can I recharge my RV battery by driving ? (by alternator)?
142453
All RVs are set up to charge the "house" batteries when driving, but there are a few conditions which may need to be met:\n\n1.  Some have intelligent battery isolators which will charge the chassis (engine starting) battery only, until it's full, then begin transferring power to charge the house batteries.  (Possible failure point is if the chassis battery has low voltage due to age or failure, the intelligent isolator will never give up trying to charge it and ignore the house batteries.)\n\n2.  All RVs have some type of batter isolator, and some of them are prone to failure.  (You probably have a "battery combine" button, which is used to link the two batteries when you need extra power for starting the engine.  That's an override for the isolator.)  Follow the positive lead from the chassis battery to find the isolator.  If it's a silver cylinder about the size of a shot glass, the simplest solenoid-type isolator, it's probably dead as they seem to fail every year or two.  But they're easy and less than $25 to replace.
508767
It sounds to me like you have an Interruptible Power Supply (UPS) where you have a primary AC power supply and a battery backup. It seems from your question that you are looking to automatically switch to the battery backup if the AC fails. Of course you must rectify the DC from the battery to AC of the proper current and voltage. Assuming this is the case, you can wire the load through an AC relay. Connect the AC power source to the relay coil in parallel to the load. Hot on one side, Neutral on the other.  Wire the primary AC hot wire to load  through the Normally Open contacts. Wire the DC rectified AC Hot wire through the Normally Closed contacts. When you have good AC power the relay coil will energize, closing the Normally Open contacts (and opening the Normally Closed contacts). This will energize the load with primary AC power. If you loose primary AC power, the relay will de energize. This will close the Normally Closed  contacts(and open the Normally Open contacts)  and port DC converted AC to the load. \n\nYou will probally have to come to a common point after the relay contacts such that power takes the path of either the AC or DC but goes through to the load via the same path after the relay.\nEnsure that you have compadible neutrals between the AC and the DC they will probally be common. Only the hot wires go throughthe relay. \nChoose a relay that will be able to handle the current and voltage you desire. Ie you need enough power to energize the relay coil and you do not want to melt the contacts by giving them too much current. You can obtain them as mentioned above frpm granger.com there real cheep. Order the relay and base. \nEnsure the load works well with both power sources.
362726
my dear, hope u r big enough to under stand my answer.\nok i appreciate ur idea to conserve all the mechanical energy produced in a car, but the problem is c if the battery can run a car which requires 100w power that means the power delivered by the battery is 100w now that power is exactly sufficient to run the car but if u want to recharge the battery again u need 100w of more power which will increase the load on the same battery which is to be recharged. which is absurd. so my dear it is practically IMPOSSIBLE to manufacture a car of ur kind. hope u got my answer if u dint understand u go through it once again then also if u face problems do not hesitate to write to me ok bye.
294554
Sure! Remove the tire from a driving wheel, block the other from turning. attach a magnet to the wheel/rim so it wont fly off. Wind a few dozen turns of insulated wire around a bolt and fasten it to something that will hold it near the magnet as it passes by. With an a/c voltmeter  attached to each end of the coil as the magnet goes by you will observe a pulse of voltage each time the magnet goes by.\nDON'T OVERDO IT YOU CAN GET HURT.
701647
An idea would be to use a relay circuit to control the operation of the charger. The voltage out of the battery could be divided so as to latch a "normally off" relay to keep the charger off. The resistance of this circuit would be such that it would not excessively drain the battery. Once the relay is unlatched, the charger would come on.\n\nNow the difficult part - the voltage applied to "charge" the battery would have to be in excess of the "high" voltage in your range. A suggestion would be to use a timer to then cycle off the relay.\n\nThere are commercially available products that already perform this function, if I am not mistaken.
956987
I've put together a web site regarding portable generator use and connection for home backup use.  Take a look and email with any questions you may have.\n\nhttp://members.rennlist.org/warren/generator.html
1156803
if you want to charge, but it can also be plugged when not using. most of the rechargeable batteries today use NiCd or NiMH, so it can automatic stop charging and it can charge the battery even it is half empty. not like batteries before that you must discharge it first before charging it.
1078584
There are some solution available at http://www.batteryspace.com/index.asp?PageAction=VIEWCATS&Category=885
945273
reharsing with loaded guns
820704
Good Idea..but probably expensive to hook up the equipment to some sort of generator....gotta keep the place looking clean.\n\ninresponse to answerman....(below)\nIt could be possible to keep a battery bank charged and use an inverter to run a small a/c.\nSort of like a solar setup or windmill.
1185941
the chemical make up of the batteries is different. no they cant be recharged. go to howstuffworks.com to see a better description.
417548
You could, but there would need to be an efficicent and cost-effective way to do it. There are very large Uninterruptible Power Supplies out there that can be there, in-line, that would act like a buffer.\n\nIt is possible to reverse electricity to an electrical utility. In fact, you can 'farm' electricity and make money doing it.  You simply need a power switch, and some compliance switching devices to feed it back. Its been done with the solar power industry for years.
573048
Hi, Big battery of Truck which u are using with Invertor, but, it must be change your charger of UPS bcoz, your charger of UPS cannot charge the big battery.OK\nor\nyou may purchase UPS cum Invertor that will give u 5-8 hrs of back-up.
175430
sure, you get a 12 volt adapter for the laptop and run it off of solar power or a rechargeable 12 volt battery with a plug in - or an inverter for the regular plugin.
531796
You would need multiple alternators plus an inverter to accomplish this.  A common Delco GM alternator puts out 120A at 13.5-14V DC at an engine RMP above 3000.  You would have to put the DC through an RV inverter (for use camping where you hook up a battery bank and get AC out).  Assuming inverter efficiency of 85%, you would need 7475 (or more if e is less than 85%) DC watts.  You would need 5 alternators to power your inverter.  The problem is the inverter is VERY expensive, as in thousands of dollars.  \n\nThe problem with using a car alternator as an AC source is it is THREE PHASE.  I have had people disable the regulator and get high AC voltage out, but it is three phase.  You would have a difficult time clocking multiple auto alternators so the phases all matched, and then you would only have 3 phase voltage (probably less than 220V but 120V) and it wouldn't be regulated.\n\nFor 6500 watts you need a belt driven gen head.  See northern tool link to belt driven 25KW head.  Also look at their inverters for taking DC and making AC (yeah, I know--americans use 120 but I'm sure you could find a supplier to go to 240)\n\nBut dollar for dollar, you would spend more to fool around with DC alternators than just getting a gen head which was rated at the wattage and voltage with self-regulation.  ALSO you must REGULATE the RPM.  SO just hooking it to a car engine isn't going to work without a governor, which car engines don't have unless you preserve the cruise control option and hook up the speed sensor (which may give weird results at high engine RPM such as 3600 for 60HZ or 3000 RPM for 50Hz).  NOTE: my links are for 120VAC at 60Hz.  Europe will have different specs.
75035
Whenever you have AC power, take out the battery and use that AC power. If you leave your battery inside the lapto, it will still get re-charged. Most batteries have a limited number of re-charges or get 'weaker' after having been re-charged X number of times
368255
No , Because inside the battery is acid and this acid makes energy.When the battery is flat the acid is dry so the battery can't make energy.