12v hut setup..

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12v hut setup..

Postby FNQBunyip » Sat Jul 19, 2014 9:51 am

I want to setup our bush hut with a 12v system .

I've got 6 x 12v 10w flood lights
an 80lt engel that runs as a freezer
a 40lt engel as fridge

I also want to run a small inverter some nights for a fan

I've been running the 2kva honda and using 240v lights ect but got these 12v ones and they rock
so lets get the system setup too do most of the work for free...

Would this MPPT http://www.ebay.com.au/itm/310696704578?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

and 2 of these http://www.ebay.com.au/itm/201040566308?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

be a good start ? I'm thinking about 350ah in battery as I can always run the honda and a ctek charger for wet season days ..And run the engels on 240v while charging ..

Anybody had experience with this marsol mob ??
Open too any advice or ideas .
Thanks in advance ..

Cheers
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Re: 12v hut setup..

Postby Gordon-Loomberah » Sat Jul 19, 2014 10:18 am

I haven't heard of them before, but I'd be a bit concerned about the charge controller- you do tend to get what you pay for with them, and I also wonder if it really is MPPT.
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Re: 12v hut setup..

Postby FNQBunyip » Sat Jul 19, 2014 11:15 am

Ok thanks for your input Gordon , the other thing I just noticed was it's only rated too 380w input on 12v , so the 2 x 200w panels would be too much for it ..

So do I NEED a MPPT or would PWM be sufficient ?

I'll keep reading and looking for the right bits .

cheers
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Re: 12v hut setup..

Postby Gordon-Loomberah » Sat Jul 19, 2014 11:25 am

You don't absolutely need MPPT, but it will get significantly more energy from your panels, since it lets the panels operate at their maximum power point, which is well above the battery voltage, and that is where PWM controllers force the panel to operate. With good quality MPPT charge controllers, you can operate a string of panels well above battery voltage, which reduces losses due to cable resistance by allowing a much lower current flow, or it can save money by allowing smaller cables to be used. MPPT is especially useful for when there is a long distance between panels and battery/charge controller.

400W isn't necessarily too much for a 380W max charge controller to accept. Have a read of this thread:
solar-wind-gear/topic5064.html

Oh, I forgot to mention earlier- be very careful with cheap inverters from ebay, they can be incredibly inefficient, especially when powering small loads. Much better to have a look around for a good quality 2nd hand unit from Latronics or Selectronics, both Aussie made and very reliable.
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Re: 12v hut setup..

Postby dinkum » Sun Jul 20, 2014 8:44 am

g'day , FNQ, i borrowed one of those regulators and they are one stage only, ie no boost or absorb stages and it was'nt even pwm, just fast series switching...dennis..
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Re: 12v hut setup..

Postby FNQBunyip » Sun Jul 20, 2014 8:56 am

Ok thanks Dinkum .. I've started to look into better quality controllers now .. Looks like I will need to go to a 40a ...

I read your link Gordon , and think my site requires as much as I can get most of the day , best sun exposure is from around 07:00 till 14:00 ..

Anyone got an online source for good panels 12v 200w ???

It seems that as soon as you look into 12v systems its only about camping , not really setting up a large 12v hut ..

cheers
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Re: 12v hut setup..

Postby dinkum » Sun Jul 20, 2014 9:05 am

i just had a quick look on ebay..theres a used PL40. $120.00 no bids yet [i paid $250 recently ].these are bullet proof,fully programmable and excellent resale value.. search for plasmatronics...dennis..
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Re: 12v hut setup..

Postby FNQBunyip » Sun Jul 20, 2014 9:17 am

Thanks , its in my watch list now ..lol
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Re: 12v hut setup..

Postby Gordon-Loomberah » Sun Jul 20, 2014 9:19 am

If you went to an MPPT charge controller, then you could use 24V panels, which are much more commonly available, and often less expensive too. If you go with the PL40 Dinkum mentioned, you'd probably want to use an extra panel over what you'd need with MPPT.
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Re: 12v hut setup..

Postby Bthree » Sun Jul 20, 2014 2:47 pm

Here is another 200watt panel, much the same price as the ones you found
I have some of these, they put out a good 10amps each in the summer
up to four would work perfectly on a PL40

http://www.ebay.com.au/itm/New-200-Watt ... 3390eecf1f
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