Any streams running through your land? Hydro is also a possibility for power, and makes a seasonal complement to solar.
These are a fun watch, if nothing else: YooToob
Yes. These periods are only for when you want to override the usual "self-use" behavior (charge from PV when possible and not-full;
discharge to supply house loads while there is still energy in battery; emergency charge from grid if battery gets really low).
Over here in England, I'm charging...
If you can, when one cell hits peak: throttle the charge current (and carry on balancing) rather than tripping out.
That would cut down on the noise from people worried about cell mismatches.
*waves*
RAI-3K-48ES-5G and 2x US3000C
I got the installer to run the backup output down to the under-the-stairs, with the meters etc - because that's where the house DSL and music-server lives. I admit to plugging the espresso machine in there during the one decent powercut of the year...
It would, and would thereby maximize your cheap-rate grid use (modulo your preferred 23:00 start, and leaving your battery full at 08:00).
But I'm not understanding why you want to fully-discharge your battery, at a pretty high rate, starting at 08:00 (per that image)
Did your wifi upgrade remove 2.4 GHz access? You're hosed.
Did it change the Wifi SSID, or the WPA password? The datalogger stick does not know the new info.
If so, and IF the stick is the newer type (has 3 LEDs on the front; the older type has none) :-
You'll need a computer with wifi and a...
There's a good chance it's a unix-like shell in there; it accepts "bat 1; bat 2" as a single command line.
The "log" command can take an argument limiting the number of entries display; default and max is 3.
The "info" and "soh" commands take a battery number.
With my US3000C I see the BMS charge limit drop from 37A to 15A when the State Of Charge hits 90%,
then just a few A at 97 or 98%, then zero. Then, because the inverter appears to (odd choice!) take it's operating
needs of 90W from the battery, a short pulse of 10A or so intermittently.
The...
From the graph, it looks like a Solis - hence controllable with some effort.
Have a look what this guy did: YooToob
I've not gotten that far myself; still feeding a set current from battery 16:00 - 19:00 to dump about 40% of my capacity, and occasionally changing the charge current for the...
I didn't spot it mentioned, so solcast may be of interest - a forecasting site with a free "hobby user" tier access API for PV prediction. There's a Home Assistant integration for it; no clue on Node Red.
Some guy in Scotland did a yootoob on using it to decide when to use an overnight...
Mine also stalls at 90%. I think it's just lying because SOC is a guesstimate until it declares 100% from the
voltage peaking.
The BMS is still monitoring change during that period; watch the charge-current-limit - it steps down in stages.
Surely for a series stack when one BMS cuts off it goes high-impedance (and does not provide a low impedance bypass path)?
That means the whole series stack is zero-current; effectively supplying zero volts into any load.
I don't think your 36V will happen.
What might, however, is that the...
A pair of moles, and hanging on to the body, did the trick.
It now works via the 485 hub.
Next up, getting SolaX on HA to talk via the other port on the hub, No joy so far...
Yup, just gotten one of the Waveshare units, described as "2-Ch RS485/RS232 to POE Ethernet" by Amazon.
The documentation is... difficult. It seems to have a single IP with a single port for the active
(as opposed to web-config) access; I'm stumped so far on how to get to the other port, but it...
Pylontech say to have the newest unit "first" (ie. master for the stack).
I suspect that's to get the latest firmware version being in control, to the extent that it matters.
Isn't that what you want, though? Use that cheap energy you stored rather than basic-rate grid power?
I've set mine for 1kW or so from 2-5 AM for the cheap rate, then it runs the house background loads until/if there's any PV, and I run
a 400W discharge for the peak rate 4-7 PM just to (try...
The points I'd be interested in are
price per kWh
ease of later expansion
compatibility (mainly of voltage) with connected equipment
On the "later expansion" point: I added a second US3000C to my setup. All you need do is ensure the new one
is charged roughly similar to the existing, per the...
The first cut at the automation is:
id: '1711135569910'
alias: Update Solis charge-from-grid
description: ''
trigger:
- platform: time
at: '23:55:00'
condition:
- condition: or
conditions:
- condition: and
conditions:
- condition: state
entity_id...
I'm in the middle of doing that, though aimed at the Flux tariff. Considerably simpler, but could be used as a basis for extending to Agile.
I'm tapping in to the modbus logger RS-485 port for Solis observe/control and to the battery console RS-232 for observe.
For this purpose you wouldn't...
Rather than thermovoltaic + PV, I fancy water-cooled PV. Just to give a bit of a preheat addition to the house heating in winter; keeping
the PV running cooler is a bonus. Sadly:
anything involving a plumber is uneconomic around here
the PV cooling becomes less effective in midsummer, just...
I wonder if the inverter would play ball if I set
select.solax_solis_energy_storage_control_switch : Feed-in priority - No Grid Charging
number.solax_solis_backflow_power : 100
by which I mean
continuous 100W output to grid (assuming house loads do not exceed inverter max, and if there is PV...
Solis 3102, installed last month. Not sure what firmware.
I'm also seeing 68 watts (sometimes 90) draw overnight, as logged for the "Battery Power" graph on the website
(plus a 20 minute pulse every hour or two, to 170W; probably the fridge). The battery (Pylontech US3000C) SOC droops about...
Even the entire 120A would be under 0.5C for a standard 48V pack built from ~300Ah LiFePo4 cells.
If your normal production charge/discharge is 10A, you're not going to be pushing that limit.
Your "short moments" could be an issue; look carefully at how long the inverter/charge-controller takes...
I don't have an ESP32 to hand - but thanks for the pointer
Documenting for anyone else trying this - it turns out that the magic combination is:
- SolaX Inverter Modbus
- "solis" inverter type
- TCP/Ethernet comms
- Modbus-TCP
- Waveshare 2-ch RS-585
- the after-factory-reset config...
Can't tell; I've been exporting, with only a few zero days. No need to import.
I've pushed as much export as I dare into the 16:00 - 19:00 slot, which took a fair amount of devel cycles before I was happy with it.
Seems to be running nicely now.