1100w from 1000w inverter....for 16 hours.

[Newenough]

I purchased this 1000w Inverter off Amazon for testing my BYD packs. At 1000w they stated in the instructions to limit continuous use at 70% (700w). So, obviously, I completely ignored that.

I ran 3 load test on the system using this inverter.

748w for 46 hours
868w for 38 hours
1100w for 16 hours (ended test early to get batteries recharged before rain)

110% capacity for 16 hours? Never alarmed or falted at all. Cooling fan was kicking on more but that was it. Finally, something cheap from China that surpassed stated performance...

 

[snoobler]

How was the wattage measured?

 

[gnubie]

If the figures are true it may be more of a case inaccurate components not detecting current levels properly and proper lack of thermal management. When it comes to over current detection a lot, and I mean a lot, of the cheap HF inverters just monitor what the HVDC rail or boost circuit is doing. If that voltage sensing is a bit off, there's the extra 100W.

These things not blowing up is often more good fortune than good design.

 

[Newenough]

Hall effect meter/counter and verifying the amp draw with my Klein. I was testing battery capacity (total watts), and cell balance during charge/discharge cycles, not the inverter. That was just unexpected.

 

[snoobler]

What that on the DC input line?

If so, it didn't account for inverter efficiency. Ratings are for output, not input. At peak power, you're probably no better than 90% efficient, so 1100W measured at the input would be about 1000W output.

 

[John Frum]

Darn fine performance especially for the price.

 

[Newenough]

It was on the input side. Did not test for inverter efficiency. Think I'll see how far it will go til it screams. ?

 

[gnubie]

Well, it's not hard to determine that this is obviously not the rated OUTPUT of the inverter. Try measuring what comes out of it.

?‍

 

[Newenough]

That's next....

 

[upnorthandpersonal]

These are from the same factory as the Reliable ones, like the one I got. I've been stress testing mine for some time and they do measure up to their rated power with some margin to spare.