{"id":107,"date":"2023-07-20T18:27:28","date_gmt":"2023-07-20T18:27:28","guid":{"rendered":"http:\/\/rodbinder.com\/veteran\/?p=107"},"modified":"2023-08-31T09:34:09","modified_gmt":"2023-08-31T09:34:09","slug":"july-20-lazaras-name-for-my-lfp","status":"publish","type":"post","link":"http:\/\/rodbinder.com\/veteran\/2023\/07\/20\/july-20-lazaras-name-for-my-lfp\/","title":{"rendered":"July 20 Lazarus, Name for my Dead LFP"},"content":{"rendered":"

“Our friend Lazarus has fallen asleep; but I am going there to wake him up.”<\/strong><\/p>\n

John 11:11<\/strong><\/p>\n

I am not religious, I do believe in God, and John Wayne.<\/p>\n

My brand spanking new $1000 (today’s price CDN)\u00a0 LIFEP04 24v 100Ah was dead.\u00a0 I had it directly connected to my input on my Bluetti. That story is in a previous post.\u00a0 My fault, I fell asleep with my Bluetti on, and it drained my LFP so low my charger couldn’t see it.<\/p>\n

Like I said in my Bluetti<\/a> post, my monitoring solution is on its way.<\/p>\n

I carried the 48-pound battery down the stairs, yes with a broken back, and damaged knees. One step at a time. I got it set up on an end table I made when I was more active.<\/p>\n

I spent time yesterday looking for an answer to my problem. All the answers out there were for 12v batteries. I needed a 24v answer. I did have two almost-dead 12v AGM. I wonder if that would help.<\/p>\n

I contacted Red O D O tech support. This is what they said.<\/p>\n

Hello Rod,
\nI might have misunderstood your battery question \u2639 So sorry.
\nAre you meaning your battery BMS is being cut off for over-discharging?
\nIf yes, you need to cut off the load of the battery and put the battery aside for 30mins. Then the battery will automatically recover itself to normal voltage (>20V) and can be used after fully charged.
\nIf the battery is unable to recover itself after above steps, please try activating by one of below two methods. After activated (voltage > 20V) and fully charged by normal charging method, it can be used normally.<\/em><\/p>\n


\nMethod \u2460 Connect a 36V solar panel directly to charge the battery without a controller for 10~30mins in sunny daytime<\/strong><\/span><\/em><\/p>\n

.
\nMethod \u2461 Connect the battery with a charger with 0V charging function (it can charge the battery starting from 0V) to charge the battery.<\/em><\/strong><\/span><\/p>\n

Here we have been under a large cloud of wildfire smoke since early May. Solar was not an option. Some days I can see the sun through the haze, but my solar panels can’t. I don’t own a charger that can revive dead LFP. My MPPT charge controller was about ten years old, I didn’t have the manuals, and I am sure the company didn’t exist anymore.<\/p>\n

It turned out one of the AGMs was dead. I had my old dead van battery sitting in the battery room. That and the almost functioning other AGM that I hoped would do the job. I hooked them in series as best I could with what wire I could find. I measured the voltage, 19 volts, and that was after charging.<\/p>\n

I repeated what I saw in the video. I connected the neg cable to the neg on the LFP and just touched the positive for a second. I heard a click inside the battery.<\/p>\n