Re: 12V Power Distribution Question


Aug 19, 2011

 


----------------------------

#32804 Aug 19, 2011

I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright



AP Mach 1 mount

SBIG ST2000XM camera

Laptop Computer

MoonLite Focuser

DC powered USB hub



I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).



I would count on either battery to last for two nights without recharging and would then charge each one every other day.



Does this sound like the optimum way to manage my power requirements? What issues might I run into?



Thanks!



----------------------------

#32807 Aug 19, 2011

I believe that you will be ok with that setup. Laptops don't generate

voltage spikes on the battery, it is the dew removers that sometimes cause

problems.



Rolando



In a message dated 8/19/2011 9:26:20 AM Central Daylight Time,

wayneh9026@... writes:



> I have the following DC-powered equipment and 2 high capacity deep cycle

> batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power

> them for four-five nights (assume 7 hours per night max). I do have a solar

> charger that can top off one battery during a day, given that the day is

> bright

>

> AP Mach 1 mount

> SBIG ST2000XM camera

> Laptop Computer

> MoonLite Focuser

> DC powered USB hub

>

> I know it is recommended to have separate power sources for both the mount

> and the camera, but that's not feasible. My tentative plan is to power the

> laptop off the marine battery and power the remaining equipment off the

> AGM battery going through the new Kendrick ePack 12

> (www.kendrickastro.com/astro/battery.html).

>

> I would count on either battery to last for two nights without recharging

> and would then charge each one every other day.

>

> Does this sound like the optimum way to manage my power requirements? What

> issues might I run into





[Non-text portions of this message have been removed]



----------------------------

#32808 Aug 19, 2011

do you have time to check this out in your back yard before heading out on the road?



i find the laptop sucks the most power. i connect my laptop and camera (STL-11000) to a 75aH deep cycle AGM battery. it needs recharging in the morning. i connect guider, focuser, and mount (AP900) to a 33aH AGM battery. that too needs recharging -- it's not as run down as the bigger battery but no way i would expect it to last another night.



and unless you are recharging at 7-8amps, i think you will find it takes ALL DAY (12+ hrs) to recharge those 75aH batteries. after limping through a 4 day outing recently, i ordered a bigger/better charger when i got back to reduce the charge time of the larger battery (www.batterystuff.com/battery-chargers/12-volt/gel-cell/BM12248.html).



if your solar charging panels only put out a few amps, i don't think you will get your batteries recharged.



consider taking a Honda eu2000 generator for recharging during the day... (not suggesting you run it at night... too annoying)



Lee

--- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@...> wrote:

>

> I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

>

> AP Mach 1 mount

> SBIG ST2000XM camera

> Laptop Computer

> MoonLite Focuser

> DC powered USB hub

>

> I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

>

> I would count on either battery to last for two nights without recharging and would then charge each one every other day.

>

> Does this sound like the optimum way to manage my power requirements? What issues might I run into?

>

> Thanks!

>



----------------------------

#32810 Aug 19, 2011

I'm gonna try it in a dry run taking a bunch of darks overnight while everything is hooked up. I have been seriously thinking of a Honda or Yamaha generator. Several people had them at the last star party and they were surprisingly quiet. My solar panel is rated at 52 watts if I recal, so that's 4-5 amps so probably couldn't get fully recharged in a day, but hopefully enough to get by.

--- In ap-gto@yahoogroups.com, "lmbuck2000" lmbuck2000@...> wrote:

>

>

>

> do you have time to check this out in your back yard before heading out on the road?

>

> i find the laptop sucks the most power. i connect my laptop and camera (STL-11000) to a 75aH deep cycle AGM battery. it needs recharging in the morning. i connect guider, focuser, and mount (AP900) to a 33aH AGM battery. that too needs recharging -- it's not as run down as the bigger battery but no way i would expect it to last another night.

>

> and unless you are recharging at 7-8amps, i think you will find it takes ALL DAY (12+ hrs) to recharge those 75aH batteries. after limping through a 4 day outing recently, i ordered a bigger/better charger when i got back to reduce the charge time of the larger battery (www.batterystuff.com/battery-chargers/12-volt/gel-cell/BM12248.html).

>

> if your solar charging panels only put out a few amps, i don't think you will get your batteries recharged.

>

> consider taking a Honda eu2000 generator for recharging during the day... (not suggesting you run it at night... too annoying)

>

> Lee

>

> --- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@> wrote:

> >

> > I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

> >

> > AP Mach 1 mount

> > SBIG ST2000XM camera

> > Laptop Computer

> > MoonLite Focuser

> > DC powered USB hub

> >

> > I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

> >

> > I would count on either battery to last for two nights without recharging and would then charge each one every other day.

