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1000 watt crankcase heater???

G

Greg1959

Well-known Member
I have a 1000 watt crankcase heater on a Cat C-7 diesel.

I;m trying to figure out the AmpHour draw to see if my inverter and
batteries can handle it???


Any suggestions??
 
Hello Greg 1959,

Would be 8.3 amps like dpendzic said watts divided by volts. I am curious, how does it attach to the pan?

Guido
 
Guido- I have no idea about how it attaches to the pan.

I bought this camper that has a Cat C7 350 HP and was trying to figure out the Wattage or Amp draw from the battery banks to see if I had enough power to warm the crankcase.

I'm new to this stuff.
 
Hello Greg 1959,

I installed heaters at work. But they were 150 watts and screwed right into the pan. I had to drill a hole and install the heater adapter. The heating unit threaded into the adapter and protruted into the pan. It was rated @ 150 watts though. I still have one Here somewhere. Your heater rated at 1000 watts has to go outside around the pan? That much power I would think would cook the oil. Can you post a picture, so I can help you?
Guido.
 
a

There is absolutely no way to have enough power in the starting batteries to warm the oil and still start the engine . Use a small portable gas powered generator to plug the coolant heater and the oil heater into. Sometimes the generator can be located to have it’s hot exhaust blowing directly onto the engine , transmission or oil reservoir.
 
The draw would be approximately 8 amps at 120 volts, but 83 amps at 12 volts. You'll also loose a little going through your inverter, so you're probably looking at a 90 amp draw on your batteries. As B+D said, not likely you'll have enough battery left to start, by the time you got the oil warmed up
Pete
 
However, your inverter will be drawing 83 amps from a 12v system or 41 from a 24v system. In addition a few amps more for heat and circuit losses. Does this thing have a separate battery bank for the coach inverters? If not, I would suggest saving all the battery power for engine cranking for cold starts. Only run the engine heater if you are plugged in to a hookup or running a generator.
 
A good rule of thumb is to multiply the amp draw by 10 to get a rough idea of how many Amps the inverter will be drawing from the batteries.

You would need a LOT of batteries to effectively run this heater off an inverter. To run your heater for 1 hour, you would need a minimum of 83 Amp-hours of capacity, and that would drain the battery flat dead. This is HARD on starting batteries, so you'd want to use deep cycle or golf cart batteries. Here again though you don't want to draw them flat dead, generally only down to 50% capacity, so you'd need at least twice as much capacity as you think you need to run the inverters.

Golf cart batteries are about 100 Amp-hours in capacity, but are only 6 Volts. You'd need 4 of them configured to provide 200 Amp-hours and 12 Volts, MINIMUM, for this to run the heater for 1 hour. Then you need to charge them back up, which means either plugging in or running the coach for SEVERAL hours. This is not something you'd want to do to just move the coach across the yard.
 
How will you recharge the batteries between starts? It might be simpler to power the crankcase heater with a small 1500 to 3000 watt portable generator and skip the inverter and batteries.
 
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