Please Help ! Connection 12v Inverter to 24v system ?
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One idea that I was reading somewhere was to use a MPPT charge controller ? Can MPPT controller charge 12v batteries in parallel with 24v panel ?
So, if I buy a MPPT 24v, 20 amp charge controller and then connect my batteries in parallel (to make it 12v) and then connect inverter to batteries...
Does that appear to be a quick workaround ?
-Paralleling several batteries to increase capacity doesn't work that well; expect a more rapid end of life of the batteries if you do that.
-Technically you need a 12V (system voltage) MPPT, not a 24 volt.
The Tristar 30 would work for you (12 volt out, up to 150 volt in, 30 amps) and runs around $350.Comment
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Get rid of the PWM controller and buy a quality MPPT controller. If you insist on using 12 volt Inverter. (bad idea), Get a MPPT controller and reconfigure your batteries for 12 volts. At 500 panel watts on 12 volts requires a 40 amp MPPT controller.MSEE, PEComment
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It'll unbalance the batteries. One battery will remain at full charge voltage 12.8 while the other will drop. Let's say you drop it down to 12.4V. Now your string voltage is 25.2V. The charge controller sees that it needs charged. It (the charging process) assumes both batteries are of the same voltage. That would be 12.6 V. so it's trying to overcharge one battery while the discharged will never achieve full charge. The more you use the system the worse the imbalance becomes.
You really have only 2 options.
1. Get a 24V inverter
2. Get an MPPT charge controller and reconfigure into a 12V battery bank.
WWW
what to do now? how to solve it?Comment
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i have forget my system and discharged one battery badly and this happen one battery at 13vdc other 14vdc i tried to dishcrge the higher voltage one but no use as soon as connect batteries to charge controoler one goes high and oother stay same as it was. what to do now? how to solve it?
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not that bad man ... i have done this mistake many times and get away with it the main problem is that i own a 24vdc system and from time to time used to get 12vdc inverter to operate on one of the batteries
while one get dischraged i quickly try to discharge the other and eventually get the balance again
however this time i forget the system after i used it and went on in trip for 2 days
the pwm start charging one at 14 and other at 12.9 or so
still i am struggling getting them in balance i am connecting them in parallael as some one indicates should be restored with 3 days of paralled operation
remember on note they are agm for if not agm they wont withstand harsh charging ,,,,,if they were gel i would have tossed them away far before i make this postComment
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not that bad man ... i have done this mistake many times and get away with it the main problem is that i own a 24vdc system and from time to time used to get 12vdc inverter to operate on one of the batteries
while one get dischraged i quickly try to discharge the other and eventually get the balance again
however this time i forget the system after i used it and went on in trip for 2 days
the pwm start charging one at 14 and other at 12.9 or so
still i am struggling getting them in balance i am connecting them in parallael as some one indicates should be restored with 3 days of paralled operation
remember on note they are agm for if not agm they wont withstand harsh charging ,,,,,if they were gel i would have tossed them away far before i make this postComment
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with out the help of the insulters!Last edited by gendil; 08-10-2018, 01:02 PM.Comment
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not that bad man ... i have done this mistake many times and get away with it the main problem is that i own a 24vdc system and from time to time used to get 12vdc inverter to operate on one of the batteries. while one get dischraged i quickly try to discharge the other and eventually get the balance again. however this time i forget the system after i used it and went on in trip for 2 days.
If you want to try, charge both batteries SEPARATELY. That's SEPARATELY. Don't parallel them, don't try to rebalance them while in series. Use the manufacturer's recommendations for absorb voltage, then float them for a day. Then discharge them and measure the discharge to some point (say 2.05 volts per cell.) If they both give you about the same amp-hours, then great. Charge them again and reconnect them.
If they give wildly different amp-hour numbers, or one has a much lower discharge voltage or a much higher internal resistance, then you'll need new batteries.
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i have forget my system and discharged one battery badly and this happen one battery at 13vdc other 14vdc i tried to dishcrge the higher voltage one but no use as soon as connect batteries to charge controoler one goes high and oother stay same as it was
what to do now? how to solve it?
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My apologies. I am having a bad day and while I wanted to get your attention I should have not insulted you..Comment
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never mind man i really have to pay for my forgetfulness i just forgot to charge them to flaot both i slept and sun take over pwm charged one more than the other and for my
worest luck i was escorted by 2 of my friends
to trip at the very morning that ii have no chance to fix the situation
they service me for 3 years or more and i have done this and get a way with it by discharging the one with extra voltaage and charge the low on to its flaot and leave it there at flaot
for day or 2 then reconnect them they catch each other
i will try use what you say guys and back to you with answers
thanks allComment
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Comment
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never mind man i really have to pay for my forgetfulness i just forgot to charge them to flaot both i slept and sun take over pwm charged one more than the other and for my
worest luck i was escorted by 2 of my friends
to trip at the very morning that ii have no chance to fix the situation
they service me for 3 years or more and i have done this and get a way with it by discharging the one with extra voltaage and charge the low on to its flaot and leave it there at flaot
for day or 2 then reconnect them they catch each other
i will try use what you say guys and back to you with answers
thanks all
You have a few choices now that you need new batteries.
cheapest is to set the entire system up 12V. assuming you have sufficient wire capacity...OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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How do i post my own question? I have 2 60v 240 w panels and a 30a mppt controller and 2 12v deep cycle batteries. Is that going to work?? Can i charge 12v batteries with 60v panels? Mppt charger 30aComment
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