Dial the voltage screw back to 13.00 for temps of (C to F) 95 - 110F
Attach a timer to the AC POWER CORD that powers only this power supply. If temps go above 110F, charge from 1:00AM to 8:00AM
Otherwise it is a lot easier at lower temperatures.
This critter is adjustable. You need a meter and a tiny bit of patience.
On the high side it is good to around -30F for float.
The amperage capability could FLOAT a 12 volt furnace fan.
This machine has gained quite a following.
http://www.ebay.com/itm/12-Volt-33-Amp-Regulated-On-Board-Car-Battery-Charger-/180681552153?pt=Motors_Car_Truck_Parts_Accessories&hash=item2a1175b119&vxp=mtr