Honest battery payback

Backtest against real 2023-24 EPEX + load data, side-by-side with the cracked thuisbatterijgids.nl formula. Inputs left, results right.

Best honest payback

{% if initial.best %}

{{ initial.best.title }}

Annual savings (year-1): €{{ '%.0f' % initial.best.lp_year1 }}/yr
Payback: {{ '%.1f' % initial.best.lp_payback }} years
Battery: {{ '%.2f' % initial.best.capacity_kwh }} kWh / {{ '%.1f' % initial.best.power_kw }} kW · €{{ '%.0f' % initial.best.price_eur }}
Store quote: €{{ '%.0f' % initial.best.store_year1 }}/yr ({{ '%.1f' % initial.best.store_payback }} yr) — overstates by {{ '%.2f' % initial.best.overstatement }}×

{% endif %}

Full leaderboard ({{ initial.batteries|length }} batteries · {{ initial.elapsed_seconds }}s · total solar surplus: {{ '%.0f' % initial.total_surplus_kwh }} kWh/yr)

≤ 0.8 kW plug-in (no electrician) ≤ 2.5 kW plug-in (own circuit) Hybrid / DC-coupled

{% for r in initial.batteries %} {% endfor %}

#	Battery	kWh	kW	€	LP €/yr	LP yr	10-yr net	kWh capt	% capt	% full	% sat
{{ loop.index }}	{{ r.title }}	{{ '%.2f' % r.capacity_kwh }}	{{ '%.1f' % r.power_kw }}	€{{ '%.0f' % r.price_eur }}	€{{ '%.0f' % r.lp_year1 }}	{% if r.lp_payback %}{{ '%.1f' % r.lp_payback }}{% else %}—{% endif %}	€{{ '%.0f' % r.ten_year_profit_eur }}	{{ '%.0f' % r.captured_kwh }}	{{ '%.0f' % r.captured_pct }}%	{{ '%.0f' % r.pct_hours_battery_full }}%	{{ '%.0f' % r.pct_hours_charge_saturated }}%