Forum Discussion
pnichols
Aug 19, 2015Explorer II
Steady state wattage output of the Honda EU1000i is specified to be 900 watts.
Divide 900 generator output watts by 14.4 charger output direct current volts - and you get 62.5 amps ... that a theoretically 100% efficient charger powered by a Honda EU1000i generator could theoretically dump into RV batteries if the batteries would accept that much current with 14.4 direct current volts on their terminals.
Now, if the charger is only 70% efficient - multiply 62.5 amps times 70% and you get 43.75 amps ... that a Honda EU1000i generator could really dump into RV batteries if the batteries would accept that much current with 14.4 direct current volts on their terminals.
The above is one of the reasons I recommend use of chargers that are power factor corrected. These type chargers are harder to find and cost more when you do find them, but they are more efficient and hence make better use of a small generator's output wattage capacity.
IMHO, small generators can be excellent appliances to have along for RV camping if they are targeted primarily for RV battery charging, and with a full understanding of how to best make use of their more limited capacities. We use ours for any-weather any-time battery charging that is - a very quiet 54dB all the time (single speed) and sips the gas at a one-half gallon every 4-5 hours rate. As for other uses, instead of firing up the big Onan the little genny can: Run a hair dryer on low, run the RV's vacuum cleaner, run big indoor or outdoor fans in moderately hot weather, run some power tools, run many kitchen appliances, charge all other small batteries in the RV, and ... get the RV started in the rare emergency of BOTH a too-low engine starting battery and too-low RV batteries.
Of course inverters can be used in many of the above situations instead of a generator, but eventually one has to Pay the Piper when inverters run batteries down ... and that can be done with a small generator run long and quiet with or without the sun.
Divide 900 generator output watts by 14.4 charger output direct current volts - and you get 62.5 amps ... that a theoretically 100% efficient charger powered by a Honda EU1000i generator could theoretically dump into RV batteries if the batteries would accept that much current with 14.4 direct current volts on their terminals.
Now, if the charger is only 70% efficient - multiply 62.5 amps times 70% and you get 43.75 amps ... that a Honda EU1000i generator could really dump into RV batteries if the batteries would accept that much current with 14.4 direct current volts on their terminals.
The above is one of the reasons I recommend use of chargers that are power factor corrected. These type chargers are harder to find and cost more when you do find them, but they are more efficient and hence make better use of a small generator's output wattage capacity.
IMHO, small generators can be excellent appliances to have along for RV camping if they are targeted primarily for RV battery charging, and with a full understanding of how to best make use of their more limited capacities. We use ours for any-weather any-time battery charging that is - a very quiet 54dB all the time (single speed) and sips the gas at a one-half gallon every 4-5 hours rate. As for other uses, instead of firing up the big Onan the little genny can: Run a hair dryer on low, run the RV's vacuum cleaner, run big indoor or outdoor fans in moderately hot weather, run some power tools, run many kitchen appliances, charge all other small batteries in the RV, and ... get the RV started in the rare emergency of BOTH a too-low engine starting battery and too-low RV batteries.
Of course inverters can be used in many of the above situations instead of a generator, but eventually one has to Pay the Piper when inverters run batteries down ... and that can be done with a small generator run long and quiet with or without the sun.
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