> >

> > Does this sound like the optimum way to manage my power requirements? What issues might I run into?

> >

> > Thanks!

> >

>







----------------------------

#32844 Aug 20, 2011

I would try to stay away from the Yamaha. .I went to their site to find a certified repair facility. .They listed a lot of places for certified repair service for their generator. .I called every place listed in my state (and in adjacent states), and everyone I called said they did not service the generators. .Most said they did not even sell the generators. .I e-mailed Yamaha to ask them where I could get Yamaha warranty service on the generator. .They never responded to the e-mail. .So if you buy a Yamaha and have a problem you have few places to go for service. .Incidentally, I did the research because I was considering the purchase of one, and I read that Yamaha did not maintain a good support network.

I ended up buying the Honda EU2000i. .It has clean power; it is very quiet, and the "Northern Tool" store gives warranty support. .I spoke to their service department manager before buying. .He said Honda had a strong support network if you ever needed parts or repairs. .Mine has run flawlessly though. .It can also power my hair dryer if I need to knock the dew of of something.

Alan

--- On Sat, 8/20/11, Louis Mamakos louie@...> wrote:



From: Louis Mamakos louie@...>

Subject: Re: [ap-gto] 12V Power Distribution Question

To: ap-gto@yahoogroups.com

Date: Saturday, August 20, 2011, 4:27 PM



I have a Honda EU2000i generator and have been very pleased with it.. It generates quite clean power, with an inverter and it will operate at a lower throttle (with lower audible noise) when not under heavy load.. I used to use it at star parties for charging batteries during the day as suggested, and it also has enough oomph to run a small microwave oven.



These days, I've been using it to power my roll-off roof observatory equipment since the observatory is almost 200 yards from the house, and I've not yet invested digging a very long trench, and buying conduit and wire for the long run.. The Honda has run for many, many hours in this application, each night that I'm out imaging.



Louis Mamakos





On Aug 20, 2011, at 1:27 AM, Wayne wrote:



> I'm gonna try it in a dry run taking a bunch of darks overnight while everything is hooked up. I have been seriously thinking of a Honda or Yamaha generator. Several people had them at the last star party and they were surprisingly quiet. My solar panel is rated at 52 watts if I recal, so that's 4-5 amps so probably couldn't get fully recharged in a day, but hopefully enough to get by.

>

> --- In ap-gto@yahoogroups.com, "lmbuck2000" lmbuck2000@...> wrote:

>>

>>

>>

>> do you have time to check this out in your back yard before heading out on the road?

>>

>> i find the laptop sucks the most power.. i connect my laptop and camera (STL-11000) to a 75aH deep cycle AGM battery.. it needs recharging in the morning.. i connect guider, focuser, and mount (AP900) to a 33aH AGM battery.. that too needs recharging -- it's not as run down as the bigger battery but no way i would expect it to last another night.

>>

>> and unless you are recharging at 7-8amps, i think you will find it takes ALL DAY (12+ hrs) to recharge those 75aH batteries.. after limping through a 4 day outing recently, i ordered a bigger/better charger when i got back to reduce the charge time of the larger battery (www.batterystuff.com/battery-chargers/12-volt/gel-cell/BM12248.html)..

>>

>> if your solar charging panels only put out a few amps, i don't think you will get your batteries recharged.

>>

>> consider taking a Honda eu2000 generator for recharging during the day... (not suggesting you run it at night... too annoying)

>>

>> Lee

>>

>> --- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@> wrote:

>>>

>>> I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

>>>

>>> AP Mach 1 mount

>>> SBIG ST2000XM camera

>>> Laptop Computer

>>> MoonLite Focuser

>>> DC powered USB hub

>>>

>>> I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

>>>

>>> I would count on either battery to last for two nights without recharging and would then charge each one every other day.

>>>

>>> Does this sound like the optimum way to manage my power requirements? What issues might I run into?

>>>

>>> Thanks!

>>>

>>

>

>

>

>

---------------

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

>

>

>







---------------



To UNSUBSCRIBE, or for general information on the ap-gto list

see groups.yahoo.com/group/ap-gtoYahoo! Groups Links











[Non-text portions of this message have been removed]



----------------------------

#32846 Aug 20, 2011

Alan, that's good to know. Thanks



Wayne

--- In ap-gto@yahoogroups.com, Alan Pryor adpryor1953@...> wrote:

>

> I would try to stay away from the Yamaha. .I went to their site to find a certified repair facility. .They listed a lot of places for certified repair service for their generator. .I called every place listed in my state (and in adjacent states), and everyone I called said they did not service the generators. .Most said they did not even sell the generators. .I e-mailed Yamaha to ask them where I could get Yamaha warranty service on the generator. .They never responded to the e-mail. .So if you buy a Yamaha and have a problem you have few places to go for service. .Incidentally, I did the research because I was considering the purchase of one, and I read that Yamaha did not maintain a good support network.

