What is the real power of a generator

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Discussion Overview

The discussion revolves around the power output of a Subaru 1700i inverter generator, specifically focusing on the DC 12V output and its potential use with an inverter to convert to AC 240V. Participants explore the generator's specifications, the feasibility of using the DC output for powering devices, and the implications of doing so.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant reports that the AC 240V output of their generator is not functioning, while the DC 12V output is operational, which is labeled "Only for battery charge."
  • Another participant calculates the maximum power output of the DC 12V as 99 watts (12V * 8.3A) and states that the AC output of 1700W does not apply to the DC output.
  • There is a suggestion that using the DC 12V output with an inverter is inefficient and that practical limitations will reduce the usable power to around 75W due to energy loss in the inverter.
  • One participant speculates about the possibility of using a 240V inverter to transform the 12V output into 240V and questions whether the power could be as high as 1700 watts, but acknowledges that the 8.3A rating is specific to the 12V output.
  • Concerns are raised about the risk of damaging the generator by using the DC output for purposes other than battery charging.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and safety of using the DC 12V output with an inverter. There is no consensus on whether this approach is advisable, and participants highlight the limitations of the generator's specifications.

Contextual Notes

Participants note that the generator's DC output is intended for battery charging only, and there are concerns about the implications of using it for other purposes. The discussion includes calculations based on the generator's specifications, but these calculations are subject to practical limitations and assumptions.

Ebay_Dreamer
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I have problem after purchasing a Subaru 1700i inverter generator on ebay. The AC 240 doesn't work but the DC 12V works. It is written on the DC 12V "Only for battery charge"

I tried to put a small inverter and a 230W halogen light directly on the battery + and - . The light started to work but suddenly the small inverter suposed to transform 12V into 240V start burning and was blow off.

I have decided to buy a stronger invereter. I found one 1500W on ebay in Chine for only $50. I hope it will work.

My question is: What is the power of my generator if using the DC12V exit. It is written on the generator 12V 8.3Amp. The generator is supposed to provide 1700W using the AC 240.
Do you think it is a good idea to use the DC12 and add an inverter at the end ?
thx,
 
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Ebay_Dreamer said:
I have problem after purchasing a Subaru 1700i inverter generator on ebay. The AC 240 doesn't work but
I would think you should return it to the seller for a refund, unless its description included "does not work". If the seller does not want to refund your money, notify ebay that the item did not work and ask for their advice. (They probably have a FAQ covering this.)

My question is: What is the power of my generator if using the DC12V exit. It is written on the generator 12V 8.3Amp.
12*9.3 = 99 watts (maximum)

The generator is supposed to provide 1700W using the AC 240.
1700W relates to the AC outlet. The DC outlet is rated for only 99W.

Do you think it is a good idea to use the DC12 and add an inverter at the end ??
That is not an efficient way to obtain 240V. And it can never supply more than about 75W, because in practice the inverter loses some energy.
 
Thanks for your answer. No Ebay return because it was said spare and repair No return.
I really got it cheap for only $50 so not a such bad deal.

If I plug a 240V inverter which will transform the 12V into 240V at the exit of the DC 12V.
Is the 240V power still around 100 watt or could it be 240*8.3= around 1700 watts.
I was thinking that it would be for each Volt 8.3Am/12V=around 0.7amp for each volt and therefore for 240V around 150W.
I was dreaming it could be 8.3Amp * 240V but it seems that 8.3Amp is for 12V and not for each Volt.

Anyway, I have found in the neighborhood a friend who know a mechanics who said it could be fixed for only $50.
I have also purchased an 1500 watts inverter and will post here the result of my test. I will plug the inverter in the DC and switch on as many halogen bulbs as it could. This could be stupid but maybe the Amp will go up if more demand. I am only afraid to blow up my generator if using the DC 12V and not the recommend 240 V plug !

Do you think it is a risk for the generator to use the DC 12V with an inverter for running lights because it is written on the generator that the DC 12 should only be used for charging battery ?
 
Last edited:
Ebay_Dreamer said:
If I plug a 240V inverter which will transform the 12V into 240V at the exit of the DC 12V.
Is the 240V power still around 100 watt
yes
or could it be 240*8.3= around 1700 watts.
never

Anyway, I have found in the neighborhood a friend who know a mechanics who said it could be fixed it easily for $50. Hope it would work
If the damage was in the item before it was shipped, you may be able to get the cost of repair refunded by the seller. Email and ask first, before you post negative feedback.
 

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