The design I built (from a kit, into a standard Arlec 4A charger) doesn't activate the charger until it sees some voltage on the output (from the battery). I forget how it does that, but I recall it was quite a cleverly simple design. I have the schematic on paper somewhere.
Den 02/04/2016 kl. 18.57 skrev Glenn: ...
Please note that the a123systems starter battery has built-in BMS with among other Under-Voltage cutoff - but if you have some extra power drain plugged in your car - you should put yet another Under-Voltage cutoff that saves 1-30% of the starter battery capacity.
...
Quote: "... Smart on-board battery management system (BMS) electronics report real-time data and diagnostics to protect the battery and prevent premature failures, reducing service and warranty costs. The integrated BMS provides cell balancing and protection as well as built-in system-level safety features for under/over voltage cutoff, overcharge and over temperature protection. ..."
Oh - did I forgot to mention that LiFePO4 do not contain lead :-)
br,
Glenn
[snip]
Since I know battery charging temperature behavior rather well (see my patents), maybe I should just roll my own with 100mA capability ;-) ...Jim Thompson
OK...
In that case - make your own Bluetooth 4.x/BLE enabled OBD (
Then you can hook up your normal charger for some hours. (send email again when charged...)
Do you have many cars, since the car battery can happen to be totally discharged?
Glenn
Just two vehicles, an Infiniti Q45 and a Nissan Frontier Pick-em-up.
The car gets driven every day or three. The truck hasn't been driven since early December ;-) ...Jim Thompson
...
Please note that the charger tests your battery and signals if it is faulty - even when the battery is car connected. Lead-acid fails from time to time. The charger is reverse polarity protected [ idiot proof :-) ]:
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Please note: I have no shares in CTEK - yet...
Glenn
I think it's deliberate, so you can't hurt yourself by shorting the thing - lawyers, and all that. It can be quite annoying.
Automotive power is about the glitchiest power you can find. Car electronics is quite well protected.
That's not a feature, it's a bug.
Just go the solar panel route. My Moms car is a candidate, so I just ordered a 2.4W Schumacher. I'll see how that turns out, it's on the north side of the house and dosent get much sun in the winter so I might have to go back to running it once a month.
Cheers
I generally avoid anything that "smells leftist", but Arizona doesn't do daylight-savings because we have enough sun already... so maybe I'll try that out ;-) ...Jim Thompson
Well, that free 1 hour of sunlight dosen't do much up here.
;D
Cheers
Yeah, they left the "d" out of Aridzona.
Sorry, I'm a little late to the party. BatteryMINDer gets my vote.
Solar cell, 750 ma float charger (walmart), remove Xfmr from wal wart and connect SC same place. Works great. Keeps em topped off and no cooking.
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