Grid connect System installation rejected

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Grid connect System installation rejected

Postby Splat0606 » Sat Nov 03, 2018 5:08 pm

Hi to all, We are in the process of getting a grid connected solar system, we were looking at a 9.3 kw system with a export limited to 5kw an hour, ready to install next week so I thought, not that easy!. We got a message that said our poll and wire company will not let us put more than 3kw back in to the grid. The reason being that we are at the end of the line and feeding in more than 3kw back in to the grid may cause brownout and supply interruptions to outher users. Has anyone else had this problem.
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Re: Grid connect System installation rejected

Postby Gordon-Loomberah » Sat Nov 03, 2018 5:45 pm

Hi Splat0606, welcome to the Energy Matters Forums :)

PV system owners having limits placed on their exports is quite common, and I'm told that some are allowed zero exports, so you aren't alone in this. The issue is voltage rise, (in reality opposite to brown outs, which are due to low voltage), but possibly causing damage to some equipment, and causing more power to be used than if a resistive load was operated at the correct voltage. In Australia the standard is actually 230V +10%/-6%, but unfortunately many grids are operating at significantly above this voltage. I read recently on Renew Economy that mean voltages are more like 245V.

It might be worth having your grid voltage logged and suggesting that they bring it into line with the standard, in which case 5kW export should be ok.

In the meantime perhaps go ahead and set the inverter limit to 3kW, but see if you can have that increased in future.

Also, it might be worth looking into battery storage, to reduce the need for exports!

See here: https://reneweconomy.com.au/too-much-so ... tly-59547/
and here: https://reneweconomy.com.au/lousy-power ... -pv-46568/
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Re: Grid connect System installation rejected

Postby Splat0606 » Sat Nov 03, 2018 6:29 pm

Hi Gordon, thanks for the info until now I had not heard of this, battery’s are looking good.
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Re: Grid connect System installation rejected

Postby jules » Sun Nov 04, 2018 2:09 pm

Gordon-Loomberah wrote:
Also, it might be worth looking into battery storage, to reduce the need for exports!

See here: https://reneweconomy.com.au/too-much-so ... tly-59547/
and here: https://reneweconomy.com.au/lousy-power ... -pv-46568/


and perhaps equally, imports [or any form of grid connection] if the estimate [from" lousy power"] that poor grid management and high grid voltages are actually costing $3.000 per household over five years, is anywhere close to accurate.
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter. Off grid for 30 years.

Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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Re: Grid connect System installation rejected

Postby Tracker » Wed Nov 07, 2018 7:08 pm

and yet again - you can divert ALL excess power to other storage devices like HOT WATER

I have estimated that we save the equivalent of over $2 per day, heating water for very little actual cost..

would be so easy to store ALL excess power as either Heat-Energy or Battery Power..
..
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