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I missed up please help

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Flyingjeep

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May 27, 2020
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I messed up and bought 8 V batteries thanking my inverter was 12 or 24 V it’s 12 Best Way to resolve this issue. 3000 W inverter 800 W of panels and over 1000 amp hours of batteries
 
Do you have a link to these 8V batteries? That is peculiar.

Perhaps you are not looking at the rated nominal, and instead the equalize/absorption voltage?

Quite possibly, your 8V battery is just a 6V battery that needs 8V to equalize.

Edit: Wow! 8V batteries are used in farm equipment and some golf carts. I had no idea: https://www.batterymart.com/c-8-volt-sealed-lead-acid-batteries.html
 
6V FLA need to be equalized at 8.1V:
FireShot Capture 658 - Battery Maintenance - Trojan Battery Company - www.trojanbattery.com.png

I would try to return them if they are true 8V batteries. 6/12/24V is easier to build user friendly voltages.
 
I messed up would it be best to buy a different inverter I have six of the batteries or get a step down inverter to go to my main inverter what would you do most cost efficient I am running an off grid house or trying to
 
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Flyingjeep said:
I messed up would it be best to buy a different inverter I have six of the batteries or get a step down inverter to go to my main inverter what would you do most cost efficient I am running an off grid house or trying to
Click to expand...
I’m not going to be able to return the batteries
 
Sounds like 24V is the best way to go. Be sure to select FLA setting as the charge profile on the charge controller.

Read the equalization instructions on the trojan website. It requires some maintenance to keep those batteries happy. I like to water/equalize weekly if possible. Takes work but helps a lot.

Wait is that a 12V or 24V inverter?
 
Will Prowse said:
Sounds like 24V is the best way to go. Be sure to select FLA setting as the charge profile on the charge controller.

Read the equalization instructions on the trojan website. It requires some maintenance to keep those batteries happy. I like to water/equalize weekly if possible. Takes work but helps a lot.

Wait is that a 12V or 24V inverter?
Click to expand...
12v ??‍♂️
 
Just swap out inverter if you cannot swap out the batteries. Only way to do it safely. 12V really won't work because those cells need equalization. It is crucial.
 
Do you think you’ll be more cost efficient and hook them up at 24 and step down to 12 ?
 

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To get a "normal" voltage quantity out of these batteries, you'll need to go with a 3s2P configuration. Three batteries in series, then both series connected in parallel. If I have this right, you'll get a whopping 340 amp hours from this configuration. Not 1000 amps.

The question I have, is it worth the hassle of changing inverters? If you don't have to power DC items then maybe it's not a big deal. On my RV trailer, the hassle of 24v would be more than I'm willing deal with.
 
HRTKD said:
To get a "normal" voltage quantity out of these batteries, you'll need to go with a 3s2P configuration. Three batteries in series, then both series connected in parallel. If I have this right, you'll get a whopping 340 amp hours from this configuration. Not 1000 amps.

The question I have, is it worth the hassle of changing inverters? If you don't have to power DC items then maybe it's not a big deal. On my RV trailer, the hassle of 24v would be more than I'm willing deal with.
Click to expand...
I have 12v RV lights and water pump hooked up
 
Flyingjeep said:
I have 12v RV lights and water pump hooked up
Click to expand...

If you go with a 24v battery bank then you'll need a step down converter (24v -> 12v). That's the part that I didn't want to deal with. It's always on, unless you make it a switched device, and there are conversion losses. In my case, the lure of 48v was attractive. But the complicating factors convinced me to keep it simple (12v).

I have an RV that is my solar/battery focus, so I can identify with your situation. The other thing I'll point out is that those batteries are dang heavy. 63 lbs each times six is 378 lbs! There isn't enough room in my toy hauler to store that many batteries. I'm looking at an 8 cell LiFePo4 battery bank configured as 2p4s for 12v. My current dual Trojan T-105 bank weighs 124 lbs. The new LiFePo4 battery bank will weigh 92 lbs and give me far more amp hours than the Trojans will.
 
Flyingjeep said:
The batteries are saying 170 ah. x 6 1020 amp hours ??? I’m new at this and trying to learn thank you everybody for the help
Click to expand...

You can't calculate it that way. Batteries connected in series step up voltage, but the amperage stays the same. Batteries connected in parallel step up amperage, but the voltage stays the same.

Sorry to break this to you, but you don't have as much juice as you thought. I made the same incorrect calculation at one point.
 
24 V inverter for what I need is around 400 bucks I might be able to sweet talk my way back are these batteries which I have about 400 in what would you do
 
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