Recent content by squowse

the components are faster to respond to over current, The fuse just interrupts and prevents a fire. The MPPt have an internal but its not replaceable as the componenets will already be blown. Just to prevent fire/further damage.

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

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 connections. I want to use the UART for the Bluetooth and RS485 for Victron Venus OS using louisvdw dbus driver. The model i am looking at is AP21S004. The only...

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 balance leads so there is that.

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

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 even at a very short length. Thicker is obviously better.

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 current. I would still use the bms to charge the cells first though,

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 and screwing them all down.

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 example.

If you discount the time connecting and disconnecting it should be quicker. When top balancing groups of cells you always have to wait for the slowest cell to get to the top. Also it could be said that theres a detrimental effect to holding the other cells near the top voltage for long periods...