Here is information for you, if you leave your unit plugged in 24/7 and I have done that for the last 4 years, but I use to have a WFCO charger. That is only a 3 stage charger. I changed to a progressive 4 stage. It's a direct fit. I used to boil my batteries down every month, not good. How did that happen, Well I did a test. The WFCO never dropped to float at 13.1 (trickle) it stayed at 13.5. When I switched my Progressive will drop down to 13.1, also every 24 hrs it will go to 14.5 for 15 mins to burn off the plates. It's a true 4 stage converter. IMO WFCO IS GARBAGE. I'm going on 4 years with the same batteries never have taken them out. Never add water because it will not boil out at 13.1. If you read the manual that came with the WFCO it will tell you that it will stay in 13.5 until after 48 hrs it reads no loads. Parasites are loads such as the CO detector and any clocks. So it will never drop to 13.1. Proven fact.
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