[TriEmbed] Inexpensive 120V (15A) to 240V (7.5A) transformer?

Shane Trent shanedtrent at gmail.com
Wed Apr 27 10:54:58 CDT 2016


This is what I had in mind.

[image: pasted2]

On Tue, Apr 26, 2016 at 9:51 PM Shane Trent <shanedtrent at gmail.com> wrote:

> Robert,
> I believe the inverter has L1-N-L2 inputs and N is not grounded. I expect
> there is no electrical connection between ground and N. I wanted to tie
> the 120V input ground to the chassis or earth ground of the system (strange
> calling it an earth ground since the entire system is mobile and never tied
> to an actual earth ground).  The goal is to ensure the only conductive
> path from 115V inputs to Ground or the 230V outputs (L1 or N or L2)  to
> ground is through a fault condition that should trip a GFI on either the
> 115A input or the 230V output breaker in the power box connected to the
> output of the the inverter depending on where the fault occurs.
> No schematic. It is a Scheider XW+ 5548 NA, which is an amazing piece of
> machinery. Combined with remote administration via their ComBox it is a
> fantastic setup. The system is powered via 18kW of AGM batteries and backed
> by a 3kW generator.  Wired with 00 gauge welding cable and 150A breakers at
> every power entry point on the DC bus.
> http://solar.schneider-electric.com/product/conext-xw-na-solar-inverter/
> Manual
> http://cdn.solar.schneider-electric.com/wp-content/uploads/2015/09/conext-xw-na-owners-guide-975-0240-01-01_rev-f_eng.pdf
> The inverter has L1-N-L2 output terminals, L1-N-L2 AC input terminals and
> L1-N-L2 Generator Input terminals. Again, my quest is simply allow the 3kW
> generator to feed the L1-N-L2 generator inputs and provide a valid ground
> reference to allow GFI breakers on the inverter L1-N-L2 outputs to function
> in the event of a fault.
> Shane
> On Tue, Apr 26, 2016 at 9:12 PM Robert Gasiorowski <rgresume at gmail.com>
> wrote:
>> Since GND is connected to N at the panel, it will work. However, it's
>> dangerous, it is a code violation, and GFI will not work.
>> If your inverter has 240V L1-N-L2 inputs and N is grounded and connected
>> to center tap, then that will be a problem and you may have to use isolated
>> transformer. Do you have schematic or pictures of your inverter's guts?
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