Two Sunny 1800's [RE-wrenches]

[William Miller]

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Nick:

Your wiring plan will work and is legal, to the best of my knowledge.  One 
down side:  If you need to shut down only one 1800, you can't.

I think you are also mis-calculating the cost to install a sub-panel.  Last 
time I purchased a GE TLM612RCU the price was $33.5700.  Add two breakers 
at $3.00 each, a hub (you'd need one for the disconnect anyway) and your 
looking at less than $50.00.  By contrast, a Square D DU221RB will cost you 
about $58.00.  Not much difference there.

I'm not sure why installing a sub-panel will require a 60A disconnect.  If 
you tie in to the existing residential electrical with a 2 pole 30 amp 
circuit breaker, any utility or local jurisdiction required disconnect can 
be sized at 30 amp.  You run 30 amp wiring (assuming length is not an 
issue) to your sub-panel.  Installing a 60 or 125 amp sub-panel does not 
require that you feed it with 60 or 125 amps.  Size the feeder for the load 
(or generation) and protect it accordingly.

Also, here is no need to unbalance the feed.  Run both phases to your 
sub-panel and install one single pole breaker on each buss.

Questions?  Feel free to write off list, if you prefer.

William Miller

PS:  The B2020 is a good way to mount your strut.  Why not try other 
suppliers to see if there are any out there on someone else' 
shelf?  Graybar lists it.  I particularly suggest plumbing suppliers, where 
I find more stock of strut for a better price than electrical 
suppliers.  Barring finding the B2020, you could use large U bolts, or make 
them with all-thread.  I made a jig to bend all-thread.  You need a smaller 
diameter jig so that when the all-thread relaxes, it will come to the 
diameter desired.

WM



>Greetings Fellow Wrenches,
>   I have installed a couple dozen Sunny Boy 2500's but next week will be 
> my first time installing two 1800's. Wondering why I can't install them 
> without a subpanel.
>  The obvious plan is to run each inverter's 120v hot leg through each 
> pole of a 30 amp 240v AC disco and then on to the double pole 30 amp 
> intertie breaker. Since each inverter would be running through it's own 
> pole in a single breaker it should suffice 690-64 right? All without 
> paralleling any wires, in one disconnect and one breaker. Any thoughts on 
> why i can't do this or issues I'm overlooking? I can't see the need to 
> involve an extra subpanel and if i did go the subpanel route it pushes me 
> up to a 60 amp AC disco (not that big of a deal but an extra $20 above 
> the 30 amp version). In the end it would save the customer about $200, 
> less equipment on the side of the house and distribute the power to the 
> service more equally.
>
>  Also, anyone have a good resource for conduit clamps to mount strut to a 
> 6.625" OD pole? Our usual electrical supply says they are made to order 
> and won't be available till January. I've tried the threaded rod 
> technique but not very fond of it. I believe Cooper's part # is B2020 but 
> not sure where to purchase them (except the local month and a half wait 
> option).
>
>As always thanks for your time,
>Nick A Lucchese

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