3rd battery, Need help
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New User
Joined: Apr 2019
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3rd battery, Need help
Hi all, I have a 2002 7.3 f550. I’m looking for help on this as I do not know a lot about my truck(father gave it to me) and this is not my area of expertise to say the least.
I do not have access to electric at my yard.
I need a 3rd battery with inverter that will charge the block heater overnight. Then during the day have the original 2 batteries charge it back while I’m day driving.
im told i should use a deep cycle battery
does the stock alternator have enough power to handle the 3rd battery?
any advice on products to use without breaking the bank?
thanks in advance and sorry if this is posted already.
I do not have access to electric at my yard.
I need a 3rd battery with inverter that will charge the block heater overnight. Then during the day have the original 2 batteries charge it back while I’m day driving.
im told i should use a deep cycle battery
does the stock alternator have enough power to handle the 3rd battery?
any advice on products to use without breaking the bank?
thanks in advance and sorry if this is posted already.
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
I don't think you can get there from here. Sharpen your pencil, and determine the ampere-hours the block heater draws. Basically I bet you'll find it's going to draw down the battery farther than the recharge capability during the day just driving around. Better off using an inverter type gasoline generator and powering the blockheater with that.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Your idea won't work. The block heater draws near 1850 watts. You would need a true 2000w inverter to run this and the inverter would draw somewhere near 120amps to provide the output. A group 65 battery would be completely dead in less than 10 mins considering most inverters shut off at 10.8volts.
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Your idea won't work. The block heater draws near 1850 watts. You would need a true 2000w inverter to run this and the inverter would draw somewhere near 120amps to provide the output. A group 65 battery would be completely dead in less than 10 mins considering most inverters shut off at 10.8volts.
is there anyway to heat the block quickly without electric?
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Glow plugs,wiring and two batteries were replaced last year. Still has a tough time starting unless it’s 45 degrees.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
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Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
Your idea won't work. The block heater draws near 1850 watts. You would need a true 2000w inverter to run this and the inverter would draw somewhere near 120amps to provide the output. A group 65 battery would be completely dead in less than 10 mins considering most inverters shut off at 10.8volts.
I was just WAG the battery would be completely dead in about an hour or so. 80 amp hour draw say. Maybe not dead, but feelin' the pain real bad.
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New User
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how about a 3800 btu propane heater. If I set it up in the morning Would that heat up oil within the hour?
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
That would help. Starting something on fire underneath the oil pan has a long and noble history. Be careful. A small portable generator should work for you. Something like the Honda 2000 series. Then plug in the block heater and run it for 2 to 3 hours.
FTE Community Team
Joined: Jan 2019
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I agree that it should start with good glow plugs down into the single digits. My 1999 does okay. Sometimes helps to cycle the glow plugs twice.
I'm very curious how this turned out!
Welcome aboard!
I'm very curious how this turned out!
Welcome aboard!
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