Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Green Renewable Energy Forum
Solar PV Forum
Solar System Review
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Talk Electrician Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Barx" data-source="post: 528536" data-attributes="member: 121"><p>Bare in mind that reading the voltage on the inverter like this is NOT Voc. 'in circuit' voltage which will always be lower that open cicuit voltage.</p><p>Not sure about that particular inverter but some inverters you can turn the AC supply off and the inverter is still live and you will get a voltage a bit closer to Voc. </p><p></p><p>Is 1 string in the sun and 1 out the sun? temperature tends to affect voltage, panels don't like to be hot. That could explain the different string voltages.</p><p></p><p>The only real way to get the right number is to open the circuit, but you can only really do this if you are compentent to do so. i.e turn off dc isolator, then either a) open DC isolator and test incoming cables at the terminals or 2) disconnect DC plugs from inverter, connect test leads to then and turn DC iso back on.</p><p>DO NOT disconnect the plugs under load without turn isolators off first.</p><p></p><p>Also note, DC power stings quite a bit and is more dangerous than AC. So, if you decide to faff, please be very careful.</p></blockquote><p></p>
[QUOTE="Barx, post: 528536, member: 121"] Bare in mind that reading the voltage on the inverter like this is NOT Voc. 'in circuit' voltage which will always be lower that open cicuit voltage. Not sure about that particular inverter but some inverters you can turn the AC supply off and the inverter is still live and you will get a voltage a bit closer to Voc. Is 1 string in the sun and 1 out the sun? temperature tends to affect voltage, panels don't like to be hot. That could explain the different string voltages. The only real way to get the right number is to open the circuit, but you can only really do this if you are compentent to do so. i.e turn off dc isolator, then either a) open DC isolator and test incoming cables at the terminals or 2) disconnect DC plugs from inverter, connect test leads to then and turn DC iso back on. DO NOT disconnect the plugs under load without turn isolators off first. Also note, DC power stings quite a bit and is more dangerous than AC. So, if you decide to faff, please be very careful. [/QUOTE]
Insert quotes…
Verification
Post reply
Green Renewable Energy Forum
Solar PV Forum
Solar System Review
Top