Hi,

I believe you need some sort of master controller to keep them in sync - 
otherwise, I believe, they will drift out of sync over time.

Derek
> This may be a bit off topic, but I have an inverter question:
> 
> I have a couple of APC SmartUps's (computer uninterruptible power 
> supply). I was wondering if the output of these can be linked in 
> parallel (assuming correct polarity and initially sync'ed to grid 
> frequency) to add additional capacity. The reason for this is that 
> they can be had relatively cheap compared to a Trace inverter.
> 
> My hope is to place them between my bio-diesel co-generator (heats 
> the house too) to 1) condition the power and 2) run the house on 
> batteries during low current demand periods.
> 
> I know Trace and some other solar inverters can by bridged together, 
> but how about a UPS? Anyone know if it can be done?
> 
> Thanks in advance!
> 
> Eric
> 
> 
> 
> 
> 
> Biofuel at Journey to Forever:
> http://journeytoforever.org/biofuel.html
> 
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