High Voltage Charge Controller [RE-wrenches]

[Jeffrey Wolfe, Global Resources]

Travis,

Solar Converters offers several different voltage conversion MPPT units. I 
know, as we've fried 10 of them. I know longer have any in the field, the 
longest surviving giving up after about 18 months. (Most lasted btwn 18 minutes 
and 18 hours on one job. It was a long job, which finally was converted to 
48VDC and C40's. Fortunately I'd oversized the wire enough to be ok.)

I'm working with a "prototype" 600VDC system, battery based with an integrated 
600VDC charge controller. Made for a "large" system (10kW array, 30 kW inverter)
System could be grid tied, but cannot sell back. Contact me off-list if you 
want more info on status of this project.

Otherwise, you've about listed the choices. I know there are folks on-list with 
tall pole experience (Kirk Herander at VT Solar Engineering just put a small 
array on a 30' stick for a state well project.)

For a 700' run, you're really going to want to run the system at a much higher 
voltage, not just 100V. SMA's "Sunny Island" system is supposed to allow Sunny 
Boys to feed into it at 240VAC, but that's not ready for UL yet, last I heard. 
Might check with John B about it.

Good luck!

Jeff

Quoting "Travis Creswell, Ozark Solar" <ozsolar at ipa.net>:

> I am designing a job where the array is at least 700' from the house
> which
> is in heavy woods and the customer doesn't want to cut any trees down. 
> Putting the inverters and batteries nearby to the array doesn't really
> solve
> anything either since the system will be grid tied.  That means I would
> need
> to have an AC run from the house to the inverter location then back to
> the
> house again. That's 1400' roundtrip.
> 
> What I would really like is a MPPT charge controller that would let me
> run
> the array above 100 volts with 48 volts nominal output for the battery
> bank.
>  I have heard of several custom made units but have never seen any. 
> Where
> can I get such a thing?
> 
> Or maybe I need put the array on top of a 40' pole?  Anybody done
> anything
> like that?
> 
> Thanks
> Travis Creswell
> Ozark Energy Services
> 
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