New Lithium battery - Victron MPPT keeps losing power…

Chudzee

Just change the old lead acid battery out for a 100amp lithium. New lithium is at 100% SOC. Made all the required modifications on the Victron app to recognize lithium.

When I turn the battery kill switch to the on position the Victron (75/10 MPPT) will power up (little blue light on the side goes on) and then hear a click and the Victron controller goes dead…it stays in this loop (start-click-stop, start-click-stop) for as long as the battery kill switch is on. While this is happening the voltage on the Victron app shows anywhere from 0 - 9 and it flips around sporadically.
When I turn the battery kill switch off - the battery voltage on the Victron app settles in at 14.1-14.4.

I have called the battery supplier and they aren’t sure what is going on and their in-house specialist is on vacation for the next 2 weeks. I’ve googled the issue for hours and read the Victron manual for set up and trouble shooting. I’m not sure what to try next.

Does anyone out there have any advise or have any solutions?

Thanks

JamesDow

My suggestion would be unhooking and rehooking the wires and adding a load.

Below is a thread that I found which could assist.

Best of luck.

Victron smart mppt 100/20 goes up and down like a Yoyo and crashes output to zero | DIY Solar Power Forum

https://diysolarforum.com/threads/victron-smart-mppt-100-20-goes-up-and-down-like-a-yoyo-and-crashes-output-to-zero.26010/

Chudzee

Thanks for the information. I just read the post you sent. So to be clear, are you suggesting I unhook the wires going into the MPPT and then rebook those wires up?

Chudzee

Solution was found: turns out there is a fuse on the positive side of the Lithium battery that was blown but hard to detect. Battery is 100% fully charged but the blown fuse created a barrier between it and the Victron solar charger…hence the MPPT having the start-click-stop loop. Battery folks (Canadian Energy - Winnipeg) will swap that battery no issues! Very impressed with their service and willingness to trouble shoot the problem with me. (As an aside…the issue was actually detected by my older retired mechanic neighbour with a home made “ultra high tech voltage meter” consisting of a wire, clamp on one end, probe on the other end with a little light bulb!) Go figure!!

GulfCoast

Good news.

A fuse external to the battery? If so, why is a battery swap needed?

Chudzee

Good news indeed. Yes it is an external fuse (200amp). The local company wants to swap the entire battery. I’m ok with that, not going to argue!