400bird
Solar Wizard
My system is AC coupled and it works as described.
Interesting. I was under the impression Grid Support only worked when the battery voltage was above the Grid Support threshold setting when operating in a DC coupled situation. I'll have to experiment with the settings and see what happens.My system is AC coupled and it works as described.
I was referring to what I said in the previous post:BTW, When you say "works as described" I'm not sure which section of the rather poorly written Schneider operating guide you are referring to. I found some of the information not only confusing but conflicted in some cases. In any case, Thx for the tip.
That's load shave, sure but you could also use "grid support" and program it to push current out to the grid. You could set this at 0.1 amps and it would take you down to 0 import. I've got mine set up to export 1 amp minimum for the entire "peak" TOU time.
Battery voltage must be above "grid support voltage" that is correct.Interesting. I was under the impression Grid Support only worked when the battery voltage was above the Grid Support threshold setting when operating in a DC coupled situation. I'll have to experiment with the settings and see what happens.
I am a programmer and EE by trade, and was curious if you accomplished hacking the SI's over can to do peak shave. Since in lithium battery mode the data is all fed from 500kbps canbus using SMA-NET. ID's 0x355 are required for SOC/SOH but voltage can also be fudged to potentially allow for peak shaving use as you can override the data using raspberry pi or use a microcontroller w/ canbus support to send can data every 100ms to the SI's. Can ID 0x356 has battery voltage, battery current and battery temperature. These ID's are all defined from the pylontech battery bms which feeds the data to the SI's in LI mode. It would seem that these values could be fudged to present an overvoltage condition to trigger TOU grid feedback if you could determine how much overvoltage sent would trigger backfeed in terms of amps. My other idea was to buy a bunch of cheap microinverters - like older enphase - the business next door to me has buckets of them from older solar roof tearoffs. Wire them up to a 110-240v relay on each 110v leg and toggle them on/off with relay board on the ac side using a microcontroller or rasp pi. This would allow you to grid backfeed in 150-170w increments. It would take a bit of effort but totally would allow a legal way to backfeed the grid off of lithium, agm or lead acid banks @ 48v and would be UL certified too in terms of the grid interconnect.I was referring to what I said in the previous post:
Battery voltage must be above "grid support voltage" that is correct.
Battery voltage must also be 0.5 volts above "recharge voltage."
Having AC coupled or DC coupled solar doesn't matter.
The issue with Schneider and AC coupling and Grid tie is that it won't look at grid current to adjust charging or initiate charging based on anything but battery voltage. It won't initiate charging at a set time, or grid current.
That's why I don't recommend it for AC coupled solar, unless you're willing to custom program something yourself. I'm using a raspberry pi and GXMnow is using a PLC.
It doesn't work off the shelf.