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Re: Just purchased GM811GHD

 

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All of my astro efforts are done at sites several hours drive away. I have used agm and gel cell batts for running computers mount and cameras. A 79 AH agm has worked well except in cold weather for about 2 nights of imaging with guiding. I recently replaced that with a 50 Ah LiFePO4 batt and found I could go 3 nights on the same setup. At about half the weight, my back has thanked me a lot. My wallet on the other hand is still whining?. I plan to swap out 2 gells (32AH) and another 79 AH agm with more LiFePO4s as the existing batts age and the LiFePO4 batt prices drop. Cheers?
Loren

On Dec 8, 2017, at 11:52, crocco1250 crocco1250@... [Losmandy_users] <Losmandy_users@...> wrote:

?

On power, you might consider using a lithium iron phosphate battery.? It is tolerant of temp unlike lithium batteries but is not cheap.? But it is lighter and, with purchased battery charger, you can use it at home plugged in.? You just add cig lighter jack and fuse and away you go.


Chuck



Sent from my Samsung Galaxy Tab?|PRO


-------- Original message --------
From: "bvalente@... [Losmandy_users]" <Losmandy_users@...>
Date: 12/08/2017 11:33 AM (GMT-08:00)
To: Losmandy_users@...
Subject: [Losmandy_users] Re: Just purchased GM811GHD

?

yes, they will definitely work.?


Car starter batteries are more designed around offering a maximum amperage to kick over the motor.?

for astro that's not important -? instead we want greater battery capacity, hence amp-hours

if your losmandy pulls .5a then a 22 amp-hour will last about 11 hours, or pretty much all night long


me, I power my losmandy G11T, intel nuc i5 computer, focuser, dew heater, camera, guide camera, and whatever USB junk is connected to my computer. so my amp-hour usage is a lot more.

just FYI


B
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