hello i have 2 x 12v batterie(SLA) linked in parallel

my question is.. if i charge those two batteries using a 12v wall charger... and i drain said batteries simultaneously... does the dc to ac inverter get any of the electricity from the land power (because all alligator clamps are touching each other on the battery posts) or does the wall charger power actually sink into the batteries before going into the dc to ac inverter ?????

i ask this because i currently reside in a country (Philippines) where the electricity is harmful to computer components.. and im hoping that charging the batteries and having a pure sine wave dc to ac inverter that the 2 batteries somehow... you know.. stabalize or "clean" the electricity.... im just worried about all the clamps touching each other at the battery posts and some of that not so cool power heading straight for the costly dc to ac inverter

PS: im french Canadian sorry if my engrish no good

 

Welcome to Allaboutcircuits.com

But I'm wondering if I have two lipos and connect them in parallel to increase capacity of my pack, wont there be sparks when I initially connect them? Isn't there going to be a large current flow regulated only by the internal resistance of the batteries?

So if one is like 4.2V and the other is 4, couldn't the discharge current of one and the charge current of the other, exceed their specs?

Do I need to charge both as close to the same as possible to reduce this?

Any best practices when assembling the pack?

Do they self balance and can I charge them just as if I was charging one alone?

my question is.. if i charge those two batteries using a 12v wall charger... and i drain said batteries simultaneously... does the dc to ac inverter get any of the electricity from the land power (because all alligator clamps are touching each other on the battery posts) or does the wall charger power actually sink into the batteries before going into the dc to ac inverter ?????

But I'm wondering if I have two lipos and connect them in parallel to increase capacity of my pack, wont there be sparks when I initially connect them? Isn't there going to be a large current flow regulated only by the internal resistance of the batteries?
Maybe, probably not a problem, but if you are concerned, just discharge each battery through a resistor before you to them in parallel.


So if one is like 4.2V and the other is 4, couldn't the discharge current of one and the charge current of the other, exceed their specs?

Yes, that would be a problem.

Do I need to charge both as close to the same as possible to reduce this?
Yes, toward this, It would be best to keep the two batteries in parallel all the time.

Any best practices when assembling the pack?
I leave this to somebody who knows more about this.

Do they self balance and can I charge them just as if I was charging one alone?
If these are in parallel, you should be fine charging the parallel combination as if they were one. They may not share current equally, that is a function of the condition (state of charge, condition of electrodes, etc.) of the batteries.

Does the dc to ac inverter get any of the electricity from the land power (because all alligator clamps are touching each other on the battery posts) or does the wall charger power actually sink into the batteries before going into the dc to ac inverter ?????

Which clips are touching each other?

If the batteries are recharged while the DC to AC inverter is running, the DC to AC inverter will take current from both the battery and the charger.
This is usually not a problem.

 

Welcome to Allaboutcircuits.com





But I'm wondering if I have two lipos and connect them in parallel to increase capacity of my pack, wont there be sparks when I initially connect them? Isn't there going to be a large current flow regulated only by the internal resistance of the batteries?
Maybe, probably not a problem, but if you are concerned, just discharge each battery through a resistor before you to them in parallel.


So if one is like 4.2V and the other is 4, couldn't the discharge current of one and the charge current of the other, exceed their specs?

Yes, that would be a problem.

Do I need to charge both as close to the same as possible to reduce this?
Yes, toward this, It would be best to keep the two batteries in parallel all the time.

Any best practices when assembling the pack?
I leave this to somebody who knows more about this.

Do they self balance and can I charge them just as if I was charging one alone?
If these are in parallel, you should be fine charging the parallel combination as if they were one. They may not share current equally, that is a function of the condition (state of charge, condition of electrodes, etc.) of the batteries.
they shouldnt need to self balance as i charge and draw power from positive from battery one and negative of battery two

Does the dc to ac inverter get any of the electricity from the land power (because all alligator clamps are touching each other on the battery posts) or does the wall charger power actually sink into the batteries before going into the dc to ac inverter ?????

