DIY Off Grid Solar - Mid Point Fusing & Battery Bank Rewire

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DIY Off Grid Solar - Mid Point Fusing & Battery Bank Rewire

Рет қаралды 5,108

7 жыл бұрын

I have been meaning to rewire my battery bank for a long time as I realized I could make the wires much shorter.
I have also been meaning to fuse my 1404AH battery bank with HRC fuses. I have used a mid point fuse configuration which actually protects the batteries and not just the wires.
DIY Tesla Power Walls videos:
Mid point fusing:
• Video
Fuses:
• Video
We are building a passive solar homestead and planning a big permaculture food forest, mandala veggi garden, swimming pond and much more!
Please visit our blog for more information on our project:
canmandala.com

Пікірлер: 53

@desertrat1206 7 жыл бұрын

That's a beautiful bank, MM. Good job. I can relate to your fiddling for perfection too. Although I'm happy with my bank, I've rebuilt the cooling system for my electronics 3-odd times already and have another revision coming up. This is how we learn.

@Mandalaman 7 жыл бұрын

thanks man. yeah this was definitely trial and error until i got it right.

@jwsolarusa 7 жыл бұрын

It looks way better than before. Good job Mate and thanks for sharing this awesome video video. Have a wonderful day day.

@Mandalaman 7 жыл бұрын

yeah looks a lot better!! It took some time and a couple of goes but am really happy with it now. thanks again and keep the videos coming! I really enjoy your channel. I think for us solar people the next best thing to building solar is watching others build solar lol ;) Have a great day too and thanks for your comments and support!

@Edgardocelectric007 6 жыл бұрын

Please don't follow his advise, no clue what the f he doing

@jumasmarty6643 2 жыл бұрын

excellence Job, I wonder sometimes my battery banks 48v, 12v cells shows one battery completely dead and destroyed from inside

@rockcityfpv9117 4 жыл бұрын

This helped me alot ... will have questions in the future.

@Dingbat217 7 жыл бұрын

Very tidy battery bank, well done! :-)

@Mandalaman 7 жыл бұрын

thanks mate! yes its looking 100% better. I topped up the water the other day and was a lot easier too, without all that mess of cables all over the place.

@jayl8813 6 жыл бұрын

Looks great. Going to do mine this way. Noticed my middle bank has a lower sg.

@Mandalaman 6 жыл бұрын

how many strings do you have in parallel?

@jayl8813 6 жыл бұрын

Mandala man same set up as your.3 strings of 4-6v 232 ah ea

@Mandalaman 6 жыл бұрын

so do you have three cables coming off to one terminal or are they paralleled and then you are coming off the whole bank with just one cable from pos/neg? if its the second one i think you would definitely see more even charging if you used a busbar as the current can go directly to the battery without going through the other. Im no expert though...

@jayl8813 6 жыл бұрын

Mandala man one cable from neg/pos. everything is pulled off pos and neg terminals. I will try and do a video

@jayl8813 6 жыл бұрын

I guess I'm wondering if I just add parallel connections through out the bank. So each battery in the bank pos and neg are parallel as well and keep 2 terminals for the loads as I do now.i think you called it matrix cabling. The fuse lines you added. I thinking maybe just add those but with my weld wire.

@rocky2615 Жыл бұрын

Thanks for sharing this information and your build. I am however wondering about the matrix wiring. I see that you have hook all the positive together as well as the negative in yhe battery bank. My question is do those wires go to anything like a balancing device or just used to tie all the positive and negative posts together to distribute the charge evenly?

@bradley200711 3 жыл бұрын

hello Mr. Mandala, can you show the final mid point fusing wiring of your battery bank? And did the 10 AMP fuses suffice? Thanks.

@andino2003 4 жыл бұрын

I Regards. What do they use to balance the charge of the batteries?

@joesmith3145 5 жыл бұрын

nice !

@sabinealexander2773 4 жыл бұрын

How many amps does each of your batteries have?

@c549m6 6 жыл бұрын

@mandalaman question those red small cables are they creating a parallel fig? If so, i thought the cables needed to be bigger to widthstand the amp/current..

@c549m6 6 жыл бұрын

Nevermind just found your other vid explaining why you went with those rea cables😁 thanks for sharing and posting👍

@psikovan 6 жыл бұрын

Hello, excellent vídeo but i have a question. What kind of fuses do you use?

@Mandalaman 6 жыл бұрын

hi, sorry for late reply. I have those big HRC fuses in the middle of each bank, then small 10amp automotive fuses on the small cables and I have a 300 amp megafuse on the positive cable coming from the inverter.

