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Author Topic: Solar panels wired to 12V batteries in parallel  (Read 2030 times)
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Earth
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Please help me connect these batteries correctly and reach my inverter TARGET = 1000WATTS.
My current setup only gives me 600W-630W. And where would i connect a generator?
Here is what my current setup looks like with four batteries outside and five inside.



and before you say "you cant put that gel one there dude!"
and i will say "prove it knucklehead"
« Last Edit: January 29, 2013, 08:08:10 pm by TrailerTrash » Logged

Webmaster living off grid in a camper with 300watts of solar panels charging 9 absorbed glass mat 12V batteries. i own about 40 dot coms. i

Fort Lauderdale, FL
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Baldengineer
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Without isolators, your batteries are going to be constantly discharging each other.
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Earth
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Without isolators, your batteries are going to be constantly discharging each other.

whats this isolator look like. can you draw where it goes?
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Search google for "battery isolator".

Very popular in the marine industry and among auto-car stereo guys. (Folks who need multiple batteries in parallel. )
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Earth
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Search google for "battery isolator".

Very popular in the marine industry and among auto-car stereo guys. (Folks who need multiple batteries in parallel. )
so is my wiring correct?
does this battery isolator use power? gimme a link or a picture. and where do i put it?
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so is my wiring correct?
Yes, if your goal is to barely charge the batteries and have them discharge each other.

does this battery isolator use power?
Typically it is a array of diodes.

gimme a link or a picture
Gimme?  I realize it is in the internet, but manners are still appreciated.

https://www.google.com/search?q=battery+isolator
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Earth
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i know the five inside should be connected like this. but i cant fit under my bed anymore.
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Earth
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so is my wiring correct?
Yes, if your goal is to barely charge the batteries and have them discharge each other.

does this battery isolator use power?
Typically it is a array of diodes.

gimme a link or a picture
Gimme?  I realize it is in the internet, but manners are still appreciated.

https://www.google.com/search?q=battery+isolator

my bad, i have aspengers syndrome. i am unthoughtfull
can someone please show me a picture or a link of this thing?
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Earth
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here is a blank so someone can draw the lines for me .....please. lol.

i never say please and thank you on the internet.
i have not learned that yet.
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Earth
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is this thing green or blue?
my batteries cant discharge anyways. my controler stops that
« Last Edit: January 29, 2013, 03:01:18 pm by TrailerTrash » Logged

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I'm no expert, but I can offer a couple of tips:

1. The solar charge controller needs to be isolated from the feeds to the Inverter and Trailer, or else the power from the solar will not charge the batteries when the system has any draw.
2. The batteries need to be isolated to prevent them from simply discharging each other http://vandwellers.org/isolator/index.html
3. The Trailer and Inverter need to be connected at the same point in the chain, and also isolated to prevent them from competing for the current - a distribution panel is the best option there.
4. Check to ensure that all of the batteries are deep cycle. If you mix deep cycle and non deep-cycle then you will wear out the batteries much faster, and will only get 20% of the rated time as the non deep-cycle batteries will give out of power and break the circuit, becoming resistors.

Reference http://analoglogic.net/projects/solar_charger/solar_charger_system_diagram.png- treat the battery band as a single unit battery once you have each battery connected in parallel and isolated.
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i know the five inside should be connected like this. but i cant fit under my bed anymore.

Try sleeping on top and putting the batteries under the bed. smiley-razz
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I'm no expert, but I can offer a couple of tips:

1. The solar charge controller needs to be isolated from the feeds to the Inverter and Trailer, or else the power from the solar will not charge the batteries when the system has any draw.
If you are using any power off the system when the sun is shining some of that power is going to go to that load. Whether it comes from the Solar Panels or from the batteries is immaterial. Power is supplied by the solar panels to the batteries and any load. The only way to ONLY CHARGE the batteries is to disconnect ALL LOADS and connect ONLY to the batteries. If the solar panels can supply more power that the load requires the batteries will charge. If the load draws more current than the solar panels supply the batteries will discharge.
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2. The batteries need to be isolated to prevent them from simply discharging each other http://vandwellers.org/isolator/index.html
A isolator is required if one battery is wired to the vehicle starter and ignition to prevent you from discharging all the batteries in a worse case situation. If you run down the starter battery you can't get get the rig running and can't get home. If you have each battery on an isolator then you will have multiple batteries, and the batteries can't share the load between them. Only the battery for the vehicle starter needs to be isolated...
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3. The Trailer and Inverter need to be connected at the same point in the chain, and also isolated to prevent them from competing for the current - a distribution panel is the best option there.
A distribution panel is a good idea because it gives you a common point where you can easily disconnect power from the loads. It has a safety function. The trailer and the inverter ARE connected at the same point - across the 12V battery bank.
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4. Check to ensure that all of the batteries are deep cycle. If you mix deep cycle and non deep-cycle then you will wear out the batteries much faster, and will only get 20% of the rated time as the non deep-cycle batteries will give out of power and break the circuit, becoming resistors.
Only suggestion that make sense. Different battery types have different behaviour as they discharge. Best to have all batteries of the same type and same age.
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Reference http://analoglogic.net/projects/solar_charger/solar_charger_system_diagram.png- treat the battery band as a single unit battery once you have each battery connected in parallel and isolated.
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Fuses?  Where are the fuses to protect from shorts/fire?
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Ontario
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You have three different cell types -- flooded, AGM and Gelled electrolyte -- all on the same string.  These all have different charge, equalization and float voltage requirements.
You will likely have battery lifespan issues and may find it hard to assess state of charge.  'course I see some cranking batteries in there, so poor lifespan in a deep-cycle application is a given.
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