Ac to dc charger which one? 272ah batteries

Hello everyone while I wait for my 272ah batteries to arrive I need to purchase a charger. I am building a 12 volt battery for my trolling motor on my boat and it will not be used every day maybe a couple times a month. I need an ac to dc charger I think i have narrowed it down to two chargers.
Number one is

Powermax PM4 55A 110V AC to 12V DC 55 Amp Power Converter with Built-in 4 Stage Smart Battery Charger​

This looks good

• Bulk Charge: 14.4 V
• Absorption Charge: 13.6 V
• Float Charge: 13.2 V

The float charge seems low at 13.2 I don’t know what problems I will have with that but it seems a few people on the forum use it without problems.
Number two is

Victron Energy Blue Smart IP67 12/24-Volt 5-25 amp Battery Charger (Bluetooth)​

This one looks better, seems I would be able to adjust the charge settings but it’s only 25 amp. Is 25 amps enough for 280ah batteries? Iam not worried about the longer charge times just don’t know if it’s to little amps.
Thanks for your help.

Either will work. 25A is not too low.

Isn't one of the stages of a four stage charger a desulfation stage? You wouldn't want that with a LiFePO4 battery.

I can't find much about that PM4. Also no charge curve, so it's hard to say how they handle LiFePO4.

If they do have a desulfation stage which can't be disabled, than for shure that one is one to skip.

The Victron will do, with the app you can fully customize them (if the default Lithium profile doesn't suit your needs)

25A for 280Ah is fine, it only takes longer to fully charge them (10+ hours in worst case if fully discharged). I

You can also look into the Meanwell PB-360. ( https://www.meanwell.com/Upload/PDF/PB-360/PB-360-SPEC.PDF )
Also 25 amps (24.2 to be exactly) but cheaper.
There is also a PB-600, which does 40A or so.

They are not as sophisticated as a Victron, but also a lot cheaper, and will do the job just as fine. You can also adjust the voltages as per wills recommended settings if you accept slightly longer charging times and slightly less capacity, but prefer a longer life

HRTKD said:

Isn't one of the stages of a four stage charger a desulfation stage? You wouldn't want that with a LiFePO4 battery.

Click to expand...

No. The PM4 just has an extra bulk cycle every 24 hours. That's the difference between the PM3 and the PM4. I have both.

My ctek pro25s with lithium mode works fine but maybe not available ( or very expensive) in US. It is not cheap in Sweden either.( 300$ in todays currensy)..But so far ( as all the versions i have had for lead acid) works nicly and in the case of lead acid keeps them going. Lifepo4 , well had battery for 1 year and mostly charged vid ctek d250se ( dc/dc)

This is the charger I'm looking at. https://www.amazon.com/dp/B07N1K43NQ/ref=cm_sw_r_cp_apa_i_BPZYHFYYA9616SSKAW5Y?_encoding=UTF8&psc=1

AIMS Power CON120AC1224DC AC Converter & Battery 12V or 24V Smart Charger 75 amps Listed to UL 458 & C​

Lucky360 said:

Powermax PM4 55A 110V AC to 12V DC 55 Amp Power Converter with Built-in 4 Stage Smart Battery Charger​

This looks good

• Bulk Charge: 14.4 V
• Absorption Charge: 13.6 V
• Float Charge: 13.2 V

The float charge seems low at 13.2 I don’t know what problems I will have with that but it seems a few people on the forum use it without problems.

Click to expand...

Bulk stage is only ~30 minutes so unless your battery is at a fairly high state of charge it doesn't really mean anything.
Absorption stage is ~12 hours.
Its good to have the float low, that way your battery gets to cycle.