dtbaker61
Well-Known Member
- First Name
- Dan
- Joined
- May 11, 2020
- Threads
- 104
- Messages
- 4,020
- Reaction score
- 3,699
- Location
- santa fe,nm
- Website
- www.envirokarma.org
- Vehicles
- MME (delivered 2/26/21), DIY eMiata BEV
- Occupation
- Solar Sales/install
...snip... Because the little battery is so little I wanted to install a dashcam battery in the car. Second problem is location. I've looked near and around the fuse box, and that's a no go. Under the passenger seat is too low. ... snip...
The MME 'senses' the LVB needing a charge at about 12.1 as far as I can tell... which wakes up the HV and charges up the LVB. The little LVB voltage sags pretty fast with any loads beyond the internal stuff in sleep mode. Gets pulled down just by the accessory lights when you open the doors !
You could either add capacity, or leave the MME 'on'.
Adding battery capacity may mess up the calculations on when your LVB needs to be replaced, but I can't think of any other harm it would do.
There is a pretty big hole under the existing little battery, towards the firewall. I'd guess that if you fabricate a little tray or bracket for it to sit on, you can fit a second AGM battery under there and put it in parallel. you'll have to pull the Frunk bucket to get access...
Once in parallel, the MME *should* maintain it. The extra capacity *may* get you thru the night.
An alternative would be to leave the MME 'on' ALL the time, and turn off the auto-off setting. This gives you full time voltage support from the HV and hold it at 13v+, and you wouldn't have to add anything, but it would drain the HV more than if you let it sleep. Especially if you leave the cabin temperature 'on'. It will also double-honk when you leave and take your phone with you to remind you left it running.
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