I have yet to try paralleling the 600 watt DC to DC boosters. They do have a current limiting potentiometer on the output. Three of them driven at 12.00 volts boosted to say 16.0 volts can pass more amperage than any but the largest size Megawatts can manufacture.
But I TRUST nothing especially my E=MC2 calculations.
So a watt meter is connected inline to the AC power input and when wattage approaches the capacity of the Megawatt, that's it....if it's 9 amps short of the goal, too bad the load is fixed there. This is what I do with the huge LED arrays, fans, and Meanwell power supplies. 350 watts incoming is it. And even then I will use a 120 volt fan to screw fresh ambient air to the Meanwell's ventilation intake.
The power supplies are not expensive. My rationalization tells me that a hundred thirty dollars worth of working and loafing Megawatts is cheaper than one sixty five dollar charred Megawatt.
I've got to do more research with those 600 watt boosters. How sad it is that I am thousands of miles from my package delivery pickup point.
I am not an expert in transistor design but something tells me pushing a transistor amperage limit with high(er) voltage is a heck of a lot riskier than with lower voltages. A 30 ampere rated bi-polar working at 12.00 volts is a lot more secure than one working at 15.5 volts. Efficiency losses by incorporating a DC to DC booster can be made up by adding more power supply potential or booster capacity. Remember, the batteries being charged have inherent current/voltage limits built in. Voltage is the key.
EDIT EDIT EDIT EDIT
Here is an AMAZON.COM search term to get you to one of the 600 watt DC to DC boosters who sez the incoming amperage limit is 15.0 Four of these puppies otta create quite a stir. Sixty amps? Enough voltage to strip the chrome off a bumper?
Generic DC-DC 600W 10-60V to 12-80V Boost Converter Step-up Module car Power Supply
by Generic
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Price: $25.47 & FREE Shipping
