If you overvolted it to 60v you would almost have 4kW 3720w about 5hp although I doubt it is a continuous rated motor especially with the overvolting.Any opinions on this motor? Drive motor from 6000lb crown pallet jack. I'd like to run it at 48v but I'm not sure it's enough power.
But that's not true. Electric motors are routinely rated according to various non-continuous duty cycles.Remember that motor ratings are typically Continuous and ICE ratings are Peak.
I think part of the reason you are having trouble finding the right motor is because you are focusing on the wrong things. The original ICE engine has 12hp but that is not directly comparable to an electric motor.I don't know either. I'm just going by the fact that the original engine was 12hp to 18hp depending on the model. That would be somewhere around 9 to 13kw. I know that electric motors provide more low end torque but I don't know how much different it would be.
Using which efficiency numbers ?One of the simplest ways of working out energy use is to monitor gas consumption, if that is an option still.
One of the simplest ways of working out energy use is to monitor gas consumption, if that is an option still.
10% seems pessimistic to me, although it might be a reasonable approximation. Specific fuel consumption (amount of fuel consumed per unit of shaft energy produced) is readily available for many engines. I couldn't find a BSFC chart for any small engine in a quick seach, but some list consumption at rated power, such as a Honda GX160 consuming 1.4 L/h at 3,600rpm to produce 2.9 kW - that's about 0.5 L/kWh (or 0.5 L/h or 0.13 US gal/h per kW of output). In mass terms, it's roughly 360 g/kWh or about 23%. Consumption will be better at lower speed and full load, and worse at part load.10% would be a good rule of thumb for a small engine.
yup, just a rule of thumb, average eff at optimum load won't be equal to total eff etc. A five minute google comes up with this graph10% seems pessimistic to me
Yes, but running at half power in the cases shown in that graph only lose about 25% of peak efficiency... getting down to 10% means starting really low. That paper studies some very low compression ratios in a research engine, with the point being to compare compression ratios and fuels, rather than to represent typical commercially available engines.yup, just a rule of thumb, average eff at optimum load won't be equal to total eff etc. A five minute google comes up with this graph
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What do you need RPM for?Thanks for all the advice. I can get the pump motor for $100 or the 11" drive motor for $200. Both out of an old Clark EC500 forklift. I'm tempted to go with the big one but I'm afraid the RPMs will be pretty low at 48v.