mistaphix

Thanks Crossy,

Yes borrowing the PEA ground was more of a convenience until a better plan for install can be concocted. The property is literally on the beach with the new CU in a room facing the ocean. The ground (tidal sand) is only a 4-5m run of cable, refer to my first post:
 

Its pretty much sand until the Soi... Before jackhammering up the neighbours breezeway in search of some 'earth' I opted for the PEA pinch to get this charging station online.

Terminal / Connector Tips noted, will look into ordering the Henley blocks or similar. May have to put in a small incoming CU with a 100a Main Breaker (Stage 3 - upgrade the supply and meter 30/100 or juggle it all onto 2x63a to feed the old and new CU + another new CU for the leaky stuff. I've may have bloated the amperage tally, the max total is 203a for the whole premises including 8 of theses chargers. 

Am downgrading existing breakers to what they should be and the chargers are on 16a (speculated to be max draw at 7a each x two per circuit)

Chargers are not Class 2 and Im pretty sure these chinese masterpieces should be properly grounded. 

Charger Specs: this is all i have at the moment (plus a nearly useless schematic) 

And yes, Surge Arrestor and Under/Over is what i need to procure next. As mentioned, this whole thing is Prototype/Version 1 of a system that will get replicated and installed at subsequent locations, so I am looking for correct/adequate/available/elegant solutions. 

Many thanks and bring the family for some quiet water sports.

Thanks again to the moderators and contributors to this forum, regardless of my experience, there is no way I'd attempt this in Thailand without the valuable insights and advice offered here.

Initial Query: Do we need a line conditioner or something for these Batteries and Chargers (4 in total - 220V/7amp each)
Initial Consultation: Well, lets regress, the little beach shack your operating out of has no Ground to the original Breaker Box (CU) and all this commercial and domestic equipment tripping these power strips every day is an issue, see the melted plastic behind that old knife switch... your getting little tingles from the coffee machine. 
2nd Onsite Visit: We ordered 4 more batteries and chargers...
Subsequent Consultations and Evaluation led to ditching the plan of a little CU with a RCD and a SPD and 2 duplex outlets connected to either a MCB in the existing box with a new ground rod somewhere (see separate post) or 15m of THW 1x10 from the existing 60a knife switch out front.
I'll let the pics do most of talking along with a blow by blow and ensuing questions for this post
A. 'Borrowed' one of the two ground cables doing nothing but collecting oxide by the incoming pole. To it, connected 20m of THW 1x16 with a heavy duty copper cable to cable 2 bolt joiner. Some Hi-Voltage Splice Tape and liberal amount of vinyl insulation tape.
B. Added another 60amp Knife Switch along with a new enclosure (Question 1. below) and mated the two flimsy Chang switches with same materials as mentioned above.
C. Took L & N along for the 15m journey along the side of the shack with their long lost brother G/E via 3way rack & insulators. Note: PEA are doing major upgrades in the area which inspired me along with the fear of melted conduit dripping onto the neighbours breezeway.
D. New Haco 12 way CU (really wanted plastic split box, but not one supplier on Samui had either) populated with: 1 x Haco R7-263/30 - 2P 63a and 5 x Haco H7-16/1C - 1P 16am (4 x 14a circuits for the 8 chargers + 1 for other sensitive gear in the room. Opted for DIN as per Crossy advice on bigger selection of SPD (DSqaure Solution was nearly triple price)
E. Installed 4 x panasonic duplex outlets (best build quality ive used for the price point) and 4 circuits of VAF 2 x 2.5. Any suggestions of different brand/spec for a duplex 16-20a
F. Took some average pics and came here to the Mount Olympus of Fire before I finish Stage 1 of version 3 (This is a prototype install, which will have to be replicated a number of times for each property that take on this very cool new water toy (world first)

So the questions are:
Q1. Incoming: The 2 bolt cable joiner was, I think the only option for connecting the existing Ground to the new extension, any other suggestions?
But using same in the incoming enclosure just doesn't feel or look right. I did buy 3 poles of modular DIN 100a busbar, not super heavy duty, but I thought it might be adequate when used with ring terminals soldered on to the 16mm. Plans are to change the 2 x 60am Chang Throw Switches with a pair of no-fuse breakers 1 x 60a for the old CU + 100a for the new CU. Any suggestions on Switch/Breaker/Joiner etc for the incoming box, bearing in mind there is nothing else before or after the 15/45 Meter.
Before:

After:

Q2. New CU: Do I need to install a 63a Main Breaker before the RCD to use this setup now?
Stage 2 plan is to add another CU under this one for all the leaky and trippy appliance circuits starting with a 80/100a Main Breaker (2 deep freezers, 3 commercial + domestic fridges, coffee machine etc etc)
Q3. The expensive/specialised/sensitive Charger & Battery Combos need/want/require ultimate protection from all the fire demons. Over/Under Voltage Cutoff is fine, as protection is more important than continuous supply. Haco supplier can order the SPD I (naively/lack of choice) selected (Haco S7-40C/1C)  - Any other suggestions for Surge/Lightening Protection? And most important question, What else can I add to this setup to ensure that the potential for damage is at its least likely?
Adjustable? Voltage Regulator/Line Conditioner - DIN Mount is desirable or a standalone wall box before the CU would be ok. MOV's into each outlet?

Any brand/items that are readily available in Thailand, Chinese items that need replacing every week, will not cut it.
And finally, anybody know where in Thailand I can source Legrand Pass & Seymour wiring devices and accessories?

Thank you for the input which I took onboard and dug deeper (not literally and found the solution the kind team at PEA had left for me hiding in the garden whilst pruning the trees before starting the whole job (see other related post)
used THW 16mm, heavy duty copper cable to cable bolted connector, some hi-voltage tape then a mass of insulation tape. 

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I too am at a very similar stage of final design and installation, but alas limited by whats on the shelves around Samui.
A. What brand and where did you source the plastic din boxes? Schneider has discontinued their range. My ultimate solution was a split plastic box, am hard pressed finding many choices, ABB & Haco are the exceptions, stretching my budget and not on shelf...

B. Gsafe CU, am unaware of the product and google tells me nothing, more info please.
C. Surge Protector: i found a budget priced 'Sense' brand DIN product, or i need to order Schneider QOSPD for a push in box. Any product info for something to sit with a RCBO main breaker to protect some sensitive and expensive equipment rated at around 56mA , (8 devices at approx 7mA) + a few other sundry circuits 
Will endeavour to publish layout tonight for everybody's entertainment .

Firstly, thank you everybody for the wealth of information on playing with 'fire' in Thailand.
Am getting ready to install a new Consumer Unit to coexist in a older property which has no earth anywhere (except the street, every third pole)

To comply and make available properly grounded circuits for some delicate equipment, the task of bashing a 2m+ copper clad rod into either the garden outside by the soi, not far from the incoming meter (on the street pole) and close to the incoming knife switch, only 60amp (but more on that in a moment)
OR
into the sand on the beach, which is very close proximity to the new consumer unit location (installed inside)
My primary question after reading all the material (thanks Crossy) is:
The beach location suitable (short run approx 5m)
or the garden option which is obvious. (additional 14metres of 16mm cable required)