Additional 6.5kW battery on order
@allyfish - what's the function of the two black rotary isolators at the top?
Have you had that DC MCB installed yet?
Save energy... recycle electrons!
- @transparent black isolators are DC solar PV isolators, two strings, one 4 panel, one 5 panel. I await the DC MCB from L R Renewables by Mail and a date when they will install….
That's interesting @allyfish.
I'm puzzled how a 'knife switch' mechanism can be used effectively with high-voltage DC.
When the circuit is broken by rotating the disc, I would expect the resulting arc to damage the edge of the blade.
Any chance of a close-up photo so we can see the manufacturer and model number of those rotary switches?
For others who are following this, and would like a bit more technical insight...
A typical solar array of rooftop panels in series will be supplying the string inverter with a voltage between 150-500v, with a current of less than 20A.
There are DC-rated MCB-style trips which can be used to handle these voltages.
They have a series of plates arranged as a ladder-network which dissipate the arc.
Such a DC trip uses a pair of magnets either side of the contacts to pull the arc into the ladder when the contacts open.
That's why a DC trip is marked with + and - symbols which tell you which way around it must be connected.
There is no 'standard' for this.
You have to look at each unit to check the polarity.
I do have a rotary isolator on the input to the inverters to comply with the safety guidance, but it is preceded by a DC-trip and a pair of fuses.
The trip is opened first, before I turn the isolator.
Save energy... recycle electrons!
@transparent they are Craig and Derricott EPV252 25A 2 pole rotary isolators. Designed for DC voltage and Solar PV isolation, 25A @ 800V. https://craigandderricott.co.uk/product/photovoltaic-pv-enclosed-switchgear/
That's neat.
And good to see that Messrs Craig and Derricott is a UK company, based in Walsall. 😎
Save energy... recycle electrons!
- 26 Forums
- 2,199 Topics
- 48.4 K Posts
- 75 Online
- 5,854 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Why Air Release Valves and Deaerators are Non-Negotiable
Top tip to fit an isolation valve! All good points. I...
By Old_Scientist , 1 hour ago
-
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face
@editor I hope you have at least a partially working he...
By GrahamF , 2 hours ago
-
@drei are taking measurements from the heat pump, or do...
By GrahamF , 5 hours ago
-
RE: Heat pump and wifi kit connection.
Wi-Fi kit covers any Samsung device that has a modem in...
By Alfapat , 12 hours ago
-
RE: How to Understand Wiring Up a Heat Pump
I’m watched @pirate-rich rewire our wiring centre last ...
By Mars , 13 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@agentgeorge err… Pass! I dunno what caused that! I’ll ...
By Toodles , 13 hours ago
-
RE: Sizing - Save me from my headache
If you get an R290 pump you should be able to heat the ...
By JamesPa , 14 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
@jamespa can you take a pic of the primaries inside the...
By AdamK , 14 hours ago
-
RE: Large heat pump options for church building
@aventus-eco Thanks Sean, will drop you a line.
By Josephiah , 14 hours ago
-
RE: Moving FIT array onto a Tesla Powerwall 3 possible?
@toodles that’s good news for @adamk
By Judith , 15 hours ago
-
RE: Samsung Gen 6 - Schedules not working
@technogeek That sounds very logical :-). I will give i...
By bontwoody , 18 hours ago
-
RE: Who's your electricity provider and what's your tariff?
Considering Octopus states all their electricity is gre...
By AgentGeorge , 19 hours ago
-
RE: Heat Pump + Tado Setup: Smarter Control for Secondary Pumps?
@pirate-rich thanks for the reply. If I were to explo...
By Lloydi , 19 hours ago
-
RE: Seal the Deal: Don't Let Your Heat Pump Leak Energy
@transparent I think the committee might get into some ...
By Toodles , 20 hours ago
-
Samsung ASHP Support in Midlands area?
Hi all, Per title.... can anyone recommend a ASHP ser...
By Andehh , 21 hours ago
-
May I present the maths I referred to earlier when disc...
By Transparent , 23 hours ago
-
RE: RDSAP10 effect on existing heat pump EPC rating?
How many times and dates have epc sap rules been change...
By Tim441 , 23 hours ago
-
RE: Rodents! A word of warning for heat pump owners
I think similar care should be taken against vermin ing...
By Transparent , 1 day ago