Looking For 12v Regulator
SpiderMan Posts: 11Registered Users ✭✭
I have a conflict in our RV between the solar charge controller and a furnace. The Propex furnace goes into an error mode if it senses input voltage above 15v. Unlike some furnaces, the thermostat on the Propex is not a simple mechanical switch which interrupts power, so high voltage is a problem even when the thermostat is in the OFF position. During warm weather (when I don't need the furnace) this isn't a problem since I've got the absorption voltage for our flooded batteries set at 14.6v. But our coach batteries are exposed to the weather with a battery temperature sensor. Thus, in cold weather the charge controller pushes voltage well above what the furnace will tolerate. My only solution so far has been to reduce the maximum voltage output of the solar controller (Blue Sky 2512iX w/ ProRemote). That keeps the both furnace and the wife happy, but leaves the batteries undercharged.
Nothing else in the RV is affected by this problem - only the Propex furnace. I'm looking for a device that will limit voltage supplied to the furnace to about 12 or 13v. It doesn't need to boost low voltage, but simply to "clip" high voltage. Operating load is under 2 amps (the furnace is rated at 1.7 amp, but I've never seen it actually draw more than about 1.3 or so). The device needs to be able to limit the voltage even when no current is being drawn because the furnace will go into an error mode even if it senses high voltage when not running or turned off.
The furnace distributor (not manufacturer) has suggested the following gizmo, but unfortunately the sales page contains mostly hype with few details. Any thoughts?
I've also heard about putting a diode in series with the load to reduce voltage, but it's not clear to me if a diode would limit the voltage when there's no current flowing.