|My Tiny Battery Drawer|
I seldom use more than 80ah in a given day/night cycle so I was mostly alright. More would be better! I am looking into the new technology Lithium Phosphate batteries to create much larger storage "tank" for my use. Around 400ah total that you can discharge down to 20% remaining giving me 320ah total! This is NOT ready for prime time. They are REALLY expensive (around $2100 for 400ah).
|Battery Master Switch (OFF/1/ALL/2) - On Right|
|Typical 5 Amp "Power Theft" Device|
|MosFET Battery Isolator|
***WARNING!! - I've Been receiving conflicting information about using multiple deep cycles to start an engine. TRY THIS AT YOUR OWN RISK!!!***
After testing the max draw from the two deep cycles in my RV. (I disconnected my engine battery first) I've determined for my 5.9L (360 cu. in) V8 I draw less than 50 Amps! It actually read 35 Amps, but I has some power coming in from the panels ~6amps or so. The manufacturer gives these deep cycles a CCA (Cold Cranking Amp) rating so they CAN be used as start batteries. The <25 Amp, per battery, draw I am using for 3-5 seconds falls well within the specs for these batteries. My inverter can use significantly more than this! I believe we are safe. When I add in the third (or even fourth) battery, the draw per battery goes down even further. If you are nervous, let me test it for the rest of the season and I'll report on the condition of my batteries at that time. Now where am I going to find a used 27 TMX battery or 2????
Now for the down sides. If you leave your battery systems connected together, you could deplete them enough that you couldn't start you main engine and perhaps even your generator. This is bad. I am very mindful of my state of charge, and even have low voltage alarms in place to stop that from happening. I also carry a "jumper box" which is simply a sealed lead acid battery in a plastic box with attached jumper cables. That's a last resort.
I am looking into setting up a way to have the batteries charge 2 at a time. And then, get used 2 at a time. Yes, I could do this with a switch, but I'd like it to be automatic. I found that several charge controllers will provide this, but of course, it's not the one I already have! I know it's all pretty confusing, but there is a good solution. Could this be the stop-gap measure until the Lithium Phosphate batteries are ready for prim-time?
More info on this as I work through the details. Stay Tuned!
Be Seeing You...Down The Road,
Rich "The Wanderman"