Which is the best converter to buy?

Big like group 27 or 8D or L16? You may have more battery than necessary.

If you want 3-stage charging including a low voltage float for reduced water use and maintenance... I recommend a PD4645 as it is designed as a direct replacement.

http://www.bestconverter.com/4600-series-Upgrade-Kits_c_133.html
With simple technical ability this should be an easy self install.

Pirate wrote:
I two rather huge deep cycle wet type batteries. They are about 20 feet from the converter location. The existing converter looks like a parallax 30 amp unit. I never charge using my generator. I'm either driving or plugged in. No boondocking.

You don't need a new converter if you never boondock.

The Parallax unit you have is a 30 amp (AC--120v) unit that may do say 55 amps at 13.8v DC. If you are on shore power forever, that is all you ever need forever.

For that scenario, you should have only one 12v battery and replace it every couple years or so. If you have more battery bank than that, it will need a charger that can go into the 14s and even the 15 volt range at times, like a guy who actually boondocks and needs to keep his batteries alive. You don't need that.

Hi,

Almost any 3 stage converter will work well for you.

I two rather huge deep cycle wet type batteries. They are about 20 feet from the converter location. The existing converter looks like a parallax 30 amp unit. I never charge using my generator. I'm either driving or plugged in. No boondocking.

any brand but wfco. they are junk

Pirate wrote:
I see several amp models. How do I know which to buy?

What is currently in the RV ???? That will lead you in the right direction.

Or call Randy @ BEST CONVERTER

Progressive Dynamics 9200 w/ optional pendant.
I have the 9245 45 amp so I can run it on a 1000 watt Honda. The 1000 Honda won't run anything bigger.

How many batteries? How often do you charge with a generator?
What size wire to the battery? How long?

I see several amp models. How do I know which to buy?

I am perfectly satisfied 2with my Progressiv Dynamics PD9260 with the optional pendant. There are many others that seem to be just as good.

Doug