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@OCMerrill I started at 13.9v and applied the heat gun twice to discharge the battery to about 13.0v. The battery tender was able to return the battery voltage to 13.8v without any interruption. I would think your system should work, I would look closer at the battery health, but that’s all...

One thing I am noticing is that with no load my inverter fan is running a lot after applying the heat gun to draw down the battery. It’s hot in chandler AZ and the thermostat on that inverter must not like it. That fan will zombie away quite a bit of that 4.5 amp charger.

If you have a good lead acid battery you might swap it out and make sure something in the lifepo4 BMS or capacity isn’t confusing the charger…

I added a 1500 watt heat gun to speed up the test…

I plugged my garage door into this experiment and I will let you know how the battery tender behaves for the next few days

What is the 16w showing on your picture of the inverter? Idle consumption?

I set this up to compare the standby power consumption… I will draw it down to about 13v like your picture and then connect the battery tender to see if it can properly charge it back to +13.8v like you are attempting.

If that inverter is drawing 16watts in standby…. That will fully cycle every watt of your 1200 watt hour battery in 3 days having done nothing.

I set this up for you. This battery has been sitting off the charger for a month and holding 13.9 Here it is when I apply the charger… 14v

Also check how much the draw is on the inverter. Most of the cheap Chinese inverter draw a lot of standby power. So you will always see that voltage drop as the inverter is drawing power while it is doing nothing. That’s is using up the cycles on the battery. I have some of those inverter...

There is no “maintenance” charge on lifepo4. You do not float charge them or anything other than apply the end state voltage that you desire IE 13.8 on a 12v battery. I would remove the battery and fully charge it. Then remove the charger and validate that the battery is at 13.8 ish. Then...

I appreciate all the opinions given here, it helped me put it right where I needed it to be gone fast. That’s always my goal, price it right and send it down the road pronto…

@NicPaus knows what they are worth

Yes

Sold…. On Facebook marketplace in 4 hours

I have been thinking about towing my Sundancer to the Chicago/Great lakes region in the summer... Then I can just do a week or two at a time and move it on the trailer to the prime destinations. I could trailer it and store it an get on a plane and do other things when I want to also. I...

Kbb doesn’t include the bed slide so maybe I get the top end private party. If you ever had a shell with a long bed, the slide is the best. I almost want to move it over into my newer truck.

I think you are right where I am on it…

Original owner 2005 Silverado 2500 4x4 6.0L LQ4 gasser with factory 4:10 locking differential. Cognitio front suspension with steering upgrade. Deaver progressive rear leafs. 33 inch tires. 198k original miles on original motor, transmission. ARE mid rise shell all windows open Cargo slide...

Without DR, oak is about my limit… I can make a little bit of ice but not enough for coolers