I have two big-a$$ boat 12V batteries that were installed in my basement as a backup power source for a pump. I since fixed the source of the original water breach and have no need for the pump or the backup system.
So, I had an idea to use two good quality 4 channel car amplifiers for my active 3 way speakers and run them from two separate 12V, 100W switching PS, with the boat batteries providing the extra amps if/when needed. The question is, is it safe to paralell the batteries with the switchers? If not, is there a circuit that would make the connection a sound one?
So, I had an idea to use two good quality 4 channel car amplifiers for my active 3 way speakers and run them from two separate 12V, 100W switching PS, with the boat batteries providing the extra amps if/when needed. The question is, is it safe to paralell the batteries with the switchers? If not, is there a circuit that would make the connection a sound one?
I don't think that I would parallel them. Ultimately one battery will be discharging into the other battery. Keep the amps and the batteries seperated and by a "two bank" charger for them.
http://www.batterystuff.com/battery-chargers/12-volt/multi-bank/GU2607A.html
http://www.batterystuff.com/battery-chargers/12-volt/multi-bank/GU2607A.html
12V 100W SMPS ?
Hi Thunau
If batteries is of same type, status and brand you could easily parallel them for 12V double capacity.
But, parallel battery with SMPS, is not easy because of this:
Battery need at least 14-14,4 V when charging. When battery is full charged (by a suited battery-charger) the battery voltage will be approx. 13-13.2 V (=2.2V/cell). If connect battery to SMPS current could flow IN TO the SMPS and make some damage though the SMPS only have 12V outputs.
If you connect battery to SMPS when battery is <13.2V, say 12V, well your battery will newer be charged by the SMPS because it need at least 13.2 V to keep it maintenance charged.
Maybe you could trim outputs on SMPS to reach 13.2-13.8V then it could be an option. But the SMPS has no control on charging status for battery. Battery could be over charged if SMPS outputs reaches more than 13.8V. Also dont forget those batteries are not sealed (I guess) and can explode if a spark is made at one of the poles (thats why good chargers start a delayed charging, only AFTER battery had been safely connected to it) Those batteries do have oxygen and hydrogen inside the shell (= explosion risk to count on).
My suggestion is that you drive the amps only by your batteries OR only with your SMPS connected to a large capacitor bank for your purpose. Dont use your charger when you play your amps or else they could pic up high switching frequencies (only guessing) and burn your amps or loudspeakers though most modern chargers of today is built like a SMPS without the DC-filtering (=output normally consist only of pulsed DC at high frequency).
Just my thoughts
Regards
Hi Thunau
If batteries is of same type, status and brand you could easily parallel them for 12V double capacity.
But, parallel battery with SMPS, is not easy because of this:
Battery need at least 14-14,4 V when charging. When battery is full charged (by a suited battery-charger) the battery voltage will be approx. 13-13.2 V (=2.2V/cell). If connect battery to SMPS current could flow IN TO the SMPS and make some damage though the SMPS only have 12V outputs.
If you connect battery to SMPS when battery is <13.2V, say 12V, well your battery will newer be charged by the SMPS because it need at least 13.2 V to keep it maintenance charged.
Maybe you could trim outputs on SMPS to reach 13.2-13.8V then it could be an option. But the SMPS has no control on charging status for battery. Battery could be over charged if SMPS outputs reaches more than 13.8V. Also dont forget those batteries are not sealed (I guess) and can explode if a spark is made at one of the poles (thats why good chargers start a delayed charging, only AFTER battery had been safely connected to it) Those batteries do have oxygen and hydrogen inside the shell (= explosion risk to count on).
My suggestion is that you drive the amps only by your batteries OR only with your SMPS connected to a large capacitor bank for your purpose. Dont use your charger when you play your amps or else they could pic up high switching frequencies (only guessing) and burn your amps or loudspeakers though most modern chargers of today is built like a SMPS without the DC-filtering (=output normally consist only of pulsed DC at high frequency).
Just my thoughts
Regards
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