24v and 12v charger

Wow, 24 V is not common but nearly 2 grand is surely overkill.

I assume it's 2x 12 V batteries internally. So you could buy two cheap 12 V chargers and put them in series. R 150 each.

Or put the AC input on some sort of UPS.
 
Tomtomtom said:
Wow, 24 V is not common but nearly 2 grand is surely overkill.

I assume it's 2x 12 V batteries internally. So you could buy two cheap 12 V chargers and put them in series. R 150 each.

Or put the AC input on some sort of UPS.
Click to expand...
There are plenty cheap 24V chargers.

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Tomtomtom said:
Wow, 24 V is not common but nearly 2 grand is surely overkill.

I assume it's 2x 12 V batteries internally. So you could buy two cheap 12 V chargers and put them in series. R 150 each.

Or put the AC input on some sort of UPS.
Click to expand...
Holy Moly 2 chargers in series?
Have you actually done this before?
 
TheChamp said:
There are plenty cheap 24V chargers.

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Click to expand...

That's not R 150 cheap.

All that's needed for these gate/door/alarm battery float chargers is to be able to deliver a bit more current.

You can build one yourself with a buck-boost module fed by a spare phone charger.
 
Tomtomtom said:
Wow, 24 V is not common but nearly 2 grand is surely overkill.

I assume it's 2x 12 V batteries internally. So you could buy two cheap 12 V chargers and put them in series. R 150 each.

Or put the AC input on some sort of UPS.
Click to expand...
noooo , they will wrestle to the death .
 
Tomtomtom said:
That's not R 150 cheap.

All that's needed for these gate/door/alarm battery float chargers is to be able to deliver a bit more current.

You can build one yourself with a buck-boost module fed by a spare phone charger.
Click to expand...
not enough current .
 
jezzad said:
My battery in my garage motor is 24v and isn’t being charged quick enough during load shedding.

Could I use something like this to manually charge it - https://leroymerlin.co.za/bosch-aut...81&sfdr_hash=e52a4bd15db18c3589575b9c3a343207

and then would this also be able to charge the regular 12v 7ah Gate motor batteries?
Click to expand...
you need a constant voltage constant current charger but .....the inboard charger will probably fry .if you can disconnect the inboard unit it will work ,but current still will only be around 1.2 amp max for charging with a float of around 0.8 amp at 29 volt or so .not a pulse charger either unless its just to recharge quickly then back to float unit
 
soulie said:
.....the inboard charger will probably fry
Click to expand...

Unlikely, all chargers are designed to handle low-impedance loads and wide voltage ranges.

In any case who cares, the built in charger is not fit for purpose anyway.
 
Tomtomtom said:
Sure, explain that.



5-10 W is plenty. It'll be night and day vs. the built in 1-2 W trickle.
Click to expand...
make sure you give your details to the author so he can contact you to replace what cooks ,seeing as you now have given advice ,how do you work out 1 to 2 watts on a built in charger ?at 24 volt .
 
jezzad said:
Soooooo will it work or not?
Click to expand...

I wouldn't. It's overkill and it's "smart" so it's going to be unpredictable.

Reviews say it does a 16 V "recovery" stage (for 12 V, so presumably 32 V for you) . That won't be good left inline with load.

It also might push too much current for these smaller batteries.

But it does say "Use the C7 as a power supply for accessories like a cooler box (12V batteries above 14Ah) " so who knows.

You don't really need anything over 1 A / 25 W or so.
 
jezzad said:
Could I use something like this to manually charge it - https://leroymerlin.co.za/bosch-aut...81&sfdr_hash=e52a4bd15db18c3589575b9c3a343207
Click to expand...

This one costs R768 and you get free delivery:

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Tomtomtom said:
I wouldn't. It's overkill and it's "smart" so it's going to be unpredictable.

Reviews say it does a 16 V "recovery" stage (for 12 V, so presumably 32 V for you) . That won't be good left inline with load.

It also might push too much current for these smaller batteries.

But it does say "Use the C7 as a power supply for accessories like a cooler box (12V batteries above 14Ah) " so who knows.

You don't really need anything over 1 A / 25 W or so.
Click to expand...
i hear you and follow your thought ,but a 1amp supply at 5v pushed up to 24v isnt going to give much current at the end .if a 45 watt charger at 5v pushed up to 24 volt may work for a while but not for long .
 
soulie said:
make sure you give your details to the author so he can contact you to replace what cooks ,seeing as you now have given advice ,how do you work out 1 to 2 watts on a built in charger ?at 24 volt .
Click to expand...

Two CC-CV circuits in series is fine, actually good for balancing. Obviously don't have the grounds tied, they need to be isolated.

It may be 2-4 W, I don't know, clearly it's not enough. I know my gate motor "charges" at about 100 mA.

soulie said:
i hear you and follow your thought ,but a 1amp supply at 5v pushed up to 24v isnt going to give much current at the end .if a 45 watt charger at 5v pushed up to 24 volt may work for a while but not for long .
Click to expand...

You only have to replace the energy lost during use. A 500 W motor running for 20 sec uses 2.8 Wh.

So 5 W will replace that lost energy in about 2 hours. under an hour.

I agree 10-25 W would better. Planning on hooking a small solar panel up to mine...
 
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Tomtomtom said:
Two CC-CV circuits in series is fine, actually good for balancing. Obviously don't have the grounds tied, they need to be isolated.

It may be 2-4 W, I don't know, clearly it's not enough. I know my gate motor "charges" at about 100 mA.



You only have to replace the energy lost during use. A 500 W motor running for 20 sec uses 2.8 Wh.

So 5 W will replace that lost energy in about 2 hours.

I agree 10-25 W would better. Planning on hooking a small solar panel up to mine...
Click to expand...
100ma will be your float current ,you need around 800ma to charge ,some can go up to 1.2 amp but will dry out quickly ,on a solar charger you will need at least a good quality 20 watt unit to give what you want .you do get the units with a built in trickle at around R299 .they can charge at around 1amp under good sunlight .
 
D said:
This one costs R768 and you get free delivery:

Takealot.com: Online Shopping | SA's leading online store

South Africa's leading online store. Fast, reliable delivery to your door. Many ways to pay. Shop anything you can imagine: TVs, laptops, cellphones, kitchen appliances, toys, books, beauty & more. Shop the mobile app anytime, anywhere.
www.takealot.com www.takealot.com
Click to expand...
i would rather pay for delivery and get the charger freeeee.
 
soulie said:
noooo , they will wrestle to the death .
Click to expand...
My father in laws inverter has to low charge rate to fill up his batteries in stage 6

ie he would be fine for te first 4 hours but the next not so much as it could not replenish fast enough (he's batteries is kak but doesn't want to fork out the cash for lithium )

Luckily he already had a 12/24 capable car charger

Hooked it up and he has been happier than a pig in palestine ever since, between the inverter and his car charger he gets them topped up quick enough
 
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