PV Array
Peak capacity40kWp
Panel area~200m²
Panels~100 × 400W
LocationRemote, ground-mount
Est. cost€32,000 – €48,000
Na-Ion Battery
Capacity165kWh
Nominal voltage48V
Max charge25kW
Max discharge30kW
Est. cost€50,000 – €75,000
Sand Battery (Seasonal)
Mass150tonnes
Volume~95m³
Pit footprint~24m² @ 4 m deep
Temp range50 – 500°C
Thermal capacity~15,750kWh
Standby loss @ 400°C~1.5kW
Est. cost€70,000 – €100,000
Diesel Generator (Backup)
Power15kW
Fuel consumption~3L/h diesel
Footprint~8m²
Est. cost€8,000 – €15,000
IRE Wall Envelope
Total thickness50cm
Outer earth20cm (rammed)
Cork core10cm (HD Portuguese)
Inner earth20cm (thermal mass)
Earth k1.0W/mK
Cork k0.045W/mK
Target U-value~0.45W/m²K
Thermal lag~8hours
Est. cost€15,000 – €25,000 (cork)
GSHP (Geothermal)
Boreholes8 × 100–150m deep
Borehole spacing5–6m
Ground temp14°C
COP heating3.5 – 4.5
COP cooling4.5
Est. cost€25,000 – €40,000
Parabolic CSP (Roof)
Aperture area40m²
Focus temp600–700°C
Efficiency~55%
Peak output~22kW_th
HTFHot gas (air)
Priority 1Tank B DHW via HX
Priority 2Sand Battery charging
Priority 3Stirling engine (backup)
Est. cost€20,000 – €40,000
Stirling Engine (Backup)
TypeFree-piston
Electrical output9–25kW_e
Hot side temp600–700°C
Efficiency~28%
Activates whenSand full AND Tank B full
Output toNa-Ion Battery
Est. cost€15,000 – €30,000
Tank A (Buffer)
Volume2,500L
Temp range18 – 42°C
SourceGSHP
ServesUFH · cascades → Tank B
Est. cost€3,000 – €5,000
Tank B (DHW)
Volume2,000L
Temp range30 – 65°C
SourcesCSP (via HX) · Sand · LPG
ServesDHW (taps, showers)
Est. cost€2,500 – €4,500
LPG Boiler (Backup)
Power20kW_th
Tank2m³ (~1,050 kg)
Backup duration~2months winter
Est. cost€3,500 – €6,000
Biogas → Tank B Heating
Storage12m³
Burner power8kW_th
Activates when>80% full
PriorityBefore sand battery top-up
Surplus mode (>95% full)Boosts Tank B to 60°C
Biogas Cooking
Cooking power1.5kW_th (hob burners)
Activates when>60% full
Active hours7–9, 11–14, 18–21
Elec. savings~1kW_e (hob substitution)
Water Supply
Borehole pump300L/h · 1.5 kW
Non-potable tank5,000L
RO/UV throughput40L/h · 0.5 kW
Potable tank2,000L
Per-person — potable~30L/day
Per-person — non-potable~70L/day
Est. cost€20,000 – €35,000
Wastewater
Blackwater per person~30L/day
Greywater split60% of usage
Wetland reed bed~35m²
Anaerobic Digester
Volume12m³ (12,000 L)
Capacity20–30people
Target temp35°C (mesophilic)
Biogas yield~0.16m³/person/day
Retention time~22days
Est. cost€25,000 – €45,000
Biogas Storage
Capacity12m³
Calorific value~5kWh/m³ (effective)
Buffer~7days production
Est. cost€5,000 – €10,000
Pasteurizer
Batch size300L
Target temp70°C for 60 min
Burner power3kW_th
Maintenance power1.5kW_th
Immersion backup2kW_e (50→70°C)
Est. cost€8,000 – €15,000
Local Hot Water Tank
Volume500L
Solar collector5m² flat-plate
Target temp~50°C
ServesDigester HX · Pasteurizer
Est. cost€2,000 – €4,000
Fertilizer Storage
Tank volume600L (2 batches)
Garden drain~0.25L/h
OutputFood-grade fertilizer
Est. cost€1,000 – €2,500
EV System (V2G)
Default capacity120kWh (2 cars @ 60 kWh)
Charge rate7.4kW/car (32A)
V2G discharge7kW/car
Min SoC (V2G floor)60%
Est. cost (infra)€3,000 – €6,000
Building
Communal house387m²/floor × 3
Default living area774m² (2 floors)
Default residents10people
Design capacity20–30people
InsulationIRE Sandwich (U-value ~0.45)
Cork Core€15k – €25k
Shell + fit-out€2.15M – €2.78M
Total Technology Package
PV + Battery + Sand€152k – €223k
GSHP + Thermal€37k – €60k
Water + Waste€61k – €111k
Backup (Gen + LPG)€12k – €21k
Communal house build€2.15M – €2.78M
TOTAL MOTHERSHIP~€2.5M – €3.4M
+ 4 satellite houses€1.0M – €1.4M
FULL ESTATE~€3.6M – €4.9M