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Converting a miniature excavator to battery power
#11
Right.... Orion Jr BMS, eltek flatpack charger, leaf cells... All I need now is to decide on a motor/controller combination. Does anyone have experience with the golden motor 3kW (5kW peak) motor and controller?
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#12
(08-29-2019, 04:13 AM)Jon Wrote: You need closed centre rather than open centre hydraulics to run that style of system.

Had to look up the differences Tongue

Couldn't you just put a sensor on each outflow port? Sure it would require more sensors, but would it work?
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#13
(08-29-2019, 07:48 AM)Korishan Wrote:
(08-29-2019, 04:13 AM)Jon Wrote: You need closed centre rather than open centre hydraulics to run that style of system.

Had to look up the differences  Tongue

Couldn't you just put a sensor on each outflow port? Sure it would require more sensors, but would it work?
Yes, or put microswitches on the levers so when you go to move a lever, the pump starts.

I've just realised, I need a motor controller that has a cruise control mode - it needs to maintain a governed speed independent of motor load. Can't have the motor slowing down when the hydraulic pump loads up.

GoldenMotor controller definitely has this, I'm also looking at the Shinegle 5Kw motor kit (might be cheaper), not sure if this controller has a constant speed capability.

For some reason I can't attach the power curve .jpg for the 5Kw motor Sad


.pdf   5kw AC motor and controller specification .pdf (Size: 191.99 KB / Downloads: 12)
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#14
(08-29-2019, 07:48 AM)Korishan Wrote:
(08-29-2019, 04:13 AM)Jon Wrote: You need closed centre rather than open centre hydraulics to run that style of system.

Had to look up the differences Tongue

Couldn't you just put a sensor on each outflow port? Sure it would require more sensors, but would it work?

Technically yes, if you were going to go to that sort of extent you could probably put strain gauges on the levers to sense control input. That would happen before the system pressures changed at all. Most machines don’t have operators in the seat without them doing something for extended periods of time. The hydraulic system cycling fluid without any load will draw very little energy as a percentage of daily use.
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#15
Jon, are you in the UK bychance?
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#16
Shinegle controller manual attached, for reference. Has anyone used this motor/controller combo?


.pdf   SG Controller 12X2.pdf (Size: 905.92 KB / Downloads: 12)
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#17
(08-29-2019, 08:15 AM)HughF Wrote: Jon, are you in the UK bychance?

Hi Hugh
No, a bit north of Brisbane, Queensland, Australia.
A cool project you have going Smile I hope you share progress
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#18
(08-29-2019, 09:50 PM)Jon Wrote:
(08-29-2019, 08:15 AM)HughF Wrote: Jon, are you in the UK bychance?

Hi Hugh
No, a bit north of Brisbane, Queensland, Australia.
A cool project you have going Smile I hope you share progress
I will keep the group informed of my progress... I'll probably convert my powered wheelbarrow to electric power too... 

Korishan likes this post
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#19
Interesting project...

The 3kW motor will more than likely out perform the 5kW petrol on torque. The motor will need to be geared down quite a bit. Find out the model and efficiency chart for the primary hydraulic pump and then match the rpm output from the motor.

Is the primary pump a single or multiple unit ? Does the flow divide up between boom and turn/motion or is it multiple output ?

"Yes, or put microswitches on the levers so when you go to move a lever, the pump starts." - this might have an issue with starting torque if the system has a load.

Does the pump have a centrifugal clutch between engine and pump ? This is the default and easiest way to unload or gradualy load the pump, I have done this approach on 3 hydrostatic machines I built (1 x 10hp diesle and 2 x 20ph v-twin petrol).

I am looking to build a hybrid electric/hydrostatic or all electric off road unit but the motors are the main issue (waterproofing on bearings for submergence) hence hydrostatic hybrid so the hydralic motors can sit underwater when traversing a river.

The wheelbarrow could be quite interesting, could use a geared stepper for the lift. Depends on how heavy or much weight you have to play with for the electrics.
https://www.omc-stepperonline.com/nema-4...-fili.html
Stepper driver and separate CNC style controller (use stop limits and start/stop).
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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#20
The gas motor runs at 3600 maximum, j usually run it around 2800-3000 for smoothness of operation. I think the 3kW golden motor has an ideal power curve for direct coupling to the pump.

The pump is a simple, single pump, no clutch. It is a walking digger (like a towable backhoe) so has a slewing ram but does not have traverse motors.

I'm just pricing up battery options at the moment. Aiming for 4 ish kWh at 48v, if I can
jdeadman likes this post
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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