sunset1

The Hubble AM 2 is about 16k at voltex.
Coild be wrong but OP batteries should go for about 7k-10k depending which one and considering usage, risk etc
Market will decide either way.

I will manually charge all 5 cells separately to 4.2v, to balance the pack, and chances are good that the battery pack still have alot of life left in it, I would use it a couple of times and see how many charge cycles it does before the capacity becomes unusable again, if the pack goes horribly out of balance again within +-30 cycles, then will I add a balancer.
If it goes out of balance within the first or second charge/discharge cycle after manually balancing, then im afraid the balancer will be of little benefit if any. new cells is the only way forward then.
I have recovered plenty of cells that had a voltage of 2.4 volts, below 2v I chuck it in the trash, I dont even attempt to revive or capacity test.
I assumed that 2.4v is the standard low voltage cut off for majority of bms'e (actually in this case is just a battery protection board) because I also found a lot of battery packs (powertool and laptop) that the packs was dead, and inside it was one string or cell at 2.4v and the rest at 3.xx volts

<Powerforum-store competitor reference snipped by mods>

The primary problem is not the quality of the cells, it's that those batteries don't have balancers in them. I have considered buying ingco batteries to harvest the cells - they are currently the cheapest source locally.

Attached is the data sheet for high star li ion cells,
they come in a 1.3ah, 1.5ah, 2ah and 2.2ah capacity, according to HIGHstar their specifications are the same just the capacity differs????
If I were in your shoes I will source Sony/Murata vtc6 cells, out of my own experience if I require a high discharge battery They are the absolute best.
another good cell is the LG chem MJ1 cell,
both of these 2 have 3000mah capacity vs the 25R with 2500mah.
dont even consider a samsung 35E they are not high power cells, any samsung cell with a R after the numerical identifier is high discharge cells, eg 15R, 20R, 25R
ISR18650-1300大配组通用技术规格书-486-2019.pdf

Samsung cells are the best, IMO. But they do come at a cost.
Try Samsung 18650 3500mA 3.7V Lion Battery - Micro Robotics, INR18650-35E

The Hubble AM 2 is about 16k at voltex.
Coild be wrong but OP batteries should go for about 7k-10k depending which one and considering usage, risk etc
Market will decide either way.

My geyser had a 4kW element which I downgraded to 2kW. It now runs anywhere from 2 to 5 hours depending on how cold the water is to get fully hot, so interpolate for less PV available. Imho, 1kW is too little. Since I upgraded my solar I'm actually thinking of upgrading it back to 3kW.

Can get a brand new dyness for R15k from Solarware house.

Mmmmm... maybe not worth it.
Try to bury it and if that doesn't work, just trough it away.

Here is an out of the box solution: install a DC geyser element in a bathtub and connect it to solar panels. You would probably have to put an evaporation cover on the tub and there are a few safeties to consider. But I see no reason why you can't have a nice hot bath after a sunny day.

maybe not quite as bad... if its 1/2" pipe, this lot may be an option at R 22.77 for 1.8m it sounds more reasonable than you're thinking but not exactly dirt cheap either, but instead of R 5k, around R 640.00 which may be easier to swallow...

For a flat plate collector or hdpe piping you'd still need a tank of some kind to store the heated water, and it won't help in the early morning before sunrise unless the tank is well-insulated to keep water warm through the night.
If you're using fireplaces for heat anyway, why not look at a Rocket wood-fired water heater (donkey)?

Well to preheat the water makes a huge difference in water temp in winter and gas consumption.
I have a 16l gas geyser for 2 bathrooms, It was connected straight inline with the hot water line to the taps, bypassing the electric geyser completely.
with this setup I used 9kg every 9 to 14 days depending on the season. My outside pipes is insulated with much cheaper pipe insulation, I saw the pipes in my roof was insulated with old cloth and rags bound around the pipes with twine, and that also works.
about 6 month ago I put my electric geyser back inline to preheat and feed the gas geyser, I set the geyser thermostat to 40 degrees and changed the element to a 2kw unit.
I use 4kw/h to pre-heat the water (150L) thats fed to the gas geyser, in the dead of winter with only the gas geyser heating the water I could not get the water temperature above 45 degrees.
now with the preheated water the temperature easily reaches 80 degrees in the summer(80 degrees is the geyser's cut out temp) and I have not seen the water temp below 55 degrees and the gas geyser is set to max water flow and min gas, and this have resulted in a 9kg gas bottle lasting 25 days plus....

He's asking R13000 not R13600

Miscalculated.
Thought was R12600 per battery.
R13600 per 2yr old battery ..

R2.6k more for brand new battery.
For some reason batteries got significantly cheaper, good reason to upgrade but has impact on 2nd hand value.

TH16-like:
eWelink -interruptor inteligente TH16, Control inalámbrico de temperatura y humedad, 16A, WiFi, Compatible con Alexa y Google Home - AliExpress 44
Comm cable for pylontech:
Cable de comunicación para consola de batería de litio US2000C US3000C US5000, Cable de depuración Serie USB prolífico RS232 a RJ45 8P8C - AliExpress 7
Sonoff 4ch:
Sonoff-interruptor inteligente inalámbrico para el hogar, dispositivo de 4 canales, R3/4CH, con WiFi, 4 entradas, temporizador de cuenta atrás, Control remoto, automatización del hogar a través de la aplicación Ewelink - AliExpress 44
Smoke detectors:
Sensor Detector de humo inteligente con WiFi, alarma de seguridad para el hogar, protección contra incendios, certificación EN14604, Tuya, 80DB - AliExpress 30
Intelligent power meter & switch:
EWelink-medidor de energía inteligente, vatímetro monofásico de 1P con carril Din, WIFI, consumo de energía en kWh, con Alexa y google para Smart home - AliExpress 44
1P Din Rail WIFI disyuntor temporizador inteligente interruptor relé Control remoto por aplicación EWeLink Smart Home compatible con Alexa Google - AliExpress 13
Temperature and RH control:
es.aliexpress.com/item/1005001928457738.html?spm=a2g0o.order_list.order_list_main.945.163a194dfCx8NS&gatewayAdapt=glo2esp
 
No issues at all with these orders.
 

I use several. I usually choose supplier based on price.
Delivery time depends on origin. If the goods are coming from Chine, it takes about 3 weeks. If the supplier has a warehouse in Europe you can get items in 5-7 days.

For Sonoff and Sonoff-like things, Aliexpress

Also avialable at Communica . Only had good service from them .

My goto safe stores for gadgets and components
https://www.robotics.org.za
https://www.pishop.co.za/store
https://www.communica.co.za
https://www.diygeek.co.za
And sometimes takealot for vizia power monitoring plugs that can be tasmotised

@sunset1
 

Then it's fine. Any of the fuses looked at will work. 

I meant to say no need to go and fit highly over rated fuse holders save up to 250/1000V when you in fact only operating on 12V.