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vienna wall build
#11
You write, that you easely use 10 kWh on a night. I suggest that you go through all our things, and try to optimise use, as this will make everything cheaper later. For instance: Pumps can be changed to low energi models, ligths can be changed til LED's etc. Fridge and Freezer can be changed to low energy models also. Going through ALL consumption at the property should reduce your power use significantly, thus you should be able to make do with a smaller PV array and a smaller powerwall etc.
The cheapest energy, is the one you don't use.
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#12
Another option is to add cheap solar panels and connect them to your battery pack via a controller outside of the subsidy. Sometimes you can get the solar panels at a cheap enough price the subsidy "value" can't match it, especially if you install and set them up yourself. What I mean by cheap is close to or below the Chinese wholesale cost, not the European price premium or the 3x - 5x installed price. 80eur for 260W panel, new or nearly new (less than 2 years).

Nice one on the free battery packs, like it.
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#13
I’m having quite large property with golf like lawn which has to be irrigated ever second day. Whole  cycle takes 8h with a 1200w pump...
A smaller pump doesn’t do it. Rest of my house is high efficiency already...

Regarding panels, I will get a feed in tariff for surplus and that’s why I’m going for full subsidy. Subsidy means that you get eur 250,- per kwp as an investment subsidy and a tariff for surplus which is roughly 7 cents instead of 4 cents which you get from your energy company. From that perspective buying used panels does make limited sense.

Regards
Karl
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#14
The one thing to consider is the start load for the 1200W pump as it may be very high due to the water pressure / static head and the 10kW inverter should be ok, but.... Rather than go with a large 10kW inverter I would go for a 2kW GTIL net metering type that allows the grid to take the surge loads and then your inverter provides the steady state energy from the battery pack. This works out a lot cheaper and no risk of your inverter tripping or blowing FET's when you switch two high inductive loads on at the same time.

If you have the ground space, re-work your calculations. Your existing solar can export all it's power (getting paid for) and your non subsidy charges the batteries to drive the 10kWh of pump load. The economics for extra solar need to take into account the higher exports you will get paid for, not just the cost of the additional solar. Incremental solar offsetting 20ct/kWh power load with the solar output price of 4ct per kWh...
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#15
If his irrigation is installed correctly, the pump only turns on once. After that, it runs the entire time the irrigation is operating. So he's only hit with the load amps during that first start up.
This is accomplished by having the zones matched to the pumps gph/lpr delivery and the use of a cycle-stop. My uncle works in irrigation and seems to always talk about whats going on with it. Tongue
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#16
Hi,

I am planning to use the Infini 3phase 10kW inverter in a gried tie setup. The inverter gets data from smartmeter and tries to balance energy consumption from grid to 0. If there‘s a peak it doesn‘t matter because it will only short consumption from grid. The whole load of my house is not going over the inverter directly, so no worries... but thanks for the hint

Karl
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#17
Great, that is the ideal setup in my mind.
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#18
Had to store away in order to clear up my workbench. My son‘s trailer did a good job  Big Grin



15x 80p each 150Ah done + 10x 80p each 133Ah done, 4 more to go and further >2000 cells tested and ready to go into packs. But still no pv :-(

Regards
Karl
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#19
Dude! Put an electric motor on that cart! Big Grin
TheEngineared likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
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#20
Too busy with building packs...   Big Grin
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