two arrays [RE-wrenches]

[Darryl Thayer]

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Hi Kent and others
Good observation, but I have several 72 volt nominal
arrays on an MX 60s.  IN fact I have 13 MX 60s that I
have seen 120 + volts OC in the winter. I have one
other that has 144 volts OC in the winter for at least
3 years.  All my experiance is for 48 volt battery
systems however.
Darryl 
--- Kent Osterberg <kent at coveoregon.com> wrote:
> Lee, this combination of modules doesn't leave you
> with very many choices. 
> 
> Option 1: Wire both arrays for 24 volts, using #4
> wire to the new array 
> and loose 39 watts in the wire or use #2 wire and
> loose 25 watts.  Is it 
> worth going to #2 wire to gain 14 watts?
> Option 2: Wire both arrays for 48-volts, using only
> four of the 53-watt 
> modules.  Now you can use #6 wire to the new array
> and only loose 16 
> watts.  But you'll need another charge controller
> and more wire to the 
> old PV array to use use the last two modules.
> Option 3: Wire the new array for 48-volts and the
> old array for 24-volts 
> using separate charge controllers for each.
> Option 4: Get a couple more 160-watt modules and
> wire both arrays for 
> 72-volts.  But that's not a good idea in cold
> climates like Montana.
> 
> Kent Osterberg
> Blue Mountain Energy, LLC


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