High Voltage Charge Controller [RE-wrenches]

Tue Aug 27 05:08:48 PDT 2002

Most gracious thanks to all for your suggestions.  Unfortunately the new 60
volt RV Power Products and Outback Power charge controllers (neither which
are not out yet but probably would be before this job goes) are for no more
than 5 modules in series which is still a lot lower voltage than I am
needing. I also am very nervous about using any exotic units from a company
with a very bad track record.  I would really like to get at least 8 in
series for this job.  That comes out to a MPP voltage of 136 which would
work a lot better.  That comes out to 3% voltage drop to move 15 amps 700'
using #2 copper.  Not perfect, but acceptable given the situation.

Another option that I've already discussed with the utility is to bring
primary (7200 volts) underground to nearby the array then set a pad mount
transformer there.  I say underground as the customer does not want any
poles on his property. Then install the inverters and batteries there and
feed 120/240 700' to the house.  That also has it's drawbacks as I would
have to take two runs of 120/240 to the house.  One run fed by the inverters
for back up power and another run for the non-critical loads.

What I'd really like to do is get everything a lot closer to the house.

Thanks for the help

Travis

----------
>From: "Jay Peltz, Peltz Power" <jay at asis.com>
>To: RE-wrenches at topica.com
>Subject: Re: High Voltage Charge Controller [RE-wrenches]
>Date: Mon, Aug 26, 2002, 11:10 PM
>

>Hi All,
>
>RV products has a new ( or really soon) 160v max unit, and Outback has one thats
>125v, with 12,24,48v output.
>
>I am a firm believer in wire, its very reliable.
>
>Jay
>
>Peltz Power
>
>"David Palumbo, Independent Power & Light" wrote:
>
>> Travis,
>>
>> As Jeff Wolfe said Solar Converters has the MPPT units. I am using two of
>> them on my own system. 960 watts per unit at 96 volts 24v output. We went
>> through a couple of false starts with these controllers. Dan was great in
>> getting them to finally work without failing. The present controllers have
>> now been operating for over a year without any problems.
>>
>> Dave
>>
>> -----Original Message-----
>> From: Travis Creswell, Ozark Solar [mailto:ozsolar at ipa.net]
>> Sent: Monday, August 26, 2002 10:37 PM
>> To: RE-wrenches
>> Subject: High Voltage Charge Controller [RE-wrenches]
>>
>> 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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