> I ended up buying the Honda EU2000i. .It has clean power; it is very quiet, and the "Northern Tool" store gives warranty support. .I spoke to their service department manager before buying. .He said Honda had a strong support network if you ever needed parts or repairs. .Mine has run flawlessly though. .It can also power my hair dryer if I need to knock the dew of of something.

> Alan

>

> --- On Sat, 8/20/11, Louis Mamakos louie@...> wrote:

>

> From: Louis Mamakos louie@...>

> Subject: Re: [ap-gto] 12V Power Distribution Question

> To: ap-gto@yahoogroups.com

> Date: Saturday, August 20, 2011, 4:27 PM

>

> I have a Honda EU2000i generator and have been very pleased with it.. It generates quite clean power, with an inverter and it will operate at a lower throttle (with lower audible noise) when not under heavy load.. I used to use it at star parties for charging batteries during the day as suggested, and it also has enough oomph to run a small microwave oven.

>

> These days, I've been using it to power my roll-off roof observatory equipment since the observatory is almost 200 yards from the house, and I've not yet invested digging a very long trench, and buying conduit and wire for the long run.. The Honda has run for many, many hours in this application, each night that I'm out imaging.

>

> Louis Mamakos

>

>

> On Aug 20, 2011, at 1:27 AM, Wayne wrote:

>

> > I'm gonna try it in a dry run taking a bunch of darks overnight while everything is hooked up. I have been seriously thinking of a Honda or Yamaha generator. Several people had them at the last star party and they were surprisingly quiet. My solar panel is rated at 52 watts if I recal, so that's 4-5 amps so probably couldn't get fully recharged in a day, but hopefully enough to get by.

> >

> > --- In ap-gto@yahoogroups.com, "lmbuck2000" lmbuck2000@> wrote:

> >>

> >>

> >>

> >> do you have time to check this out in your back yard before heading out on the road?

> >>

> >> i find the laptop sucks the most power.. i connect my laptop and camera (STL-11000) to a 75aH deep cycle AGM battery.. it needs recharging in the morning.. i connect guider, focuser, and mount (AP900) to a 33aH AGM battery.. that too needs recharging -- it's not as run down as the bigger battery but no way i would expect it to last another night.

> >>

> >> and unless you are recharging at 7-8amps, i think you will find it takes ALL DAY (12+ hrs) to recharge those 75aH batteries.. after limping through a 4 day outing recently, i ordered a bigger/better charger when i got back to reduce the charge time of the larger battery (www.batterystuff.com/battery-chargers/12-volt/gel-cell/BM12248.html)..

> >>

> >> if your solar charging panels only put out a few amps, i don't think you will get your batteries recharged.

> >>

> >> consider taking a Honda eu2000 generator for recharging during the day... (not suggesting you run it at night... too annoying)

> >>

> >> Lee

> >>

> >> --- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@> wrote:

> >>>

> >>> I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

> >>>

> >>> AP Mach 1 mount

> >>> SBIG ST2000XM camera

> >>> Laptop Computer

> >>> MoonLite Focuser

> >>> DC powered USB hub

> >>>

> >>> I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

> >>>

> >>> I would count on either battery to last for two nights without recharging and would then charge each one every other day.

> >>>

> >>> Does this sound like the optimum way to manage my power requirements? What issues might I run into?

> >>>

> >>> Thanks!

> >>>

> >>

> >

> >

> >

> >

---------------

> >

> > To UNSUBSCRIBE, or for general information on the ap-gto list

> > see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

> >

> >

> >

>

>

>

---------------

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

>

>

>

>

>

> [Non-text portions of this message have been removed]

>







----------------------------

#32847 Aug 20, 2011

I like your approach. .

I use a laptop the is EnergyStar rated. .The battery on it last 6 hours, and I bring a spare. .I also have a laptop charger that comes directly off of a 12 volt battery. .No inverter is used.

I personally like the 33 amp-hour deep cycle batteries. .They only weight about 25 pounds so they are not very hard on my back. .I do bring several of them. .One of them is just in case for the laptop or if one of the others drains too much, which never happens. .One is for the CCD. .One is for the dew heaters, and the other is for the mount. .Typically, I only use 3 batteries in one night.

