Connecting two Harbor Freight 35-AH AGM batteries together in parallel. 

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Good luck on your minivan project. Thank you for your comment.

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I hook my charge controller up to just one of the batteries and that seems to charge all the batteries in my bank evenly. But I can understand why other people say you should split them between both batteries. But how I do it works well for me. Let me know how it works out after you decide what you're going to do. Thanks for your comment.

I used the nut and bolt that came with the batteries when I purchase them. So I don't really know the size I never measured them. I am pleased you enjoyed the video. Thanks for your comment.

I would suggest a 100ah AGM battery. This would be more efficient in the long run, and less expensive. Extra tip - the fan on low draws substantially less current than running the fan on high. Let me know what you decide. Thanks for the comment.

I recommend disconnecting the batteries and charging each one individually to see if you have a bad battery. Thank you for your comment.

Welcome and thanks for your comment.

The gauge you use is dependent on the amps going though the wire. 10 gauge will handle up to about 30 amps. The 4 gauge I use will handle around 100 amps. Look at your load and then decide. Thanks for the question.

Actually, 6AWG is sufficient per stats for 'this' amount of amperage. 4 is not needed per se...BUT this is also pending how MUCH length you have or are using...

Yes. You can connect 3 AGM batteries in parallel. Thanks for your comment

Connecting to one battery will charge your whole battery bank. Thanks for your comment.

@@shoestringprep is there a way to hook these batteries to a solar charging system and also hook up another charger powered by a generator? What would that circuit look like?

I would need to know what size inverter you would need. How many watts will you be using? Below is link of one of my videos on how to find out how many watts you will need. Your equipment may also let you know the watts. Thanks for your comment. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-sqPpCOczlQQ.html

I have had up to 4 of these types of batteries connected in a bank. I charge all my batteries connected together. Thanks for your comment.

I have no knowledge of solar water pumps. So please come back and let us know how it worked for you. Thanks for your comment.

Connecting positive to negative is connecting the batteries in series (not in parallel). In series, the voltage is increased while the amps stay the same. In parallel (as I did) the voltage stays the same but the amps are doubled. All my systems are in parallel because I want a 12-volt system. Thanks for the question.

George, by hooking up your inverter using the negative from one battery, then the positive from the other battery, you discharge both batteries evenly. Hooking up both to the same battery will discharge that battery further than the 2nd battery and not evenly.

If the batteries are going to be inside with you, please go with AGM or some other sealed battery. The number of batteries you will need will depend on how many watts your tv and fridge draw and how long you will be running the devices daily. If you find you need to add batteries to extend the time for your devices, add each new battery in parallel.

Welcome new subscriber. I will make a video adding the solar panels. The batteries connected in parallel do charge the batteries at the same time. Thanks for the comment.

I would like to, but I don't have that many 100-watt solar panels from harbor freight. Thanks for asking.

13.0 volts for a AGM battery. Thanks for your comment.

@@shoestringprep Awesome thank you so much so when it hits 13 I need to unplug it from the solar panels so that I don’t overcharge it

@@bradeninman1591 your charge controller should do that. If not then you can unplug it. Thanks for your comment.

Welcome, new subscriber - Yes, putting four batteries works very well. Have done that many times. Thank you for your comment.

Here is a link to show how a simple solar power system is set up: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OMuoqOyGL7w.html Here is also a link to how solar panels are connected: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-a3p97vNpU2A.html Here is also a link to how an inverter is connected: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-UzZKAaGlY-Q.html After these videos, please let me know if you have any other questions. Thank you so much for your comment.

Appreciate your subscribing. Thank you for your comment.

You can use battery cables to connect the two batteries together. Thanks for your comment.

That is one way to do it. Thanks for your comment.

By 50% usage, I mean the depth of discharge. In other words, you permanently damage your battery if you drop the voltage too low. I recommend never letting the voltage drop below 12.0 volts. Thanks for the question.

70 amps is about equal to 840 watts Use that to calculate your useage. Thanks for your comment.

I would as long as they are both the same voltage when you connect them together. Thanks for your comment.

The 4-gauge cable I bought was from a local auto parts store, but they are also sold online. Thanks for your comment.

Also car audio stores

Yes they can. Mine do Thanks for your comment.

@@shoestringprep freakin sweet! Saving this video. Thank you for letting me know!

Thanks

Excellent question. A 12 volt battery can charge up to 13.9 volts in the charging process, and then will drop down again when you put a load on it. Thanks for the comment.

Thanks for the tip and the comment.

I don't know about power chairs maybe somebody else out there does. Thanks for your comment.

@@shoestringprep Thanks Again, i Appreciate Your Honesty. I Am Still Going To Copy Your Microwave SetUp For My Tent Trailer. I Like That I Don’t Hafta ReInvent The Wheel

@@timothyaguilar7727 let me know how it works out.

I don't understand your question. Please rephrase it

I don't drain batteries. I charge new ones up to their full capacity and then add them to my battery bank. I hope this helps. Thanks for your comment.

Thanks for your comment.

Good idea. Thanks for the comment.

If all the batteries are the same voltage when you begin the charging they will all charge evenly and more efficiently. You can charge the batteries at different rates but it's not really good for the long-term health of the battery. Thanks for your comment.

Thanks for your comment

I will put that on my video list. Thanks for the comment.

@@shoestringprep Thank you. 👍

@@squeekieballs5052 🙂

I don't use a fuse when I have two batteries in parallel. Thanks for your comment.

These we old batteries. Thanks for your comment.

I connect my inverter to the battery Bank the same way as I would connect any converter to any single battery. Thanks for your comment.

Thanks for your comment

I was showing how to connect the batteries. I did not connect a charge controller. Thanks for your comment.

Thank you for subscribing. I have always connected the ground first. You should do things the way that works best for you. Thank you for your comment.

@@shoestringprep not quite what I meant, but ok., I'll explain again, not talking about what is hooked up first, I'm talking about the placement of the main pos and neg terminals shouldn't be on the same battery or am I wrong. It has to do with even charging and discharging across the batts evenly. If you have 3 batteries then take main pos from batt1 and then main neg from batt3, not batt1 neg, otherwise the battery with both main terminals drains faster, it has to do with electron flow I think. Anyways no big deal , just a question. I've recently put a small system together and was curious about our different methods, I dont think it's a "do what you want thing" I think there is an optimal method for parallel battery connections

If you connect your batteries positive to positive and negative to negative, it's called connecting in parallel. It keeps the battery voltage the same but extends the amp hours. If you connect your batteries positive to negative and negative to positive, that's called connecting in series. Your voltage is increased - two 12-volt batteries, for example, become a 24-volt system but your amp hours remain constant. Thank you for your comment.

@@shoestringprep i give up. keep up the vids. adios amigo

@@uncle_creepy2743 yes that’s the correct way to do it so the power flows evenly.

Thank you for your comment.

@@shoestringprep your welcome. Happy to help. Thank you for the video.

What is a diode?

Do you know that makes no difference? I have tested this many ways and they all charge and discharge the same. Thanks for your comment

Figures you would say something like this. You are wrong and you testing makes this right?? Too Funny

Thanks for your comment.