Converter-373RD -2020

[Ram Montana High Country]

Wanted to upgrade to lithium batteries. The inverter does not have the LI/LA SWITCH. Progressive Dynamics says there is a way on the converter to change output.

Some disassemble required.

We’ll see.

[rames14]

Best of luck, hope it works. You will love lithiums. Lighter weight, less space, less voltage drop and less time to charge. The only negative is the price.

[Daryles]

I have a PD4575K18LS8 converter. It is not Lithium ready. I have been using it on my Lithium batteries for over two years now. By itself it doesn't quite get the batteries to 100%. Using the Charge Wizard mode button and putting it in boost mode Topps them off.
I also have solar panels with the MPPT set to lithium mode. They also keep the battery topped up.
I have no plans to change the converter.

[Ahdmeyer]

as daryles said you can still charge the lithiums by using the mode button on your PD4575K18LS8 i also changed to lithiums and do not have a lithium ready converter/charger i called progressive and the tec told me either i had to change the unit out which is expensive or i could use the mode button to fully charge the lithiums like daryles said. here is a link for the mode button https://www.progressivedyn.com/wp-co...rd-Pendant.pdf

[Leonard R.]

Originally Posted by Ram Montana High Country

Wanted to upgrade to lithium batteries. The inverter does not have the LI/LA SWITCH. Progressive Dynamics says there is a way on the converter to change output.

Some disassemble required.

We’ll see.

I have the exact same situation with my 2020 3120RL. I had no luck with a phone call and an email to Progressive Dynamics on my converter/Charger. After a ridiculous amount of digging on their website I found a document that shows the simple switch to Lithium. See page 4 of the attached link. I just did mine with a set of needle nose pliers and I should be good to go! Good luck!

https://www.progressivedyn.com/wp-co.../4600_test.pdf

[Leonard R.]

Originally Posted by Leonard R.

I have the exact same situation with my 2020 3120RL. I had no luck with a phone call and an email to Progressive Dynamics on my converter/Charger. After a ridiculous amount of digging on their website I found a document that shows the simple switch to Lithium. See page 4 of the attached link. I just did mine with a set of needle nose pliers and I should be good to go! Good luck!

https://www.progressivedyn.com/wp-co.../4600_test.pdf

I just received a call from a technician at PD. He suggested that it was 100% fine to leave the converter set for lead acid batteries and the Lithiums will charge to 80 ish%. Pushing the boost gives it additional charge for four hours. I will stay with that rather than a constant 14.6 volts as there is no two stage charger with this modification.

[432bartman]

Originally Posted by Leonard R.

I have the exact same situation with my 2020 3120RL. I had no luck with a phone call and an email to Progressive Dynamics on my converter/Charger. After a ridiculous amount of digging on their website I found a document that shows the simple switch to Lithium. See page 4 of the attached link. I just did mine with a set of needle nose pliers and I should be good to go! Good luck!

https://www.progressivedyn.com/wp-co.../4600_test.pdf

Leonard, am I reading this right that on the factory converter we just need to remove the two 30 amp fuses and it will charge lithium batteries? I have a 2019 trailer

[scottz]

No, pulling the fuses is part of the troubleshooting procedure to check DC voltage. In addition to troubleshooting procedure, the document (page 4 & 5) describes a jumper that changes the output voltage. Jumper on L1 side for lithium; jumper on WIZ side for lead acid.

There are a lot of different models of the Progressive Dynamic converters; it appears the 4600 has this option. My PD converter is a 4500; does not have this option; it is lithium only. Some PD converters have a switch instead of a jumper. Verify which model you have.

[Leonard R.]

Originally Posted by 432bartman

Leonard, am I reading this right that on the factory converter we just need to remove the two 30 amp fuses and it will charge lithium batteries? I have a 2019 trailer

Scott is 100% correct that removing the fuses is only for a DC test. Just jump the 3 pin header as displayed to "LI" on the bottom of page 4 to fully charge lithium batteries.

As it turns out, I left mine on "WIZ" which is to charge lead acid batteries. My lithium batteries will charge to 80%, which is fine for my situation. If I am boondocking I have a REDARC 50 amp DC/DC charger set to lithium so that I can charge to 100%.

I hope this all makes sense!