Testing - Libre Solar Box

[mikelovic]

Brainstorming

• place to put solarpanel depending on irriadtation (-> pyranometer)

• installation of solarpanels, mountin & wiring (-> how much wire we need?)

• connecting to box

• wires, mounting hardware

• testing devices -> pyranometer, multimeter

---

• calculation efficiency of whole system (solarpanels, MPPT, BMS, battery)

• maximum output, behaviour (temperature, efficiency level, nominal point)

• traces for validation (system parameter)

• choosing differents loads

• standards for decentral energy systems? VDMA, VDE?

• sheet with testing procedures

• preparing folder in github

[mikelovic]

@Tatytorres
specification of used solar panels at the fablab.
see: https://www.jws-store.de/solarenergie/solarpanels-mono-12volt/55watt-solarpanel-12-volt-monokristallin/a-194/

Technische Daten:

Nennleistung Pmax 140 Watt
Spannung bei Nennleistung Vpmax 22 Volt
Leerlauf Spannung Voc 26 Volt
Kurzschluss Strom Isc 6,87 Ampere
Strom bei Nennleistung Ipmax 6,36 Ampere
Temperaturbereich -40°C / + 85°C
Toleranz +/-3 %
Flexible monokristalline hochleistungs Solarzellen von SUNPOWER, Wirkungsgrad über 21%
Abmessungen: 1490 x 560 x 3mm
Gewicht 2 kg

[mikelovic]

Meeting 05.04

3 main parts for doing. goal finishing end of summer (30.09).

---

1. Testing of components (MPPT, BMS)

• what to test, how to test, when to test

2. Installation of Energy System in Fablab St.Pauli

• which loads, how much solar power, how much capacity -> design and layout
  till 06.18

3. Monitoring

• energy data monitoring and analysis
  till 09.18

---

next steps:

• talk to mr. kampschulte
  • access to laboratory, possibilties for praxis work, ...
• set up a concept plan
• set up a timeplan

[mikelovic]

Meeting 12.04

basic concept

concept for discussion @CollectiveOpenSourceHardware/00_reproduction_prototyping

[SchneiderAn]

Testing MPPT.pdf

[SchneiderAn]

[SchneiderAn]

Testing the BMS:

1. find out the BMS requirements / What does the BMS needs to do:
   • Voltage balancing
   • Temperature checking
   • etc
2. Testing if the BMS fulfils each requirement:
   • Measure the voltage at each cell
   etc

[mikelovic]

Messplan:

MPPT

• min/max Strom: 0..20A
• min/max Spannung: 16V..55V
• Effizienzpunkte (eta(P))
• Spannungsqualität am Ausgang (Regelverhalten bei Sprung am Eingang)
• MPPT Qualität (Abweichung, Zeit)

BMS

• min/max Strom: 0..30A
• (Schutzmechanismen - Ladeschlussspannung, Tiefentladeschutz)
• Effizienzpunkte (eta(P))

[mikelovic]

@Tatytorres @SchneiderAn - Hey guys, whats the status with testing the components?