off grid 240v system 24v batteries 4 230watt panels

[gasmick2]

Hi i am in the process of building an off grid stand alone 240 v ac system for my shed and garden use
basically i am using a 24 volt dc input pure sine wave 1500watt peak 980watt cont the output goes into a garage type 2way rcd unit with 6amp and 16 amp trips, the rcd is a 35 millamp device,
it has all been wired up and i have 13amp socket outlets for using lights in the shed from 1 socket and from the 16amp one strimmers and lawn mowers etc,
For the earthing i have a 4ft 5/8th solid copper rod banged into the ground with a 10mm earth wire to the consumer unit it is also connected to the inverter case
i am charging the batteries with 4* 230watt solar panels wired in series and then in parallel giving me 15 amps at 58v that goes into a MPPT charger that gives out around 28v dc at around 20 amps so should be enough to charge the battery bank of deep cycle sealed batteries.
NOW THE QUESTIONS????? i bought a blue background light digital voltmeter and ammeter it picks up the current using by passing the live feed to each outlet through a ferrite wound pick up small coil i assume from E M F ?? and the volts from a normal pos plus neg connection
All worked ok from the inverter giving 230v plus AC but as soon as i connected the digital meter the rcd keeps tripping ?????
i just wonder why this is as soon as i pull the plug off the board alls ok again??
all i wanted to do was to monitor the output from the inverter and power being used at 240 v but i have come to a stop with no answer

do you think it would be possible to use an analogue volt meter, and an analogue ammeter with a 75 mili amp shunt

THE LAST QUESTION is do you think i should connect the neutral from the batteries to the earth as on a mains system???
and also the neg side of the solar panels
so it all becomes the same potential
I do know someone who has got a system but his 240 v is floating with no earth???? i think its unsafe ????
i know a lot of things now days are 2 wire fully insulated so perhaps as long as he uses those things he might be ok

by the way when i have got it all wired i am having an electrician to do all the earth loop testing etc on the system and get some test results

thanks in anticipation mick morris javascript:emoticon('8)')

By the way i am a retired gas engineer plumber

 

[ricicle]

By the way i am a retired gas engineer plumber

Which is why you should have left it to someone who knows what they are doing

Have you got the N and E reversed at the test socket ?

 

[gasmick2]

thanks for the reply no i have double checked all the polarities on all the connections it all works fine without the meter connected, any way i have tried the connection to the small plug on the board the other way but it still trips, i do not consider myself incompetent after years in the heating trade when we were allowed to wire up our own electrics in fact it was part of the exam under ACOPS for certification but it altered under the new scheme
and i never bothered to take part P as i was due to retire due to cancer opp anyway mick

 

[ban-all-sheds]

i do not consider myself incompetent

But you can't get this to work....

by the way when i have got it all wired i am having an electrician to do all the earth loop testing etc on the system and get some test results

Get him in now. It should not have been energised before testing anyway.

Were you aware, BTW, that you needed Building Regulations approval before you started this work?