navitron
 
Renewable Energy and Sustainability Forum
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Anyone wishing to register as a new member on the forum is strongly recommended to use a "proper" email address. Following continuous spam/hack attempts on the forum, "disposable" email addresses like Gmail, Yahoo and Hotmail tend to be viewed with suspicion, and the application rejected if there is any doubt whatsoever
 
Recent Articles: Navitron Partners With Solax to Help Create A More Sustainable Future | Navitron Calls for Increased Carbon Footprint Reduction In Light of Earth Overshoot Day | A plea from The David School - Issue 18
   Home   Help Search Login Register  
Pages: 1 [2]   Go Down
  Print  
Author Topic: Is AC-coupling more stress ?  (Read 3827 times)
billi
Global Moderator
Hero Member
*****
Offline Offline

Posts: 9073



WWW
« Reply #15 on: March 19, 2015, 04:45:46 AM »

This should work as well  similar to FreddyUK  string combiner , or ?

for about 140 Euro




http://www.fronius.com/cps/rde/xchg/SID-A22DC308-8DD27FB7/fronius_international/hs.xsl/83_17025_ENG_HTML.htm#.VQpSz-EeQpY

Ok .... just for 4 strings  but still ... tidy
« Last Edit: March 19, 2015, 04:56:42 AM by billi » Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
freddyuk
Sr. Member
****
Offline Offline

Posts: 437


« Reply #16 on: March 19, 2015, 09:11:29 AM »

You need to fuse positive and negative cables if the system exceeds the panel limit and requires string fuses.
http://www.homepower.com/articles/solar-electricity/equipment-products/pv-combiner-box-buyers-guide

http://www1.cooperbussmann.com/pdf/1b416a65-f5ac-4730-ab77-9e2faa147945.pdf

The cost of carriers and fuses was crazy but now they are a fraction of the price. All you need is a 16mm drill bit for the glands. Also maybe worth considering lightning protection arrestor which can also clip on the Din rail. It will not stop a direct hit trashing the system but may prevent damage from stray high voltages from a nearby strike around the frames which can damage controllers and inverters.

As regards switching AC immersion loads - I think what you are doing is taking the power from the batteries via the inverter into the tanks? Relay on = 3kw load. What I want is direct feed from GT inverter supply only drawing surplus PV power (ie. less the onsite loads) when battery voltage is (100%) so no drain on batteries but meter keeps running heating cylinders (3 x 3kw) until they are hot and then a final air dump or whatever. I am still learning all this...
Logged
Pages: 1 [2]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
SMFAds for Free Forums
Simple Audio Video Embedder
Valid XHTML 1.0! Valid CSS!