G77 Standard -is it good enough?

[ecogeorge]

I am in the process of re-wiring and registering with ofgem my 1.4kw pv solar array that is not yet grid connected 
I have installed isolators etc etc and ofgem approved generation meters and about to send the registration off to ofgem and inform my DNO of my intention to supply the grid.
However my question is this ? -
Approx half my pv connects will connect via a soladin 600 - G83 approved.
The other half connects could connect via several OK4e inverters- these are no longer available but were made by NKF electronics in The Netherlands. They are 24-50vdc 100w max grid tie.
Advertised as EN 60950, KEMA, UL1741 for safety and class 11 isolation. EMC emission -EN 50081-1, IEC 61000-6-3.
EMC immunity-EN 50082-2, IEC/EN 61000-6-2.
I have programing documentation for each inverter from "Sundog energy  Ltd" Cumbria and all programmed to G77.
Can I connect to the grid with these ? or do I need to replace them with a soladin 600?
I guess only those of "Teds "  expertise can answer this ?
Becoming increasingly urgent as there is a limit to how much I can bribe my friendly registered electrician!
rgds George.

[Ivan]

G77 is perfectly acceptable. It was superceded by G83...but to avoid problems with equipment that had already been installed/sold/manufactured, it was deemed that anything with G77 would automatically qualify under G83

[Ted]

There is a small difference between 'programmed' for G77 and 'certified' though.  In the end it would be up to you to persuade your DNO that it is OK. Showing them that it disconnects when the grid is turned off might be enough or they might insist on a G83 certificate.

[ecogeorge]

Thanks Ivan and Ted for speedy replies.
Do I need lockable isolation on the dc side - only 24-40 volts max per inverter. I have 5 inverters in use so would need 5 isolators???  Seems a little excessive as these were designed to fit on the back of the solar panels.
Any thoughts?
rgds George.