DC-DC charger as an alternative to generator?

gator70

Active member
Yes, this is what's making me lean towards alternator charging. Trying to keep things as simple as possible and with as little equipment as possible.

Just went out and started my truck and checked the voltage at idle. Seems to stay right around 14.4v.

Or generator, they are cheaper and output twice the charge
 

rruff

Explorer
TL;DR: Would like the ability to be "off grid" for at least 10 days and need the ability to keep batteries (2 x 100AH LiFePo4) at a reasonable SOC for that period.

ETA: Biggest draw is the 12v refrigerator/freezer.
Typically a fridge will use ~300Wh per day, but more if it's hot. Do you ever measure the energy you consume? I have a cheap monitor for this.

A LiFe 100A 12V battery will have at least 1200Wh of capacity, and draining them that low does not hurt them. IOW, there is no reason to charge them unless they are near empty. They weigh about 20 lbs, and I bought one recently with BT and cold temp cut off for $170 shipped. 3 of them should be enough to run your fridge for 10 days. Maybe add a 4th and call it good.

I'm just thinking that a DC-DC charger that you mainly only use while driving would be a good solution. Running your vehicle regularly when parked just to top off batteries, not so much. But having that as a fringe emergency measure would be fine.
 

Dave in AZ

Well-known member
one recently with BT and cold temp cut off for $170 shipped
Which was that, and do you recommend? I was about to buy one Will Prowse just tore apart and liked, WattCycle, but the day after his review price went from $207 to $250. Looking for a decent BT 100Ah mini. Thx
 

rruff

Explorer
I haven't tested it as a bought it right before a trip, and now that its all snug and cozy I probably never will. It is a mini and the BT works... although it doesn't seem to get the watts right. Supposed to be a JB BMS. I like having BT for trouble shooting bad cells.

It's even cheaper now, $160 shipped with coupon. Since Amazon links are wacky I won't try, but search for this.

Elefast 12V 100Ah Bluetooth LiFePO4 Lithium Battery

 

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