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I have 40 SLA 7.5 amp hour 12 volt batterys. I want to wire them all in parallel to make a 300 amp hour battery pack to use for emergency power in my home for power outages that happen about 3-4 times a year. I already have a 12 volt 600 watt pure sine wave inverter. My primary want is to be able to run my big screen TV and the computer thats plugged into it...that whole load averages about 300 watts. The bank is going to spend most of it's life sitting on the trickle charger.
I could just simply wire them all in parallel with fuses, but I'm afraid one or more of them is going to die eventually and drop to 6 volts or something and tax the others. My thought was 40 small diodes sent to a common bar and then to the trickle charger and then 40 more diodes to another common bar going to the inverter. This way, if one drops its voltage, it won't wreck the others, but instead it just won't have enough voltage/pressure to contribute to the discharge bar. If is sized them just right, could they double as fuses as well? An actual proper BMS is not really an option because the budget is limited.
I also have 10 trickle chargers lying around so I could also break them into banks of 4 on the charging front but still use diodes or maybe switches to put them onto the discharge bar. Conversely , if charging them all as one bank, I have a 13.8, 14 amp radio shack power supply since they won't have to be recharged very quickly.
I'm open to any better ideas. I know it all sounds odd, but the batterys were given to me for basically free and I'm just trying to utilize what I have.
Thanks for reading.
Jake
I have 40 SLA 7.5 amp hour 12 volt batterys. I want to wire them all in parallel to make a 300 amp hour battery pack to use for emergency power in my home for power outages that happen about 3-4 times a year. I already have a 12 volt 600 watt pure sine wave inverter. My primary want is to be able to run my big screen TV and the computer thats plugged into it...that whole load averages about 300 watts. The bank is going to spend most of it's life sitting on the trickle charger.
I could just simply wire them all in parallel with fuses, but I'm afraid one or more of them is going to die eventually and drop to 6 volts or something and tax the others. My thought was 40 small diodes sent to a common bar and then to the trickle charger and then 40 more diodes to another common bar going to the inverter. This way, if one drops its voltage, it won't wreck the others, but instead it just won't have enough voltage/pressure to contribute to the discharge bar. If is sized them just right, could they double as fuses as well? An actual proper BMS is not really an option because the budget is limited.
I also have 10 trickle chargers lying around so I could also break them into banks of 4 on the charging front but still use diodes or maybe switches to put them onto the discharge bar. Conversely , if charging them all as one bank, I have a 13.8, 14 amp radio shack power supply since they won't have to be recharged very quickly.
I'm open to any better ideas. I know it all sounds odd, but the batterys were given to me for basically free and I'm just trying to utilize what I have.
Thanks for reading.
Jake