| Author | Message | ||
| captain ron (Captain_ron)
Rating: N/A |
I just got an offer I can't refuse and needed badly. I'm getting 8 Dynasty 12-275 AGM batteries to drive my 5000 watt inverter. I should get a week of usage between charges according to some calculations JJ made. But I'm going to put in a 12 volt alternater to keep them charged at all times. between that and my vector smart charger I should get a lot of life out of them and may not need to run my generator except for running my A/C. I know you guys with all them electrical brains are probably gonna rain on my parade. | ||
| John that newguy Rating: N/A |
Won't work; don't do it; it causes cancer in female pregnant rats. Hey... why not just use a 12v charger off the 110v inverter that's running off your 24v system? It would charge the batts whilst connected to shoreline as well. | ||
| James Maxwell (Jmaxwell)
Rating: N/A |
600ah @ 12v. If u get a week of usage btwn. charges, you don't use much power and probby could get by a lot cheaper w/ a flashlight. Don't be misled by the 275 part of the nomenclature #, I believe they are 75 ah ea. if the last thread on these is correct. Are they new or take-outs? If they are take-outs, beware. If new, and u like the price, go for them. Limit charging to 14.2 bulk and float them at 13.3-13.4. Never equalize, period. They tend to go boom in the night if u equalize them. You will like the no maintenance part. | ||
| captain ron (Captain_ron)
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the inverter is not being run off 24 volt, 12 volt | ||
| cd Rating: N/A |
(((" I'm getting 8 Dynasty 12-275 AGM batteries to drive my 5000 watt inverter "))) is that 275AH at 12v? 8 x 275 = 2200amps @ 12v or is it 275AH at 24v? 4 x 275 = 1100amps @ 24v (((" But I'm going to put in a 12 volt alternater to keep them charged at all times "))) when the engine is Running, ok, how when the bus is parked? I think the vector smart charger would do it parked, the alternator when the bus engine is running. (((" may not need to run my generator except for running my A/C "))) In the park, plugged in, you won't need the generator. When not plugged in, only if the engine is running when the Alternator is charging. "Did you check you 12v alternator amps vs inverter/air con amps? I think you will find you are gonna run short if you try to run more than one air con." (((" may not need to run my generator except for running my A/C "))) Not at all, just a gentle "nudge" in a better direction. cd | ||
| captain ron (Captain_ron)
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http://www.dynastybattery.com/cd_dyn/products/batteries/ups/pdf/12-270.pdf You tell me. I don't understand all the mumbo jumbo. | ||
| captain ron (Captain_ron)
Rating: N/A |
I don't plan on using A/c on inverter. And since I travel alone I would only need 1 A/C at a time. I may try to run one off my inverter but I can use a fan while driving. My amp useage is minimal for now. my fridge only uses 3 amps which will be the only thing running continuously. Whats a bulb or two use 1/2 amp? If I get a descent booking agent I'll be driving so much I won't have much time to use much electric. | ||
| Lin Rating: N/A |
The batteries in the link above are the same ones I just installed. They are 270 WPC (watts per cell) but only 75 amp hours. With 8 batteries, I would think that is still quite a bit of power. | ||
| Sean Welsh (Sean)
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Umm, Ron -- your math doesn't work, at least not to "a week of usage." Eight of these batteries is 600 amp-hours at 12 volts. To get any kind of decent life out of the batteries, you should not routinely discharge them beyond about 50%, which gives you 300 amp-hours of usable capacity (at the "20-hour rate"). You said your fridge draws 3 amps, but that's at 120 volts. That translates to 33 amps at 12 volts (including the ~10% inverter penalty). 33 amps drawing out of a 300 amp-hour bank means you can only run your fridge for less than ten hours. Now, realistically, the fridge only draws 3 amps when the compressor is running, and that's not all the time. But even if it is only 20% of the time (and that would be a *very* efficient fridge, and you could never open the door), that's still only about two days of run time. More likely, it will be 40% or more of the time, meaning barely one day. You will have to charge your batteries every day just to keep your fridge running. A 160-amp alternator will take roughly four hours to replace the 300 amp-hours into the bank, so if you drive four hours each day, that would do it. I don't know what the vector charger puts out in terms of current, but if it could put out the same 160 amps, it, too, would take about four hours to do the job. FWIW. -Sean | ||
| Sean Welsh (Sean)
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Sorry -- just re-read the specs on these. Maximum allowable charge current is 15amps per unit, or a max of 120 amps for your bank. So figure five hours to recharge from 50% DOD. Also, make sure your charger is set at max current of 120 amps. -Sean | ||
| CoryDaneRTS Rating: N/A |
The florescent, 60w light output use 15watts of power, 12vdc. that is roughly 1 amp. If you are using the old incandescent bulbs, the cost in power will be higher. cd | ||
| CoryDaneRTS Rating: N/A |
Its been awhile since I ran the alternator vs batt ideas in my head but lets see... I use the rough figure of 15amps per AC so if alt = 200 AMPS at 12vdc 200amp @ 12vdc alt translates to 20amps @ 120ac thats ONE Air Con with little for other things, you will have to shut down the AC to run the microwave. Thats barely enough for startup currents for the AC to start. So, you will be able to feed the inverter for a while on the battery but as you can see, if you run more than one ac on inverter with out plugging in for charging the batts, the battery will be losing power over the long run and you will need to charge after use. cd | ||
| captain ron (Captain_ron)
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Sean, you seem wise beyond your years  Nobody told me about having to multiply the amps from 110 to 12 volt. I ran my fridge about 24 hours on the 2 batteries I have now before the inverter alarm started going off. they are just 12 v deep cycle marine batteries. I'm gonna use these batteries I'm getting as long as I can as they are costing me nothing. so that should give me plenty of time to study this battery thing and save for the best posible set up. I'm glad I have JJ here so close helping me or I wouldn't have any electric at all. every time I think I've caught on or learned something about electric somebody says somthing different to blow that out of the water. so I'll stick to the carpentry and mechanical stuff and leave the driving to Gray Hound | ||
| Jim (Jim_in_california)
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Ron, if I understand your needs for the bus in the first place, you do a fair amount of driving...so charging it off of the "waste electrical" from the alternator seems a useful enough concept. | ||
| DrDave Rating: N/A |
Uh.. Don't forget. Most Inverters shut down at 10.5 volts automatically to save batteries. If you combine the inverter on the batteries with the house lights (12 volt) the inverter will quit long before the lights go out. There is a LV shutdown available that can be installed to shut off the 12 volt lines. Personally I would rather be able to see as I stumble towards the generator switch. ( Generators should have a separate battery dedicated ) Us cheapo's don't have them autostart gizmos... | ||
| Jim (Jim_in_california)
Rating: N/A |
Esp. if you got 'em free, this isn't all that bad a battery bank. It's about equal to two deep-cycle 8Ds, right? Lotta people live on that. |