I do have a 65 amp-hour deep-cycle battery for an emergency, just in case I need more power or I need to run an inverter.

I do have a 125 watt true sine wave inverter just in case I want to use my FLEA3 video camera for planetary photography. .In that case, I need 120 volts of true sine wave power as opposed to the modified sine wave that most inverters provide.

Lastly, I have a 2000 watt Honda generator. .It is a EU2000i which produces clean true sine wave power for electronics. .It can also provide power for my hair dryer. .I have no hair, but I do like to knock dew off of something on occasion. .Additionally, I can use it to charge batteries. .Since I have two spare batteries so I can recharge day or night. .The generator is very quiet, so noise is not an issue. .Plus, the generator only weighs 50 pounds when fully fueled. .So it is very portable. .

Alan

--- On Sat, 8/20/11, charles.bradshaw cbradshaw1@...> wrote:



From: charles.bradshaw cbradshaw1@...>

Subject: [ap-gto] Re: 12V Power Distribution Question

To: ap-gto@yahoogroups.com

Date: Saturday, August 20, 2011, 12:37 PM



I have the Honda 1000 watt generator and it is very quiet, but I yet to need it a a star party.. I take 3 batteries: a 117 AH deep-cycle marine battery, a Celestron 17 AH power tank, a B&D jump starter with a built in inverter.. The deep-cycle battery powers the mount, dew heaters etc., the Celestron powers the computer, and I use the B&D to inflate air mattresses and for charging my wife's iPod and as an emergency backup.



The 117 AH battery can last 2 nights unles I've been slewing all over the sky.. The Celestron will last about 7 hours on a charge and my internal laptop battery another 4.. The B&D does not get enough use to need recharging over 3 days.



However, there are caveats.. I don't use an inverter.. I have a DC-DC coupler for my laptop, which saves a lot of wasted power.. I also use direct 12VDC for my DSLRs and dew heaters.. Inverters are not very efficent.



I use a $50 Shumacher battery charger to charge the Celestron and deep-cycle, 2 amps for the Celetron and 15 amps for the deep cycle, but it takes all day to charge both



Hope this helps.



Charlie





--- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@...> wrote:

>

> I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

>

> AP Mach 1 mount

> SBIG ST2000XM camera

> Laptop Computer

> MoonLite Focuser

> DC powered USB hub

>

> I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

>

> I would count on either battery to last for two nights without recharging and would then charge each one every other day.

>

> Does this sound like the optimum way to manage my power requirements? What issues might I run into?

>

> Thanks!

>









---------------



To UNSUBSCRIBE, or for general information on the ap-gto list

see groups.yahoo.com/group/ap-gtoYahoo! Groups Links











[Non-text portions of this message have been removed]



----------------------------

#32848 Aug 20, 2011

Thanks, The key to getting keeping the power requirements to a minimum is to use the laptop's battery in power saver mode and only plug in the Celestron power when the laptop's battery is almost drained and using it to recharge the laptop's battery. That way, the laptop manages on minimum power with it's internal battery. The power saver does not seem to be used when the laptop is plugged into an external source. I also turn my wireless modem off, since there is seldom any WiFi available at the dark sites. Like you, I also take 2 laptop batteries.



Regards,



Charlie

--- In ap-gto@yahoogroups.com, Alan Pryor adpryor1953@...> wrote:

>

> I like your approach. .

> I use a laptop the is EnergyStar rated. .The battery on it last 6 hours, and I bring a spare. .I also have a laptop charger that comes directly off of a 12 volt battery. .No inverter is used.

> I personally like the 33 amp-hour deep cycle batteries. .They only weight about 25 pounds so they are not very hard on my back. .I do bring several of them. .One of them is just in case for the laptop or if one of the others drains too much, which never happens. .One is for the CCD. .One is for the dew heaters, and the other is for the mount. .Typically, I only use 3 batteries in one night.

> I do have a 65 amp-hour deep-cycle battery for an emergency, just in case I need more power or I need to run an inverter.

> I do have a 125 watt true sine wave inverter just in case I want to use my FLEA3 video camera for planetary photography. .In that case, I need 120 volts of true sine wave power as opposed to the modified sine wave that most inverters provide.

> Lastly, I have a 2000 watt Honda generator. .It is a EU2000i which produces clean true sine wave power for electronics. .It can also provide power for my hair dryer. .I have no hair, but I do like to knock dew off of something on occasion. .Additionally, I can use it to charge batteries. .Since I have two spare batteries so I can recharge day or night. .The generator is very quiet, so noise is not an issue. .Plus, the generator only weighs 50 pounds when fully fueled. .So it is very portable. .

