Forum Discussion

kmb1966's avatar
kmb1966
Explorer
Apr 25, 2017

Do I need to change out my converter?

I have a Magnetek 7400 series (7445) converter.
It seems to be working fine, but I am considering upgrading my batteries. possibly going with Trojan AGM batteries instead of Walmart marine 12 volt batteries.
Do I need to change my converter if going with the AGMs?
Do I need to change my converter regardless of AGM or not?

The specs on my Magnetek 7445 are:
DC Output: 14.00 volts for 13 hours with "T Option", then drops to 13.5 volts charging.
(T-Option is the timer where after being plugged in, it charges for 13 hours at 14 volts, then drops to 13.5 volts)
45 Amps
  • Easy to add a Trik-L-Start combiner to maintain the chassis battery when the house is being charged.

    And yes replace that 7445 with something like PD4645. May want to go as big as 80 amps rated but you would need to review the wire size on the charging loop.
  • msmith1199 wrote:
    I just recently did some research on my inverter/converter and one of the things I found is that there is a setting to set it for wet cell, AGM, or a third type which I forget right now. Mine (like I'm sure yours does too) charges both the chassis and the house batteries. But there was no way to change the setting independently for the two battery banks. What that tells me is if I were to change to AGM batteries for the house, I'd also have to change the Chassis batteries to AGM.

    I understand what you are saying. I don't think my converter charges my chassis battery. It only charges the 2 12-volt batteries. When the engine is running, I have verified that the engine running does charge the chassis battery and the 2 12-volt batteries. When the generator is running, I think only the 2 12-volt batteries are being charged, not the chassis battery. In summary mine currently works as follows:
    Engine Running: Chassis-YES Coach batteries: YES
    Onshore Power: Chassis-NO Coach batteries: YES
    Generator power: Chassis-NO Coach batteries: YES
  • I just recently did some research on my inverter/converter and one of the things I found is that there is a setting to set it for wet cell, AGM, or a third type which I forget right now. Mine (like I'm sure yours does too) charges both the chassis and the house batteries. But there was no way to change the setting independently for the two battery banks. What that tells me is if I were to change to AGM batteries for the house, I'd also have to change the Chassis batteries to AGM.
  • My charger is not the same as your but it is programmable for either wet-cell or AGM. That tells me there must be a difference. See if it is possible to change the type setting. OBTW if I had to buy a new charger/inverter+batteries.I would get one that would do lithium batteries. AGM is no longer the best technology out there.
  • Ivylog's avatar
    Ivylog
    Explorer III
    AGMs can be charged as high as 14.6 V so no need to change other than 45 amps will take a while to charge if you have more than two batteries.