Hi folks!
I have a garmin 2730 gps, which does not have an internal battery. I have it wired direct to my motorcycle with a 1 amp fuse. I want to be able to use it in a restaurant or rest stop off the bike, using a small portable battery.
The gps is designed to run on 12v vehicle power, which is actually usually 13.8v.
From the gps I have garnered the following information:
usage: 12W max @ 13.8 v DC
12v DC 1.25A
With my primitive knowledge of these matters, I have imagined 2 scenerios:
1. 8- 1.5v AA or AAA batteries or 10- 1.2 v rechargable AA or AAA batteries
in series to a connector (sae type that I have on the gps) to the gps
-easy, 12 volts, but would need to locate and buy some sort of battery holder and a bit bulky
2. 2- 9v batteries in series to a plug to gps
-more compact, easier, already have the 9 volt battery connectors from old discarded radios-my problem is 2 - 9 v batteries are more than 12 v and I do not fully understand the implications of that. It is supposed to be 12v, but we already know they are expecting 13.8 v. What about 14.4v for 2 NiCd 9v batteries?
My questions:
-Do I need to step down the voltage on two 9 v batteries?
-How would I do that?
-Do I need the 1 amp fuse?
-Is there a better way of doing this?
-Am I going to ruin my $1000 gps?
-(less important) How long will these battery set ups last?
Thanks for your attention.
I have a garmin 2730 gps, which does not have an internal battery. I have it wired direct to my motorcycle with a 1 amp fuse. I want to be able to use it in a restaurant or rest stop off the bike, using a small portable battery.
The gps is designed to run on 12v vehicle power, which is actually usually 13.8v.
From the gps I have garnered the following information:
usage: 12W max @ 13.8 v DC
12v DC 1.25A
With my primitive knowledge of these matters, I have imagined 2 scenerios:
1. 8- 1.5v AA or AAA batteries or 10- 1.2 v rechargable AA or AAA batteries
in series to a connector (sae type that I have on the gps) to the gps
-easy, 12 volts, but would need to locate and buy some sort of battery holder and a bit bulky
2. 2- 9v batteries in series to a plug to gps
-more compact, easier, already have the 9 volt battery connectors from old discarded radios-my problem is 2 - 9 v batteries are more than 12 v and I do not fully understand the implications of that. It is supposed to be 12v, but we already know they are expecting 13.8 v. What about 14.4v for 2 NiCd 9v batteries?
My questions:
-Do I need to step down the voltage on two 9 v batteries?
-How would I do that?
-Do I need the 1 amp fuse?
-Is there a better way of doing this?
-Am I going to ruin my $1000 gps?
-(less important) How long will these battery set ups last?
Thanks for your attention.