over charger batteries???? 12v now is over 17v??????:(

[luisito]

hi i have problem?
i overcharge my bank of bateries 20 bateries
my charger controller it was defected!!
i got really over charge
my 12v bateries got over 17!!!
so i was thinking to buy POWERINVERTER FOR 24V
MY POWER INVERTER IS FOR 12V
any idea how to discharger my batries ??
thanks

[Sunking]

Well if you have a 24 volt inverter it requires a 24 volt battery to operate it.

[russ]

Hi Luisito - Welcome to Solar Panel Talk!

If you have a 12 volt system all equipment would be 12 volt.

What you need is a 12 volt charger that functions correctly. If a 24 volt charger failed it would do about the same thing.

Russ

[luisito]

my invereter is for 12v

Well if you have a 24 volt inverter it requires a 24 volt battery to operate it.

i will have to buy one? no?

[Bala]

As you said your charge controller is not working so your batteries are over charged.
The batteries will discharge in due course.

You need to solve the problem that caused your batteries to over charge, then test your batteries to make sure not are damaged.

You cant and dont need to put a 24v inverter into a 12volt system.

If the system has been working fine with 12v components it will again once you solve the overcharging problem

[Sunking]

12V
any idea how to discharger my batries ??

Just disconnect them from the Charge Controller and they will drop immediately down to 13 volts.

However if you left the batteries connected to the defective charger for too long, I bet you will find your batteries will drop vell below 12 volts, meaning they are destroyed. So not only will you need a new charge controller, but all new batteries.

Why in the world are you using 20 12 volt batteries for? That alone will destroy them.

[john p]

what ahr are /were the 20 batteries..?/ What type of battery??
If lead acid batteries you must have some bad imbalance between them?? it almost impossible to equalize 20 parallel batteries,!!!.. what size solar panel array?? in watts. and what size inverter you using ?? and the loads on the inverter??

[luisito]

20 bateries

i conected negative to negative positive to positive
my bateries link
( http://www.slesolar.com/items/item2132.htm )
S12V300

i just bought a 12v light and i coneceted to the baterie one by one
i make then drope to 12 v
and i hope they are not dead i pay lots money for this bateries...

and im looking to buy this charger controller >
40 Amp, 12 volt Diversion Controller
40 Amp, 12 Volts. Wind/Solar Diversion-Charge Load Controller.

fron this company:http://www.colemanair.us/vp_asp/scri...s%2FRegulators

or give me NAME of a charger controller wind and solar
thank you so much!
to everyone

[Sunking]

Those batteries you have are completely inappropriate for Renewable energy applications, and you configuration of using 20 in parallel is insane just asking to be killed.

What you have is batteries designed for UPS systems emergency Stand By Power. They are not made for cycle service. . At best they have maybe 100 to 200 cycles in them or less than 1 year service in a cycle RE service.

When you replace them by batteries for cycle service and sized so you only need 1 string.

I also agree with John it would be almost impossible to get a 12 volt battery up to 17 volts. Only way to do that is they are open circuited (destroyed). Take one out and measure the voltage after it has rested for a few hours. Bet it will be less than 12.6 volts. If so you now have an expensive boat anchor.

[john p]

Luisito. it very hard to offer you a controler without knowing the following..
you using a solar panel array??? if yes what is total wattage??
you using a wind generator?? if yes its rated output,?
Do you have th e AMPHOUR rating of each of those batteries??
What size inverter you using??
What loads are you using on the inverter??

With regards to to batteries as you may have 20 of them a 40a charger is only ever going to put 2a into each one... enough to replace self loss in the battery.. with very little available to power an inverter..

[Sunking]

John it looks like he is using 20 of GNB S12V300. which is a 300 AH 12 volt battery made for UPS systems. He claims 20 of them for a 12 volt @ 6000 AH. There is no panel wattage he can run to support that much battery, at least not with any single charge controller.

It would take at least a 6000 watt solar panel array using 6 80 amp amp MPPT charge controllers to support that much battery at 12 volts, and no one who knows anything about RE battery application would use this battery, or use that much battery at 12 volts. It screams for 48 and 96 volt battery configuration.

[russ]

Quite possibly he has received bad advice from someone - maybe the fellow selling batteries.

Luisito - if you can supply information requested the guys are willing to give you a hand so as not to have a second disaster.

[john p]

Sunking I agree with you 1001% That is why I have asked him the questions I have.. Each question is as important as the other, .You will notice he was asking about a "diversion load charger" That may indicate wind generator.???? I did note if he had a 40a charger at best it will just support battery self losses only.
We as yet have no idea as to what his loads are on the unknown inverter.

[john p]

The hardest thing to get any understanding on now is his claim he overcharged the batteries.. ???
The word IMPOSSIBLE come quickly to mind if he was using ANY single charge controller.

[Sunking]

The hardest thing to get any understanding on now is his claim he overcharged the batteries.. ???
The word IMPOSSIBLE come quickly to mind

Yep Astronomically Impossible came to my mind, unless every one of the batteries is open circuited, then i could understand it. I got a sneaky suspicion this guy got conned into buying a load of used batteries from a data center that were in a UPS. Quite common for telecom companies to look for a pigeon to pluck to sell there used batteries too because it cost them a lot of money and EPA paperwork to dispose of them.