Cooking Beef in the oven using Solar + 2 ESS

3000W almost covered by Solar + ESS 1 + ESS 2

I now have 2 Energy Storage Systems at home:

- My LiFePO4 DIY ESS, which has be running for a year a half

- The AESC / LEAF Modules based one, which is in test for now but very promising - I may build a new ESS with these Modules only, independent from the LiFePO4 one, but using the same Wattson Transmitter info -

DIY ESS - Energy Provider statement shows inverted low & high rate usage for October and December between 2012 & 2013

I have been charging (Forced Charge Mode on my ESS) at night for several months now since there is less Solar Production in winter. 

My last energy bill shows that, compared to last year october to december period, I inverted the usage in low rate and high rate

From Oct to Dec 2012 :  (no Solar and no ESS)

  ->   700 kWh used at night rate (half price)

  -> 1002 kWh used during the day 

From Oct to Dec 2013 : (Solar and ESS with Forced Charge Mode at Night 10:30 PM to 6:30 AM))

  -> 1021 kWh used at night rate (half price)

  ->   734 kWh used during the day

The funny thing is that the amount paid is more or less the same because price per kWh is rising, always ...


For more info on my DIY ESS, check out this other dedicated blog : http://www.diyesskit.com

German " Going Electric " Forum talks about my LiFePO4 DIY ESS :-)

German " Going Electric " Forum talks about my LiFePO4 DIY ESS :

http://www.goingelectric.de/forum/ladeequipment/ladestrom-abhaengig-von-pv-anlagen-leistung-t78-190.html

...

I think it is actually the person who left sevreal commentaries on the DIY ESS blog (at the end), a certain Nico who apparently had the same kind of project going on but left it on the side until he stumbled on my blog"

Here is a the German to English translation:

Re: Charging current depends on PV systems performance

of smarted »Sun 12 , 2013, 08:41

Hello, the idea of the project is not mine and mine also still waiting on completion, which until next winter which is probably because I'm still on charge KEBA project off the adaptive PV. Here the foundations are also equal mitgelegt for the ESS. A central service then regulates the PV charge control of the car and the ESS. while ago I stumbled by chance on the Christophe Hubert and his ESS page. http://myelifenow.blogspot .fr / search / label / DIY% 20ESS Before that, I expected a lot and tested and it was then more expensive. So I have all rejected. But Christophe has then directed me on the right track. I know its a very good project and if anyone has any questions, I will answer gladly. My project but I have a little modified to be more powerful and efficient loading and also not use the Wattson to detect the excess power or the necessary reference power. I refer of ZRZ via IR adapter. Ultimately, the operation of the memory can be explained as follows: An Arduino Borad queries the TST and then controls via relay outputs (there are ready-16x boards) a certain number of inverters or chargers.These are always on or off the network side only. All inverter and charger add up Parallelbetreib. The battery is disconnected via a safety relay (normally). With a Four Range Digital Control voltmeter is limited and controls the charge and discharge.So no more BMS is necessary. before I had a BMS in use, but sold again. On page I have Charger with 90W 2x instead of 8x chargers charging devices with adjustable max. 900W each. The scheme takes the Arduino board before. afford the WR about 220W. Christophe was the first WR converted to 70W to the 0 to get close to and even set a current controller before (rc model sport). But I will refrain. 220W requirement under my system runs at all. before I used the cascading WR, was the smallest in SMA inverters are in the experimental setup. The left is also good control via RS485, but totally uneconomical.The small SUN GT250 are optimally utilized and have an efficiency of about 90%. exactly We is the total efficiency, I can not say no idea. Losses are in each case. The project is economically despite its low price in any case. From the Save comercial I do not want to talk. components and costs:

Re: Charging current depends on PV systems performance

of MoLab »Sun 12 , 2013, 12:49

This is a very ingenious concept! The stage adaptation of the feed power completely enough. Likewise, the single-phase design;. ZRZ the net so all phases 
Do you know how long it takes the GTI to be aufzusynchronisieren after switching? Must See times ... my 
Such a system would also be interested to know real, the 1700W rich indeed to a time delay to load the Smart at night from solar power, and in winter, the CHP still helps. And the facility is nice scalable.

....... And it goes on and on .....

Well, I am happy that some people find my project of interest and will learn that LiFePO4 is READY to be use for Energy Storage and is NOT THAT EXPENSIVE: My LiFePO4 5kWh pack is 1,700 EUR and are GREAT Cells (CALB CA180FI)