P1000

Charge to 100% everyday, to ensure the BMS can do cell balancing. LFP is not the same as the battery in your cellphone.

The Esybox has a built-in VFD, I suspect that's the "R12000" option OP is referring to... It's much more than just a VFD pump, though, and IMO worth the additional expense.

When you are selling units as fast as you can import them - there is little motivation to improve things for the customer...

Yeah, I checked the warranty wording, and it looks like I was wrong - it does not explicitly state that not using comms voids your warranty.

Do you have a battery balancer in the system?

This is probably the answer. I think there is an issue with the balancing in some firmware versions, and this battery probably never got balanced, though that's just speculation. It could also be one of many other issues, like the welds holding the cell terminals to the busbars cracking, essentially becoming a "dry joint".

That looks like an older model that does not have CAN, so you need the GoodWe EzConverter, which is not made anymore... You could run it in user define mode without battery comms, but that will void your warranty on the Pylontech batteries.

It only became a guest account later, when the posts stopped.

Sounds like it had a loose solder joint that was secure enough to last until you plugged it into the fridge. Either that or an infant mortality on the PSU of the unit. Should definitely be a CPA warranty repair/replace.

It measures the stove current and switches off the geyser when it (the stove current) is above some level. Similar to this: https://cbi-lowvoltage.co.za/sites/default/files/downloads/CBI_ECU_SERIES_DAT_3PAGES_854KB.pdf

There is no claim in the linked article that that is applicable to LiFePO4. I am not disputing the fact that this is applicable to cobalt based lithium-ion batteries.

Those numbers do not seem to match well with current LiFePO4 technology, It's not clear what they are referring to with "LiPO4" in the table, they have one reference in the article to Lithium Iron Phosphate, only to state that the tables are not applicable to them? Besides that, the article gives no substance to your claim that cycling between 20 and 80% has significant impact on cycle life for LiFePO4 batteries.

1. No. 2. No. It is either a shading issue (or heavy cloud coverage) or a wiring or panel issue.

I'll bet your left kidney that the entire control loop is in the DSP in this case, no need for a soldering iron.

MOVs react a lot faster than a fuse. I don't think it's a surge - I'm pretty sure the SNA outputs DC sometimes during changeover. This will blow fuses in devices with transformers or induction motors (like fridges/freezers).

A heat pump is better, as you can run it off a battery more easily. Or put another way: if you calculate the cost difference with the requirement to run off battery, the heat pump is much cheaper.

1. Difficult to say without inspecting the design of the MPPT. 2/3. If you can export, you go on Vmp for the 550V target, as long as Voc is below 650 for all possible temperature conditions. If you cannot export, you use Voc and the 550V target. The MPPT will derate once you go over 550V during operation, so it is not recommended.

No, those are the values reported by the BMS - your inverters cannot reach those values.

I'm guessing the new battery has an issue like a bad cell and is disconnecting either when being charged or being discharged.

Those batteries look like white label Chinese made batteries: https://www.alibaba.com/product-detail/51-2V-Cheap-Price-Hot-Sale_1600684224999.html I don't doubt that it's a local company, just like Hubble...

The X101 is not a LiFePO4 battery, it's NMC. The AM5 is LiFePO4, as is the Sunsynk.

512 simply means that the grid went out.

Unless you know what the balance start voltage is, use the requested voltage from the pack. Since it is a seplos, you could try to use their software to see what the BMS configuration is - if your charge voltage is lower than the balance voltage, the pack will never do any balancing.