Prosport 20 not charging

[larman]

I bought a used prosport20 3 bank charger. I hooked it all up today but it’s not charging. I have 2 house bank sla batteries 500ah and they are currently at 70 percent capacity. The other battery is my start battery. I’m thinking because my batteries are at 13v it is not putting out a charge? I would like to get my housebank to 100 percent capacity.

 

[C lectric]

What specifically is the charger rating and is the battery rating?

What is the voltage AT the batteries AND at the charger outputs? Maybe you have a wiring problem such as corroded wire ends, battery posts, battery clamps. If there is Voltage drop due to poor crimps, dirty or corroded connections then the charger cannot do its job. All of these MUST be clean with GOOD connections and properly made crimps.

I use either a Dielectric grease or known long term electrical products like NoAlox or Penetrox to do the same and stop the corrosion once it has been cleaned off.

Is the wring between the charger and batteries of sufficient size. If not the charger may be backing off to soon if the voltage is to high to soon.
Check the charger output capacity and then check the wiring capacity and wiring length. Maybe , just maybe, the wire itself is inadequate.

And of course check the charger itself for proper outputs.