Video summary

Is dit de ideale combinatie om zoveel mogelijk zonnestroom te gebruiken?

Main summary

Key takeaways

Product Review

Product(s) reviewed

A solar self-consumption upgrade combining:

  • Lun/“Lunigi” home battery system (~10 kWh)
  • Electric PV-controlled hot water boiler tank (150 L, “Tesy” brand mentioned)
  • Smart control/monitoring via HomeWizard (socket/plug), plus DIN rail monitoring and a PV distribution box

Central goal: use as much of the home’s own solar power as possible to reduce:

  • Grid feed-in (and its penalties)
  • Gas usage for hot water

Main features mentioned

Battery system (Lun/“Lunigi” home ACU)

  • ~10 kWh storage
    • Framed as larger than earlier batteries mentioned (up to 2.5 kWh)
  • Stackable modules
    • “Just stack them up” (no screws/clips between layers mentioned)
  • No-nonsense design
    • Minimal display; includes what’s needed to keep pricing down

Connectivity & safety/installation

  • Harder to unplug/replug than plug-only setups
    • Designed so it can’t be easily reconfigured by simply moving it between sockets (safer)
  • Max power use: up to 2400 W
  • HomeWizard DIN rail module and a 16A switch/main switch
    • Protected/fused at 16A
  • Ventilation required (battery needs proper airflow)

Practical note

  • The battery has wheels
    • Potentially useful for moving it (e.g., using it for select loads during a power outage such as a fridge/freezer)

Hot water boiler tank (Tesy, 150 L)

  • 150 L boiler tank installed in the attic near the central heating boiler
  • Heats water to ~60°C
  • Two operating modes / boost function
    • 1200 W and 2400 W
    • Chosen setting: 1200 W to better match battery draw and avoid frequent cycling

Two-mode heating strategy

  • When solar/battery power is sufficient → boiler tank heats water
  • When solar/battery can’t cover demand (e.g., night or cloudy periods) → the central heating boiler provides backup comfort

Safety: Legionella control

  • Includes Legionella prevention
    • Boiler is left running for a full day once per week
    • Scheduled “legionella run” described with Tue–Sun programming and Monday activation at sunrise (as explained)

Smart control & electrical integration

  • Boiler plugged via HomeWizard plug for intelligent switching
  • A PV distribution box (small meter box) added so an extra circuit isn’t required
    • Includes main switch and two aluminum fuses/RCDs
  • DIN meter for solar monitoring was moved into this arrangement

How it works (user experience / workflow)

  1. Solar energy → battery first
    • Battery is set around a “zero net energy” concept
  2. If excess solar remains → routed to the boiler tank to make hot water
  3. Battery-driven monitoring/control logic
    • Turn boiler on when battery charging is > 1800 W
    • Turn boiler off when charging drops < 500 W
  4. Backup comfort ensured
    • If battery is empty or no sun for a day → central heating boiler switches on
  5. Communication failure safety net
    • Boiler is set to turn off at sunset daily, so failures fail “safe”
  6. Installation reality
    • Attic plumbing for the 150 L tank was tighter than expected
    • Required interrupting the cold-water pipe routing to the central heating and inserting the boiler between

Comparisons / alternatives discussed

  • Option A (manual/threshold with HomeWizard socket + Metax)
    • Possible, but requires a HomeWizard account and subscription
    • Subscription mentioned as about €6/year or €12/month (as stated)
  • Option B (battery-based switching) (selected)
    • Preferred as “cheapest” and simpler

Battery size comparison

  • Previous modules referenced: up to 2.5 kWh
  • Current system: ~5 kW modules and larger total capacity (about ~10 kWh total)

Pros (key advantages stated)

  • Reduces wasteful grid export and associated feed-in penalty/fines
  • May lower electricity purchases
    • Charging from solar and using stored energy
  • Reduces gas consumption for hot water
    • Using solar-electric heating instead
  • Safety-minded design
    • Battery avoids risky plug-based handling
    • Legionella prevention routine included
    • Sunset/off safeguard if automation fails
  • Cost emphasis
    • Speaker hopes it “doesn’t have to be very expensive” if you have attic/space for the boiler tank
  • Installation practicality
    • Battery appears relatively straightforward; modular and stackable
  • “Sleeper benefit”
    • Wheels could help in an outage scenario for selected loads (fridge/freezer)

Cons / risks / limitations mentioned

  • Winter limitation
    • Less solar means less full battery charging, impacting how much hot water comes from solar-electric heating
  • Payback depends on assumptions
    • Cycling and efficiency losses reduce real-world certainty
    • “It remains to be seen” if actual payback matches projections
  • Boiler installation constraints
    • Attic installation was tighter than expected
    • Speaker later suggests a 100 L tank might be easier (though the project still worked)
  • Automation cost caveat (for Option A)
    • Reportedly requires account + subscription
  • Ventilation requirement for the battery

Numerical ratings / scores

No explicit star ratings. However, multiple concrete numbers and costs are provided.

