How to build a Capacitive Battery Charger (Part 2) DIY 

Thankyou. I appreciate the effort you put into these videos.

Hi Kman, hi guys. About 3 weeks ago I finished to different capacitor charger like Kman explained. They work well and everything is well. Thanks Kman. Now, as I live almost Off Grid I was thinking to build a bigger charger that i could hook on my 3250 Generac Generator to charge my battery bank. This time it should be a 240 vac system. I know that with a 240 vac setup the amps double. I built the whole thing with four 80uF caps and three different switches, two 80uF caps together then plus one 80uF and plus one 80uF. With that I could choose between different loads. I tested the system on my main 220 vac and it worked well. The two 80uF caps together were charging with about 13 amps to my large 25 vdc battery bank, all together with nice 26 amps. It was rocking. So now I was good to go to hook it on my Generator. And puff, the fuse on my Generator blow out. I repeated and noticed that instead of only 13 amps for two working caps, it was running for about 1 second at about 26 amps. I was quite surprised and cannot wrap my mind around why suddenly my caps put the double of their rated amps out. 80uF normally put about 3 amps on 120 vac, on 220 van they put about 6 amps, but on my Generator they put even 13 amps on 240 vac. Could it be because of the square wave form or what. I do not know what is wrong. So, if you guys or Kman itself could find some time to explain, it would be very much appreciated.

thank you. last video did not show the AC connection. is the voltmeter connected to rectifier at pos and neg terminals?

Great video where does the multi meter get wired into?

good video Please let me know exactly capacitor picture not clear ? where to get it Thank you Tony

Thank you for your help. ..I completed my charger and it works exactly like you said soo thanks again ... gad bless you. ...

the cap is a smart electric part # se553 run cap.. specs r 60/5x370

I know this is a simple circuit but just to be safe would you provide a wiring diagram?

How we know that the battery is fully charged? i am asking because in a 70Ah car battery i used, i was checking every 2 hours with a multimeter the volts. It started charging at 46 volts, dropped to 14,5 after many hours, and when i reconnected it to the charger again after 1 day of relaxing, it was charging with 15.7 volts and was going up to 16.5 volts . The battery has a charge of ~13.1 volts when sitting now. Is it ready to be used or it needs more??

could you use a dual run capacitor and a switch to make a fast charge/slow charge set up in the same enclosure?

Hi. Do you know why the black lead is connected in the 10ADC jack instead of -COM? I see that it's measuring DC voltage and I expected it were in the -COM jack.

good video

What size of a bridge rectifier did you use for your 12v battery charger?

Can you power thru inverter 120vac

this will De-sulfate a dc battery? I subscribed thanks for this video...

What is the modification needed to have more battery de-Sulfation instead of charging ?

hi Kman, love the videos. Quick question, what would you change to make it just a de-sulfator, less charger. thanks.

Awesome Creation Dude!!! I Have a running capacitor but it has 3 prongs at the top, so how would i connect to your setup!!

Do you have a wiring diagram for this seup?

What about fuses for the system? How many and where? Thanks

total amp is close to a 1000ah. i have now a 12v but i am buying a 48v inverter soon. and the hrs 4 to 6 thanks for the fast respond

Ciao ho messo la batteria sotto carica,con raddrizzatore a ponte e condensatore 25uf Quando ho attaccato,la batteria segnava 12,20 V ,poi passati 3 ore segnava 11,50 Passati 12 ore segna 10,50 V Come mai tende calare di tensione? Grazie

To extend the life of the Bridge and the Capacitor, you need to add a surge resistor between the positive of the bridge rectifier and the positive of the capacitor. Any where between a 1-5 ohm wirewound power resistor should work. During the first half cycle of the AC, there is almost '0' ohms on the capacitor which could damage both the cap and the bridge. A fuse is essential especially if you turn it on and walk away. A slo-blow of about 2-3 times of the normal input current.

And what size capacitor did you use?

If you were running this same charger setup on 240v and you touched the aligator clips with your hands then wouldn't you just be shocking yourself with around 240-270v dc? That sounds a little dangerous to me, so how do you offer / provide protection to make the charger a little safer when used on 240v ac thanks. I'm still a little lost as to how the charger can automatically reduce the voltage down enough for a 6v or 12v battery also without damaging the battery?

How can you attach the rectified voltage of around 125 V DC to a 12 V battery? For that's what this will supply at the Plus and Minus terminals.

Wiring diagram please ?

Gmorning dude, a quick question can u post another video with a running capacitor that has the 3 prongs instead of the 2, im still trying to figure out where to connct the wires, thanks dude,any help would be greatly appreaciated..

I built a charger for a 24 volt battery bank and it only seems to out out 22 volts when on the battery!

sweet!

how much it will cost to build one of this to charge a 12v,24,36 or 48v battery bank for solar system ( no joke ) thanks i like it.

so you are going to charge a 12 volt battery with 110- 120 volts dc

Hi l have a capacitor for my charger but it has 3 conectors . Pleas tel me wish ones tu conect...

Hi again FriendI need your help building a charger for this smaller Battery. UPG 85989/D5779 Sealed Lead Acid Batteries (12V; 8 AH; UB1280F2) . Please help me with the size Capacitor and Bridge Rectifier. How long should a battery of this size be charged? Any help? Your have been a tremendous help in my working parts and Chargers. Thanks Don Jackson

Hello bro this is Ratheesh and I have a doubt ,, that how can I chose the capacitor for the various amps battery ,, can u suggest me for this or send me the details for it

Hi how are you, with 100 mfd cap, how many amp i can get?, i have a bank of battery 60v 120ah, in how many time you think y can charge the batteries

This is a 120 volt system right??? Don

Wire size awg please?

does this hit the battery at 60hz? or dc?

Terima kasih banyak .....

Fuse?

have you ever heard of charging a battery with static electricity ?>

I bought instruction from Avasva and I build it very very cheap.