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The lower voltage panels are much more expensive (per watt) than house panels (35-40V)

2 x 100/15 is more £ than a 100/30 though

controller will blow before the fuse does

Max short circuit current for that 100/20 controller is 20A. I’d stay under that so you don’t risk damage to the controller.

use a 100/15 instead. or a 100/30 instead of two 100/15

My one is perfect

I want two 16S batteries in parallel, each with their own BMS. I like the JBD bms and wish to use ones with both UART and RS485...

Its for 8 to 17 cells. I imagine if it could work with 4 cells then it would be called a 4s-17s bms. These bms power themselves from the...

You want to top balance to 3.65 volts. After putting into service, you can daily cycle to 3.45.

That won't achieve a top balance

For cable sizes? I use BS7671 tables. And experience.

If you're using an iOs device, there's a free app called BMS tool that scans all available compatible BMS devices in sequence. Very...

The current is low - so no. It finds it’s equilibrium. Even at 4.5A you will be getting 0.2V drop on 1metre cables. 60A requires 10mm2...

I just converted 18awg to mm2. Yes thats way too small. 60A would want 10mm2 cables. The voltage drop on the cables is throttling the...

But its only done about 7A average? Sounds like fraudulent specs. It might benefit from better cables.

Possibly you’ve over complicated it? Can be as simple as lining the cells up, crimping rings on the balance leads, placing the busbars...

Jk bms can probably manage a 12S battery, depends on model. Depends if you have a charger that will do 36V. Victron smartsolar will for...

If you discount the time connecting and disconnecting it should be quicker. When top balancing groups of cells you always have to wait...

If you're using an iOs device, there's a free app called BMS Tool that scans all available compatible devices in sequence.

The cabling for the 12/3000 is massive. That and the mppt aspect is why i would have advised 24V