![]() ![]() Alternators are not good at 3 stage charging and loose efficiency as a battery gets close to full so think of it as a bulk charger only let the solar do absorb and float. ![]() Recommended RPM is usually in your specs. They can turn a little slower but you need the rpms to turn the fan fast enough to keep it cool. The older 2 wire units are good as well you can adjust charge amps with a resistor. ![]() Also you must turn a one wire fairly fast to get it to self energize. That kind of sustained amperage on an alternator is hard so they usually recommend a heavy duty or marine unit. ![]() At 40 amps I was charging a 400 amp hour battery bank so that is a c10 rate, which is ideal. Some cautions: alternators are made to charge a small battery fast then slow down not always the best for deep cycle. I upgraded to a magnum inverter with a charger so didn't need it any more. I only ran it 4 times and have removed it and stored the parts as I needed the engine for a snowblower. if you are going to build a alternator based generator get one geared from the work go for 24 volts. I also charge the laptop and up to 5 powertool batteries at the same time that I'm topping off the 24v battery bank.Īlternators provide wild 3 phase ac the regulator does the rectifying and voltage control. I can use it to run the tablesaw or compressor instead of firing up the huge shop generator. I ended up deciding an AC generator, while less efficient for batt charging, was sufficiently more flexible to be preferable. Note how hands-on the charging process is. This instructable has an interesting take on the matter. mastervolt?) These are marine products, generally, so there is probably some sticker shock involved.Ģ alternators in series does not seem like any sort of good idea. There are 3-stage regulators meant to do this much better. The remaining drawback is that your average 24v regulator is not going to do a great job charging deep cycle batteries. With the regulator swap, for clarity, it is not that you would be generating 12v at the alternator and then running it through the 24v regulator to step it up replacing the 12v regulator (assuming it was there.) with the 24v regulator means the alternator will be putting out 24v. I haven't done this, but read up a bit, a while back.Ī 24v alternator or a heavy duty 12v with 24v regulator should both work alright, the trick is not burning them up with excessive speed. Could it be as simple as swapping the alternators out or am I missing something?Īny thoughts? Pro's/con's of 24v generator build? Anyone tried this? I can't find any info on doing this but I can't see where it'd be an issue? I'd only need half the amperage rating as compared to a 12v alternator, so I wouldn't need a heavy-duty one, if I'm not mistaken. That's twice the alternator expense though, and complicates the generator build.ģ. Wire x2 12v alternators in series to produce 24v power. Use a 12v alternator, run the power through a regulator that bumps it up t o 24v, which the alternator should be able to supply- BUT this will likely burn up the alternator / shorted its lifeĢ. My options, so far, appear to be the following:ġ. I haven't been able to find much literature on 24v generators. We are actually about to build 2 generators (using 200cc motors) ourselves, and I thought, well, why not make one a 24v generator? I found some info on building a large transformer yourself but I don't want to do that. I can't find any sources for high amperage (over 10amps, at least) step-up transformers, so I tossed out that idea. The major kink with going to a 24v system seems to be charging the batteries with a generator when the sun's been gone too long. Our panel setup is 810watts / 24v (really 45v of course). We have multiple MPPT charge controllers that are variable 12/24v and have 6v and 12v accessory ports. So I figure we can meet that need by either using a low-amperage step-down transformer to supply 12v power from the 24v bank, or run a line from the charge controller's accessory port to a switch or series of switches that will supply 12v power to these light strips. We have only 1 need for direct 12v power a few 12v lighting strips. So we're thinking of upping the 12v system to a 24v system. ![]()
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