- Batteries protected ... from slow discharge, or charging when connected ... by being totally and completely isolated automatically when not in use.
- High voltage isolated ... otherwise things will melt, or zap people ... this is important because I am likely to increase the voltage in this or later designs.
- Sparks eliminated ... using pre-charge ... important because controller will change and voltage and amperage will increase, in this or later models.
Component List
- Part ZT2193 ... being BD681 NPN Transistor
- Part SY4052 ... being relay DPDT 12V DC - Coil 285 ohms 2x5A @ 30VDC
- Part RR0556 ... being 220 Ohm 1/2 watt 1% resistors
- Part ZV1515 ... being 15V 1A voltage regulator
- Part RR3274 ... being 100 Ohm 5 watt 5% carbon film resistor
- Part HG9980 ... being 5 sheets "Press N Peel PCB film"
- Part HP9514 ... being Blank Fibreglass PCB 150mm x 75mm
- Part NC4254 ... being Ammonium Persulphate
- Part SP0753 ... being Momentary "on" switch, with 12volt illumnation
- Part HB6004 ... blue Jiffy Box
- Push button (normally open)
- Push button (normally closed)
Component Info: Relay
- Jaycar SY4052 ... being relay DPDT 12V DC - Coil 285 ohms 2x5A @ 30VDC
- This is a "FRM1-2C2" relay. Spec sheet at: http://www.khalus.com.ua/data/chips/chameleon-relay/pdf/frm/frm1.pdf
- ... 285 ohms means 42mA to run it.
- "Must operate" at 75% of 12V = 9V. "Absolute Maximum" coil voltage = 110% of 12V = 13.2V
- Means "voltage divider" circuit of a series of resistors ... 220 ohms, 220 ohms, 220 ohms ... then switch ... then relay coil. This means minimum 9.04Volts through the coil, and maximum 12.66volts (when battery fully charged).
- At R3 = 42v max, At R2 = 32V, At R3 = 22V, at switch at relay = 12.9volts max, and 9.2volts (when batteries are at 40V) ... so each resistor sees 0.455 watts.
Components: Circuit Breaker
- Thermal circuit breakers are very slow (4 seconds to turn off ... how long for short circuit ?)
- A Magnetic circuit breaker will trip very fast (10ms for 1.5 times rate current, 2ms for 4 times rated current, or higher) - see Farnell part 9540768 ... 25A, 80VDC. $66.39.
- Circuit breakers are "hydro" (to slow down the trip speed ... slightly delayed).
- (Perhaps) shouldn't use under-rated ... because they won't be able to stop the spark (ie cut the power) at higher voltages, and higher amperages.
- Magnetic circuit breaker: http://www.marinenutz.com/products/Paneltronics-A-Frame-Magnetic-Circuit-Breaker-%252d-CE-%252d-25-Amp-%252d-Single-Pole-%252d-Black.html
......Alternative #1: $26.95 ... Jaycar CAT. NO. SF2265 - being 100A Amp Circuit Breaker ...
- Maximum 50VDC
- Will trip at 110A.
- !!! Will trip within milliseconds at short circuit !!!
......Alternative #2: $8.85 ... Jaycar CAT. NO. SF2261 - being 25 Amp Circuit Breaker ...
- Maximum 50VDC
- Will last indefinitely at 25A.
- Will trip within 1 hour for 31.25A (125% maximum)
- Will trip within 4 seconds for of 37.5A (150% maximum)
