Lots of advertising for SunSynk here - should probably mention that their network in the UK is offline yet again today, and we haven't been able to access our inverters for over 12 hours and counting... They may make good hardware, but their online services are an afterthought written on a post-it, taped to a potato.

LiFePO4 cells are a great advance in battery tech. They don't burst in to flames like normal lithium ion if they get damaged. Many LiFePO4 cells are what is known as deep cycle, which means that you can take them down to a low voltage cut off without causing damage to the battery. LiFePO4 batteries do not like going below 2.65v per cell, but fully charged they are 3.65 as opposed to the lithium ion which is 3.2 to 4.2v range. This is why some chargers won't charge a completely flat cell as rescuing a flat cell you have to be careful how you do it, and you also have to be careful with the charging voltages as they are different. Sometimes it is possible. LiFePO4 batteries don't have the peak current output that a lithium ion does, which isn't usually a problem for a PV battery as you'll take the charge out gradually rather than as with something like a drone which is done in 10-20 mins. You can and do get gel style lead acid batteries which are used in alarms, UPS's, mobility scooters etc as they don't have to be kept upright and won't leak out the acid, but they don't have the peak current output ability without causing damage compared to a car battery. A car battery is designed to give a brief amount of power to start an engine. They are not deep cycle, which is why leaving them flat kills them, unlike a deep cycle gel cell which will tolerate it to some extent. LiFePO4 also generally can't be charged too rapidly - typically half the battery capacity, so an all day charge via solar is fine. Unlike lithium ion which can handle many times the capacity rating. This is why LiFePO4 is not suitable for EV's, although some electric bus's do use LiFePO4 as paralleling them up increases the take off peak power, and a bus will normally sit overnight to charge.

Haha, yes, fuel up the car, check the washer bottle and top up the battery cells. How many years has it been since I topped up the battery in the car? Maintenance free took care of that long ago. Obviously this is a simplified description of canbus and battery comms for the average person off the street. There's also good old modbus over RS485 present on many battery systems.

If only the people of Graveney watched your video, they seem to think LFP batteries are going to murder puppies. According to Swale Borough Council LFP batteries are "more subject to explosion risk than other types", which is news to anyone who understands chemistry, but in modern Britain feelings trump science.

Also to take into account is that lead acid is only good for 50% of it's rated output before you start getting into damaging low voltage. You'd need upwards of 10kwh rated of lead acid to get 50kwh of useable power.. This is well know in the leisure, ie, caravan/motorhome industry,

Mixing units as usual - the washing machine would use kWh not kW 🤦‍♂️ Also to note that Lead Acids have a 50% depth of discharge so you essentially need double the capacity you calculate from the Ah ratings to get the same useable capacity unlike Li where you can go down to 5-10%. Another downside is that the charge and discharge rates for LA are far lower that Li based packs meaning again bigger overall banks for LA vs Li for the same power delivery in either direction 🤓

My battery storage is lead acid well actually AGM they are in a garage so space and weight not an issue plus i get the batteries for free

Sodium ion batteries look very promising for home storage. The don't currently perform as well as lithium, being larger and heavier, so not as good for EVs, but not really a problem for stationary storage. Sodium's a way more abundant material than lithium, so cost of manufacturing should be cheaper.

"An industry standard protocol…" which no two manufacturers seems to be able to agree on sufficiently to allow interoperationality. So flaky is it that even kit from the same source is a bit hit and miss. 🤣

Leave the lithium to the mobile application. Use lead for stationary uses

Yeah but lead acid don’t spontaneously burst into flames like lithium

Nice story, but for sure I do not want a big such lithium battery n or on my home. For safety I charge all lithium cell (my iPad/iphone etc) in a metal cubert with fire resistant coating.