Does anyone know how much wattage the block heaters use for the CRD? I'm thinking about buying an inverter for those times I have to park the jeep away from an outlet in temps below freezing.

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2005 CRD 2.8L
GDE Eco Tuned
Weeks Stage 1+2
Suncoast Torque Converter
2.5" custom OME/JBA lift
Kennedy Lift Pump
Racor 245R122 fuel filter system
Model 001 Thermostat 41603
Iron Rock Tri-link

400.

But what would you power the inverter with? It would draw your battery down so low it would make starting harder, rather than easier.

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2005 CRD, owned since new.
GDE Hot tune, 2.5" lift w/JBAs, 235/85 Duratracs, Weeks2 kit, Provent, Facet lift pump, Cat fuel filter

400W is the correct answer, as stated above.

So... Where are you, and how do you think an inverter might be able to help?

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2005 KJ CRD Limited 4x4:
245/75R16 BFG TA KO2s
OME / Clevis 2.5" Lift
JBA Lifted A-Arms
IRO WJ Short Rear UCA/WWDiesel mount
Skid Row Skidplates
HDS Model 001 Thermostat (190°F)
Suncoast TC
Full Weeks Kit
Bosch 5V glow plugs
Hayden 2986 fan clutch / GM 11-blade fan
Samco / Sasquatch Intake Hoses
Carter in-tank pump
Provent 200
V6 Airbox

You are never going to heat your engine properly for starting using a battery and a converter to connect to your block heater... your battery will draw down on current long before the frost is off of your engine.

The better way to go is to install a TSL17 12V diesel fueled Webasto heater; also known as a Thermo Top C. The universal installation kit part number is 923369.

Advantages:

1) 5.2 KW of power; fully 12.5 times as much power as your block heater. The TSL17 is designed to heat 4000 lb commercial diesel engines, so it is not going to have a problem with your 650 lb R428. It is thermostatically controlled so you do not have to worry about overheat situations. You can heat up your R428 to about 170 degrees in -20 degree weather in about 40 minutes with a properly installed TSL17.

2) No plug ins required... ever. Webasto heaters are great for camping, fishing or hunting.

3) No idling to warm your engine up; the TSL17 will do a better job of warming your engine than idling it. Using a Webasto instead of idling to warm up will save fuel, wear on the engine and engine oil fouling. I also believe you can use a Webasto heater in no idling zones.