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Chris's Build Thread
#1
Hey All,
I am designing a system and collecting components as we speak. I am very excited for this project!
Summary:
- 4.725kW of of solar
- Solar Charge Controller
- DC-AC 6kW Inverter
- 31kWh of battery storage using ~1060 Lithium Polymer Spim08hp 3.7v 8ah Flat Pouch Cells LiPo Batteries (75p14s) 48v
- Batrium Watchmon4 with Longmons
- Automatic Transfer Switch between interverter and grid, with batteries/inverter as priority

Rough Diagram: https://drive.google.com/open?id=1FzDuqm...c-qnPVX4i_
Rough BOM with spec sheets: https://docs.google.com/spreadsheets/d/1...sp=sharing

Notes:
- This will NOT be a typical grid-tie system, so no back-feeding into the grid. It could change down the road though.
- I am going to be using building a CANbus to Modbus translator to turn the charger on/of with the Watchmon and Schneider ComBox.
- Some breakers/fuses might be missing


Parts are trickling in and I working with a solar designer for the PV and an electrician for ATS. More to come!
WuggyBuggy likes this post
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#2
Did you not put this in the Powerwall section on purpose? That is where full builds are expected to go.

What do you mean "not be a typical grid-tie system"? It either is grid-tie, or it isn't.
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#3
(10-22-2018, 07:50 PM)Korishan Wrote: Did you not put this in the Powerwall section on purpose? That is where full builds are expected to go.

What do you mean "not be a typical grid-tie system"? It either is grid-tie, or it isn't.

Feel free to move it to the correct place.

Well, I thought the definition of grid-tie was feeding into the grid with an inverter from the PV array. Since I am not doing that, and merely switching between power sources, I thought it wasn't technically grid-tie. I guess my definition is wrong per your question?
camthecam likes this post
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#4
So you're just making a second electrical panel that is fed by the inverter and putting circuits over to that; or using a transfer switch to change power source from inverter or mains.

This is not a grid-tie, just standard installation Wink

Grid-Tie is a special inverter that takes a DC power source and syncs up the AC output with mains and merges the two together in a safe way. When the mains goes down, so does the inverter as it has no source to control the frequency.
However, there are some inverters that can run in standalone mode. I believe the AIMS inverters can do this; but don't quote me on that.

moving thread since this is your build thread Wink
Proceed with caution. Knowledge is Power! Literally! Cool 
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#5
(10-22-2018, 08:33 PM)Korishan Wrote: So you're just making a second electrical panel that is fed by the inverter and putting circuits over to that; or using a transfer switch to change power source from inverter or mains.

This is not a grid-tie, just standard installation  Wink

Grid-Tie is a special inverter that takes a DC power source and syncs up the AC output with mains and merges the two together in a safe way. When the mains goes down, so does the inverter as it has no source to control the frequency.
However, there are some inverters that can run in standalone mode. I believe the AIMS inverters can do this; but don't quote me on that.

moving thread since this is your build thread  Wink

Yea, I will be using at ATS to switch from inverter/mains. I just wasn't sure if this was still called grid-tie since technically I am modifying how the service comes into the main panel. Thanks for the clarification there, it will help with any utility permitting, etc.

The AIMS inverter has an ATS in it, but only rated for 75A at 120V, 50A at 240V and I have 100A service. So I am building an ATS with 100A contactors which will be controlled by the watchmon4.
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#6
I see you intending the ATS to have storage priority - are you expecting to see an energy cost saving eventually ?
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#7
If you haven't seen these, here's a few videos by Daromer:





jdeadman, WuggyBuggy, hbpowerwall And 1 others like this post
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#8
(10-23-2018, 05:36 PM)Sean Wrote: I see you intending the ATS to have storage priority - are you expecting to see an energy cost saving eventually ?

Yes eventually.

(10-23-2018, 11:00 PM)Korishan Wrote: If you haven't seen these, here's a few videos by Daromer:






I have seen those and incidentally I am using very similar contactors, with interlock. I am not doing any sort of delay though. There will be ~20ms gap between power sources so hopefully the transfer will be make it so devices are not interrupted. I am also using a whole house surge protector to deal with any transients.
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#9
(10-24-2018, 07:10 AM)whoinow Wrote:
(10-23-2018, 05:36 PM)Sean Wrote: I see you intending the ATS to have storage priority - are you expecting to see an energy cost saving eventually ?

Yes eventually.

Timescale ?
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#10
(10-23-2018, 05:36 PM)Sean Wrote: I see you intending the ATS to have storage priority - are you expecting to see an energy cost saving eventually ?

(10-24-2018, 07:13 AM)Sean Wrote:
(10-24-2018, 07:10 AM)whoinow Wrote:
(10-23-2018, 05:36 PM)Sean Wrote: I see you intending the ATS to have storage priority - are you expecting to see an energy cost saving eventually ?

Yes eventually.

Timescale ?

I still have to run the numbers. The idea is that will run on grid very minimally and I sized the battery bank to accommodate.
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