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
Batteries 50V vs 100V
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="Joules" data-source="post: 536940" data-attributes="member: 35656"><p>As DC arcs do not self-extinguish, they can reach extremely high temperatures. A holistic view should really include a fire risk assessment something not covered that I can see under BS7671 Section 712. However, AC arc detection (AFDD) is covered in an earlier section.</p><p></p><p>Some inverters have inbuilt dc arc detection that theoretically disconnects the load thereby extinguishing the arc. The same consideration should really be given to HV DC batteries with a DC arc detection and interruption device interposed between the battery and the inverter. The higher the DC voltage the wider the gap that will sustain the arc.</p><p></p><p>A fire in the roof space can see fire fighters risking their lives by coming into contact with HV DC. I seem to remember a device that attaches to each panel disconnecting it when the fireman switch is operated.</p><p></p><p>Given the controversial risk of fire from lithium batteries they should really be located outside of the building. Charge capacity in LiFEPO4 and the like degrades substantially at low temperatures.</p></blockquote><p></p>
[QUOTE="Joules, post: 536940, member: 35656"] As DC arcs do not self-extinguish, they can reach extremely high temperatures. A holistic view should really include a fire risk assessment something not covered that I can see under BS7671 Section 712. However, AC arc detection (AFDD) is covered in an earlier section. Some inverters have inbuilt dc arc detection that theoretically disconnects the load thereby extinguishing the arc. The same consideration should really be given to HV DC batteries with a DC arc detection and interruption device interposed between the battery and the inverter. The higher the DC voltage the wider the gap that will sustain the arc. A fire in the roof space can see fire fighters risking their lives by coming into contact with HV DC. I seem to remember a device that attaches to each panel disconnecting it when the fireman switch is operated. Given the controversial risk of fire from lithium batteries they should really be located outside of the building. Charge capacity in LiFEPO4 and the like degrades substantially at low temperatures. [/QUOTE]
Insert quotes…
Verification
Post reply
Green Renewable Energy Forum
Solar PV Forum
Batteries 50V vs 100V
Top