C-Tek D250 SE and lithium charging - Expert required

Submitted: Thursday, Mar 10, 2022 at 16:45
ThreadID: 143374 Views:10666 Replies:5 FollowUps:14
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I have a friend with one of these. Its seems to have a strange profile, when compared to how my Redarc stuff works

This set up has a Victron meter as well, so we can see whats happening.

When charing the battery up (Lithium 100AH) if will charge it to 100%. Once it gets to 100% it will stop charging, and the appliances will start to bring the battery back down. The C-tek does not continue to supply any power, the battery will drop by 10% + before the C-Tek decides to charge again. If you disconnect the C-Tek it will start to charge again.

C-Tek tell us this is the way it should work. The issue is, when trying to be fully charge right at the end of the day with your panels, you could be as much as 10 to 15% down, as the C-teck has decided not to charge.. if this is the way they work, its stupid..

My redarc just keeps the battery at 100% and supplies the power the appliances need as well. Right up to the point solar is no longer supplying any power.

Can any experts on C-Tek comment on how these chargers should work, is C-tek correct in stating this is how they work?

PS: The Standard non Lithium version of this charger we have, charges "normally" as I would expect, always keeping the battery at 100%.. We just used the AGM profile and that seem to work for now.

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