#153262  by Mitzicanter
 Tue Jul 23, 2019 12:39 pm
Anyone recommend best deal for one of these? We have 2 x 110ah 12v batterys wired in parallel. Need one that can desulphate battery's that have run down a bit.
 #153264  by Nut17
 Tue Jul 23, 2019 12:53 pm
This is exceptionally good value at $380. https://www.cellpower.co.nz/shop/produc ... p-12-volt/
Alternatively you could go for the 20 Amp version for $280.
https://www.cellpower.co.nz/shop/produc ... p-12-volt/
Kevin at Cellpower has been in business for over 20 years and has a good reputation.
 #153277  by mattn
 Tue Jul 23, 2019 9:17 pm
I'll throw a spanner in the works - IMHO, if money is a concern, and you have a decent solar system looking after the batteries, all you need is amps - A bench power supply such as 13.8V power supply 20AMP for $100, 40Amp for $200 is adequate for the job.

A while back I did a spread sheet that showed charge time for batteries using a smart charge vs a dumb 13.8 supply (unfortunately I have lost it). Essentially it showed that in any real work world situation, bigger is better, the flatter the batteries are at the start, the more gain you get from big. It compared a 0.1C size smart charger to a 0.2C sized 13.8V power supply. (In your case with 200AH battery, 20Amp Smart vs 40AMP dumb) In any situation with the battery below 80% charge, the big charger was faster to get to 95%. The only time a smaller smart charger provided fast charging to more than 95% was starting from above 80% charged.

All this presumes a solar system with a good solar controller providing the smart charging that batteries need to finish them from the 95-98% charged to fully charged.
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