Author Topic: Solar system voltage?  (Read 1220 times)

RWS

Re: Solar system voltage?
« Reply #15 on: August 10, 2018, 05:32:36 PM »
The 6 additional solar panels came in today.  They will go with 5 existing solar panels to make an 11 panel string, all coming in on two wires.  37.65VDC under max load times 11 = 414 VDC to the inverter and also to charge the batteries.  So I have gone from 24VDC to 48 VDC and now my neighbor is putting in 414VDC charging to Li-Ion batteries.  Times are changing....

https://d3g1qce46u5dao.cloudfront.net/data_sheet/5bb_jap672s01_sc_310_330__1500v.pdf

John Galt 1

Re: Solar system voltage?
« Reply #16 on: August 10, 2018, 07:28:43 PM »
I like that cadweld splice, I just used a grounding clamp.     

How did you sink the ground rod?      I used a 2 lb hammer for a good workout to drive my 8' rod into the ground.

I've read up a lot on grounding principles and know that having more than 1 rod can be problematic.       I didn't want to risk bringing lightning into the house so most of the system is on the house's old ground but I isolated the combiner box from the panel rack and grounded the panel rack and panel frames to a separate rod.

I also moved the electric fence to a separate solar powered charger so the fence couldn't act as a lightening rod.

RWS

Re: Solar system voltage?
« Reply #17 on: August 10, 2018, 07:58:32 PM »
First there were two of us tag teaming it.  We started with a mini sledge hammer and finished with a maul.
  My understanding is if there is more than one ground, they should be made common. (tied together) The influence of a ground rod is 1.1 times the length so to get the most out of two 8 ft ground rods they should be at least 17.6 ft apart.  That is 8*1.1=8.8 * 2 = 17.6.  The problem with using the one shot is the electrical supply house does not stock them so you have to buy a box of 10.  That's why I usually have some in stock. 

John Galt 1

Re: Solar system voltage?
« Reply #18 on: August 11, 2018, 07:38:28 PM »
I was pleasantly surprised to see that Home Depot keeps 8' copper clad ground rods in stock.

Fixit

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Re: Solar system voltage?
« Reply #19 on: August 12, 2018, 10:46:37 AM »
On the ground rod  the easiest one i ever did we used a hammer drill (a big one ) . The guy had a cup  about 2" deep on a we a shaft . Went right down . Looked like this.
https://www.zoro.com/bosch-ground-rod-driver-1-18-hex-hs2172/i/G1416931/