> Alan

>

> --- On Sat, 8/20/11, charles.bradshaw cbradshaw1@...> wrote:

>

> From: charles.bradshaw cbradshaw1@...>

> Subject: [ap-gto] Re: 12V Power Distribution Question

> To: ap-gto@yahoogroups.com

> Date: Saturday, August 20, 2011, 12:37 PM

>

> I have the Honda 1000 watt generator and it is very quiet, but I yet to need it a a star party.. I take 3 batteries: a 117 AH deep-cycle marine battery, a Celestron 17 AH power tank, a B&D jump starter with a built in inverter.. The deep-cycle battery powers the mount, dew heaters etc., the Celestron powers the computer, and I use the B&D to inflate air mattresses and for charging my wife's iPod and as an emergency backup.

>

> The 117 AH battery can last 2 nights unles I've been slewing all over the sky.. The Celestron will last about 7 hours on a charge and my internal laptop battery another 4.. The B&D does not get enough use to need recharging over 3 days.

>

> However, there are caveats.. I don't use an inverter.. I have a DC-DC coupler for my laptop, which saves a lot of wasted power.. I also use direct 12VDC for my DSLRs and dew heaters.. Inverters are not very efficent.

>

> I use a $50 Shumacher battery charger to charge the Celestron and deep-cycle, 2 amps for the Celetron and 15 amps for the deep cycle, but it takes all day to charge both

>

> Hope this helps.

>

> Charlie

>

>

> --- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@> wrote:

> >

> > I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

> >

> > AP Mach 1 mount

> > SBIG ST2000XM camera

> > Laptop Computer

> > MoonLite Focuser

> > DC powered USB hub

> >

> > I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

> >

> > I would count on either battery to last for two nights without recharging and would then charge each one every other day.

> >

> > Does this sound like the optimum way to manage my power requirements? What issues might I run into?

> >

> > Thanks!

> >

>

>

>

>

---------------

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gtoYahoo! Groups Links

>

>

>

>

>

> [Non-text portions of this message have been removed]

>







----------------------------

#32864 Aug 21, 2011

I completed a 2-night simulation in my garage, running everything - taking darks, tracking on for the mount - running 10 hours Friday night and 11 hours Saturday night. The battery for the laptop was still at 12.1V and the battery for the mount/camera was still at 12V. I didn't do any charging between sessions. The 21 hours would be more like 3 nights of actual observing, so that along with having some ability to charge during the day, gives me some confidence that I'll be Ok at the Star Party.



Wayne

--- In ap-gto@yahoogroups.com, "lmbuck2000" lmbuck2000@...> wrote:

>

>

>

> do you have time to check this out in your back yard before heading out on the road?

>

> i find the laptop sucks the most power. i connect my laptop and camera (STL-11000) to a 75aH deep cycle AGM battery. it needs recharging in the morning. i connect guider, focuser, and mount (AP900) to a 33aH AGM battery. that too needs recharging -- it's not as run down as the bigger battery but no way i would expect it to last another night.

>

> and unless you are recharging at 7-8amps, i think you will find it takes ALL DAY (12+ hrs) to recharge those 75aH batteries. after limping through a 4 day outing recently, i ordered a bigger/better charger when i got back to reduce the charge time of the larger battery (www.batterystuff.com/battery-chargers/12-volt/gel-cell/BM12248.html).

>

> if your solar charging panels only put out a few amps, i don't think you will get your batteries recharged.

>

> consider taking a Honda eu2000 generator for recharging during the day... (not suggesting you run it at night... too annoying)

>

> Lee

>

> --- In ap-gto@yahoogroups.com, "Wayne" wayneh9026@> wrote:

> >

> > I have the following DC-powered equipment and 2 high capacity deep cycle batteries (A 75 AmpHour Marine battery and a 75 AH AGM Battery) to power them for four-five nights (assume 7 hours per night max). I do have a solar charger that can top off one battery during a day, given that the day is bright

> >

> > AP Mach 1 mount

> > SBIG ST2000XM camera

> > Laptop Computer

> > MoonLite Focuser

> > DC powered USB hub

> >

> > I know it is recommended to have separate power sources for both the mount and the camera, but that's not feasible. My tentative plan is to power the laptop off the marine battery and power the remaining equipment off the AGM battery going through the new Kendrick ePack 12 (www.kendrickastro.com/astro/battery.html).

> >

> > I would count on either battery to last for two nights without recharging and would then charge each one every other day.

> >

> > Does this sound like the optimum way to manage my power requirements? What issues might I run into?

> >

> > Thanks!

> >

>


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