Which clips are touching each other?
RED clip of battery charger and RED clip of dc to ac inverter on positive terminal

same applies for BLACK clips for both on negative terminal...

If the batteries are recharged while the DC to AC inverter is running, the DC to AC inverter will take current from both the battery and the charger.
This is usually not a problem.

so basically by doing this im not protecting my pc components in anyway ?
or should i swap the charger clamps to the OTHER terminals
or should i charge and draw from the same pos and neg terminals ?

and thank you for the welcome

 

To what are the alligator clips connected?

Are you shorting out the battery pack - that would be bad.

I worry about what is touching what (you wrote "...all alligator clamps are touching each other on the battery posts."

 

im sorry, i dont think you smy reponse

here you go

Which red cclips are touching each other?
RED clip of battery charger and RED clip of dc to ac inverter on positive terminal of battery 1

same applies for BLACK clips for both on negative terminal... of battery 2
both batteries are joined via a 1/0 cable positive to positive and negative to negative....
if you can tolerate a retarded celine dion accent, i can take a short video to paint you a picture in your mind

 

i just saved you from an aneurysm.. just a photo... no video with some guy speaking like that horrible singer Celine Dion (NO we dont all like her)
kindly forgive the mess...
yes im aware that the connection between positive to positive and negative to negative are both red.. that gauge cable only came in red.... ... nothhing is being shorted.. each battery cost me roughly 5000 php.. whhich is rooughly 100$usd.. and in cad... id rather not discuss just how badly my currency is doing....

 

Since the shorted alligator clips appear to be intended to contact the same terminal I don't think you have anything to worry about.

 

Since the shorted alligator clips appear to be intended to contact the same terminal I don't think you have anything to worry about.

good, so am i somehow filtering out bad electricity by doing this or not at all ?
not sure where i got that idea , but in my current deployment im forced to use electricity from the Philippines which is known for having irregular voltages , something called static ... i believe the term is called "dirty electricity" and no im not being racist...
also i do not have a grounding hole for all the outlets in my home. i instead scratched a small spot on the earthquake beam in my home and have the copper portion of an extension cable making contact between that and the grounding prong of my pc to it, im told all earthquake beams are making contact with each other and they have at least 4 that go 1.5 meters into the wet ground.. but are encased in cement... i'm hoping that is enough....

 

I did something similar, using the metal sliding doorframe to the balcony door in an apartment I had. It worked (I guess) so I had an electrician come in and run a ground wire from the electrical box to the doorframe.

The length of your ground wire should not affect reliability, except in the case of "poorly placed" lightning strikes that could cause a voltage drop along that wire.

 

good, so am i somehow filtering out bad electricity by doing this or not at all ?
not sure where i got that idea , but in my current deployment im forced to use electricity from the Philippines which is known for having irregular voltages , something called static ... i believe the term is called "dirty electricity" and no im not being racist...
also i do not have a grounding hole for all the outlets in my home. i instead scratched a small spot on the earthquake beam in my home and have the copper portion of an extension cable making contact between that and the grounding prong of my pc to it, im told all earthquake beams are making contact with each other and they have at least 4 that go 1.5 meters into the wet ground.. but are encased in cement... i'm hoping that is enough....

Not racist at all, I've lived off and on in the Philippines since the 70's. For my last house there I built a 'technical' separately derived power grid of an isolation transformer (ISOREG) to break the nasty utility grounding (or the lack of) and connected my own grounding rod to the secondary side of the ISOREG, then to a UPS for sensitive appliance power. This was totally isolated from the utility power.

Things with motors (AC/REF, etc ...) were still on the utility side but used those cheap switched/tapped autotransformer voltage regulator boxes to try and keep them running when the brownouts happened every afternoon.

