Author Topic: y Philippines Retirement Solar Off Grid System  (Read 782 times)

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Offline Solarnewbee

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y Philippines Retirement Solar Off Grid System
« on: May 22, 2016, 08:09:43 PM »
So,,,,

I have received lots of great feedback from other like Oz, RF, Ross, Lachlan, Dan and others. Oz suggested I put my project here to keep better track and solicit feedback and please, kind criticisms so that I might improve the system overall.

Sketches to follow and pics.

 this will be a completely
I am working with the PowerJack 8000w LF pure sine wave inverter that's been blessed by Oz and I will be making adjustments recommended by same. Only difference being that mine has a built in MPPT solar panel charge controller and the toroid coil takes up all of the space to the left of the main and control boards, whereas Oz's had 2 toroid coils.

system will have as follows:

1). 20-300w poly panels 10 each on the eastern side of the 2nd floor roof and 10 each on the western side of same roof at the recommended 10 to 15 degree incline (southerly?)

2). 24v PJ 8000w inverter

3.) 1 2400w pma wind turbine connected thru an MPPT charge controller which includes an ATS function to switch to another       load, in my case to a dump load especially when winds exceed the need. DUMP LOAD, what is it? Ideas on best build for a dump load. resistor bridge? DC water heater? Space heater converted to 24v? Would greatly appreciate a sketch of a resistor dump load.

4). 2-2400w 120a MPPT solar charge controllers attached to the separate banks of 10 each panels.

5). 16-3.2v 200ah LiFePO4 batteries separated in 2 banks 8 each in series for 25.6v 200ah ea, then both banks paralleled for 400ah total (math?)

6). PowerJacks 3000w autostart 24w lpg genset in case of maintenance, special circumstances or other failures occurring.

7). Automatic electric transfer box in case of inverter failure to switch to Meralco.

8). Lastly (maybe, there is a lot more learning curve involved with coding Arduino and Raspberry Pi) microcontrollers to monitor and report system aspect such as inverter temps battery temps and voltage system wide along with those items the lcd monitors on the PJ are monitoring.
These Stats will be relayed via dyndns.org to an app on my iphone or iPad as well as sms text alerts to my phone via a gsm module.
I also desire the microcontrollers to not just read stats but take action such as taking control of the cooling fan in the PJ (zap spiders Oz :0), maybe shut down a bank of batteries, switch to to the grid if absolutely necessary (i'm going for off-grid because electric credits do me no good if it's only $1.25 to have the service on standby, reset the inverter automatically for re-try after overload or undervolt etc.

all for now.

SN


SN

Any day above ground is a day for potential mishaps

Offline Pete

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Re: y Philippines Retirement Solar Off Grid System
« Reply #1 on: July 08, 2016, 02:02:01 AM »
Hi Solar newbee, somewhere I saw that you were looking for a mud map of a delta connected load dump.
So here is one. If you put two of your 1 ohm resistors in parallel in each branch you will have a 0.5 ohms per phase.
If you go for three in each branch you will have 0.33 ohms per phase.
I guess you could start with one or two resistors in each branch and see how much braking it gives you. It is pretty easy to add more resistors in parallel if you need more braking.
Pete

Offline Solarnewbee

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Re: y Philippines Retirement Solar Off Grid System
« Reply #2 on: January 29, 2017, 03:02:07 PM »
Hey Pete

My second Dump load, first one looks similar. 1 ohm resistors in delta. I built 2 in case I need to halve the resistance. tell me what you think.
SN

Any day above ground is a day for potential mishaps

Offline Solarnewbee

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Re: y Philippines Retirement Solar Off Grid System
« Reply #3 on: January 29, 2017, 03:34:44 PM »
Installed recently on vacation. Not running due to contractor failing me on panels install. I would do it but at 295 I'm too heavy to walk on a tile roof without breaking the tiles.
SN

Any day above ground is a day for potential mishaps

Offline Pete

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Re: y Philippines Retirement Solar Off Grid System
« Reply #4 on: February 01, 2017, 02:34:49 PM »
Hi Solar, looks fine, did you put heat transfer compound under the resistors?
I am thinking that you could have an arduino monitoring the output voltage of the wind turbine, if the wind is too strong and the voltage goes over a set point, then the second dump load could be switched in automatically.
The project looks great, certainly a large installation, you should not run out of power.