[RE-wrenches] Sol-Ark install

[Christopher Warfel]

I talked to SolArk about the input amperage limitation on a recent 
project. Someone correct me if I am wrong, but SolArk does automatically 
limit excess amperage.  We were very close on the limit and it made no 
sense to me that they would design something with parallel MPPT that 
limit one to one string.  In any case, I was informed by SolArk that 
they do current limit when in excess of 18.  Chris Warfel

On 4/14/2022 1:00 PM, Darryl Thayer via RE-wrenches wrote:
> Hi, Ron, Yes, you must be careful of the MPPT inputs.  You state 
> Sol-Ark has an 18 amp max input, meaning you can not have more than 1 
> string supplying an MPPT if your 60 cell modules are 10 amps Isc.  You 
> state Sol-Ark has a maximum voltage per MPPT of 500 volts, this 
> voltage is _not Voc x number of modules._  The Voc must be temperature 
> corrected.  find the lowest temperature for your region, check code 
> book 690.7a table and there is a table of temperature correction 
> factors, use these factors to correct Voc at STC to Voc at your lowest 
> temperature.   For example if your lowest temp is -10 F the code says 
> (x1.2) so your 40 volts becomes 40 x 1.2 = 48 volts and the max number 
> of modules is 10 per string
>
> On Tue, Apr 12, 2022 at 9:42 PM Ron Young via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org> wrote:
>
>     Hi Wrenches, trying to wrap my head around a first time Sol-Ark
>     install. Because the max DC voltage is 500v at 18a  and the PV I’m
>     using is 40v DC each I will have to create three strings each
>     480v. What would be the best choice for a home run wire? I’ve
>     always used smaller strings with micro inverters, a combiner at
>     the array and a single Teck home run cable but the string inverter
>     presents a different scenario and it looks like I’ll need to use
>     three home run cables, one for each string.
>
>     Ron Young
>
>     earthRight Products - Solareagle.com <http://Solareagle.com>
>     Alternative Energy Solutions ~ Renewable Energy Products
>
>
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-- 
             Christopher Warfel
                      ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
                                 401-466-8978
<http://entech-engineering.com>

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