4 Years of DIY Energy Storage at home

This is it ! Today, on July 7, 2017, it has been exactly four years since my DIY ESS has been used with Solar on my roof :)

No battery problem, no fire, after all the warnings I got back then, and 1050 EUR saved, which is fine because of my rather small 1.2kW solar array

Here is the link of my post this day on 7/7/2013 

http://www.myelifenow.com/2013/07/uni-solar-pvl-sma-inverter-finished.html

And the next day 

http://www.myelifenow.com/2013/07/starting-first-full-day-of-solar.html

A lot happened since then in the Energy Storage field worldwide and it is great to see that more and more people are considering installing this at home

For more details check out my website dedicated to the built of my DIY ESS on http://www.diyesskit.com

My Energy Storage System - DIY ESS - has been running with Solar for 3 Years now and saved me 800 EUR

On July 7, 2016, my home made Energy Storage System, named DIY ESS, has been running fine for 3 full years :)



Link from July 7, 2013 : http://www.myelifenow.com/2013/07/uni-solar-pvl-sma-inverter-finished.html



After several months of building and testing it back in 2012 & 2013, I finally had my Solar panels connected to a working SMA inverter and I have been storing my Surplus Solar Enegry ever since ...
(Solar panels install had been done several before that http://www.myelifenow.com/2012/10/solar-panels-installation-13-uni-solar.html)

During these last 3 years I had no breakdown what so ever, and absolutely no LiFePO4 Battery pack problem using it 24/7 (8 CALB CA180FI prismatic cells)



Today, few days after, it shows that I saved 577 EUR but you have to add 220 EUR approx. that were not taken into account during the first months (Wattson Anywhere portal data gathering came later)
For more details on my last 500 EUR update in April : http://www.myelifenow.com/2016/04/diy-ess-update-500-eur-of-savings.html
So the total savings as of today is 577 + 220 = 797 EUR, almost 800 EUR :)



I also sold few kits online to people around the world during the same period and it is still available here : http://www.diyesskit.com

I will continue using it until I have a Tesla Energy Powerwall installed later .... and the beauty of it is that all the of the shelf components used in it will be sold and bring me a good part of my money back ;)


Links:
http://wattson.energyhive.com/dashboard/diyesskit
http://www.ustream.tv/channel/chris75sf

EVTV Friday Show - December 18, 2015

- Visit from a Russian EV entrepreneur

- Our rebuilt OEM component development bench

- The end of the lithium battery business

- Ultimate Solar System using Tesla Battery Packs by Jason Hughes

Finally installed 2 SunPower Flexible Solar Panels by my windows to catch more Solar Energy

Announced 2 weeks ago, I finally purchase 2 SunPower flexible solar panels of 100W each, from the UK for 100 GBP only
After watching their prices for the last 2.5 years I finally found a good deal and got them right away



The panels arrived few days later, with again a low shipping cost of 20 GBP for both with DHL (very reasonable)



So these panels are made with the famous SunPower high efficiency cells, made in the USA


36 cells : 9 x 4, with standard MC4 solar connectors


and the idea is to install them right behind the wall, outside, between my windows, vertically to catch the reflection coming from the south oriented wall of the building in front of us


Ordered also a 1m long MC4 extension cable on eBay


I also got some chain and rapid connectors form the local hardware store



Extension cable arrived, just before last week end, now I have everything to install them


So I did that last sunday morning, and it didn't take long, because I already had big screws and chains installed by my windows back in 2010, when I installed my very first solar panels (13W each, but 3 of them), which have been charging AGM batteries, used to charge iPhones, iPad, and power a battery charger for radio, Wii, or other home devices ... This has been working well by the way and they are staying in place
I just had to attach the new connectors to the existing chains (holding 20kg each, way more than enough)



Of course these panels need a micro inverter and I got several used ones for my DIY ESS V2 experiments last year, so I used one of them


I is screwed to a piece of chain using a bolts, washers, and all this is tighten very well


I had to drill a through hole in the lower corner of the window and that was not too difficult ...


The Enphase Engage cable can now go directly inside my apartment


All the cables are fitted so that they don't block the light coming onto the panels


Now, after everything has been connected and installed, there was absolutely no sun, and it has been like during the whole week almost, very frustrating ... :(

I was watching closely on wednesday from work using my DIY ESS Live Cam, and saw clearly that the overall solar generation was more than usual: maybe 60-70W more (we are still in winter and my max generation when the ESS is empty, is 250W or so, maybe 280 now that the sun is a bit higher, still low compared to the 1100W I see in summer)


This morning (saturday), I am home for the week end and as soon as I saw a little sun (half sunny/cloudy, I looked at the wattmeter installed on this specific new line, and it only showed 15W (!! that's not possible, the Enphase M215 can not produce this little power)

BTW the ESS is empty by

So I siwtch off the main solar array DC input on the solar electric panel and there I saw that the 2 SunPower + Enphase M215 were producing 80W :) that's better



DC breakers OFF on Uni-Solar Array on the roof


Enphase M215 is blinking Orange, so it is producing and Orange is normal since there is no Envoy Gateway


This is the reflection light I got when read the generation figure


This small meter gives me wrong figures I guess ...

15W


235V


0.18A