Amps and watts and stuff...

oldtrack123 · Guru

RE: Amps and watts and stuff...

KFT · Guru

G'day Peter,

We usually calculated the max demand and factored in some headroom for any high start currents. The loads were also measured at peak usage time. We found the regulation was better if the machine was not fully loaded. And there always seemed to be something that had to be added to the essential supply after all that work was done, which was a not allowed for load so I suppose we were building in some future proofing.

larger facilities often had two or more gensets with one specifically for "safety services" eg essential lifts and fire protection systems.

Newer sets have much better control systems these days so can be loaded up a bit more.

frank

PeterD · Guru

GaryKelly wrote:
Blowed if all that a/h watts stuff will stick in my brain. I have a stick blender I use for my toothless diet - smoothies and stuff like that. It's a 250 watter. My house battery is an AGM 105ah and the inverter is 300 watt (max 600). If I use the blender once or twice a day for two minutes each time, will the sky fall in?

Gee there is a lot of waffle produced by amateurs in this thread. Nothing has been mentioned regarding power factor that will increase the required current. You blokes are missing things to throw up big time. Let's get back to the OP.

Gary has a 250 W device that he wants to use on a 300 W continuous duty inverter. I suspect that the motor in it will be a brush type and not a synchronous type. I would think that the 600 W peak power would start the device OK. With the duty cycle that Gary is going to inflict on the inverter I don't think there will be much in the way of overheating. The inverter will close down if it is overloaded.

Gary, you have the equipment there. This is not a case of what size inverter to purchase. Whip up a smoothie or two and see how it works. You will be holding on to the motor part of the stick so you should be able to feel if it is going to overheat when working on an inverter. If it does not like working on your inverter it will probably react the same on a larger inverter.

-- Edited by PeterD on Saturday 7th of December 2013 05:45:42 PM

SnowT · Guru

Regarding hospital Gen set's..

I know of 1 particular hospital location where they Don't have enough Generator power to do what needs to be Done..
- does not help that they amalgamated 2 different hospitals on to the one site and thought that the backup gear they had.. would be enough..

Well the Back-up power they have is NO way near enough, and they need to shuffle the power usage.. The site has 4 set's of HV main's come into the place..

So no, Not all hospital's have enough Backup power..

Juergen

Aus-Kiwi · Guru

You will find the 11kv feeds are possibly from separate substation ? Unlikely they will all drop out . The gen system could be for emergency and lighting ? Much lower load . Not ideal though !!

KFT · Guru

Peter I thought Gary's problem had already been solved.

we were just going OT as this forum tends to do now and then.

and as you would know Pf is determined by the load and we correct it using capacitor banks. It is no hassle we just deal with it.

frank

mr glassies · Guru

hmmmm now wondering if my 3000 watt 6000 watt start up inverter will be enough to run my washing machine microb wave and air conditioner . i have a smaller 1 for smaller demand but it should be ok

dibs

oldtrack123 · Guru

mr glassies wrote:
hmmmm now wondering if my 3000 watt 6000 watt start up inverter will be enough to run my washing machine microb wave and air conditioner . i have a smaller 1 for smaller demand but it should be ok

dibs

HI dibs

With no details of any of those devices,brand /model number, NO ONE CAN ADVICE YOU

BUT unless the AIR con has a soft start feature it is very unlikely you would be able to use it

PeterQ

mr glassies · Guru

aircon is ok its kick start lmdo

dibs

The dog lady · Guru

GARY, I THINK IT MIGHT BE BEST FOR WORLD PEACE IF YOU JUST EAT YOUR BANANA UNMASHED!! biggrin biggrin biggrin

native pepper · Senior Member

mr glassies wrote:
hmmmm now wondering if my 3000 watt 6000 watt start up inverter will be enough to run my washing machine microb wave and air conditioner . i have a smaller 1 for smaller demand but it should be ok

dibs

That will depend on their wattage/amp use and your battery storage capacity. If your inverter is pure sine wave, it will start them all, if it is modified sine wave, you may have problems. You need to work out your usage amperage, storage and recharge capacity, it's not the inverter which will be the problem, it's your ability to supply the inverter with enough energy to convert.