S Bengi wrote:Is your current system 450AHr times 12V = 5400WHr = 5.4kWHr
If so your future system will be 225AHr times 24V = 5400WHr = 5.4kWHr
S Bengi wrote:
But lets go with your quoted 450AHr times 24v = 10.8kWHr
You are going to need a generator that is outputting 45A * 24V = 1080W (1.5hp)
So the engine should be 1.5hp*2= 3hp
The alternator efficiency is 60% and it would be best if the engine was only at 60% so more like 1.5hp*3=4.5hp
Dillon Nichols wrote:What is the max output of the MPPT controller?
If it's at all likely to receive more power than this, what is the expected behavior when it has excess incoming power; burn up, or self-limit?
The below post mentions getting more than rated power from alternators used as described with an mppt controller; by virtue of the lack of a 24v battery connected, the alternator ends up putting out notably higher voltage. This is likely perfectly fine for the mppt controller, as long as the resulting higher amperage and hence higher wattage don't become excessive... or, if the unit is equipped to handle excess power by limiting output.
Eric Hammond wrote:There is a lot of excessive complication in this thread.
I would just purchase a charger inverter and be done with it. Hook any old generator up to the inverter and it will charge your batteries, plus you have the bonus of being able to use 120 v AC equipment. Also, You do not need any step up/step down voltage converter for any of your 12v dc equipment.
For example, you said you have 12 volt dc lighting. Wire two in series and your done. Connect the positive of one 12 volt light to your switched fused power and the negative of that light, to the positive of the next 12v d/c light. The negative of the second 12v dc light then goes to ground. Voila, you now have a 24 volt light, without buying anything. The two loads must share the voltage equally in a series circuit, so each load only receives 12 volts.
I wired my shop lights this way. 12 volt LED strips that are 15 ft long are like 8 dollars, 24 volt strips that are 15 ft long were 100. 16 dollars and I can make a 30 ft 24 volt strip..... it really is that easy
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