My DCDC charger is lighting up but not outputting power from my solar panelUpdated 3 months ago

The DCDC charger will not start if your battery is full or very close to being full. To get it to start outputting power, ensure your auxiliary battery is drained to at least 90% (13.1V for lithium batteries). 

The charger will not kick in if no power comes through from the solar panel or blanket. Check the incoming amps from the solar panel using a clamp meter or an in-line wattmeter. If you have relays, circuit breakers or fuses between the panel and charger, ensure that you measure the incoming amps from either side, as these have been known to limit output. 

Ensure your panel's 'Open Circuit Voltage' fits within the charger's voltage range. For this unit to charge your batteries, your panel must output between 9V and 32V. Exceeding 32V will void your warranty. 

As the iTECHDCDC25/40 has built-in MPPT solar controllers, you must ensure no other MPPTs or solar controllers are in line. If there is, it will block incoming solar power. 

When this unit outputs solar power, you should see the profile LED and a flashing solar LED.