Harold in CR
100 kW
OK. Lets see if I can lay out in detail my thoughts and viewer input requirements.
I am nearly finished building a portable band type sawmill. Logs will be softer type wood and only up to 15" diameter at breast height. Logs are from 7' to 15' long.
Our previously built sawmill had a 24HP gasoline engine and could pretty much charge through similar type logs. The sawing technique will be, slow feed of the blade depending on how the cutting goes. Until I get to use the mill, I have NO way of knowing how fast, how hard the blade will be working. I DO know the 8HP Honda gasoline engine I have will be slower than torture, but, would eventually get the job done painfully slow.
I have seen sawmills of this type powered by 15HP gasoline engines. I am NOT looking for big production from this mill. I have a small plantation of trees that we planted and my wife wants to add on to the end of our small house. I need 2" X 4" and 2" X 5" and a bunch on 1" X 3-4" for purlins to attach the metal roof panels to.
Now, first comment I received from another badboy thread, was about the battery voltage. I have 1 or possibly 2 banks of 30S Chevy Volt modules. My TOP voltage is not to be over 4.1V per cell which would be 123V. I already know that 111V is about nominal for the battery rating, BUT, I do not want to overcharge these cells. The motor will be under load as long as the blade is cutting, then, no load as the lumber is removed from the mill and the sawhead is gigged back to the original starting point for the next cut. From vast experience, I can imagine the load being applied for POSSIBLY 1-1.5 minutes per pass down the log. As the log gets thinner, the load will decrease some, so, constantly reducing load for up to half the volume of the logs.
I can be assured that the cutting of the wood would not be as severe on the battery/controller, compared to how John in CR takes off in traffic, at a hefty load and up hilly terrain and at 72V nominal of his 20S Chevy Volt battery pack. I have an older Curtis 144V 300Amp controller to use and a possibility of either a GM altermotor that was designed for 130V 3 phase, or an AC20 3 phase motor that I can't remember the name of, that this stuff was used to power a small electric car on the highway. Either motor is capable of more that the 15 HP gasoline sawmills down here.
In John's thread about badboy charging, I believe the sensus is that 117V AC from a house outlet will actually be around 164V or so after the bridge rectifier. This equates to around a 25% increase above the house 117V output. Solar Panels, for example, have about the same 25% more voltage open circuit same as the 117V open circuit from the house AC. My questions are, will the 164 peak DC voltage be detrimental to the cells or battery, per se. Also, what about the current rating available through the bridge rectifier ? Of course, fuses or circuit breaker would be in place for safety reasons. I have a 12/2 Romex, solid wire coil long enough to reach the log site and that would be approximately 80-100 feet long. I have enough to double up that 12/2 if need be.
If any more info is needed, kindly state so and I will try to oblige. Thanks for reading through all this info, Harold
I am nearly finished building a portable band type sawmill. Logs will be softer type wood and only up to 15" diameter at breast height. Logs are from 7' to 15' long.
Our previously built sawmill had a 24HP gasoline engine and could pretty much charge through similar type logs. The sawing technique will be, slow feed of the blade depending on how the cutting goes. Until I get to use the mill, I have NO way of knowing how fast, how hard the blade will be working. I DO know the 8HP Honda gasoline engine I have will be slower than torture, but, would eventually get the job done painfully slow.
I have seen sawmills of this type powered by 15HP gasoline engines. I am NOT looking for big production from this mill. I have a small plantation of trees that we planted and my wife wants to add on to the end of our small house. I need 2" X 4" and 2" X 5" and a bunch on 1" X 3-4" for purlins to attach the metal roof panels to.
Now, first comment I received from another badboy thread, was about the battery voltage. I have 1 or possibly 2 banks of 30S Chevy Volt modules. My TOP voltage is not to be over 4.1V per cell which would be 123V. I already know that 111V is about nominal for the battery rating, BUT, I do not want to overcharge these cells. The motor will be under load as long as the blade is cutting, then, no load as the lumber is removed from the mill and the sawhead is gigged back to the original starting point for the next cut. From vast experience, I can imagine the load being applied for POSSIBLY 1-1.5 minutes per pass down the log. As the log gets thinner, the load will decrease some, so, constantly reducing load for up to half the volume of the logs.
I can be assured that the cutting of the wood would not be as severe on the battery/controller, compared to how John in CR takes off in traffic, at a hefty load and up hilly terrain and at 72V nominal of his 20S Chevy Volt battery pack. I have an older Curtis 144V 300Amp controller to use and a possibility of either a GM altermotor that was designed for 130V 3 phase, or an AC20 3 phase motor that I can't remember the name of, that this stuff was used to power a small electric car on the highway. Either motor is capable of more that the 15 HP gasoline sawmills down here.
In John's thread about badboy charging, I believe the sensus is that 117V AC from a house outlet will actually be around 164V or so after the bridge rectifier. This equates to around a 25% increase above the house 117V output. Solar Panels, for example, have about the same 25% more voltage open circuit same as the 117V open circuit from the house AC. My questions are, will the 164 peak DC voltage be detrimental to the cells or battery, per se. Also, what about the current rating available through the bridge rectifier ? Of course, fuses or circuit breaker would be in place for safety reasons. I have a 12/2 Romex, solid wire coil long enough to reach the log site and that would be approximately 80-100 feet long. I have enough to double up that 12/2 if need be.
If any more info is needed, kindly state so and I will try to oblige. Thanks for reading through all this info, Harold