Meg Battery Voltage

mempilot · 7th July 2007, 14:01

Quote: (Originally Posted by jan)

Maybe a bit of topic but could have your interest in the "nice to know" category.
I made a test to se how low the Meg actually would alow the battery to go. I stopped diving the unit at 4,2V. The solonoid still worked but the display faded away each time it fired and slowly activated again. Water temperatur at around 6-8 degrees.

What solenoid do you have? I have the older Wattmiser and it defineatly stops firing below the rated 5.2 volts.

**wedivebc** · 7th July 2007, 14:49

Quote: (Originally Posted by mempilot)

What solenoid do you have? I have the older Wattmiser and it defineatly stops firing below the rated 5.2 volts.

I was wondering why your battery life was so much less than mine, I guess it is because I have a jaksa solenoid. The only other comment I would make is I once left my unit set point at .7 for a couple of hours prior to diving and found my batter had lost significant voltage. It seems the solenoid had been injecting quite a bit of O2 that was not being circulated and was not getting picked up at the sensors.

***jradomski*** · 13th July 2007, 05:01

Quote: (Originally Posted by mempilot)

What solenoid do you have? I have the older Wattmiser and it defineatly stops firing below the rated 5.2 volts.

NOT MEG SPECIFIC
if there is sufficient current the wattmeizer solenoids will definately fire with voltages below 5.2v.. the solenoids are rated for about 100ma drive at 6v, if you drop the voltage down the current requirement goes up.. on a test bench the lowest voltage combined with the highest pressure I was able to get a solenoid to trip was at 450 psi ( 3x the rated pressure) and 4.2v... I found regardless of the pressure around 4v was the minimum voltage I was able to get solenoid to trip.. Running the Oxygen IP at 100 PSI would consume alot less power than running it at 150psi, and would trip at a lower voltage on weak batteries.

The JASKA solenoids have a smaller orifice so they have a higher pressure rating so at similiar IPs the jaska would take a bit less power, but if you were to try and match the flow rates, you would have to jack up the pressure on the JASKA (and therefor the current draw)...

mempilot · 13th July 2007, 05:13

Thanks for the explanation! Makes a lot more sense now.

Quote: (Originally Posted by jradomski)

NOT MEG SPECIFIC
if there is sufficient current the wattmeizer solenoids will definately fire with voltages below 5.2v.. the solenoids are rated for about 100ma drive at 6v, if you drop the voltage down the current requirement goes up.. on a test bench the lowest voltage combined with the highest pressure I was able to get a solenoid to trip was at 450 psi ( 3x the rated pressure) and 4.2v... I found regardless of the pressure around 4v was the minimum voltage I was able to get solenoid to trip.. Running the Oxygen IP at 100 PSI would consume alot less power than running it at 150psi, and would trip at a lower voltage on weak batteries.

The JASKA solenoids have a smaller orifice so they have a higher pressure rating so at similiar IPs the jaska would take a bit less power, but if you were to try and match the flow rates, you would have to jack up the pressure on the JASKA (and therefor the current draw)...

***jradomski*** · 13th July 2007, 05:57

Quote: (Originally Posted by mempilot)

Thanks for the explanation! Makes a lot more sense now.

no problem...

BTW the solenoid might work above 450 psi, but I figured that was the highest pressure that I should try.. Industrial controls usually are tested at 3x their rated working pressures...

7th July 2007, 14:01	#11 (permalink)
mempilot What is this..terrafirma? Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Aug 2006 Location: Ft. Lauderdale Posts: 1,114	Re: Meg Battery Voltage Quote: (Originally Posted by jan) Maybe a bit of topic but could have your interest in the "nice to know" category. I made a test to se how low the Meg actually would alow the battery to go. I stopped diving the unit at 4,2V. The solonoid still worked but the display faded away each time it fired and slowly activated again. Water temperatur at around 6-8 degrees. What solenoid do you have? I have the older Wattmiser and it defineatly stops firing below the rated 5.2 volts. __________________ MEM "Da Pilot" Black holes are where God divided by zero. "If at first you don't succeed, don't dive silent." "Would you mind not shooting at the thermo-nuclear weapons." ~ Vic Deakins "Donkey's kill more people annually than plane crashes."
(Offline)

