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@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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