Your batteries will die an early death from never seeing 14.x voltage during a recharge. You need to reach "gassing voltage" (14.2ish) with flooded batts to get the bubbles that mix the electrolyte properly. AGMs require at least 14.4v to recharge.
How early a death? Depends. Does that matter with the cost of new batteries and your budget? Depends. If things are going ok as is for you, you don't need to do anything special.
When you first turn on the charger, the battery voltage "spikes" from 12.x to 13.x. The more Resistance the charger "sees" the higher the spike's voltage will be. Low battery has lower R, and the wires to the battery from charger have R that is added to what the charger sees. Fatter, shorter wire has lower R than longer thinner wire.
Very important is that the charging amps as a percentage of the bank AH size (the charging rate) affects the degree of spiking. Lower charging rate, less spike. If you put a 55 amp charger on a pair of batts at 50% SOC, the spike will be over 13.2 volts. Same 55 on four batts, it could work.
The WFCO needs to see less than 13.2v on start up as the spike, or it will not go into boost. To get it to see less than 13.2v, you must:
- have a low charging rate
- low battery in SOC
- short, fat wiring to the battery.
BUT- to get the low charging rate needed, you will have low charging rate, and a very long generator run time. Too long.
So if you want to see "boost" and want shorter gen time, you can't get there with a WFCO!
The PD will at least get you the 14.4 by hitting the Charge Wizard. Gen time depends on getting enough of an amps size charger for the size of the bank in AH. Now all you need is a big enough gen to run that size charger. And a place to carry that big of a gen.