Energy / performance assumptions

  • Battery storage: ~10 kWh
  • Battery cycling assumption: ~200 full charge/discharge cycles/year
  • Boiler heating target: ~60°C

Household impact (solar export situation)

  • Solar generation last year: ~3,900 kWh
  • Exported to grid: >2,600 kWh
  • Feed-in penalties/fines: ~€340 last year
  • Net metering phase-out expected: end/phase-out expected in 2027

Costs

  • Battery cost:
    • €2,350 during discount period (at filming)
    • After discount: €2,500
    • Discount code: “Norbert” (6% off to reach ~€2,350)
  • Boiler tank cost: €520
  • Additional couplings/parts: ~€50–€100
  • Total boiler-related assumptions: not perfectly summed, leading into the gas savings estimate

Estimated savings & payback

  • Battery system savings: ~€370/year
  • Battery payback: about 6 years
  • Gas savings from boiler tank: ~€275/year
  • Boiler payback (theoretically): about 2 years
    • Caveat: winter reduces solar contribution

Overall verdict / recommendation

Recommended for households trying to maximize self-consumption, especially where:

  • Grid export penalties apply, and
  • Net metering will be phased out (2027)

The video suggests the battery + smart boiler approach can significantly reduce exported solar and lower gas usage for hot water, with payback estimated around:

  • ~6 years for the battery
  • ~2 years for the boiler tank

However, results depend on winter solar levels and real-world cycling.

Unique points mentioned (consolidated list)

  1. Goal: maximize own solar with 10 kWh battery + 150 L boiler tank
  2. Smart routing: solar → battery first, then excess → boiler tank
  3. Battery design: stackable modules, minimal display (“no super deluxe” UI)
  4. Battery safety: harder to reconfigure like plug-in alternatives; safer handling
  5. Battery power: up to 2400 W
  6. Installation: wheels included; battery heavy but manageable to move
  7. Monitoring: HomeWizard DIN rail module; solar DIN meters relocated for monitoring
  8. Boiler control: HomeWizard plug; thresholds >1800 W on / <500 W off
  9. Boiler heating target: ~60°C
  10. Boiler boost modes: 1200 W / 2400 W
  11. Chosen boost: 1200 W to reduce cycling frequency
  12. Backup heating: central heating boiler covers shortages (night/no sun)
  13. Legionella prevention: weekly full-day run; scheduled program + “sunset/off” safeguard
  14. PV distribution box to avoid extra circuit; includes switches and RCD/fuses
  15. Practical lesson: 150 L may be tight in attic; 100 L could be easier
  16. Winter limitation: less solar may reduce battery full charging and hot-water solar share
  17. Automation failure safeguard: sunset shutoff daily if communication fails
  18. Option comparison: - Option A: HomeWizard socket threshold control (requires account + subscription) - Option B: battery-driven switching (selected as cheaper/simpler)
  19. Financials: - Solar export penalty: ~€340 - Battery cost €2,350–€2,500 - Estimated savings: battery ~€370/year, boiler ~€275/year (gas) - Payback: battery ~6 years, boiler ~2 years (assumption-based)

Speakers’ contributions (grouped)

  • Niels (primary builder/installer, setup & engineering details)
    • Battery/boiler configuration, installation observations, control logic thresholds, technical safety/ventilation, sizing considerations
  • Host/parents/family context (house usage + comfort concerns)
    • Discussion of hot water demand in a multi-shower household; backup comfort emphasis
  • Niels’s father (system planning influence)
    • Suggested/idea for boiler integration and routing strategy
  • Lun sponsor mention / test framing
    • Sponsorship disclosure; battery and collaboration context
  • Tesy (boiler sponsor mention)
    • Boiler supplied for installation and testing

Original video