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Old 07-03-2015, 04:57 PM   #101
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Finally I found someone who may be able to help!

I just set up my solar array. I have two 245W panels connected to a Renogy 40CC MPPT charge controller, connected to two batteries in parallel. One battery has 122AH, the second has 100AH, and this is a 12v system. With one battery in the bank, the PV system worked great. After adding the second battery, the charge controller now says the batteries are full and has shut off power. Using a volt meter, both batteries read an output of 14.6 volts, however using a float hydrometer they only read one half to three quarters full. Why is this occurring?
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Old 07-23-2015, 09:46 PM   #102
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6v golf cart batteries with no breakers

Hi all,

We have been using a 12v battery to power our water pump and the the control panel for our refrigerator. We have not had time to install an electrical panel or circuit breakers so they have been directly connected to the battery below the bus. Now we have two 6 volt golf cart batteries in hopes that it will discharge slower. In looking at diagrams on wiring in series, the two batteries are wired - to + with the remaining - and + going to ground and the main electrical panel respectively.

My questions are:

Can I still connect my water pump and the control panel directly to one of the batteries? Perhaps one item to each battery?

If the two golf batteries are connected to each other, would connecting the water pump (for example) to only one battery ensure that it is receiving 12 volts?

Since we have no electrical panel, do I need to do something with the remaining positive battery post?

Please forgive my lack of knowledge about how batteries work- learning as I go.

Thanks for any input!

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Old 07-24-2015, 07:27 AM   #103
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Originally Posted by jjbirdy View Post
Hi all,

Now we have two 6 volt golf cart batteries in hopes that it will discharge slower.
I'll need an explanation on why discharging slower would matter for fridge. Also how long can you run a fully stocked fridge for on a 6V battery. (just your average fridge.)
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Old 07-24-2015, 01:23 PM   #104
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No you cannot wire each load to one battery, this will only be 6 volts. You must connect all 12 volt stuff to the remaining + and - terminals . Those same + and - terminals are used for charging and any 12 volt load you choose. I suggest you at least use an inline fuse for the water pump and the fridge. _
Quote:
Originally Posted by jjbirdy View Post
Hi all,

We have been using a 12v battery to power our water pump and the the control panel for our refrigerator. We have not had time to install an electrical panel or circuit breakers so they have been directly connected to the battery below the bus. Now we have two 6 volt golf cart batteries in hopes that it will discharge slower. In looking at diagrams on wiring in series, the two batteries are wired - to + with the remaining - and + going to ground and the main electrical panel respectively.

My questions are:

Can I still connect my water pump and the control panel directly to one of the batteries? Perhaps one item to each battery?

If the two golf batteries are connected to each other, would connecting the water pump (for example) to only one battery ensure that it is receiving 12 volts?

Since we have no electrical panel, do I need to do something with the remaining positive battery post?

Please forgive my lack of knowledge about how batteries work- learning as I go.

Thanks for any input!

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Old 07-24-2015, 01:26 PM   #105
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I have never seen a 6 volt fridge. By series wiring two 6 volt batteries, you now have 12 volts and usually more amp hours of discharge time. Think of it as 2 batteries are better than one.
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Originally Posted by cullengw View Post
I'll need an explanation on why discharging slower would matter for fridge. Also how long can you run a fully stocked fridge for on a 6V battery. (just your average fridge.)
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Old 07-24-2015, 01:30 PM   #106
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Quote:
Originally Posted by ird13 View Post
Finally I found someone who may be able to help!

I just set up my solar array. I have two 245W panels connected to a Renogy 40CC MPPT charge controller, connected to two batteries in parallel. One battery has 122AH, the second has 100AH, and this is a 12v system. With one battery in the bank, the PV system worked great. After adding the second battery, the charge controller now says the batteries are full and has shut off power. Using a volt meter, both batteries read an output of 14.6 volts, however using a float hydrometer they only read one half to three quarters full. Why is this occurring?
IRD


ird13,
the specific gravity test should work,
I would charge the up one day, then at night disconnect the batteries and let them sit disconnected all night, then check their voltage and the specific gravity,
12.6 or 12.7 is a full battery, less means it is getting old, below 12.4 or definately 12.3 and you may want a new battery, best to have identical batteries at least for the long term it is,

check the specific gravity also on each cell and keep notes,

I realize you may have plans for more batteries but you have panel charging capacity that is oversize for your batteries, depending upon how much power you use ever day you may want to disconnect one panel so you dont overcharge the batteries with too many amps,
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Old 08-01-2015, 01:09 AM   #107
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Is 5000w to much for my bus? Refrigerator microwave acc and toaster oven
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Old 08-01-2015, 05:38 AM   #108
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5000w inverter or solar panels?
5000w inverter is probably too big, a 2000w inverter will probably work, as long as you only microwave when the fridge is not running.

2000w of solar panels is about the most anyone could fit on a large bus, it would cover the entire roof
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Old 08-01-2015, 10:35 AM   #109
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I did the maths and could have done up t 2400watts on my 27 foot roof. Didnt need it, but i was curious.

I see a lot of questions here that would be answered by just improving an understanding of electricity--the relationship of power, volt, and current, and best practices. Im too scared of ruined wires (best case) and fires from unfused lines direct to batteries. Im worried that posters in here dont understand things like how to properly size wire based on load, etc.

The amount of energy stored in my batteries would be enough to burn my bus down and kill me a few times over. Ive done tons of research, and use both fuses and breakers to protect every wire run. Im not gonna tear out a pretty wall to replace a melted wire.

Im not tryna be a jerk, but buy a book or find some answers and best practices before you start messin around. Things can get dangerous really fast. If your working knowledge of electricity isnt sufficient to know how to wire a battery in series or hook 12v appliances up safely with fuses, you shouldnt be living on or allowing others to live on your bus for safety's sake.

Again, not tryna be a jerk, people make a living as electricians for a reason. Ive seen stock Buses catch fire from shoddy electrical repairs and they speed at which the burn is shocking. No pun intended
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Old 08-01-2015, 06:20 PM   #110
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I second that. You wouldn't go to an amateur dentist; don't sleep in a metal box wired by an amateur electrician.
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