Ok now I've got a readying. It bounces from about 60 up to 160 ish ohms. Resistance is the same at the meter and at the inverter.

Have you actually disconnected the black and white wires from the Sunsynk inverter?

A 2-wire CT clamp is just a coil inside a piece of plastic.

I've just unboxed one I have here to try this for myself.

This blue clamp is labelled 50mA (max output) for 100A max current being measured.
So a crude multimeter reading of anywhere between 1-ohm to 150-ohm would suggest that the coil is intact.

Zero ohms is a short circuit.

Open circuit would be a mega-ohm or so.

Anywhere between 150ohm - 1 Mohm means there's likely to be more than just a coil in your unit.

@transparent yes I removed from the inverter to test. I tested at 2 connection points (it had to go through a tonne of conduit)

@transparent Solved. It required an input ie solar or battery before it started working. I hooked up my faulty 2nd solar array (a couple of dead panels bringing the whole thing down) and with the few hundred watts I heard it switch and there we go! Glad I dont have to rerun cable. Ive sliced the cable with cat 5e, soldered joints and locked. Now just need the batteries ...which are still sat in the port!

Good. I'm pleased to hear that.

Yes, it is quite common for inverters to require an input before they will operate.

There is usually a 'priority' order for these, which can make it difficult to restart an inverter when a fault has occurred.

For example, the Growatt SPF5000 inverters can only be restarted/reset when they are fed from the storage battery. So you first have to remove their mains supply and isolate the solar-panels. Only then will the on/off switch allow the inverter to be turned off and on again.

@hughf Ive got the V2 bms' coming. Should I connect the B+ first?

You need to pick up this information from the Seplos manual @makia2023

The majority of BMS units do not have a B+ connection at all.
Their operating power is derived from the highest voltage wire on the set of balance leads.
Thus they become 'live' when the balance harness is connected.

I've picked these two examples (Daly & JK) to demonstrate that principle:

I'm puzzled that Seplos have a BMS design which not only has a separate B+ connection, but where the order in which the +ve connection gets made is critical.

I've just checked a Seplos manual for one model of their BMS units, and it does appear that the order in which the wiring is done must be followed pedantically. But this manual may not be the one for your particular BMS, so beware!

So I checked my delivery today and saw that it was due to arrive on weds next week. Off I drove with wife and daughter to my parents for Christmas, several hours away. As I'm tucking myself into bed I check the delivery tracking again and I see that DPD have dumped £4500 worth of kit on my drive way (registered as my read porch???!!). Ive just had to drive home to put away safe.

Not the end of the world but the Muppets have only delivered 14 of 15 boxes so I'm 4 cells down for the build. Fortunately I have a picture of the delivery (from their driver) which clearly only shows 14 parcels. I'm hoping that the missing box was just left on the van and it hasn't been misplaced permanently. Now I have another 2.5 hour drive back to Christmas......only now I'm extremely miffed.

If they've lost it, I will need China to report through their logistics company as according to the DPD terms I'm not the contract holder, the retailer is.

😭

So the plot thickens. DPD received a booking for the 15 parcels, but only received 14 from the agent at the port. Ive passed it back to Brian now to try to resolve with his logistics partner.

I'm guessing it is somewhere in Felixstowe still although I'm unsure how they could miss it when it was all packed together. I'm preparing myself for an argument over £300. 

• @Transparent assumingI don't get them, will it make a difference that replacements won't be matched?

Oh woe!

You're right to get Brian involved. China doesn't have the Christmas holiday that we get, so he'll be able to work on your case whilst you enjoy watching your daughter's surprise at being given a multimeter and a torque-wrench by Father Christmas. 🤩 

If the cells do need replacing/re-sending, then it's unlikely that there will be a great significance in their functional specification. EVE do gradually achieve better cells over time, but it takes months of manufacturing to do so. For example, the cells rated 280Ah in January 2003 were marginally over that capacity, but by December they're probably closer to 300Ah.

Yes, I agree that the missing box is most likely at Felixstowe, but it will still have the same bar-code and tracking details as the others, and is likely to be found over the next couple of days.

I suggest you photograph the labels on the boxes you have. That might help the agent who works inside the customs zone to identify what they're looking for.

DPD are right to deliver the fourteen boxes that they received, but obviously not on your driveway four days ahead of their notification. 😣 

They are being awarded this contract by the Chinese shipping agency because they are meant to have adequate logistics in place to handle this type/value of shipment.
So anyone else in the UK ordering EVE cells from Brian at Shenzhen Xuba would also have them delivered by DPD.

I always ensure that the shipping agent has my mobile phone number, which allows DPD to directly contact me if there's a problem. And I also benefit from being in the rural West Country, where we get to know the courier drivers on first name terms. As a result, I receive a higher quality of service than you might in a city, where the delivery round could be assigned to a number of different drivers.

The responsibility for your consignment being left on your drive ahead of the due date is with the DPD Branch Manager who oversees that driver. He must be informed what has happened, and given the opportunity to check what went wrong.

I suggest you start by identifying the DPD depot, and see if you can do a bit of online sleuthing to locate a contact email address or the name of the Depot Manager. They may have a LinkedIn account for example.

Even if you draw a blank, you can send a webmail starting with the line FAO Branch Manager at NNN Depot.
Here is DPD Contacts page and their Complaints Charter.
I recommend using email or WhatsApp rather than telephone. You need to keep a copy of what was said.

Had a chance to unpack a box tonight and it all looks very well put together. All the electronics are connected with just the sense wires B+ B- to connect. Manual emailed to me and very self explanatory. My plan is to put 1x box together on weds and connect up. Will charge at 20amps with the battery settings provided with their spec sheet (I'm told this should serve to balance them although I will manually top balance the remaining cells separately). Brian tells me this should be sufficient and although he says each battery should be at least 305 Ah I will set the system to 280, 560, 840 Ah once each pack is online.

Ive read quite a bit on float, , soak in top and bottom voltages and will post my proposed settings once I'm at that stage. 

@Transparent I'm told 48v as the cut off is the best options as that is approx 10% soc. Is this your view and can you provide any advised values for me to confirm what I've read (or not).

Also, I'm assuming Pylontech setting for the inverter should work with the seplos BMS?