I feel that it is best to maintain a 1.5% voltage drop on the AC and DC.
However, I was just sizing conductors for a 400 KW project, with the array
1000' from the main service panel. With AC modules, I would have needed
5-Parallel runs of 700MCM at 208VAC (20 wires at 700MCM for 1.5%VD!) The
August,
Thanks for remembering which SolarPro had that article.
As an installer you can always claim that larger wire will make the
system more efficient. The question is: does it make sense to put in
larger wire? There is always a point where the extra copper is more
valuable the extra ene
Sorry Jay... Missed your post.
>From what I understand we changed this between 75 and 76 because of
popping in and out of sell. Ignoring the Temp compensation for Selling
allows the inverter to be a bit more predictable.
Steve Higgins.
Sr Application Engineer.
Sub-Saharan Afric
All of us agree our goal is to increase total production and reduce cost of the
system over its life. Basically : total lifetime KWH production / total system
cost.
If I can increase the production for the dollar spent by using bigger wire,
I'll do that, and if it makes more power for the mone
Hello Ray,
I agree with Bob-O. Smaller wires between the inverter and the grid may meet
ampacity requirements and your I2R design goal, but high grid-tie voltage
has been a problem. Also, 1% of lost power over the life of a PV system adds
up especially when grid power continues to go up in pric
Thanks August,
I think the SolarPro article makes my point with a decent example of the
calculations. PV is expensive, Copper is expensive. Optimization makes the best
use of both limited resources.
The 5% max volt drop, is not a code requirement, but a fine print note, or
suggested good pract
Hi All -
It seems to me that there is indeed a rather simple set of calculations that we
can run to determine costs and benefits of wire sizing. Solar Pro 3.2 (Feb/Mar
2010) has a good article on this on page 16.
http://solarprofessional.com/issue/?backissues=1
-August
August Goers
Luminalt
Ray,
Sorry, I'm not buying that argument over a 25+ year design lifespan. Also, -and
perhaps something many folks don't consider- the NEC requires a MAX loss of ≤5%
over the ENTIRE circuit. That means all the way to the mains panel. Best
practices would require no more than 1.5% VD between the i
Check out Solar BOS. They built a 15 circuit box for us. Very well done.
http://www.solarbos.com/
Holt E. Kelly
Holtek Fireplace & Solar Products
500 Jewell Dr.
Waco TX. 76712
254-751-9111
www.holteksolar.com
- Original Message -
From: Marco Mangelsdorf
To: 'RE-wrenches'
Sent:
Marco,
PV Powered makes a 16-circuit:
http://www.pvpowered.com/intellistring-commercial-monitoring.php
Brian Teitelbaum
AEE Solar
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Marco
Mangelsdorf
Sent: Wednesday, April 07, 2010
Anyone know who makes a 30-circuit combiner in a NEMA4 non-metallic or
stainless enclosure with a string-level monitoring capability?
Thanks,
marco
provision_highres_solar_logo2 with C-26351
Marco Mangelsdorf, President
69 Railroad Avenue, A-7
Hilo, Hawai'i 96720
(808) 969-3281, 934-7462
I'm beginning to picture a standard combiner box, but with some interesting
additions to the output: supplementary breaker, DC AFI.
I wonder how close to short circuit current you could suzette supplementary
breaker, without it nuisance tripping? Normal operation should be operating the
arra
Kent,
One of the things to take a look at and to make sure that your
inspector is aware of is the last paragraph of Section 90.4. This was
brought up at the last code meeting to allow new products to come on-
line and to implement new technology into the market. Due to the
timeliness of c
13 matches
Mail list logo
