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Inverter question

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Inverter question

Unread postby LA_Bolt_Fan on Mon Sep 29, 2008 7:40 pm

Just a thought.......
I have a 1500w gen, and don't really have the dough to buy a 3000w gen for the A/C right now. My generator has 12v output and there is a 3000w inverter at the auto store for about $300. I have attached pictures of my gen. specs. My question is............is it possible to wire the 3000w inverter into the dc output from the gen. to run the A/C??? It would be too easy if it did! :mrgreen:

Anyone tried this??
Attachments
gen 2.JPG
gen 1.JPG
Backpacking one weekend, RV'ing the next!!
2007 Thor Summit 22rb
2000 Dodge Ram Van 2500 5.2L / 3.92 Gear
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Re: Inverter question

Unread postby Zinger on Mon Sep 29, 2008 10:44 pm

I dubt it would work out how many amps is the inverter rated to draw? I would guess more than 15
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Re: Inverter question

Unread postby LA_Bolt_Fan on Mon Sep 29, 2008 10:59 pm

Good question!! Here are the specs..
Vector 3000 Watt Power Inverter


Part Number: VEC051C

Features:
SST - Soft Start Technology
3000 Watt max continuous power
Modified sine wave
3 AC receptacles: Type 2 or 3 prong
On/Off Switch
Over Load protection
High Voltage Protection
Low Voltage Protection
Internal Cooling fan
AC output short circuit protection
Auto reset on most fault conditions
Aluminum case for optimal cooling
Instruction manual
Free 2 year tech support
2 year warranty parts and labor

Specifications:
Continuous output power: 3000 Watts
Surge power capability (peak power): 6000 Watts
DC input / operating voltage: 10 to 15.5 Volts
Output voltage: 120 Volts AC
Output wave form: modified sine wave
Output frequency: 60 Hz
Battery low voltage alarm: 10.5 +/-0.1 Volts
Battery low voltage shutdown: 10.0+/-0.1 Volts
No load current: < 1 Amp
Full load efficiency: 85%
1/3 load efficiency: 87%
AC Output Socket Type: Three Type 2-3 prong
High input voltage protection: 15.5V
Low input voltage shutdown: 10V
Product size (L x W x H): 15.5"x 8"x 3.3"
Product Weight 16 pound

Free shipping on all inverters over 1000 watts!
Backpacking one weekend, RV'ing the next!!
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Re: Inverter question

Unread postby Zinger on Tue Sep 30, 2008 7:20 am

I believe 1200 watts equals about 10 amps but an inverter uses or loses some power in the conversion.
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Re: Inverter question

Unread postby wintek on Tue Sep 30, 2008 3:06 pm

No. The inverter does not make electricity. Assuming inverter was 100% efficient, the most you could get out of it would be 1800 watts.

Watts = volts x amps.
Amps = watts ÷ volts.

For the same wattage, 12 volt current is ten times the current (amps) at 120 volts

Do the math….
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Re: Inverter question

Unread postby LA_Bolt_Fan on Tue Sep 30, 2008 10:44 pm

Math sux! :D
Just curious, What is a 3000w inverter good for?
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Re: Inverter question

Unread postby Zinger on Wed Oct 01, 2008 7:26 am

LA_Bolt_Fan wrote:Math sux! :D
Just curious, What is a 3000w inverter good for?


Draining your battery quickly :o :lol:

I come up with a figure of 25 amps that cant be correct.
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Re: Inverter question

Unread postby wintek on Wed Oct 01, 2008 10:10 am

Zinger wrote:I come up with a figure of 25 amps that cant be correct.


That's correct. The inverter would need an input of 25 AMPS @ 12 volts to be able to produce the 3000 Watts @ 120V.

12 * 25 *10 = 3000
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Re: Inverter question

Unread postby MCBOWERS on Thu Oct 02, 2008 6:08 pm

LA_Bolt_Fan wrote:Math sux! :D
Just curious, What is a 3000w inverter good for?




A VERY large boat w/ about 4 banks of multipiul batteries with tremoundous recharge capibities,
.Actually very common in the newer,world cruising ,all electric boats.
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TV 1977Chevy 1 ton dually crewcab,w/smogless 454,Turbo 400,3.73
TT TC 23QB 2006 w/1200W inverter, 3 step charger,80W solar panel
ACHILLES hard bottom inflateable[12'] w/15hp Suzuki ob,ready to launch
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Re: Inverter question

Unread postby Mike in Calgary on Fri Oct 24, 2008 9:14 pm

When I plug my trailer into a 15 amp, 110 volt outlet, I can run my air on low only and I can run very little else while the air is on. You're going to need close to 140 amps into the inverter at 12 volts just to run the air. I see on the specs for the gen, that it will only supply 15 amps @ 12 volts. I wonder why, then, does it have 2 - 12 volt outlets?
If you want to attempt to run the AC from the inverter, save the genny for recharging the batteries. You're gonna need it. You'll also need to upgrade the battery cabling.
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Re: Inverter question

Unread postby PrivatePilot on Fri Oct 24, 2008 11:30 pm

Math aside (Wintec explained it perfectly) most generators with DC outputs have woefully small current ratings on the 12v side. I see your generator is marked 15amps on the 12v side, which when you think about it really isn't a whole lot - running all the lighting in your trailer probably draws more then that alone.

Best to save up for a new genny over the winter. Sell the 1500 to go towards the fund, and look around Costco - I picked up our Champion 3000w at the local Costco this spring for $249 which was a STEAL. I've put over 100 hours on it since and it's every bit a "champion" - still starts on the first pull, runs excellent, gets good fuel consumption, and even performed well at 10,000# in the mountains. I'd buy another in a heartbeat.
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