TronxII

And a nice to have tool is a DC clamp Amperemeter. Not an AC clamp Amperemeter! They start from 35$. This saves you the hassle to disconnect cables to measure current.

Unfortunately I cannot comment on the Lazada batteries, but I've been through similar experience with the Aliexpress junk. Now with new Docan batteries, it feels like in another world, thanks to the Solar DIY forum where you are also active. I'm planning to put a battery pack for my in laws next year. Once you get the cells, could you please let us know how much thai customs charged or if the Alibaba seller can export them without going through customs?

Indeed, you are missing most of the relevant parts. Power draw, Panel size, Panel voltage, can your pump start from a panel, control mechanism of the pump etc. Find a local guy who has installed this before, or buy a kit with all components, and then come back with pictures and questions - if you have.

Apparently @SomchaiDIY answered this question very well. If all the falangs posting here had the same knowledge as he ... Thanks SomchaiDIY And another thought: so these MCBs are a no go in a Panel combiner box where you parallel panels.

I'ts not L SC it's i SC. I is for current like U for Voltage. SC means short circuit, this is what you measure when you connect the + and the - of the panel. The IMP is maximum power, which is not at short circuit, but somewhere at 16V for a "12V" panel Where a 12V panel has 18 or 20V under no load. The same applies for your 24V panel, but higher voltages. So basically, you also need to check the open circuit voltage of the panel. I recently bought 2 new flexible 100W 12V panels, to put in parallel with my existing framed 100W 12V panels. Once they arrived, i realized that the new panels only do 18V instead of 20V open circuit. My bad of course. This also affects the maximum power voltage and does not work well with my MPPT inverter.

Maybe a cheap kWh counter would make your day? These are around 10$ which is nowadays 10 pounds on Aliexpress. I assure you that it's really cool to see the kWh going up. The funny thing with these counter is: You can put them in any way, they will always count forward. Some guys claimed this also for the digital PEA counters when feeding into the grid.