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  #1  
Old 09-25-2010, 05:47 PM
amoujaffar amoujaffar is offline
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Default inverter, what's the highest amount?

i wanna add an inverter to my 08 2.3 to run a few things, drill battery charger, various small tools, and possibly a bosch hammer drill, which will require a bit more than anything else.

either way considering i have a factory radio, what is the highest running watts i can get off the stock 95 AMP alternator?

thanks!
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  #2  
Old 09-25-2010, 06:57 PM
Fluffy Fluffy is offline
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Default Re: inverter, what's the highest amount?

ive seen a 14000 watt
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  #3  
Old 10-24-2010, 10:48 AM
demon54 demon54 is offline
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Default Re: inverter, what's the highest amount?

1500 watts out at 120 volts is 8.9 amps on the 120 side accounting for losses (heat ect) that works out to 80 -100 amps on the 12 volt side so I would say 1500 watts would be about the max. Keep in mind that the battery will deliver a couple hundred amp for a short period of time...
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  #4  
Old 10-24-2010, 11:04 AM
FireRanger FireRanger is offline
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Default Re: inverter, what's the highest amount?

Unless you have a very high capacity alternator, that will not work.
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  #5  
Old 10-24-2010, 10:53 PM
demon54 demon54 is offline
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Default Re: inverter, what's the highest amount?

it works on mine with 100 amp alternator, however keep in mind that the duty cycle is relatively low on the order of 40-50%. The most I would ever even consider safe to run is perhaps 1000 watts output at any higher duty cycle, also I dont usually run any accessories with that running.
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Old 10-25-2010, 08:15 AM
FireRanger FireRanger is offline
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Default Re: inverter, what's the highest amount?

The problem is no alternator is ever capable of supplying that rated current at idle. So if you have a 100 amp alternator, you won't get anything even close to that until you bring the RPM's up. Now if you're only using about half that capacity, it will probably be fine as long as like you said, you aren't using other things at the same time.

If someone needs to reliably draw 1500+ watts out of their electrical system, they will need a very very large expensive alternator that probably won't even fit. Or take out the air conditioner and add a second moderately sized alternator. Stock, forget it, not a chance. Also, you can't run that on battery. They aren't designed for that. That multiple hundred cold cranking amp rating is for quick hits starting the engine and then recharging. You can not run that kind of load off of the batteries and the batteries will not be able to make up for a inadequate alternator either.

To put this in perspective, the alternators we use on fire trucks cost in the neighborhood of $1000+ and they're the size of two #10 coffee cans. Even those need to be idled up.
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  #7  
Old 10-25-2010, 10:22 PM
demon54 demon54 is offline
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Default Re: inverter, what's the highest amount?

Whatever, the query was "what is the maximum" and the maximum is about 1500 watts... now the reality is more like 500 which is more than sufficient for a battery charger for a portable drill or whatever.

In my case I run a second deep cycle battery and seldom use more than 500 watts of the available power anyway. However there are times that I need in my trade (R.F technician) that I require more in remote areas. keep in mind that in addition to the cost of the inverter I also have the extra battery and isolator and thirty feet of #0 gauge welding cable for charging and power supply to the inverter. total cost is about 500$ here in Canada. probably not equitable for casual use but a workable system for my needs.

To supply current at 120 volts you require 10 times the input current at 12 volts so 500 watts out at 120 volts is 5000 at 12 volts under ideal conditions, assuming zero losses which as we know can never be.

'nuff said?
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Old 10-26-2010, 03:45 AM
FireRanger FireRanger is offline
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Default Re: inverter, what's the highest amount?

Yes, I'm not disagreeing with you. I'm stating the facts about our truck's stock electrical abilities.
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  #9  
Old 10-29-2010, 02:27 AM
Ranger Sport Ranger Sport is offline
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Default Re: inverter, what's the highest amount?

Quote:
Originally Posted by FireRanger View Post
The problem is no alternator is ever capable of supplying that rated current at idle. So if you have a 100 amp alternator, you won't get anything even close to that until you bring the RPM's up. Now if you're only using about half that capacity, it will probably be fine as long as like you said, you aren't using other things at the same time.

