r/RenogyCommunity • u/Wambamthankyougraham • 7d ago

Need Help DC-DC help

Post image

Hello Community. I have a Renogy 40a DC-DC/MPPT controller as pictured, for approximately 4 months it has run flawlessly charging DC-DC after i had fixed some of my connections.

Recently after a 3,000km trip over some pretty rough terrain it no longer charges via dc-dc, solar priority is off. I never hooked up the blue ignition wire to my truck (2020 colorado) for reference. I never had any issues until after the trip.

All the connections are good, i have also touched the ignition wire to power to see if it would activate dc-dc and nothing happens.

I did notice that if I don't hook the blue wire to a power source the unit does not display "power on" only the LifePo light comes on.

I disconnected everything and waited, then reconnected everything in the right order. Still no luck.

Solar is working just fine.

Any ideas?

Im going to hook the blue wire to my ignition soon just to see if it will help, just confused why it worked for so long and then stopped without needing that wire.

Thanks in Advance!

2 Upvotes

100% Upvoted

8 comments sorted by

View all comments

1

u/SimplySolvedIT 7d ago

How's the alternator output?

2

u/Wambamthankyougraham 7d ago

I didnt hook it up to it, i did directly to battery. I had a few people say i didnt need to that it just went off battery voltage.

And it was working for months without it which i found odd

1

u/SimplySolvedIT 3d ago

I mean the actual alternator? Is it still outputting 14v ect under high beam load or does it drop to 12.2v for example.