 

I did something similar, using the metal sliding doorframe to the balcony door in an apartment I had. It worked (I guess) so I had an electrician come in and run a ground wire from the electrical box to the doorframe.

The length of your ground wire should not affect reliability, except in the case of "poorly placed" lightning strikes that could cause a voltage drop along that wire.

thank you, although, im certain the thickness of the grounding wire is insufficient to handle 10,000 volts of a lightning strike, i only do this to not feel a buzz each time i touch the metal frame of the pc... and yes i did lose the last pc, a technician said the psu and cpu were fine but the mobo was kaput (German slang for dead) but that was from last year when i was staying on another island in the Philippines (7000 to 8000 islands, it is a miracle they manage).. and THAT place of residence also had no grounding prong.... so ive been kinda pumping 10 amps into these 2 batteries and pulling 100 watts or so (barely breaking even) my only concern is that the power isnt exactly "clean" and that the alligator clamps were touching and that the dc to ac inverter was pulling some of the power directly from the wall charger.. the only problem i actually solved is the voltage irregularity, growing up in Montreal, Canada, these issues never crossed my mind as Hydro Quebec always provided safe and clean electricity.. in fact i believe hydro Quebec even provided power to the New York City powergrid, either powering half or a good portion of NYC , the more you know

 

Not racist at all, I've lived off and on in the Philippines since the 70's. For my last house there I built a 'technical' separately derived power grid of an isolation transformer (ISOREG) to break the nasty utility grounding (or the lack of) and connected my own grounding rod to the secondary side of the ISOREG, then to a UPS for sensitive appliance power. This was totally isolated from the utility power.

Things with motors (AC/REF, etc ...) were still on the utility side but used those cheap switched/tapped autotransformer voltage regulator boxes to try and keep them running when the brownouts happened every afternoon.

very awesome big guy, may i ask which island ? i live 20 km from an abandoned ww2 US naval yard that is in San Pedro Bay, Leyte, granted i get everything via mail from the main island Luzon, but that really isnt an issue for me

small question, what if i ramped up my solar power pull ? i barelty get 250 watts now, what if i started pulling 1500 watts ? and i plugged in a PFC puresine wave UPS to that power... ( yes eventually AC too) whould any of that power be harmful to my gaming laptop and/or fridge ?

apperantly i can buy a solar panel (with a guarantee) that can provide up to 550 watts for only 5000 php (or 100$USD)
3 of those and im laughing each time i receive the electricity bill

 

very awesome big guy, may i ask which island ? i live 20 km from an abandoned ww2 US naval yard that is in San Pedro Bay, Leyte, granted i get everything via mail from the main island Luzon, but that really isnt an issue for me

small question, what if i ramped up my solar power pull ? i barelty get 250 watts now, what if i started pulling 1500 watts ? and i plugged in a PFC puresine wave UPS to that power... ( yes eventually AC too) whould any of that power be harmful to my gaming laptop and/or fridge ?

apperantly i can buy a solar panel (with a guarantee) that can provide up to 550 watts for only 5000 php (or 100$USD)
3 of those and im laughing each time i receive the electricity bill

I was at Subic, Angeles, Cebu, Bohol, Zamboanga and Quezon City near Diliman. I was married (wife was a student at UP) at Camp Crame.
https://en.wikipedia.org/wiki/Camp_Crame

Take the solar panel guarantee (maybe 550wh PER DAY) with a big grain of salt. Solar off-grid is a good option for stable power but it won't be cheap for something reliable in the 1500 watt range as the expected loading.

