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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 15 Jul 2012 (Sunday) 11:36
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PWM Sine Inverter for Alien Bees?

 
cbknight
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Jul 15, 2012 11:36 |  #1

Looking for help since I have no clue when it comes to electronics and inverters.

What I do know is Alien Bees require a pure sine inverter....or so the rumor goes.

Long story short (I deleted my long story, so you can thank me later for not putting you through that misery), I will be building my own power pack for my Alien Bees. It will be a cart style system and will be heavy but will also tote most of our gear. Within in will be a stereo system and some other household current electronics outside the equipment we use.

I have access to an endless supply of 75ah sealed batteries so the battery source is not an issue.

Here is my question taking into consideration AB's require a pure sine inverter.

I was given a Tripp lite 1000w PWM inverter. Looking it up it says it delivers a PWM sine wave. I of course figured the P stood for Pure.....but that is not what PWM stands for. While searching for what PWM stands for, I found where this style inverter delivers a pure sine wave, but the inverter page itself does not say pure sine wave.

So what is PWM and is it usable with a Alien Bee strobe?

If it won't work, it won't work. I guess why I am confused is a normal modified wave inverter costs 30-50 bucks. This one shows costing upwards of $200 with a msrp of around $285.....way more than a modified wave and slightly less than top of the line pure sine wave. Also, I see on tripp lite site that they sell pure sine inverters so I guess that answers my question.

But, the issue of a PWM sine inverter hasn't been brought up that I can fine, only don't use a modified wave inverter...aka el cheapo.

Thanks in advance. Below is the information from the manufacturer about the inverter I have.

http://www.tripplite.c​om …iesID=816&txtMo​delID=2905 (external link)


Craig
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kenyee
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Jul 15, 2012 12:55 |  #2

cbknight wrote in post #14719415 (external link)
I of course figured the P stood for Pure.....but that is not what PWM stands for. While searching for what PWM stands for, I found where this style inverter delivers a pure sine wave

No it doesn't.

PWM = Pulse Width Modulation. AKA, stepped sine wave.
It's an engineering term...


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cbknight
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Jul 15, 2012 14:58 |  #3

Pure Sine Inverter For Alien Bees

What Inverter are yall you using?


Craig
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questionmarc
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Jul 15, 2012 15:29 as a reply to  @ cbknight's post |  #4

vagabond


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cbknight
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Jul 15, 2012 15:39 |  #5

questionmarc wrote in post #14720301 (external link)
vagabond

Thanks....that's not an inverter...that's a power pack with an inverter component inside.


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MrScott
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Jul 15, 2012 20:10 |  #6

I've previously used a Samlex 300w 12v inverter w/ an 8ah or so SLA. It worked great, but was damn heavy compared to the VLM I use now. Its not posted, but it is available.




  
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Jomax
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Jul 16, 2012 22:33 as a reply to  @ MrScott's post |  #7

I'm using a 600 watt samlex with a 35 Amp hr battery, works great, I can shoot my einstein at full power with the modeling light on without issues, Heavy as hell though, I have a hook on one end of the box and use it as a anchor for my PLM. Be sure to get a converter that is compatible, here's a link on a very good DIY
http://forums.dpreview​.com …ortable+Power+S​upply&qf=m (external link)


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PWM Sine Inverter for Alien Bees?
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