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 3 4 5 ... 10
 1 
 on: Today at 08:51:28 AM 
Started by dan_b - Last post by azps
Although latest capacity is 13.4GW compared to Sheffield Solar's 13GW.  But I can live with that difference.

Sheffield are trying to estimate the total operational PV capacity. That will be smaller than the total capacity that's ever been installed.

The sad thing, looking at that spreadsheet, is just how little growth there's been. The most recent 0.5 GW of installation appears to have taken two years.

 2 
 on: Today at 08:19:26 AM 
Started by dan_b - Last post by brackwell
looking at nat grid transmission it looks like the daytime low will be lower than the previous night/morning low, for the first time this yr?

 3 
 on: May 29, 2020, 11:10:27 PM 
Started by Scruff - Last post by Scruff
60V is the new 48V...much higher resolution.

You can make a 9 cell battery on some accommodating legacy 24v hardware.

 4 
 on: May 29, 2020, 11:07:22 PM 
Started by Scruff - Last post by nowty
Nickel2, I presume you donít have a datasheet for your battery ?
I am making an assumption itís an 8 cell LIFE or LIFEPO4 battery with a nominal voltage of 3.3v per cell which gives 26.4v.
If so, 22v will be down to about 5% or less. Shocked

The datasheet below is for a LIFEPO4 cell, so you want to make sure you are stopping discharge BEFORE the voltage goes off the cliff, not half way down it.


 5 
 on: May 29, 2020, 10:48:46 PM 
Started by dan_b - Last post by phoooby
My best day since installed in October 2018 at 51.53kWh today. Large system at 10.2kw but is mostly north west and north east facing so power from 0530 - 2030 at the moment. Jan and Feb were lower than my first year but March, April, May are all higher and May is looking like 20% more than last year as I should be over 1.2MWh for the month. 

 6 
 on: May 29, 2020, 10:25:25 PM 
Started by dan_b - Last post by marshman
9kWp system, itís east/west tho so will never get that figure (closer to 6)

So approx 102-150kWh/kWp With 2 days left.

East west can be quite good, flattens the curve so to speak and gives good output late in the afternoon/early evening when you are more likely to self use. My SE facing system dies late afternoon. Wish I could get a 9kW system🙂

 7 
 on: May 29, 2020, 10:16:21 PM 
Started by Scruff - Last post by Scruff
25.7V would be my lowest cutoff threshold.
Have a look at the graphs on the nordkyn design link I posted you earlier.

A flat LiFePO4 looks like a charged lead acid in terms of holding voltage.

They never stop accepting charge either...they just set fire if you go to far.

You can stay at a regulated voltage and current adjust this takes ages and is the method employed by everything i've tested or you can overshoot on charge voltage at max current and stop at the precisely right moment to have the correct resting voltage. The latter is how I roll. Bulk to 85% then stop and call the last 15% an investment in cell longevity.

 8 
 on: May 29, 2020, 09:27:06 PM 
Started by dan_b - Last post by oliver90owner
In that case it was seven whole weeks yesterday🙂.

 9 
 on: May 29, 2020, 08:45:14 PM 
Started by dan_b - Last post by dan_b
Sorry, couldn't resist.

Just before midnight tonight (29th May, 2020), Britain will have been coal free in its generation mix for 50 days.

Record no coal run continues ...

 10 
 on: May 29, 2020, 08:28:01 PM 
Started by linesrg - Last post by dan_b
The Eddi is a very similar design to the Mk2 ImmerSUN - the original company 4ECO basically was re-born as Myenergi, who also make the Zappi EV car charger.

Their tech support guys are very helpful have you given them a call?

Pages: [1] 2 3 4 5 ... 10
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!