Thanks for the correction on the type of converter. You don't want the older model shown in time2roll's link. The 60 amp LK is much better than the older PM3/4 type. Has adjustable voltage.
You might get a Boondocker version of the LK anyway, if your order that one time2roll linked, but you might still get the older one actually shown. The LK is better and less money here:
https://www.amazon.com/Powermax-PM3-60LK-Converter-Battery-Charger/dp/B01N4L1B6P/ref=sr_1_8?ie=UTF8&qid=1539118309&sr=8-8&keywords=PowerMax+ConvertersIf you ask Randy at bestconverters which model you would really get, and he offers the new one, then it might be worth the extra price since he has a three-year warranty instead of a two year.
It is hard to tell where things stand with these things at bestconverters right now, while they transition to the new models. I think Randy is calling an LK, an "LC" , but it is not too clear.
Here is how to operate the LK's adjustable voltage mode if you switch it to that mode from its automatic three stage mode. You can switch it back and forth to suit your needs. Para 9
https://powermaxconverters.com/wp-content/uploads/2018/05/PM3-12V-LK-Manual-2018.pdf
