Solar and EV lab · Level 2 of 8
String sizing for the coldest and hottest day
Level 2 of 8 in the Solar and EV lab: a free solar and EV exercise at Intermediate level. Choose modules per string and strings per MPPT so the inverter is safe at the coldest temperature and still tracking at the hottest.
Free · no download. Your work is saved on this device. Updated 18 Oct 2026.
The brief
- Client
- Marlow Farm Shop
- Site
- Barn roof, Marlow Farm
- Work order
- WO-SEV-102
- Task code
- SEV-02
- Difficulty
- Intermediate
- Type of work
- Design
Choose modules per string and strings per MPPT so the inverter is safe at the coldest temperature and still tracking at the hottest.
Skills you practise
- String sizing
- Voc at minimum temperature
- MPPT window
- String fuse need
What the test checks
The acceptance test marks the skills this level practises.
- String sizing
- Voc at minimum temperature
- MPPT window
- String fuse need
In this lab
- Strings, protection and the day's generation
- Battery rules under a tariff
- Charger faults and load management
Levels in the Solar and EV lab
Previous: Site survey: name every part and every isolation pointNext: Select cables, fuses, isolators and surge protectors
- Site survey: name every part and every isolation point
- String sizing for the coldest and hottest day
- Select cables, fuses, isolators and surge protectors
- Generation against load: size the array for self-consumption
- Battery dispatch: cut the bill under a time-of-use tariff
- Commission the system: the safe energising order
- EV charger fault: a car will not charge
- Load management: three chargers on a limited supply
Part of the Solar and EV lab
Size a solar array, set a battery and fault-find an EV charger on a commercial site.
Feeds these internships: Electrical Design, Electrical and Solar Energy Systems.