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True, although it's not like there are not plenty of locations with a lot of rooftop PV to learn from.

It won't run on anything other than the supported hardware listed on their website: https://solar-assistant.io/help/getting-started/prepare-device

Whatever commercial / financial structures are put in place, in the end physics has the final say. As I said earlier, 1:1 net metering is incredibly generous. As an incentive to kick start the addition of some renewables it might have made sense but it really needs a sunset clause/date. In...

Physical efficiency and financial efficiency are different. 1:1 net metering has 100% financial efficiency. But the grid has losses too, depends on the distance the power need to travel. Typical transmission and distribution losses on our grid average out at ~7%. And here in middle of the day...

It that much cheaper than a mini cement truck delivery? Or would that be less than a minimum delivery amount? I know nothing of these things, just curious.

Search the forum, there are several threads on the topic of using excess capacity.

For example, this my last 3 days showing load (red) and PV output (yellow) showing how my load control makes good use of PV: I have a smart PV diverter for the electric water heater, an off-grid battery where charging is managed, and an EV with smart charge control, also to maximise use of...

You need to find some discretionary loads which can be shifted to daytime. The most obvious candidate is heating water / hot water storage. Another is an electric vehicle.

Old thread but for this you want an aircon with DRED control. e.g.: https://www.daikin.com.au/faq/what-demand-enabled-response-dred Sometimes it's an add on card which is designed for utilities to be able to throttle down the power draw (without changing the temperature set point). DRED control...

This ↓ Put another way, a battery is a net consumer of energy. No point losing 10-15% of the energy going via a battery when you can buy it from the grid at the same rate you get as credit for exporting. 1:1 net metering is ridiculously generous. If you have it then the only reason to have...

They could use a different, more reliable, service.

You are right in that battery SOC should not have such large steps. Something isn't right with the battery monitoring or BMS SOC calibration. They can drift and not be completely reliable. Perhaps consider installing a Victron smart shunt and monitor that instead. This is mine over last few days:

Have you asked Solar Assistant help?

https://hackaday.com/2017/08/17/living-on-mars-the-stuff-you-never-thought-about/#:~:text=In%20the%20case%20of%20Mars,build%20up%20different%20charge%20amounts.

Plug in an ethernet cable?

Use the backup feature: https://solar-assistant.io/help/historic-data/backup

I outgrew using my RPi4 for Home Assistant, it just didn't have the grunt, storage or backup capability I felt important as Home Assistant grew and became more important to our home's operation. I migrated to a mini PC using Proxmox to set up virtual machines, one of which is Home Assistant. I...

After runners eat, they fartlek.

The jokes here have taken a step down.

What EV has 200p? Most are 400 V and some 800 V architecture. How can they be 200p? You need 100 cells (or more) in series to get 400 V.

My EV's pack configuration is 104s1p. ~400 V architecture. NMC.

Thanks but science it is not. Just data to be treated with due caution. Real science is far far more rigourous. I have 400 Ah of SLA @ 48 V so 0.1C is ~ 2kW so I think I'm fine on that front. The hybrid bank doesn't charge any faster than ~3.6 kW and that's while the LiFePO4 are taking the vast...

This is what's confusing about your posts. You talk about wanting "UPS" or outage back up: That's a use case where there is bugger all cycling. Hence why suggesting batteries designed specifically for that use case. The batteries sit there at float ready to supply energy when you need it. There...

I'm not convinced large vs small battery is much different from a fire risk POV. A devastating fire can be started with a match, it doesn't need a flame thrower. Most battery fires are caused by small battery failures, usually a charging fault because everything is made cheaply. And yes, the...

When I built a system purely for grid outage backup I went with pre-loved SLA data centre backup batteries (Enersys SBS 190F). Four of those for a 48 V system to begin with, then added another four in parallel later. That gave us about 12 hours of comfortable backup capacity, longer if we were...

Not really, prices are not really all that different here. I looked at DIY but frankly the server rack units I have I could not build DIY for much less, let alone the quality of construction and superior form factor. The small cost difference just wasn't worth it and I could get a battery...

Buy nothing critical / expensive from AliExpress. It's the wild east and chances are you will get screwed. Alibaba yes (if the seller is well known/trusted to you). Your use case is confusing. If a battery is for back up and not going to be cycled, then I'm not sure lithium is the right...

A Tesla Powerwall 2's RTE is 89%. That's about as much as you can expect from an AC coupled battery.

Yes, a faulty pre-made battery. Had pouch cells in 16S4P even though the product was supposed to be prismatic 16S. https://diysolarforum.com/threads/wow-basen-rack-mounts-batteries-destroy-a-home-in-germany.71959/post-986648

My 3-phase Fronius string inverter has an efficiency rating of 98%.

https://www.seplos.com/seplos-vertical-48v-230ah-lifepo4-lithium-phosphate-battery-pack-diy-kits-assemble-box-without-cells.html

I see nothing wrong with having two levels of overcurrent protection, one for low level events to provide basic overcurrent protection as well as one which can handle a much more severe fault (e.g. a battery short). Surely that depends on the quality of the breaker? Aside from fuses I use one...

You're allowed to have a fuse and a breaker. Breakers are very handy for taking a battery offline if required.

The charge/discharge - voltage curve for LiFePO4 is very flat, which means voltage is a poor reference for state of charge, excepting at the very top and bottom. Below 3.0 V / cell there is bugger all capacity left, above 3.5 V / cell there is bugger all room left to take more charge. Do not...

Both DIY batteries. Not clear to me from the photos I've seen on the OP's build thread whether the individual cells had an isolation barrier between them. It does not appear so: I noted they reported leaking cell a couple of years ago. Perhaps a portent of other issues...