If someone needs to reliably draw 1500+ watts out of their electrical system, they will need a very very large expensive alternator that probably won't even fit. Or take out the air conditioner and add a second moderately sized alternator. Stock, forget it, not a chance. Also, you can't run that on battery. They aren't designed for that. That multiple hundred cold cranking amp rating is for quick hits starting the engine and then recharging. You can not run that kind of load off of the batteries and the batteries will not be able to make up for a inadequate alternator either.

To put this in perspective, the alternators we use on fire trucks cost in the neighborhood of $1000+ and they're the size of two #10 coffee cans. Even those need to be idled up.
I heard about it when i bought my 1000watts inverter (i never installed it), and it makes sense.

To keep with the thread's topic, and for my personal knowledge, what do you guys think we can power safely for our stock electrical system at idle (lowest power as a base of reference)? I know a 175w will enable use and charge of a dual core laptop, curious to know the limitations.
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  #10  
Old 10-29-2010, 03:26 AM
kable kable is offline
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Default Re: inverter, what's the highest amount?

P=IV

power = current * voltage

P = 90 * 12 max power from alt running at full speed
= 918W

if you were to idle say cut to 460W

minus vehicle electrical say 200W (lights etc all off)

taking the battery into the picture to pick up short excessive loads and a duty cycle of 20% you should be safe up to 1000W

you want a deep cycle battery or two and run it off of those and charge them while driving around. That would be the best way
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  #11  
Old 10-29-2010, 04:23 AM
FireRanger FireRanger is offline
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Default Re: inverter, what's the highest amount?

For laptop charger, you're more than fine. Even those little ones that plug into a lighter plug will handle those. Remember the lighter plug is only a 15-20 amp circuit which limits you to 180 watts right there if you go that route.

At idle, you are very very very limited. And if you start using headlights, wipers, blower, etc you are even more limited. And relying on a 12v battery to pick up the slack from a 13.8v alternator is also not a wise way to calculate anything. Unless you have an elaborate multiple battery system, you shouldn't be factoring the battery into your supply at all. It will bite you in the ass and leave you stranded.
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  #12  
Old 10-29-2010, 08:17 PM
Ranger Sport Ranger Sport is offline
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Default Re: inverter, what's the highest amount?

Quote:
Originally Posted by FireRanger View Post
For laptop charger, you're more than fine. Even those little ones that plug into a lighter plug will handle those. Remember the lighter plug is only a 15-20 amp circuit which limits you to 180 watts right there if you go that route.

At idle, you are very very very limited. And if you start using headlights, wipers, blower, etc you are even more limited. And relying on a 12v battery to pick up the slack from a 13.8v alternator is also not a wise way to calculate anything. Unless you have an elaborate multiple battery system, you shouldn't be factoring the battery into your supply at all. It will bite you in the ass and leave you stranded.
That's good to know!

My 1000watts connects directly to the battery, what kind of equipement could i theoretically be able to use without overtaxing the electrical system in your opinion?
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  #13  
Old 10-29-2010, 08:39 PM
FireRanger FireRanger is offline
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Default Re: inverter, what's the highest amount?

Thats a little too open ended. But at idle you are probably limited to 5-10 amps on the 120v side. Computers, small TV's, etc.
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  #14  
Old 10-30-2010, 04:58 AM
Ranger Sport Ranger Sport is offline
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Default Re: inverter, what's the highest amount?

Quote:
Originally Posted by FireRanger View Post
Thats a little too open ended. But at idle you are probably limited to 5-10 amps on the 120v side. Computers, small TV's, etc.
Haha, had to be open ended because i have no idea what to use it for. I originally bought the 1kw unit for my car to setup a gaming console, big screen lcd etc.. But now with the ranger, i don't see the point to install it.
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  #15  
Old 03-11-2011, 11:21 PM
bahamianbiker bahamianbiker is offline
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Default Re: inverter, what's the highest amount?

If i were you i would go to radioshack and buy an electrical usage monitor, aka tells you how many watts, volts and amps. I bought one and it works great! the one i bought was called "Kill A Watts EZ".Costs about $20. this way you can see what your max wattage a deveice needs. then you know how big of an inverter you need. hope that helps.
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