅ What we like
- 11.5kW continuous output — highest residential discharge rate in this directory
- Built-in inverter — no separate hybrid inverter purchase needed
- AC-coupled — retrofit to any existing solar inverter brand without replacement
- IP67 — the strongest weatherproofing rating in this directory
- 13.5kWh at 100% depth of discharge
- Tesla App — intuitive monitoring with time-based control and storm watch mode
- Full whole-home backup with seamless automatic transfer
⚠️ Worth knowing
- Premium price (~€11,000 installed) — the highest in the residential section
- Requires Tesla-certified installer — limited installer network in Ireland vs Huawei/Pylontech
- LFP but 4,000 cycle rating vs 6,000 for most LFP alternatives
- Not modular in the traditional sense — add units at ~€11,000 each
- No direct DC coupling to solar in retrofit scenarios — minor efficiency loss vs DC-coupled
📊 Battery ROI — estimated payback for Irish homes
Estimated annual savings and payback period for the Tesla Powerwall 3 13.5kWh at ~€11,000. Based on electricity rate of €0.33–0.35/kWh (mid-range Irish residential 2026). Assumes battery shifts solar-generated electricity from daytime export to evening self-consumption.
| Household type | Evening import | Est. kWh saved | Annual saving | Payback |
|---|---|---|---|---|
| Low usage (single/couple) | 3,000 kWh/yr | ~2,550 kWh/yr | ~€842/yr | ~13.1 yrs |
| Average home (family of 4) | 4,500 kWh/yr | ~3,825 kWh/yr | ~€1,262/yr | ~8.7 yrs |
| Higher usage (5+ / EV / heat pump) | 6,000 kWh/yr | ~4,928 kWh/yr | ~€1,725/yr | ~6.4 yrs |
Indicative only. Actual savings depend on electricity tariff, panel system size, usage profile, and seasonal generation. An energy management system (EMS) can improve self-consumption by a further 10–25%. Get a site-specific financial model from your installer.
⚡ Compatible inverters
The Powerwall 3 13.5kWh is compatible with the following inverters. Click any inverter to see full specifications, pricing and system cost estimates. See the Solar Inverter Directory to compare all 15 inverters available in Ireland.
☀️ Compatible solar panels
The Powerwall 3 13.5kWh is compatible with all solar panel brands available in Ireland — any panel that works with your compatible inverter will work with this battery. See the Solar Panel Directory to compare all 13 panels with specifications, pricing and SEAI eligibility.
Compatibility is via the inverter - ensure your chosen inverter is compatible with both your panels and this battery. All panel links above go to their individual review page.
🔧 Complete your solar system
The Powerwall 3 13.5kWh is Step 4 - you need solar panels and a compatible inverter before it, and an energy management system after it to get the maximum return from every kWh.
🧠 Energy Management Systems — get more from your battery
A battery stores your solar energy — an energy management system makes sure it's used at the right time. EMS devices can reduce grid import by an additional 10–25% beyond the battery alone by coordinating solar generation, battery charge/discharge, hot water heating and EV charging. See the full Smart Energy Directory for all EMS products available in Ireland.
🌡️ Pair with a heat pump — the night-rate combination
A solar battery and a heat pump are the most powerful combination for cutting your heating bill. Your battery charges overnight at the cheap night rate — then your heat pump runs from stored electricity during the day, delivering heat at a fraction of the cost of gas or oil. Browse all 18 heat pumps →
🔌 Pair with an EV charger — charge your car from stored solar
A home battery and an EV charger complete your home energy system. Store surplus solar in your battery, then draw it back through a smart charger to power your car — maximising self-consumption and cutting your fuel bill to near zero.
Your battery stores surplus solar during the day. A smart solar-compatible charger like the myenergi Zappi draws from your battery first — so your car charges on energy you generated for free. At night, the battery tops up on cheap off-peak rates (as low as €0.10/kWh) for the next day's driving. SEAI Home Charger Grant: €300 applies to eligible wallbox installations.
❓ Powerwall 3 13.5kWh — frequently asked questions for Irish buyers
🔋 Also consider
Other solar batteries available in Ireland.