 

Is there a way to connect my 2x 12v batteries to the laptop ??? technically the laptop operates on DC or am i wrong ? and if it draws 180 watts ill just plug the smart charger to the 2 batteries and always keep them moderately full, i mean i have a dc to ac inverter but converting power like that back and forth has to have a huge loss in efficiency.... my little brain only knows 1 thing, you cannot connect SLA batteries to lithium batteries.. and im quite certain the battery built into the laptop is lithium (non-removable)

so, how exactly would i convert 12v into 19v (just assuming, typically laptops only have 19v batteries)

 

I was at Subic, Angeles, Cebu, Bohol, Zamboanga and Quezon City near Diliman. I was married (wife was a student at UP) at Camp Crame.
https://en.wikipedia.org/wiki/Camp_Crame

Take the solar panel guarantee (maybe 550wh PER DAY) with a big grain of salt. Solar off-grid is a good option for stable power but it won't be cheap for something reliable in the 1500 watt range as the expected loading.

wow, youve been at all the fun corners, i was actually in subic bay last year but had to leave due to lack of space.. i stayed up the hill (part of Olangapo) and of course Zambuanga to assist with the MILF thing.. that was i dunno. 10 years ago ???
and once i saw my favourite fast food chain(jolibee) flooded by typhoon Egay, i took off to different provinces
im simply in love with this place.. and also a great bonus i can visit my daughter anytime i like

so when it advertises 550 watts.. seller doesnt mean hourly ??? and according to the spec sheet it is 2 meters by 1 meter.... kinda big...

 

wow, youve been at all the fun corners, i was actually in subic bay last year but had to leave due to lack of space.. i stayed up the hill (part of Olangapo) and of course Zambuanga to assist with the MILF thing.. that was i dunno. 10 years ago ???
and once i saw my favourite fast food chain(jolibee) flooded by typhoon Egay, i took off to different provinces
im simply in love with this place.. and also a great bonus i can visit my daughter anytime i like

so when it advertises 550 watts.. seller doesnt mean hourly ??? and according to the spec sheet it is 2 meters by 1 meter.... kinda big...

I've been around, at sea and where working on the bases there.


Show us the ad. Your $100 price for a real 550W panel would be a great deal here.

 

will do...

I've been around, at sea and where working on the bases there.
View attachment 335214

Show us the ad. Your $100 price for a real 550W panel would be a great deal here.

will do.. its somewhere on my fb, please dont hold your breath, i go to facebook as often as i go to a gynacologist and im male....

 

im sorry, i guess i wasnt clear with my question, between the 2 batteries and this hefty UPS.. can i use a simple 1000 watt dc to ac inverter even if it is only modified sine ??? since the rear of the ups has 8 outlets in the rear.. i was thinking just 1 cable to the dc to ac inverter and use this ups to connect everything ( except AC since the surge is usually 1000 watts and the rest is just a big fan.. which evens out to 550 watt rating ) im simply asking if i can feed the ups a modified sine wave and receive pure sine wave from the rear of the ups ???? terribly sorry if this is a "blonde" question to ask but how else can i learn ?

 

If you want to run off the batteries, put them in series, to get 24V then use a buck converter to get the to 19V. How many Amps does the power brick supply? You need to know that to pick a buck converter.

 

im sorry, i guess i wasnt clear with my question, between the 2 batteries and this hefty UPS.. can i use a simple 1000 watt dc to ac inverter even if it is only modified sine ??? since the rear of the ups has 8 outlets in the rear.. i was thinking just 1 cable to the dc to ac inverter and use this ups to connect everything ( except AC since the surge is usually 1000 watts and the rest is just a big fan.. which evens out to 550 watt rating ) im simply asking if i can feed the ups a modified sine wave and receive pure sine wave from the rear of the ups ???? terribly sorry if this is a "blonde" question to ask but how else can i learn ?

It depends on the UPS. If its a 'real' online "double Conversion" UPS, where the utility power only charges batteries, the UPS always runs on batteries and doesn't 'switch' (with a manual override for emergency operation without the internal inverter) quickly to utility power when it senses a utility fault.

Then maybe (the online UPS runs OK with modified sine wave input power).

It's unlikely you will ever save money on electrical energy with Solar panels but you might gain reliability for those critical loads.