Solar & heat pumps — understand independently, compare honestly, decide well.
Your energy transition,
understood yourself.
A vendor-neutral knowledge hub for your own energy transition — from first principles to a finished project.
32articles
32learning-path chapters
DE · ENbilingual
As-of dateson funding and price facts; vendor-neutral
Learning Path
One staircase from the basics to deep control
One path from the basics to deep control — for everyone. Follow it in order, or jump in where it interests you.
-
01
Orientation
Why this exists & how to use it → -
02
Foundations
Energy basics: kW, kWh, and what "kWp" actually means → -
03
From concept to system
Why a heat pump doesn't behave like your oil boiler → -
04
Pro · Control
Why local control matters → -
05
Execution
KfW heating subsidy: the process → -
06
The journey
From 20 offers to one decision →
Sections
Or jump straight into a section
01
Concepts
- Energy basics: kW, kWh, and what "kWp" actually means
- How a PV system works
- Understanding modules
- Battery basics
02
Compare Offers
- Comparing offers honestly: the scope-honesty method
- Hidden cost drivers
03
Funding & Bureaucracy
- KfW heating subsidy: the process
- KfW loan 358/359 via your bank
- Stacking municipal grants
- The funding-traps checklist
04
The Journey
- Why this exists & how to use it
- The big picture: PV + battery + heat pump + EV
- From 20 offers to one decision
- My priorities
05
Reference
- Glossary & red flags in offers
- Check controllability: the HEMS & Home Assistant checklist
Updated
Recently updated
- Concepts Energy basics: kW, kWh, and what "kWp" actually means The single most common mix-up in offers and conversations, cleared up once — because everything else builds on it.
- Concepts How a PV system works From sunlight on the roof to power at the socket — the chain in four steps, and what actually drives yield.
- Concepts Understanding modules Mono or bifacial, cell quality, and the difference between product and performance warranty — without the marketing.
- Concepts Battery basics Nominal vs usable capacity, LFP vs NMC, depth of discharge, and sizing the battery to your array.
- Concepts How a heat pump works A fridge, thought about backwards — why a heat pump turns 1 kWh of electricity into several kWh of heat, without breaking physics.
How we write
Trust is the product
Vendor-neutral
Brands are compared on facts and trade-offs, never promoted. Where there is a ranking, the criterion is stated.
Honest about limits
We say when something does not work, or when the answer is “it depends”.
Dated and verifiable
Funding and price facts carry an “as of” date. Anything involving money or legal weight should be verified with the relevant authority.