The Electron has a bq24195 PMIC which handles the charging and will prevent over-charging the battery.
However, for rooftop applications, you have to be a bit careful about temperature. The LiPo battery has a charging temperature range of 0°C to 45°C.
The Electron does not expose the charge thermistor connection, so you’d have to manually disable charging in your user firmware if you expect the temperature of the battery to exceed that range.
The operating range of the battery is -20°C to +60°C.