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Time to upgrade my old Solar/Ups system
#1
just an INTRO on what my plans are and a little about the requirements of my project for context for future questions.

located Brisbane  20mins from the city.

I run an usual set up for my industrial site urban farm. 
There is no metered direct power supply to my lease, despite being advertised with power to the office, except a 3 phase and single phase connection from next door on my property.
I was using the slaved off connection from the neighbors at a charge rate of a 70/30 split of the bill where I have to pay the 70% which totals at $340 a quarter for the daily use of 4 1/2 kw to run my aquaponics system. which is nearly X3 the cost of the consumption.

In order to reduce further operational costs I installed a reclaimed Solar/Ups system consisting of 4 X 250w panels and 24V 200ah on my Acto/mushroom inoculation lab driving the fans and lighting and emergency air backup system for my fish during outages or tripped breakers as I don't have access to the meter box inside the neighbors shed.
Because of this any use of my high load power tools are run off the generator.

After 14 months of this I finally had the shits, disconnected the supply told the neighbors i am no longer paying the connection and half their usage to their business and increased my battery bank to 24V 440 ah and now run the genset of a day to top up the banks when required. which costs me $20 per month in fuel.

I am now in a situation were I need to go commercial and the genest is no longer a viable option, food safety reasons and I need to power a set of air-cons  for my coolroom and mushie grow tents.

I am looking at 2 separate builds the first will be a DC set up to power my 24/7 low load fans, humidifiers and led flood lighting which tallys up to 20amps per hour at 12V
this build I want completed within the next 2 months ready for next winters mushie production and should be a good project to learn from before tackling the 5 kw Ac system next year, ideally I would like it near completed by july as I will be working on the second story of the hoophouse roof in winter installing panels.

I am very fortunate to have close friends on the property behind me that own a junk removal/ recycling business and at this point of time about 80% of the building materials used on the farm project have been sourced from them, about  six months back i scored 20 sets of tough books from them each with 2 sets of battery packs and a few NIB, laptops, medical equipment, scrap copper and building supplies arrive daily to my yard if i bribe the truck drivers with Dan Murphys Gift vouchers"as the junk gods only respond to prayers offered in exchange with alcohol"


I appreciate any advice on these builds and I will post full details of what the usage requirements are, and the materials that I have already sourced.
If there is any thing I should really keep an eye out for at the recycling centre throw me a pic as the boys there have no idea on what the have in the trucks.

Day (1) 18 months ago
Korishan likes this post
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#2
Over size the aircon or go with ice makers, make ice in the day with the solar and try and cool the area down in the day and allow it to warm up overnight. so you don't need as much battery capacity to run the aircon...  Also ground mount some panels if you can source some additional cheap panels, they don't have to be on a roof...

Get more solar installed on your neighbour(s) or ground mount and back sell power to them in the day from the solar output, finance the panels and build by selling back to them. Separate grid tied unit with a DC feed for each "customer". Turn the tables on the 70/30..


These units are handy as a customer export option... as you can set the output power and then switch it on/off when needed... they have timing adjustment for export delay, not sure about any "official" certifications so will probably get a "can't use them" confirmation.... they do work though.. :-)

https://www.aliexpress.com/item/New-func...21916.html
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#3
nothing beats anything that's free

My landlords at my residential lease just upgraded their 2 X 2.5 grid tie  system this week to a 6 kw  and were able to salvage the inverters one is fully operational the other has a relay fault which should be an easy fix, a few panels and all the connections/ pre-existing breakers isolators from the installers. 
I missed out on the rails. but its still a great score and kick-start to this project and has saved me about 800+
All of these were on the dinning room table when I got home last night including some of the owners electrical tools on loan that are better than my own.
   

I presume jaycar would be my best bet in QLD to purchase some spare replacement tips for this iron.

All the components for my cells are ordered and a few cheap chargers to speed up the charging and testing process, I really need to bulk up the quantity I can charge at once instead of replacing batteries every 8-10 hrs during the night to keep up the pace. at my current rate i am about 1/10th into my stockpile.

Now that my fingers and thumbs have healed from all the flashing cuts I can look forward to to the burns, fingers crossed hopefully I should have the first bank up and running by Xmas to replace my UPS .

and just a quick question: 
Has any one built a sliding rack mount for their cell banks? looking at something like petes system but horizontally. Considering a daisy chain of anderson conectors per cell for quick removal.
Korishan likes this post
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#4
(09-26-2018, 01:28 AM)rosco_argus Wrote: Has any one built a sliding rack mount for their cell banks? looking at something like petes system but horizontally. Considering a daisy chain of anderson conectors per cell for quick removal.

Yes some of the guys have the 18650 packs sitting horizontally on a shelf with terminations at the front.
You could do this in a rack as well with suitable depth & shelf sizes/strength for your pack sizes. You could probably get at least 4 packs across a shelf.

There's another recent thread discussing other connectors like XT150 & XT90(?) which are cheaper
rosco_argus likes this post
Running off solar, DIY & electronics fan :-)
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#5
There are a few of us that have racks. Instead of cabinets I built mine out of 2x4s and electrical conduit.
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#6
Thanks for the ideas not2bme and redpacket. its given me a lot to consider, I have salvaged a few ups racks and lots of shelves and draws like the images below

The atco/ demountable is 2100 high and has very little wall or floor space available that they will be stored in, with the tall racks I should easily be able to fit 2 bays  of 7 deep X 4 wide at 80 and have enough room above for the charge controller and inverter.
Thanks again guys for the comments, I will do mine similar to your lay out  no2bme but spun 90 degrees.
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