- ensure complete self-sufficiency of the 2-family house
- e-car charging from April to October
- drinking water heating (300 liters)
- completely manual control possible without internet (in the event of a blackout)

Parts list (not complete) of the installed devices:

  • 11 x EPever 10420 AN
  • charge controller
  • 11 x MT 50 display
  • 4 x Powerqueen LiFePo4 12.8V 410Ah (21kwh)
  • 4 x Powerqueen LiFePo4 12.8V 240Ah (12kwh)
  • 10x Sunpower 12V lead gel battery 270Ah (32.4kWh > 16kWh usable)
    • 5x Einhell battery charger CE-BC 30
    • 5x LiFePo4 chargers Powerqueen (40A)
    • 1x Briggs & Station P4500 emergency generator (4.5/3.7KW continuous output)
  • 23x 415W Trina Vertex solar panels (13kwp)
  • 3 module fields (1x south orientation, 1x south east orientation, 1x south west orientation) for max. yield
  • 3x Giandel 4kw / 12V/220V inverter

Structure of the battery banks:

12V in parallel circuit
Advantages: individual monitoring of the individual batteries possible, required technology very cheap

Function of the battery banks:

12V lead-gel battery bank supplies house, drinking water tank and is additionally supplied by LiFePo4 battery banks if required
(bad weather, high energy requirement)

Why? > Lead-gel battery bank is designed for high peak current
LiFePo4 battery banks can be switched on directly (manually) using sufficiently dimensioned cables
(Caution! Only possible if lead-gel battery has an 80% charge level (LiFePo4 open-circuit voltage 13.3 > lead gel 12.7V)

House supply:

3 circuits in 3-phase operation via mains power, each with 3 emergency switches for solar operation (solar operation only via luminous flux > Caution > restrictions on e.g. E. stove use)

Warning: system is not as 0 infeed or infeed system designed! The supply network must always be switched from or via the 0 position!

E-car charging:

A separate inverter + 21kwh battery is used for the e-car (excess energy)

Drinking water tank:

The same system is used for the drinking water storage tank (optional summer solution) as for the electric car (excess energy)

Winter operation and possible blackout

In winter, the system can be fully charged indirectly with 3.5KW in 10-12h via the generator and the chargers and ensures the supply of the house without restrictions for at least 24h

With 4x60l petrol cans, self-sufficiency can be secured for at least 2 months.

by Frank