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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...

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

Interesting. 12V is a bit low for 3000W. Wonder why they didn’t want you to go to 24V

So using your batteries to shave off the peaks is the way to go I suppose

Is that usage by the house, or just usage from the grid?

Panels need to be sized for consumption IMO. You cant just keep on getting a bigger and bigger battery to try and survive through shortfalls. A 2-5 day’s consumption is probably about right

4182USD for 48 cells “DDP”

What area are you in? Fancy getting some for me?

With Exilporc?

I don’t think Customs would entertain that neither that the channel crossing companies would allow it. (Dangerous goods)

I wouldn’t fancy going through customs with all those batteries trying to argue they are personal effects. Also the boat or tunnel wont want dangerous goods like that. They tend to draw a distinction between batteries that are in things and batteries that are unattached. Ive had clarification...

Have had some of these from Fogstar (UK based dealer) and have been very happy with them. Unfortunately they went out of stock and the price has now gone up to £115. NKON jn the netherlands (holland) have them for almost half that price but they wont ship to UK. So - I’m considering going...

The problem is different internal resistance of the cells. So one battery will drop voltage under load more than another and give less current compared to the stronger one (with less internal resistance). They can also have different SoC/voltage curves even with no current flowing.

Yeah i want the Envision 305Ah but the fogstar price has gone up.

Its for a business with VAT and EORI registration. Theyre saying theyve has problems with them being “dangerous goods”. I can only guess that DHL have tightened up their rules. Or Nkon are using it as an excuse because they cant be bothered with the extra paperwork to the UK

“On the horizon”

Seems like they shipped to UK for parody in the last month or two.

they’re saying its because of dangerous goods rules. As a third country we are going to require more paperwork than EU members. Nothing’s changed for a year or two though

I haven’t seem any new rules in the last few months. Although i don’t watch sky news they dont have any exclusive news stories.

What are the new rules?

So they are point blank refusing to ship to UK now. Have a word!