@leonleon7750 6 жыл бұрын

Hello, I would like to fuse my battery bank the same way with HRC fuses. Is it better with higher pre-arc and clearing voltages or should the values be lower. I don't know what it means so also how to calculate 😅 .. My system will be much smaller.. 3 banks to each 90ah 24volts.. so I thought about 45a each hrc fuse. Maybe I will buy et or fe variants of this fuses. Could you please give me any tips?

@Mandalaman 6 жыл бұрын

hi, sorry it was a long time ago when i calculated this and cant remember now, so cant help.

@jayl8813 6 жыл бұрын

Also what size fuse on the parallel convections ?

@Mandalaman 6 жыл бұрын

10 amp

@jayl8813 6 жыл бұрын

Have you seen a difference in charging. Is the sg even through out ??

@Mandalaman 6 жыл бұрын

no, the chargeing has always been pretty even. the wires are thick enough that it probably didnt make much difference that they were longer. just a lot safer and tidier this way.

@jayl8813 6 жыл бұрын

Do you think if I keep my bank wired the way it is now as 1 large bank (no bus bar) and add extra parallel connections it would even it out. I have everything hooked to 1 pos and 1 neg

@Mandalaman 6 жыл бұрын

the parallel connections will help somewhati think) as they allow some current to jump high resistence batteries as far as I understand. I looked at your channel and cant see any videos. why dont you do a quick one and upload it.

@tracibeacer670 7 жыл бұрын

That's better..

@Mandalaman 7 жыл бұрын

yes a lot!! thanks for your comment.

@immrnoidall 6 жыл бұрын

at 6;34 i see a box on the wall with a missing pop out .mice will pack that thing full of crap fast.

@Mandalaman 6 жыл бұрын

thanks, I will have a look and put some tape over it.

@immrnoidall 6 жыл бұрын

those mice took over my shed.

@Mandalaman 6 жыл бұрын

i havent had any issues with mice, but thanks for the heads up. will keep an eye on them pesky little critters ;)

@immrnoidall 6 жыл бұрын

what's the small red wires?

@Mandalaman 6 жыл бұрын

its called battery matrixing or laddering. Its to get a more even charge when you are running parallel strings. basically all of the positive and negatives are paralleled between banks so that some current can jump high resistance batteries.

@immrnoidall 6 жыл бұрын

i see a lead acid battery balancer on ebay.i got one for the two batteries.but they have them for 3 and 4 series too.

@Mandalaman 6 жыл бұрын

im not sure how they work or if they work, this balances your batteries without the need for another device. so far my batteries have charged very equal. I have not seen much different in the SG of the batteries.

@immrnoidall 6 жыл бұрын

i got the 2 x 12 one it 3 wires +,-,and the one that goes between the to bat. i see blinking lights.must be working? lol. i only tested on 2 small 7.5 ah bat. but it was working. i used on older and one newer and it was actually working.and on discharge too. benefits? it does have low cut off which could prevent one from going below 10.5 ,and a light to monitor voltage .i 'm also looking at your way. can you leave a link to your setup? hate to be dependent on this little box of unknown eBay gadgetry.

@Mandalaman 6 жыл бұрын

sorry, I dont have a link to a chart like that, just looked on google and couldnt find one either. Its just a normal series/parallel with all of the ++ - - connected on each battery. so the same as the battery balancer you bought but just with cables and without the box.

@immrnoidall 6 жыл бұрын

not many people realize to tape up those tools.

@Mandalaman 6 жыл бұрын

yeah, Im a numpty so better safe than sorry. thanks for your comment!

@immrnoidall 6 жыл бұрын

me too.i figured that out real quick and now keep the insulated tools by the batteries so i'm not tempted to grab a regular one.

@Edgardocelectric007 6 жыл бұрын

You really have no clue, what you are going to get hurt, playing with electricity will hurt you, green wire, looks pretty but you should follow proper color codes

@mick.Walker 6 жыл бұрын

Edgar Acosta I think you will find the ends of each wire are correctly colour coded.

@Mandalaman 6 жыл бұрын

the wire is green because that is the colour that that thickness of wire comes in here in Europe. They dont do black and red. Maybe they could employ you to tell the EU how to do things properly. Have you offered up your services? Someone with extensive knowledge such as yourself and such useful contributions such as "you really have no clue" is bound to be well sought after. Im doing fine by the way and so is my system but thank you for caring about my safety and your useful coment...