7th July 2007, 14:49	#12 (permalink)
wedivebc FIGJAM Current Rebreather/s: Megalodon Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Other CCR Join Date: Feb 2005 Location: Vancouver Island BC Canada Posts: 1,339	Re: Meg Battery Voltage Quote: (Originally Posted by mempilot) What solenoid do you have? I have the older Wattmiser and it defineatly stops firing below the rated 5.2 volts. I was wondering why your battery life was so much less than mine, I guess it is because I have a jaksa solenoid. The only other comment I would make is I once left my unit set point at .7 for a couple of hours prior to diving and found my batter had lost significant voltage. It seems the solenoid had been injecting quite a bit of O2 that was not being circulated and was not getting picked up at the sensors. __________________ Cheers, Dave.... Man is the only animal burdened with the knowledge he will eventually die
(Offline)

13th July 2007, 05:01	#13 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,800	Re: Meg Battery Voltage Quote: (Originally Posted by mempilot) What solenoid do you have? I have the older Wattmiser and it defineatly stops firing below the rated 5.2 volts. NOT MEG SPECIFIC if there is sufficient current the wattmeizer solenoids will definately fire with voltages below 5.2v.. the solenoids are rated for about 100ma drive at 6v, if you drop the voltage down the current requirement goes up.. on a test bench the lowest voltage combined with the highest pressure I was able to get a solenoid to trip was at 450 psi ( 3x the rated pressure) and 4.2v... I found regardless of the pressure around 4v was the minimum voltage I was able to get solenoid to trip.. Running the Oxygen IP at 100 PSI would consume alot less power than running it at 150psi, and would trip at a lower voltage on weak batteries. The JASKA solenoids have a smaller orifice so they have a higher pressure rating so at similiar IPs the jaska would take a bit less power, but if you were to try and match the flow rates, you would have to jack up the pressure on the JASKA (and therefor the current draw)... __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
(Online)

13th July 2007, 05:13	#14 (permalink)
mempilot What is this..terrafirma? Current Rebreather/s: Megalodon Other Rebreather/s: Megalodon Join Date: Aug 2006 Location: Ft. Lauderdale Posts: 1,114	Re: Meg Battery Voltage Thanks for the explanation! Makes a lot more sense now. Quote: (Originally Posted by jradomski) NOT MEG SPECIFIC if there is sufficient current the wattmeizer solenoids will definately fire with voltages below 5.2v.. the solenoids are rated for about 100ma drive at 6v, if you drop the voltage down the current requirement goes up.. on a test bench the lowest voltage combined with the highest pressure I was able to get a solenoid to trip was at 450 psi ( 3x the rated pressure) and 4.2v... I found regardless of the pressure around 4v was the minimum voltage I was able to get solenoid to trip.. Running the Oxygen IP at 100 PSI would consume alot less power than running it at 150psi, and would trip at a lower voltage on weak batteries. The JASKA solenoids have a smaller orifice so they have a higher pressure rating so at similiar IPs the jaska would take a bit less power, but if you were to try and match the flow rates, you would have to jack up the pressure on the JASKA (and therefor the current draw)... __________________ MEM "Da Pilot" Black holes are where God divided by zero. "If at first you don't succeed, don't dive silent." "Would you mind not shooting at the thermo-nuclear weapons." ~ Vic Deakins "Donkey's kill more people annually than plane crashes."
(Offline)

13th July 2007, 05:57	#15 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,800	Re: Meg Battery Voltage Quote: (Originally Posted by mempilot) Thanks for the explanation! Makes a lot more sense now. no problem... BTW the solenoid might work above 450 psi, but I figured that was the highest pressure that I should try.. Industrial controls usually are tested at 3x their rated working pressures... __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
(Online)

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